Results for "Danica Kragic"

total 96took 0.18s
Anticipating many futures: Online human motion prediction and synthesis for human-robot collaborationFeb 27 2017Fluent and safe interactions of humans and robots require both partners to anticipate the others' actions. A common approach to human intention inference is to model specific trajectories towards known goals with supervised classifiers. However, these ... More
A Probabilistic Semi-Supervised Approach to Multi-Task Human Activity ModelingSep 24 2018Mar 14 2019Human behavior is a continuous stochastic spatio-temporal process which is governed by semantic actions and affordances as well as latent factors. Therefore, video-based human activity modeling is concerned with a number of tasks such as inferring current ... More
VPE: Variational Policy Embedding for Transfer Reinforcement LearningSep 10 2018Sep 14 2018Reinforcement Learning methods are capable of solving complex problems, but resulting policies might perform poorly in environments that are even slightly different. In robotics especially, training and deployment conditions often vary and data collection ... More
Dual-Arm In-Hand Manipulation and Regrasping Using Dexterous Manipulation GraphsApr 25 2019May 16 2019This work focuses on the problem of in-hand manipulation and regrasping of objects with parallel grippers. We propose Dexterous Manipulation Graph (DMG) as a representation on which we define planning for in-hand manipulation and regrasping. The DMG is ... More
Deep Predictive Policy Training using Reinforcement LearningMar 02 2017Skilled robot task learning is best implemented by predictive action policies due to the inherent latency of sensorimotor processes. However, training such predictive policies is challenging as it involves finding a trajectory of motor activations for ... More
Data-Driven Grasp Synthesis - A SurveySep 10 2013Apr 14 2016We review the work on data-driven grasp synthesis and the methodologies for sampling and ranking candidate grasps. We divide the approaches into three groups based on whether they synthesize grasps for known, familiar or unknown objects. This structure ... More
Reinforcement Learning for Pivoting TaskMar 01 2017In this work we propose an approach to learn a robust policy for solving the pivoting task. Recently, several model-free continuous control algorithms were shown to learn successful policies without prior knowledge of the dynamics of the task. However, ... More
Feature Descriptors for Tracking by Detection: a BenchmarkJul 21 2016In this paper, we provide an extensive evaluation of the performance of local descriptors for tracking applications. Many different descriptors have been proposed in the literature for a wide range of application in computer vision such as object recognition ... More
A Decomposition-Based Approach to Reasoning about Free Space Path-Connectivity for Rigid Objects in 2DOct 27 2017In this paper, we compute a conservative approximation of the path-connected components of the free space of a rigid object in a 2D workspace in order to solve two closely related problems: to determine whether there exists a collision-free path between ... More
Global Search with Bernoulli Alternation Kernel for Task-oriented Grasping Informed by SimulationOct 10 2018We develop an approach that benefits from large simulated datasets and takes full advantage of the limited online data that is most relevant. We propose a variant of Bayesian optimization that alternates between using informed and uninformed kernels. ... More
Bayesian Optimization in Variational Latent Spaces with Dynamic CompressionJul 10 2019Data-efficiency is crucial for autonomous robots to adapt to new tasks and environments. In this work we focus on robotics problems with a budget of only 10-20 trials. This is a very challenging setting even for data-efficient approaches like Bayesian ... More
Data-Driven Model Predictive Control for Food-CuttingMar 09 2019Modelling of contact-rich tasks is challenging and cannot be entirely solved using classical control approaches due to the difficulty of constructing an analytic description of the contact dynamics. Additionally, in a manipulation task like food-cutting, ... More
Object Placement Planning and Optimization for Robot ManipulatorsJul 04 2019We address the problem of motion planning for a robotic manipulator with the task to place a grasped object in a cluttered environment. In this task, we need to locate a collision-free pose for the object that a) facilitates the stable placement of the ... More
A Comparison of Visualisation Methods for Disambiguating Verbal Requests in Human-Robot InteractionJan 26 2018Picking up objects requested by a human user is a common task in human-robot interaction. When multiple objects match the user's verbal description, the robot needs to clarify which object the user is referring to before executing the action. Previous ... More
Learning Manipulation States and Actions for Efficient Non-prehensile Rearrangement PlanningJan 11 2019This paper addresses non-prehensile rearrangement planning problems where a robot is tasked to rearrange objects among obstacles on a planar surface. We present an efficient planning algorithm that is designed to impose few assumptions on the robot's ... More
Interactive Perception: Leveraging Action in Perception and Perception in ActionApr 13 2016Recent approaches in robotics follow the insight that perception is facilitated by interactivity with the environment. These approaches are subsumed under the term of Interactive Perception (IP). We argue that IP provides the following benefits: (i) any ... More
Interactive Perception: Leveraging Action in Perception and Perception in ActionApr 13 2016Dec 06 2017Recent approaches in robotics follow the insight that perception is facilitated by interaction with the environment. These approaches are subsumed under the term of Interactive Perception (IP). It provides the following benefits: (i) interaction with ... More
Detect, anticipate and generate: Semi-supervised recurrent latent variable models for human activity modelingSep 19 2018Successful Human-Robot collaboration requires a predictive model of human behavior. The robot needs to be able to recognize current goals and actions and to predict future activities in a given context. However, the spatio-temporal sequence of human actions ... More
Human-Robot Collaboration: From Psychology to Social RoboticsMay 29 2017With the advances in robotic technology, research in human-robot collaboration (HRC) has gained in importance. For robots to interact with humans autonomously they need active decision making that takes human partners into account. However, state-of-the-art ... More
Reinforcement Learning in Topology-based Representation for Human Body Movement with Whole Arm ManipulationSep 12 2018Moving a human body or a large and bulky object can require the strength of whole arm manipulation (WAM). This type of manipulation places the load on the robot's arms and relies on global properties of the interaction to succeed---rather than local contacts ... More
Estimating Tactile Data for Adaptive Grasping of Novel ObjectsApr 09 2017Apr 19 2017We present an adaptive grasping method that finds stable grasps on novel objects. The main contributions of this paper is in the computation of the probability of success of grasps in the vicinity of an already applied grasp. Our method performs grasp ... More
Learning to Estimate Pose and Shape of Hand-Held Objects from RGB ImagesMar 08 2019We develop a system for modeling hand-object interactions in 3D from RGB images that show a hand which is holding a novel object from a known category. We design a Convolutional Neural Network (CNN) for Hand-held Object Pose and Shape estimation called ... More
Exploring Temporal Dependencies in Multimodal Referring Expressions with Mixed RealityFeb 04 2019In collaborative tasks, people rely both on verbal and non-verbal cues simultaneously to communicate with each other. For human-robot interaction to run smoothly and naturally, a robot should be equipped with the ability to robustly disambiguate referring ... More
Invariant Feature Mappings for Generalizing Affordance Understanding Using Regularized Metric LearningJan 30 2019This paper presents an approach for learning invariant features for object affordance understanding. One of the major problems for a robotic agent acquiring a deeper understanding of affordances is finding sensory-grounded semantics. Being able to understand ... More
Dexterous Manipulation GraphsMar 01 2018We propose the Dexterous Manipulation Graph as a tool to address in-hand manipulation and reposition an object inside a robot's end-effector. This graph is used to plan a sequence of manipulation primitives so to bring the object to the desired end pose. ... More
Dual-Arm In-Hand Manipulation and Regrasping Using Dexterous Manipulation GraphsApr 25 2019This work focuses on the problem of in-hand manipulation and regrasping of objects with parallel grippers. We propose Dexterous Manipulation Graph (DMG) as a representation on which we define planning for in-hand manipulation and regrasping. The DMG is ... More
Deep representation learning for human motion prediction and classificationFeb 24 2017Apr 13 2017Generative models of 3D human motion are often restricted to a small number of activities and can therefore not generalize well to novel movements or applications. In this work we propose a deep learning framework for human motion capture data that learns ... More
Self-learning and adaptation in a sensorimotor frameworkJan 05 2016We present a general framework to autonomously achieve a task, where autonomy is acquired by learning sensorimotor patterns of a robot, while it is interacting with its environment. To accomplish the task, using the learned sensorimotor contingencies, ... More
A Sensorimotor Reinforcement Learning Framework for Physical Human-Robot InteractionJul 27 2016Modeling of physical human-robot collaborations is generally a challenging problem due to the unpredictive nature of human behavior. To address this issue, we present a data-efficient reinforcement learning framework which enables a robot to learn how ... More
Active Perception and Modeling of Deformable Surfaces using Gaussian Processes and Position-based DynamicsFeb 13 2018Exploring and modeling heterogeneous elastic surfaces requires multiple interactions with the environment and a complex selection of physical material parameters. The most common approaches model deformable properties from sets of offline observations ... More
Active Exploration Using Gaussian Random Fields and Gaussian Process Implicit SurfacesFeb 13 2018In this work we study the problem of exploring surfaces and building compact 3D representations of the environment surrounding a robot through active perception. We propose an online probabilistic framework that merges visual and tactile measurements ... More
Vanishing viscosity limit for the compressible Navier-Stokes system via measure-valued solutionsMar 14 2019We identify a class of measure-valued solutions of the barotropic Euler system on a general (un-bounded) spatial domain as a vanishing viscosity limit for the compressible Navier-Stokes system. Then we establish the weak (measure-valued)-strong uniqueness ... More
Rearrangement with Nonprehensile Manipulation Using Deep Reinforcement LearningMar 15 2018Rearranging objects on a tabletop surface by means of nonprehensile manipulation is a task which requires skillful interaction with the physical world. Usually, this is achieved by precisely modeling physical properties of the objects, robot, and the ... More
CapriDB - Capture, Print, Innovate: A Low-Cost Pipeline and Database for Reproducible Manipulation ResearchOct 17 2016We present a novel approach and database which combines the inexpensive generation of 3D object models via monocular or RGB-D camera images with 3D printing and a state of the art object tracking algorithm. Unlike recent efforts towards the creation of ... More
Optimising Parameters in Recurrence Quantification Analysis of Smart Energy SystemsJul 08 2018Recurrence Quantification Analysis (RQA) can help to detect significant events and phase transitions of a dynamical system, but choosing a suitable set of parameters is crucial for the success. From recurrence plots different RQA variables can be obtained ... More
Green neighbourhoods in low voltage networks: measuring impact of electric vehicles and photovoltaics on load profilesJun 24 2016In the near future various types of low-carbon technologies (LCTs) are expected to be widely employed throughout the United Kingdom. However, the effect that these technologies will have at a household level on the existing low voltage (LV) network is ... More
Energy Disaggregation for SMEs using Recurrence Quantification AnalysisFeb 28 2018Energy disaggregation determines the energy consumption of individual appliances from the total demand signal, which is recorded using a single monitoring device. There are varied approaches to this problem, which are applied to different settings. Here, ... More
