X-ray and optical observations of normal galaxies
galaxies (ellipticals and lenticulars) dominate the population of
galaxies in most clusters and groups. In the hierarchical picture of
structure formation, these galaxies are assembled by the merger of
smaller galaxies. However, observational evidence in support of this
picture remains sketchy, and even state-of-the-art simulations are
unable to represent the rich complexity of galactic structure, or to
model the crucial effects of "feedback", whereby young stars and
supernova explosions reheat gas, and hence prevent an unrealistically
large fraction of the baryons from cooling out to form stars.
Fossil groups: GMRT observations (with Nazirah Jetha and Habib Khosroshahi)
and spectroscopic studies with Habib Khosroshahi (more coming) of
isolated giant elliptical galaxies with group-scale X-ray emission,
thought to the remnant of the rapid merging of a group of galaxies.
My Publications in this field
Full List of publications