Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new method for finding and characterizing galaxy groups via
  low-frequency radio surveys   We describe a new method for identifying and characterizing the thermodynamic
state of large samples of evolved galaxy groups at high redshifts using
high-resolution, low-frequency radio surveys, such as those that will be
carried out with LOFAR and the Square Kilometre Array (SKA). We identify a
sub-population of morphologically regular powerful (FRII) radio galaxies and
demonstrate that, for this sub-population, the internal pressure of the radio
lobes is a reliable tracer of the external intragroup/intracluster medium (ICM)
pressure, and that the assumption of a universal pressure profile for relaxed
groups enables the total mass and X-ray luminosity to be estimated. Using a
sample of well-studied FRII radio galaxies, we demonstrate that our method
enables the estimation of group/cluster X-ray luminosities over three orders of
magnitude in luminosity to within a factor of ~2 from low-frequency radio
properties alone. Our method could provide a powerful new tool for building
samples of thousands of evolved galaxy groups at z>1 and characterizing their
ICM.

30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio