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Results for "C. A. M. van den Bosch"
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The Impact of Cooling and Feedback on Disc GalaxiesDec 31 2001We present detailed, analytical models for the formation of disc galaxies to investigate the impact that cooling and feedback have on their structural properties. In particular, we investigate which observables extracted directly from the models are best ... More Constraints on Galaxy Formation from the Tully-Fisher RelationSep 30 1999New models for the formation of disk galaxies are presented. I discuss the contraints on galaxy formation that follow from fitting the model to the near-infrared Tully-Fisher (TF) relation, with an emphasis on reproducing the small amount of scatter observed. ... More New Problems for the Formation of Disk GalaxiesAug 29 2002The standard picture for the formation of disk galaxies has come to face a number of problems related to angular momentum. Numerical simulations produce disks that are too small, and analytical models predict too much low angular momentum compared to ... More The Universal Mass Accretion History of CDM HaloesMay 09 2001Dec 28 2001We use the extended Press-Schechter formalism to investigate the rate at which cold dark matter haloes accrete mass. We discuss the shortcomings of previous methods that have been used to compute the mass accretion histories of dark matter haloes, and ... More Measuring the Virial Masses of Disk GalaxiesJan 02 2002I present detailed models for the formation of disk galaxies, and investigate which observables are best suited as virial mass estimators. Contrary to naive expectations, the luminosities and circular velocities of disk galaxies are extremely poor indicators ... More The dependence of low redshift galaxy properties on environmentJan 17 2011We review recent results on the dependence of various galaxy properties on environment at low redshift. As environmental indicators, we use group mass, group-centric radius, and the distinction between centrals and satellites; examined galaxy properties ... More The Tully-Fisher Zero Point ProblemJan 09 2008A long standing problem for hierarchical disk galaxy formation models has been the simultaneous matching of the zero point of the Tully-Fisher relation and the galaxy luminosity function (LF). We illustrate this problem for a typical disk galaxy and discuss ... More The Impact of Feedback on Disk Galaxy Scaling RelationsJan 19 2010We use a disk formation model to study the effects of galactic outflows (a.k.a. feedback) on the rotation velocity - stellar mass - disk size, gas fraction - stellar mass, and gas phase metalicity - stellar mass scaling relations of disk galaxies. We ... More The Impact of Feedback on Disk Galaxy Scaling RelationsOct 28 2008May 04 2009We use a disk galaxy evolution model to investigate the impact of mass outflows (a.k.a. feedback) on disk galaxy scaling relations. Our model follows the accretion, cooling, star formation and ejection of baryonic mass inside growing dark matter haloes, ... More Evidence for a massive BH in the S0 galaxy NGC 4342May 26 1998We present axisymmetric dynamical models of the edge-on S0 galaxy NGC 4342. A combination of observations from the ground and with the Hubble Space Telescope (HST) has shown that NGC 4342 rotates rapidly and has a strong central increase in velocity dispersion. ... More Evidence for a Massive Black Hole in the S0 Galaxy NGC 4342Nov 11 1998We have constructed axisymmetric dynamical models of the edge-on S0 galaxy NGC 4342: simple two-integral Jeans models as well as fully general, three-integral models using a modified version of Schwarzschild's orbit superposition technique. The two-integral ... More Comprehensive Assessment of the Too-Big-to-Fail ProblemAug 11 2015We use a semi-analytical model for the substructure of dark matter haloes to assess the too-big-to-fail (TBTF) problem. The model accurately reproduces the average subhalo mass and velocity functions, as well as their halo-to-halo variance, in N-body ... More Bar driven evolution of S0s: the edge-on galaxy NGC 4570Apr 03 1998We present circumstantial evidence that the central region of the edge-on S0 galaxy NGC 4570, which harbors a 150 pc scale nuclear disc in addition to its main outer disc, has been shaped under the influence of a small (approx. 500pc) bar. This is based ... More A Nuclear Disk and massive BH in NGC 4342Nov 19 1996We discuss photometric and spectroscopic data of the E/S0 galaxy NGC 4342, obtained with the Hubble Space Telescope (HST). This galaxy harbors, in addition to its outer disk, a very small, stellar disk in its nucleus. Jeans-modeling suggests the presence ... More Giant Memcapacitance in Topotactic Redox InterfacesMay 14 2019The possibility to develop neuromorphic computing devices able to mimic the extraordinary data processing capabilities of biological systems spurs the research on memristive systems. Memristors with additional functionalities such as robust memcapacitance ... More Recovering the intrinsic shape of early-type galaxiesNov 21 2008Jul 09 2009We investigate how well the intrinsic shape of early-type galaxies can be recovered when both photometric and two-dimensional stellar kinematic observations are available. We simulate these observations with galaxy models that are representative of observed ... More Modelling the line-of-sight contribution in substructure lensingOct 13 2017Jan 26 2018We investigate how Einstein rings and magnified arcs are affected by small-mass dark-matter haloes placed along the line-of-sight to gravitational lens systems. By comparing the gravitational signature of line-of-sight haloes with that of substructures ... More The Dependence of Galaxy Type on Host Halo MassJul 26 2006We examine the relation between galaxy properties and environment in the SDSS DR2, quantifying environment in terms of the mass of the host halo, which is obtained with a new iterative group finder. We find that galaxy type fractions scale strongly and ... More Are Brightest Halo Galaxies Central Galaxies?Jan 25 2010Jul 22 2011It is generally assumed that the central galaxy in a dark matter halo, that is, the galaxy with the lowest specific potential energy, is also the brightest halo galaxy (BHG), and that it resides at rest at the centre of the dark matter potential well. ... More Natural Downsizing in Hierarchical Galaxy FormationMay 01 2006Oct 20 2006Stellar-population analyses of today's galaxies show "downsizing", where the stars in more massive galaxies tend to have formed earlier and over a shorter time span. We show that this phenomenon is not necessarily "anti-hierarchical" but rather has its ... More Towards Cosmological Concordance on Galactic ScalesJan 07 2003Dec 09 2003We use the observed abundance and clustering of galaxies from the 2dFGRS to determine the matter density Omega_m and the linear amplitude of mass fluctuations sigma_8. We use a method based on the conditional luminosity function, which allows straightforward ... More The Galaxy Dark Matter ConnectionDec 01 2004What galaxy lives in what halo? The answer to this simple question holds important information regarding galaxy formation and evolution. We describe a new statistical technique to link galaxies to their dark matter haloes, or light to mass, using the ... More Galaxy Groups in the SDSS DR4: II. halo occupation statisticsOct 26 2007Dec 20 2007We investigate various halo occupation statistics using a large galaxy group catalogue constructed from the SDSS DR4 with an adaptive halo-based group finder. The conditional luminosity function (CLF) is measured separately for all, red and blue galaxies, ... More Estimating Black Hole Masses in Triaxial GalaxiesOct 05 2009Most of the super massive black hole mass estimates based on stellar kinematics use the assumption that galaxies are axisymmetric oblate spheroids or spherical. Here we use fully general triaxial orbit-based models to explore the effect of relaxing the ... More Linking Early and Late Type Galaxies to their Dark Matter HaloesOct 22 2002Dec 09 2003(Abridged) Using data from the 2dFGRS we compute the conditional luminosity functions (CLFs) of early- and late-type galaxies. These functions give the average number of galaxies with luminosity L that reside in a halo of mass M, and are a powerful statistical ... More Orbit-based dynamical models of the Sculptor dSph galaxyMay 21 2012Aug 06 2013We have developed spherically symmetric dynamical models of dwarf spheroidal galaxies using Schwarzschild's orbit superposition method. This type of modelling yields constraints both on the total mass distribution (e.g. enclosed mass and scale radius) ... More Observational Evidence for an Age Dependence of Halo BiasSep 21 2005Jan 11 2006We study the dependence of the cross-correlation between galaxies and galaxy groups on group properties. Confirming previous results, we find that the correlation strength is stronger for more massive groups, in good agreement with the expected mass dependence ... More Schwarzschild models of the Sculptor dSph galaxyOct 21 2011We have developed a spherically symmetric dynamical model of a dwarf spheroidal galaxy using the Schwarzschild method. This type of modelling yields constraints both on the total mass distribution (e.g. enclosed mass and scale radius) as well as on the ... More Dusty Nuclear Disks and Filaments in Early Type GalaxiesFeb 16 2001We examine the dust properties of a nearby distance-limited sample of early type galaxies using the WFPC2 of the Hubble Space Telescope. Dust is detected in 29 out of 67 galaxies (43%), including 12 with small nuclear dusty disks. In a separate sample ... More Discrete dynamical modelling of omega CentauriAug 22 2013We present a new framework for modelling discrete kinematic data. Current techniques typically involve binning. Our approach works directly with the discrete data and uses maximum-likelihood methods to assess the probability of the dataset given model ... More The clustering of SDSS galaxy groups: mass and color dependenceNov 28 2007Jul 15 2008We use a sample of galaxy groups selected from the SDSS DR 4 with an adaptive halo-based group finder to probe how the clustering strength of groups depends on their masses and colors. In particular, we determine the relative biases of groups of different ... More The Phase-Space Parameters of Brightest Halo GalaxiesFeb 23 2005Mar 01 2005The brightest galaxy in a dark matter halo is expected to reside at rest at the center of the halo. In this paper we test this `Central Galaxy Paradigm' using group catalogues extracted from the 2dFGRS and the SDSS. For each group we compute a parameter, ... More The low dark matter content of the lenticular galaxy NGC 3998May 16 2016We observed the lenticular galaxy NGC 3998 with the Mitchell Integral-Field Spectrograph and extracted line-of-sight velocity distributions out to 3 half-light radii. We constructed collisionless orbit models in order to constrain NGC 3998's dark and ... More Radial velocities in the globular cluster omega CentauriSep 08 2005We have used the ARGUS multi-object spectrometer at the CTIO 4m Blanco telescope to obtain 2756 radial velocity measurements for 1966 individual stars in the globular cluster omega Centauri brighter than blue photographic magnitude of about 16.5. Of these, ... More Recovery of the internal orbital structure of galaxiesDec 03 2007Jan 03 2008We construct axisymmetric and triaxial galaxy models with a phase-space distribution function that depends on linear combinations of the three exact integrals of motion for a separable potential. These Abel models, first introduced by Dejonghe & Laurent ... More The central dark matter distribution of NGC 2976Oct 27 2011We study the mass distribution in the late-type dwarf galaxy NGC 2976 through stellar kinematics obtained with the VIRUS-P integral-field spectrograph and anisotropic Jeans models as a test of cosmological simulations and baryonic processes that putatively ... More