Singular knot bundle in lightJul 24 2018As the size of an optical vortex knot, imprinted in a coherent light beam, is decreased, nonparaxial effects alter the structure of the knotted optical singularity. For knot structures approaching the scale of wavelength, longitudinal polarization effects ... More
Properties of the electronic fluid of superconducting cuprates from $^{63}$Cu NMR shift and relaxationJun 10 2018Jul 03 2018We use available $^{63}$Cu nuclear magnetic resonance (NMR) data of the high-temperature superconducting cuprates and show that one must resort to a coupled electronic spin scenario that leads to a suppression of the shifts, except for a few heavily overdoped ... More
Reconciling the Bayes Factor and Likelihood Ratio for Two Non-Nested Model Selection ProblemsJan 28 2019In statistics, there are a variety of methods for performing model selection that all stem from slightly different paradigms of statistical inference. The reasons for choosing one particular method over another seem to be based entirely on philosophical ... More
Chemical Self-Enrichment of HII Regions by the Wolf-Rayet Phase of an 85 Msun starMar 08 2006It is clear from stellar evolution and from observations of WR stars that massive stars are releasing metal-enriched gas through their stellar winds in the Wolf-Rayet phase. Although HII region spectra serve as diagnostics to determine the present-day ... More
The lattice of congruence lattices of algebras on a finite setDec 21 2016Feb 23 2017The congruence lattices of all algebras defined on a fixed finite set $A$ ordered by inclusion form a finite atomistic lattice $\mathcal E$. We describe the atoms and coatoms. Each meet-irreducible element of $\mathcal E$ being determined by a single ... More
The observable Metal-enrichment of Radiation-driven+Wind-blown HII Regions in the Wolf-Rayet StageFeb 11 2007From stellar evolution models and from observations of Wolf-Rayet stars it is known that massive stars are releasing metal-enriched gas in their Wolf-Rayet phase by means of strong stellar winds. Although HII region spectra serve as diagnostics to determine ... More
Algorithms for alpha-rate domination problems on weighted graphsApr 26 2016In this article, we investigate a domination set problem variant on vertex-weighted graphs. In the last few years, several algorithms have been presented for solving the minimum alpha and alpha-rate domination problem (also known as the positive influence ... More
Oscillations in the wake of a flare blast waveFeb 15 2011Oscillations of coronal loops in the Sun have been reported in both imaging and spectral observations at the onset of flares. Images reveal transverse oscillations, whereas spectra detect line-of-sight velocity or Doppler-shift oscillations. The Doppler-shift ... More
Properties of the electronic fluid of superconducting cuprates from $^{63}$Cu NMR shift and relaxationJun 10 2018Mar 05 2019Nuclear magnetic resonance (NMR) provides local, bulk information about the electronic properties of materials, and it has been influential for theory of high-temperature superconducting cuprates. Importantly, NMR found early that nuclear relaxation is ... More
In the mood: the dynamics of collective sentiments on TwitterApr 11 2016We study the relationship between the sentiment levels of Twitter users and the evolving network structure that the users created by @-mentioning each other. We use a large dataset of tweets to which we apply three sentiment scoring algorithms, including ... More
Aggregate Hazes in Exoplanet AtmospheresFeb 14 2019Photochemical hazes have been frequently used to interpret exoplanet transmission spectra that show an upward slope towards shorter wavelengths and weak molecular features. While previous studies have only considered spherical haze particles, photochemical ... More
Internal chemo-dynamical Modeling of Gas Exchange within Galaxies and with their EnvironmentSep 05 2007By a few but important examples as models of combined radiative and wind-driven HII regions and galactic winds we demonstrate the importance of refined small-to-medium scale studies of chemo-dynamical effects. These processes determine the internal dynamics ... More
Text Mining Customer Reviews For Aspect-based Restaurant RatingJan 07 2019This study applies text mining to analyze customer reviews and automatically assign a collective restaurant star rating based on five predetermined aspects: ambiance, cost, food, hygiene, and service. The application provides a web and mobile crowd sourcing ... More
Neural Networks in Mobile Robot MotionDec 11 2004This paper deals with a path planning and intelligent control of an autonomous robot which should move safely in partially structured environment. This environment may involve any number of obstacles of arbitrary shape and size; some of them are allowed ... More
A Note on the Specific Source Identification Problem in Forensic Science in the Presence of Uncertainty about the Background PopulationMar 27 2015A goal in the forensic interpretation of scientific evidence is to make an inference about the source of a trace of unknown origin. The evidence is composed of the following three elements: (a) the trace of unknown origin, (b) a sample from a specific ... More
Discovery of new planetary nebulae in the Small Magellanic CloudMar 23 2016We present six new planetary nebulae (PNe) discovered in the Small Magellanic Cloud (SMC) from deep UK Schmidt telescope (UKST) narrow band Halpha and broad-band short-red "SR" continuum images and confirmed spectroscopically. These 6 preliminary discoveries ... More
Four New Planetary Nebulae Toward the Small Magellanic CloudJun 24 2015Jun 25 2015We present four new planetary nebulae (PNe) discovered in the Small Magellanic Cloud (SMC) from deep UK Schmidt telescope (UKST) narrow band H-alpha and broad-band short-red "SR" continuum images and confirmed spectroscopically. All new PNe show strong ... More
Giga-z: A 100,000 Object Superconducting Spectrophotometer for LSST Follow-upJul 18 2013We simulate the performance of a new type of instrument, a Superconducting Multi-Object Spectrograph (SuperMOS), that uses Microwave Kinetic Inductance Detectors (MKIDs). MKIDs, a new detector technology, feature good QE in the UVOIR, can count individual ... More
Phenomenology of $^{63}$Cu nuclear relaxation in cuprate superconductorsFeb 27 2019Apr 27 2019Nuclear relaxation is an important thermodynamic probe of electronic excitations, in particular in conducting and superconducting systems. Here, an empirical phenomenology based on all available literature data for planar Cu in hole-doped cuprates is ... More
Phenomenology of $^{63}$Cu nuclear relaxation in cuprate superconductorsFeb 27 2019Nuclear relaxation is an important thermodynamic probe of electronic excitations, in particular in conducting and superconducting systems. Here, an empirical phenomenology based on all available literature data for planar Cu in hole-doped cuprates is ... More
Determining the Veracity of Rumours on TwitterNov 19 2016While social networks can provide an ideal platform for up-to-date information from individuals across the world, it has also proved to be a place where rumours fester and accidental or deliberate misinformation often emerges. In this article, we aim ... More
An innovation diffusion model of a local electricity network that is influenced by internal and external factorsMar 17 2017Haynes et al. (1977) derived a nonlinear differential equation to determine the spread of innovations within a social network across space and time. This model depends upon the imitators and the innovators within the social system, where the imitators ... More
Efficient Calculation of Energy Spectra Using Path IntegralsDec 27 2006A newly developed method for systematically improving the convergence of path integrals for transition amplitudes, introduced in Phys. Rev. Lett. 94 (2005) 180403, Phys. Rev. B 72 (2005) 064302, Phys. Lett. A 344 (2005) 84, and expectation values, introduced ... More
Electrochemical tuning of capacitive response of graphene oxideMay 31 2018Jul 25 2018Increasing energy demands of modern society requires deep understanding of the properties of energy storage materials as well as their performance tuning. We show that the capacitance of graphene oxide (GO) can be precisely tuned using a simple electrochemical ... More
Radio Planetary Nebulae in the Small Magellanic CloudFeb 11 2016We present ten new radio continuum (RC) detections at catalogued planetary nebula (PN) positions in the Small Magellanic Cloud (SMC): SMPS6, LIN 41, LIN 142, SMP S13, SMP S14, SMP S16, J18, SMP S18, SMP S19 and SMP S22. Additionally, six SMC radio PNe ... More
Memory and burstiness in dynamic networksJan 21 2015Jul 06 2015A discrete-time random process is described which can generate bursty sequences of events. A Bernoulli process, where the probability of an event occurring at time $t$ is given by a fixed probability $x$, is modified to include a memory effect where the ... More
Radio-Continuum study of the Nearby Sculptor Group Galaxies. Part 1: NGC 300 at lambda = 20 cmMar 08 2012Mar 11 2012A series of new radio-continuum (lambda=20 cm) mosaic images focused on the NGC 300 galactic system were produced using archived observational data from the VLA and/or ATCA. These new images are both very sensitive (rms=60 microJy) and feature high angular ... More
OLTP on Hardware IslandsAug 01 2012Modern hardware is abundantly parallel and increasingly heterogeneous. The numerous processing cores have non-uniform access latencies to the main memory and to the processor caches, which causes variability in the communication costs. Unfortunately, ... More
SPEEDUP Code for Calculation of Transition Amplitudes via the Effective Action ApproachMay 03 2011We present Path Integral Monte Carlo C code for calculation of quantum mechanical transition amplitudes for 1D models. The SPEEDUP C code is based on the use of higher-order short-time effective actions and implemented to the maximal order $p$=18 in the ... More
The Atacama Cosmology Telescope: Dynamical masses for 44 SZ-selected galaxy clusters over 755 square degreesDec 03 2015May 26 2016We present galaxy velocity dispersions and dynamical mass estimates for 44 galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect by the Atacama Cosmology Telescope. Dynamical masses for 18 clusters are reported here for the first time. Using ... More
The Atacama Cosmology Telescope: Dusty Star-Forming Galaxies and Active Galactic Nuclei in the Southern SurveyJun 10 2013Mar 10 2014We present a catalog of 191 extragalactic sources detected by the Atacama Cosmology Telescope (ACT) at 148 GHz and/or 218 GHz in the 2008 Southern survey. Flux densities span 14-1700 mJy, and we use source spectral indices derived using ACT-only data ... More
Subaru weak-lensing measurement of a z = 0.81 cluster discovered by the Atacama Cosmology Telescope SurveySep 20 2012We present a Subaru weak lensing measurement of ACT-CL J0022.2-0036, one of the most luminous, high-redshift (z=0.81) Sunyaev-Zel'dovich (SZ) clusters discovered in the 268 deg^2 equatorial region survey of the Atacama Cosmology Telescope. For the weak ... More
The Atacama Cosmology Telescope: the stellar content of galaxy clusters selected using the Sunyaev-Zel'dovich effectJan 04 2013Aug 22 2013We present a first measurement of the stellar mass component of galaxy clusters selected via the Sunyaev-Zel'dovich (SZ) effect, using 3.6 um and 4.5 um photometry from the Spitzer Space Telescope. Our sample consists of 14 clusters detected by the Atacama ... More
The Atacama Cosmology Telescope: Cross-Correlation of CMB Lensing and QuasarsJul 19 2012Nov 17 2012We measure the cross-correlation of Atacama Cosmology Telescope CMB lensing convergence maps with quasar maps made from the Sloan Digital Sky Survey DR8 SDSS-XDQSO photometric catalog. The CMB lensing-quasar cross-power spectrum is detected for the first ... More
The Atacama Cosmology Telescope: ACT-CL J0102-4915 "El Gordo," a Massive Merging Cluster at Redshift 0.87Sep 05 2011Jan 08 2012We present a detailed analysis from new multi-wavelength observations of the exceptional galaxy cluster ACT-CL J0102-4915 "El Gordo," likely the most massive, hottest, most X-ray luminous and brightest Sunyaev-Zeldovich (SZ) effect cluster known at z>0.6. ... More
The Atacama Cosmology Telescope: Physical Properties of Sunyaev-Zel'dovich Effect Clusters on the Celestial EquatorOct 15 2012Jan 08 2013We present the optical and X-ray properties of 68 galaxy clusters selected via the Sunyaev-Zel'dovich Effect at 148 GHz by the Atacama Cosmology Telescope (ACT). Our sample, from an area of 504 square degrees centered on the celestial equator, is divided ... More
Atacama Cosmology Telescope: Dusty star-forming galaxies and active galactic nuclei in the equatorial surveyMay 11 2019We present a catalog of 510 radio-loud active galactic nuclei (AGN, primarily blazars) and 287 dusty star-forming galaxies (DSFGs) detected by the Atacama Cosmology Telescope at $> 5 \sigma$ significance in frequency bands centered on 148 GHz (2 mm), ... More
The Atacama Cosmology Telescope: Beam Measurements and the Microwave Brightness Temperatures of Uranus and SaturnMar 19 2013We describe the measurement of the beam profiles and window functions for the Atacama Cosmology Telescope (ACT), which operated from 2007 to 2010 with kilo-pixel bolometer arrays centered at 148, 218, and 277 GHz. Maps of Saturn are used to measure the ... More
Detection of the Power Spectrum of Cosmic Microwave Background Lensing by the Atacama Cosmology TelescopeMar 10 2011Jul 27 2011We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by calculating ... More
The Atacama Cosmology Telescope: High-Resolution Sunyaev-Zel'dovich Array Observations of ACT SZE-selected Clusters from the Equatorial StripAug 16 2011We present follow-up observations with the Sunyaev-Zel'dovich Array (SZA) of optically-confirmed galaxy clusters found in the equatorial survey region of the Atacama Cosmology Telescope (ACT): ACT-CL J0022-0036, ACT-CL J2051+0057, and ACT-CL J2337+0016. ... More
The Atacama Cosmology Telescope: Detection of Sunyaev-Zel'dovich Decrement in Groups and Clusters Associated with Luminous Red GalaxiesJan 10 2011Jan 19 2012We present a detection of the Sunyaev-Zel'dovich (SZ) decrement associated with the Luminous Red Galaxy (LRG) sample of the Sloan Digital Sky Survey. The SZ data come from 148 GHz maps of the equatorial region made by the Atacama Cosmology Telescope (ACT). ... More
A Measurement of the Millimeter Emission and the Sunyaev-Zel'dovich Effect Associated with Low-Frequency Radio SourcesOct 30 2013Oct 23 2014We present a statistical analysis of the millimeter-wavelength properties of 1.4 GHz-selected sources and a detection of the Sunyaev-Zel'dovich (SZ) effect associated with the halos that host them. The Atacama Cosmology Telescope (ACT) has conducted a ... More
The Atacama Cosmology Telescope: A Measurement of the Thermal Sunyaev-Zel'dovich One-Point PDFNov 28 2014We present a measurement of the one-point probability distribution function (PDF) of the thermal Sunyaev-Zel'dovich (tSZ) decrement in the pixel temperature histogram of filtered 148 GHz sky maps from the Atacama Cosmology Telescope (ACT). The PDF includes ... More
The Atacama Cosmology Telescope: Temperature and Gravitational Lensing Power Spectrum Measurements from Three Seasons of DataJan 06 2013Feb 02 2013We present the temperature power spectra of the cosmic microwave background (CMB) derived from the three seasons of data from the Atacama Cosmology Telescope (ACT) at 148 GHz and 218 GHz, as well as the cross-frequency spectrum between the two channels. ... More
The Atacama Cosmology Telescope: Sunyaev-Zel'dovich Selected Galaxy Clusters at 148 GHz from Three Seasons of DataJan 04 2013Jul 08 2013[Abridged] We present a catalog of 68 galaxy clusters, of which 19 are new discoveries, detected via the Sunyaev-Zel'dovich effect (SZ) at 148 GHz in the Atacama Cosmology Telescope (ACT) survey of 504 square degrees on the celestial equator. A subsample ... More
The Atacama Cosmology Telescope: Dynamical Masses and Scaling Relations for a Sample of Massive Sunyaev-Zel'dovich Effect Selected Galaxy ClustersJan 04 2012Jun 13 2013We present the first dynamical mass estimates and scaling relations for a sample of Sunyaev-Zel'dovich effect (SZE) selected galaxy clusters. The sample consists of 16 massive clusters detected with the Atacama Cosmology Telescope (ACT) over a 455 sq. ... More
Correlations in the (Sub)millimeter background from ACTxBLASTJan 07 2011We present measurements of the auto- and cross-frequency correlation power spectra of the cosmic (sub)millimeter background at: 250, 350, and 500 um (1200, 860, and 600 GHz) from observations made with the Balloon-borne Large Aperture Submillimeter Telescope, ... More
The Atacama Cosmology Telescope: a measurement of the primordial power spectrumMay 24 2011We present constraints on the primordial power spectrum of adiabatic fluctuations using data from the 2008 Southern Survey of the Atacama Cosmology Telescope (ACT). The angular resolution of ACT provides sensitivity to scales beyond \ell = 1000 for resolution ... More
