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The formation of galactic discs
We study the population of galactic discs expected in current hierarchical clustering models for structure formation. A rotationally supported disc with exponential surface density profile is assumedExpand
Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies and the Distant Universe
We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observingExpand
Modelling the Galactic bar using OGLE-II red clump giant stars
Red clump giant (RCG) stars can be used as distance indicators to trace the mass distribution of the Galactic bar. We use RCG stars from 44 bulge fields from the OGLE-II microlensing collaborationExpand
We study the properties of infrared-selected QSOs (IR QSOs), optically selected Palomar-Green QSOs (PG QSOs), and narrow-line Seyfert 1 galaxies (NLS1s). We compare their properties from the IR toExpand
Proper motion dispersions of red clump giants in the galactic bulge: observations and model comparisons
Red clump giants (RCGs) in the Galactic bulge are approximate standard candles and hence they can be used as distance indicators. We compute the proper motion dispersions of RCG stars in the GalacticExpand
Luminous Infrared Galaxies in the Local Universe
We study the morphology and star formation properties of 159 local luminous infrared galaxies (LIRGs) using multicolor images from Data Release 2 (DR2) of the Sloan Digital Sky Survey (SDSS). TheExpand
Evidence for substructure in lens galaxies
We discuss whether one should expect that multiply imaged QSOs can be understood with ‘simple’ lens models that contain only a few parameters. Whereas for many lens systems such simple mass modelsExpand
Major dry mergers in early-type brightest cluster galaxies
We search for ongoing major dry mergers in a well-selected sample of local brightest cluster galaxies (BCGs) from the C4 cluster catalogue. 18 out of 515 early-type BCGs with redshift between 0.03Expand
Microlens OGLE-2005-BLG-169 Implies That Cool Neptune-like Planets Are Common
We detect a Neptune mass ratio (q 8 ? 10-5) planetary companion to the lens star in the extremely high magnification (A ~ 800) microlensing event OGLE-2005-BLG-169. If the parent is a main-sequenceExpand
A new photometric model of the Galactic bar using red clump giants
We present a study of the luminosity density distribution of the Galactic bar using number counts of red clump giants (RCGs) from the OGLE-III survey. The data were recently published by Nataf et al.Expand