1.3k citations · 23.5k across the 260 of their papers we have counts for
10 papers · 1 filter
Is AGN feedback necessary to form red elliptical galaxies?
A. Khalatyan, A. Cattaneo, M. Schramm +3
We have used GADGET2 to simulate the formation of an elliptical galaxy in a cosmological dark matter halo with mass 3x10^12M_Sun/h. Using a stellar population synthesis model has a…
HE 1113-0641: The Smallest Separation Gravitational Lens Identified by a Ground-based Optical Telescope
Jeffrey A. Blackburne, Lutz Wisotzki, Paul L. Schechter
The Hamburg/ESO quasar HE 1113-0641 is found to be a quadruple gravitational lens, based on observations with the twin 6.5m Magellan telescopes at the Las Campanas Observatory, and…
Host galaxies of bright high redshift quasars: Luminosities and colours
M. Schramm, L. Wisotzki, K. Jahnke
We present the results of a near-infrared imaging study of high redshift (z~3) quasars using the ESO-VLT. Our targets were selected to have luminosities among the highest known (ab…
New Extremely Metal-Poor Stars in the Galactic Halo
Judith G. Cohen, Norbert Christlieb, Andrew McWilliam +5
We present a detailed abundance analysis based on high resolution and high signal-to-noise spectra of eight extremely metal poor (EMP) stars with [Fe/H] < -3.5$ dex, four of which…
Molecular gas in nearby low-luminosity QSO host galaxies
T. Bertram, A. Eckart, S. Fischer +4
This paper addresses the global molecular gas properties of a representative sample of galaxies hosting low-luminosity quasistellar objects. An abundant supply of gas is necessary…
GEMS: Galaxy fitting catalogues and testing parametric galaxy fitting codes
Boris Häußler, Daniel H. McIntosh, Marco Barden +14
In the context of measuring structure and morphology of intermediate redshift galaxies with recent HST/ACS surveys, we tune, test, and compare two widely used fitting codes (GALFIT…
An integral field spectroscopic survey for high redshift damped Lyman-alpha galaxies
L. Christensen, L. Wisotzki, M. M. Roth +3
We search for galaxy counterparts to damped Lyman-alpha absorbers (DLAs) at z>2 towards nine quasars, which have 14 DLAs and 8 sub-DLAs in their spectra. We use integral field spec…
The transverse proximity effect in spectral hardness on the line of sight towards HE 2347-4342
G. Worseck, C. Fechner, L. Wisotzki +1
We report the discovery of 14 quasars in the vicinity of HE2347-4342, one of the two quasars whose intergalactic HeII forest has been resolved with FUSE. By analysing the HI and th…
A New Type of Extremely Metal Poor Star
Judith G. Cohen, Andrew McWilliam, Norbert Christlieb +5
We present an abundance analysis for the extremely metal poor star HE1424-0241 based on high dispersion spectra from HIRES at Keck. This star is a giant on the lower red giant bran…
Spatial decomposition of on-nucleus spectra of quasar host galaxies
Knud Jahnke, Lutz Wisotzki, Frederic Courbin +1
In order to study the host galaxies of type 1 (broad-line) quasars, we present a semi-analytic modelling method to decompose the on-nucleus spectra of quasars into nuclear and host…