Evidence for dark energy from the cosmic microwave background alone using the Atacama Cosmology Telescope lensing measurementsMay 02 2011Aug 01 2011For the first time, measurements of the cosmic microwave background radiation (CMB) alone favor cosmologies with $w=-1$ dark energy over models without dark energy at a 3.2-sigma level. We demonstrate this by combining the CMB lensing deflection power ... More
The Atacama Cosmology Telescope: A Measurement of the Thermal Sunyaev-Zel'dovich Effect Using the Skewness of the CMB Temperature DistributionMar 29 2012Nov 20 2012We present a detection of the unnormalized skewness <T^3> induced by the thermal Sunyaev-Zel'dovich (tSZ) effect in filtered Atacama Cosmology Telescope (ACT) 148 GHz cosmic microwave background temperature maps. Contamination due to infrared and radio ... More
The Atacama Cosmology Telescope: Relation Between Galaxy Cluster Optical Richness and Sunyaev-Zel'dovich EffectMay 10 2012Mar 05 2013We present the measured Sunyaev-Zel'dovich (SZ) flux from 474 optically-selected MaxBCG clusters that fall within the Atacama Cosmology Telescope (ACT) Equatorial survey region. The ACT Equatorial region used in this analysis covers 510 square degrees ... More
Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich EffectMar 19 2012Jul 27 2012Using high-resolution microwave sky maps made by the Atacama Cosmology Telescope, we for the first time present strong evidence for motions of galaxy clusters and groups via microwave background temperature distortions due to the kinematic Sunyaev-Zel'dovich ... More
The Atacama Cosmology Telescope: Physical Properties and Purity of a Galaxy Cluster Sample Selected via the Sunyaev-Zel'dovich EffectJun 26 2010Sep 09 2010We present optical and X-ray properties for the first confirmed galaxy cluster sample selected by the Sunyaev-Zel'dovich Effect from 148 GHz maps over 455 square degrees of sky made with the Atacama Cosmology Telescope. These maps, coupled with multi-band ... More
Radio-Continuum Study of the Nearby Sculptor Group Galaxies. Part 2: NGC 55 at λ=20, 13, 6 and 3 cmMay 15 2013A series of new radio-continuum ({\lambda}=20, 13, 6 and 3 cm) mosaic images focused on the NGC55 galactic system were produced using archived observational data from the Australia Telescope Compact Array. These new images are both very sensitive (down ... More
The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectrum at 148 and 218 GHz from the 2008 Southern SurveySep 04 2010We present measurements of the cosmic microwave background (CMB) power spectrum made by the Atacama Cosmology Telescope at 148 GHz and 218 GHz, as well as the cross-frequency spectrum between the two channels. Our results clearly show the second through ... More
The Atacama Cosmology Telescope: Cosmology from Galaxy Clusters Detected via the Sunyaev-Zel'dovich EffectOct 05 2010We present constraints on cosmological parameters based on a sample of Sunyaev-Zel'dovich-selected galaxy clusters detected in a millimeter-wave survey by the Atacama Cosmology Telescope. The cluster sample used in this analysis consists of 9 optically-confirmed ... More
The Atacama Cosmology Telescope: Cosmological parameters from three seasons of dataJan 04 2013Oct 11 2013We present constraints on cosmological and astrophysical parameters from high-resolution microwave background maps at 148 GHz and 218 GHz made by the Atacama Cosmology Telescope (ACT) in three seasons of observations from 2008 to 2010. A model of primary ... More
The Atacama Cosmology Telescope: Data Characterization and Map MakingJul 31 2012Aug 02 2012We present a description of the data reduction and mapmaking pipeline used for the 2008 observing season of the Atacama Cosmology Telescope (ACT). The data presented here at 148 GHz represent 12% of the 90 TB collected by ACT from 2007 to 2010. In 2008 ... More
The Atacama Cosmology Telescope: Calibration with WMAP Using Cross-CorrelationsSep 03 2010We present a new calibration method based on cross-correlations with WMAP and apply it to data from the Atacama Cosmology Telescope (ACT). ACT's observing strategy and map making procedure allows an unbiased reconstruction of the modes in the maps over ... More