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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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82 papers · 1 filter
The Stellar Content and Distance of UGC 4483
A. E. Dolphin, L. Makarova, I. D. Karachentsev +7
We present HST/WFPC2 observations of UGC 4483, an irregular galaxy in the M81/NGC 2403 complex. Stellar photometry was carried out with HSTphot, and is complete to V ~ 26.0 and I ~…
The Luminosity Function Of Field Galaxies And Its Evolution Since z=1
J. W. Fried, B. von Kuhlmann, K. Meisenheimer +8
We present the B-band luminosity function and comoving space and luminosity densities for a sample of 2779 I-band selected field galaxies based on multi-color data from the CADIS s…
Detection of massive tidal tails around the globular cluster Pal 5 with SDSS commissioning data
M. Odenkirchen, E. K. Grebel, C. M. Rockosi +17
We report the discovery of two well-defined tidal tails emerging from the sparse remote globular cluster Palomar 5. These tails stretch out symmetrically to both sides of the clust…
Variability in ultra cool dwarfs: evidence for the evolution of surface features
C. A. L. Bailer-Jones, R. Mundt
We present photometric light curves for a sample of 21 ultra cool M and L dwarfs in the field and in the young open clusters sigma Orionis and the Pleiades. Evidence for variabilit…
Self-Interacting Cold Dark Matter Halos
Andreas Burkert
The evolution of halos consisting of weakly self-interacting dark matter particles is summarized. The halos initially contain a central density cusp as predicted by cosmological mo…
A Young Stellar Cluster in the Nucleus of NGC 4449
T. Boeker, R. P. van der Marel, L. Mazzuca +4
We have obtained 1-2 A resolution optical Echellette spectra of the nuclear star cluster in the nearby starburst galaxy NGC 4449. The light is clearly dominated by a very young (6-…
Deep BVR photometry of the Chandra Deep Field South from the COMBO-17 survey
C. Wolf, S. Dye, M. Kleinheinrich +3
We report on deep multi-color imaging (R_5-sigma = 26) of the Chandra Deep Field South, obtained with the Wide Field Imager (WFI) at the MPG/ESO 2.2 m telescope on La Silla as part…
Evidence for a Supermassive Black Hole in the S0 Galaxy NGC 3245
A. J. Barth, M. Sarzi, H. -W. Rix +3
The S0 galaxy NGC 3245 contains a circumnuclear disk of ionized gas and dust with a radius of 1.1" (110 pc), making it an ideal target for dynamical studies with the Hubble Space T…
Towards optimal softening in 3D N-body codes: I. Minimizing the force error
Walter Dehnen
In N-body simulations of collisionless stellar systems, the forces are softened to reduce the shot noise. Softening modifies gravity at r=|x-y| smaller than softening length epsilo…
Star Formation-Regulated Growth of Black Holes in Protogalactic Spheroids
Andreas Burkert, Joseph Silk
The observed relation between central black hole mass and spheroid velocity dispersion is interpreted in terms of a self-regulation model that incorporates a viscous Keplerian accr…
B1359+154: A Six Image Lens Produced by a z=1 Compact Group of Galaxies
D. Rusin, C. S. Kochanek, M. Norbury +8
HST V and I-band observations show that the gravitational lens B1359+154 consists of six images of a single z_s=3.235 radio source and its star-forming host galaxy, produced by a c…
Very Low Mass Stars and Brown Dwarfs of the Young Open Cluster IC2391
D. Barrado y Navascués, John R. Stauffer, César Briceño +4
We have identified a large sample of probable low mass members of the young open cluster IC2391 based on optical (VRIZ) and Infrared (JHK) photometry. Our sample includes 50 pr…
A high-resolution multi-wavelength study of the jet in 3C 273
S. Jester, H. -J. Roeser, K. Meisenheimer +2
We present HST images at 622 nm and 300 nm of the optical jet in 3C273 and determine the run of the optical spectral index at 0.2" along the jet. We find no evidence for localized…
Classification and Redshift Estimation in Multi-Color Surveys
Christian Wolf, Klaus Meisenheimer, Hermann-Josef Röser
We present a photometric method for identifying stars, galaxies and quasars in multi-color surveys and estimating multi-color redshifts for the extragalactic objects. We use a libr…
Measuring Stellar and Dark Mass Fractions in Spiral Galaxies
Thilo Kranz, Adrianne Slyz, Hans-Walter Rix
We explore the relative importance of the stellar mass density as compared to the inner dark halo, for the observed gas kinematics thoughout the disks of spiral galaxies. We perfor…
Star Formation from Turbulent Fragmentation
Ralf Klessen
Star formation is intimately linked to the dynamical evolution of molecular clouds. Turbulent fragmentation determines where and when protostellar cores form, and how they contract…
From the Top to the Bottom of the Main Sequence: A Complete Mass Function of the Young Open Cluster M35
D. Barrado y Navascués, John R. Stauffer, Jerome Bouvier +1
We present very deep and accurate photometry of the open cluster M35 (VRIc filters). We have covered a region of 27.5x27.5 square arcmin. The data range from Ic=12.5 to 23.5 mag, a…
WIYN Open Cluster Study 5. Lithium Depletion and Metallicity in G and K Dwarfs of the Open Cluster M35
D. Barrado y Navascues, Constantine P. Deliyannis, John R. Stauffer
We present an analysis of high quality spectra of members of the young cluster M35. By using a multi-fiber spectrograph, we are able to collect high signal-to-noise, high resolutio…
Star Formation Histories of Nearby Dwarf Galaxies
Eva K. Grebel
Properties of nearby dwarf galaxies are briefly discussed. Dwarf galaxies vary widely in their star formation histories, the ages of their subpopulations, and in their enrichment h…
Multi-color Classification in the Calar Alto Deep Imaging Survey
C. Wolf, K. Meisenheimer, H. -J. Röser +12
We use a multi-color classification method introduced by Wolf, Meisenheimer & Roeser (2000) to reliably identify stars, galaxies and quasars in the up to 16-dimensional color space…
SuperMassive Black Holes in Bulges
Marc Sarzi, Hans-Walter Rix, Joseph C. Shields +5
We present spatially extended gas kinematics at parsec-scale resolution for the nuclear regions of four nearby disk galaxies, and model them as rotation of a gas disk in the joint…
FIRES at the VLT: Measuring the Rest-Frame V-Band Luminosity of Galaxies from z~3 to Now
Gregory Rudnick, Hans-Walter Rix, Marijn Franx
We present early results from the Faint InfraRed Extragalactic Survey (FIRES) at the VLT, the main goal of which is to study galaxy evolution in a deep, K-band selected sample. Wit…
Object Classification in Astronomical Multi-Color Surveys
C. Wolf, K. Meisenheimer, H. -J. Röser
We present a photometric method for identifying stars, galaxies and quasars in multi-color surveys, which uses a library of >65000 color templates. The method aims for extracting t…
The European Large Area ISO Survey IV: the preliminary 90 micron luminosity function
S. Serjeant, A. Efstathiou, S. Oliver +11
We present the luminosity function of 90um selected galaxies from the European Large Area ISO Survey (ELAIS), extending to z=0.3. Their luminosities are in the range 10^9 < h_65^-2…