Seminars and Colloquia
Physics
The edges of Galaxy clusters and self-interaction cross-section of dark matter
Fri, Feb 26, 2016,
11:30 AM
at Seminar Room 31, 2nd Floor, Main Building
Dr. Surhud More
IPMU Tokyo
Galaxy clusters are the Mega-cities of our universe: they
are the rare dense regions containing thousands of galaxies. I will
present a detection of the edges of such galaxy clusters, also called
the splashback radius, using observations from the Sloan Digital Sky
Survey. I will show that the observed location of the edges of galaxy
clusters are about 20 percent smaller than that expected in the
standard cosmological model. I will discuss systematics which could
result in smaller splashback radius and conclude by discussing a
simple model of dark matter self-interactions which could also
potentially explain this result.
