Mergers and Bulge Formation in Lambda-CDM: Which Mergers Matter? (2009)
Hopkins, Philip F., Bundy, Kevin, Croton, Darren, Hernquist, Lars, Keres, Dusan, Khochfar, Sadegh, ...
We use a suite of semi-empirical models to predict galaxy merger rates and contributions to bulge growth as functions of merger mass, redshift, and mass ratio. The models use empirical halo...
Galaxy Zoo: A sample of blue early-type galaxies at low redshift (2009)
Schawinski, Kevin, Lintott, Chris, Thomas, Daniel, Sarzi, Marc, Andreescu, Dan, Bamford, Steven P., ...
We report the discovery of a population of nearby, blue early-type galaxies with high star formation rates (0.5 < SFR < 50 Msun/yr). They are identified by their visual morphology as provided by...
Ferreras, Ignacio, Lisker, Thorsten, Pasquali, Anna, Khochfar, Sadegh, Kaviraj, Sugata
The evolution of number density, size and intrinsic colour is determined for a volume-limited sample of visually classified early-type galaxies selected from the HST/ACS images of the GOODS North and...
Galaxy Zoo: a sample of blue early-type galaxies at low redshift (2009)
Schawinski, Kevin, Lintott, Chris, Thomas, Daniel, Sarzi, Marc, Andreescu, Dan, Bamford, Steven P., ...
The role of minor mergers in the recent star formation history of early-type galaxies (2009)
Kaviraj, Sugata, Peirani, Sebastien, Khochfar, Sadegh, Silk, Joseph, Kay, Scott
Weinzirl, Tim, Jogee, Shardha, Khochfar, Sadegh, Burkert, Andreas, Kormendy, John
We use the bulge Sersic index n and bulge-to-total ratio (B/T) to explore the fundamental question of how bulges form. We perform 2D bulge-disk-bar decomposition on H-band images of 143 bright, high...
The role of minor mergers in the recent star formation history of early-type galaxies (2007)
Kaviraj, Sugata, Peirani, Sebastien, Khochfar, Sadegh, Silk, Joseph, Kay, Scott
We demonstrate that the large scatter in the ultra-violet (UV) colours of intermediate-mass early-type galaxies in the local Universe and the inferred low-level recent star formation in these objects...
Schawinski, Kevin, Khochfar, Sadegh, Kaviraj, Sugata, Yi, Sukyoung K., Boselli, Alessandro, Barlow, Tom, ...
Detailed high-resolution observations of the innermost regions of nearby galaxies have revealed the presence of supermassive black holes1. These black holes may interact with their host galaxies by...
Schawinski, Kevin, Khochfar, Sadegh, Kaviraj, Sugata, Yi, Sukyoung K., Boselli, Alessandro, Barlow, Tom, ...
Detailed high-resolution observations of the innermost regions of nearby galaxies have revealed the presence of supermassive black holes1. These black holes may interact with their host galaxies by...
A simple model for the size-evolution of elliptical galaxies (2006)
Khochfar, Sadegh, Silk, Joseph
We use semi-analytical modelling of galaxy formation to predict the redshift-size-evolution of elliptical galaxies. Using a simple model in which relative sizes of elliptical galaxies of a given mass...
How galaxies lose their angular momentum (2006)
D'Onghia, Elena, Burkert, Andreas, Murante, Giuseppe, Khochfar, Sadegh
Properties of Early-Type, Dry Galaxy Mergers and the Origin of Massive Elliptical Galaxies (2005)
Naab, Thorsten, Khochfar, Sadegh, Burkert, Andreas
The luminosity dependence of kinematical and isophotal properties of elliptical galaxies is investigated using numerical simulations of galaxy merging, combined with semi-analytical models of...
On the Origin of Isophotal Shapes in Elliptical Galaxies (2004)
Khochfar, Sadegh, Burkert, Andreas
Using semi-analytical models of galaxy formation, the origin of boxy and disky elliptical galaxies is investigated. We find that the simple scenario, motivated by N-body simulations, in which the...
Origin and Properties of Elliptical Galaxies in a Hierarchical Universe (2003)
The formation of elliptical galaxies by merging galaxies has been investigatedadopting three different paths. First, we confirm that the frequency ofmajor merger events predicted by hierarchical...
The Importance of Dry and Mixed Mergers for Early-Type Galaxy Formation (2003)
Khochfar, Sadegh, Burkert, Andreas
We use semi-analytical modelling techniques to investigate the progenitor morphologies of present day ellipticals. We find that, independent of the environment, the fraction of mergers of bulge...
The mix of disky and boxy ellipticals (2003)
Khochfar, Sadegh, Burkert, Andreas
We use semi-analytical modelling of galaxy formation to predict the mix of elliptical galaxies with boxy and disky isophotes, assuming they originated from major mergers of different mass ratios....
Origin and properties of elliptical galaxies in a hierarchical universe / (2003)
Heidelberg, University, Diss., 2003 (Nicht für den Austausch).
Heidelberg, University, Diss., 2003.
Origin and Properties of Elliptical Galaxies in a Hierarchical Universe (2003)
The formation of elliptical galaxies by merging galaxies has been investigated adopting three different paths. First, we confirm that the frequency of major merger events predicted by hierarchical...