Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Challenges for Precision Cosmology with X-ray and Sunyaev-Zeldovich
  Effect Gas Mass Measurements of Galaxy Clusters   We critically analyze the measurement of galaxy cluster gas masses, which is
central to cosmological studies that rely on the galaxy cluster gas mass
fraction. Using synthetic observations of numerically simulated clusters viewed
through their X-ray emission and thermal Sunyaev-Zeldovich effect (SZE), we
reduce the observations to obtain measurements of the cluster gas mass. We are
thus able to quantify the possible sources of uncertainty and systematic bias
associated with the common simplifying assumptions used in reducing real
cluster observations including isothermality and hydrostatic equilibrium. We
find that intrinsic variations in clusters limit the precision of observational
gas mass estimation to ~10% to 1 sigma confidence excluding instrumental
effects. Gas mass estimates performed via all methods surprisingly show little
or no trending in the scatter as a function of cluster redshift. For the full
cluster sample, methods that use SZE profiles out to roughly the virial radius
are the simplest, most accurate, and unbiased way to estimate cluster mass.
X-ray methods are systematically more precise mass estimators than are SZE
methods if merger and cool core systems are removed, but X-ray methods slightly
overestimate (5-10%) the cluster gas mass on average. We find that cool core
clusters in our samples are particularly poor candidates for observational mass
estimation, even when excluding emission from the core region. The effects of
cooling in the cluster gas alter the radial profile of the X-ray and SZE
surface brightness outside the cool core region, leading to poor gas mass
estimates in cool core clusters. Finally, we find that methods using a
universal temperature profile estimate cluster masses to higher precision than
those assuming isothermality.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph