Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-11-23
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
20 pages, 18 figures, 2 tables. Accepted for publication in MNRAS, with minor changes. Accepted version plus two typos correct
Scientific paper
We constrain gas and dark matter (DM) parameters of galaxy groups and clusters, by comparing X-ray scaling relations to theoretical expectations, obtained assuming that the gas is in hydrostatic equilibrium with the DM and follows a polytropic relation. We vary four parameters: the gas polytropic index Gamma, its temperature at large radii T_xi, the DM logarithmic slope at large radii zeta and its concentration c_vir. When comparing the model to the observed mass-temperature (M-T) relation of local clusters, our results are independent of both T_xi and c_vir. We thus obtain constraints on Gamma, by fixing the DM profile, and on zeta, by fixing the gas profile. For an NFW DM profile, we find that 6/5
Capelo Pedro R.
Coppi Paolo S.
Natarajan Priyamvada
No associations
LandOfFree
The polytropic approximation and X-ray scaling relations: constraints on gas and dark matter profiles for galaxy groups and clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The polytropic approximation and X-ray scaling relations: constraints on gas and dark matter profiles for galaxy groups and clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The polytropic approximation and X-ray scaling relations: constraints on gas and dark matter profiles for galaxy groups and clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-377975