2011A&A...528A.102M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET22:14:59

2011A&A...528A.102M - Astronomy and Astrophysics, volume 528A, 102-102 (2011/4-1)

Gas temperature profiles in galaxy clusters with Swift XRT: observations and capabilities to map near R200.

MORETTI A., GASTALDELLO F., ETTORI S. and MOLENDI S.

Abstract (from CDS):

We investigate the possibility of using the X-ray telescope (XRT) on board the Swift satellite to improve the current accuracy of the intra-cluster medium (ICM) temperature measurements in the region close to the virial radius of nearby clusters. We present the spectral analysis of the Swift XRT observations of 6 galaxy clusters and their temperature profiles in the regions within 0.2-0.6r200. Four of them are nearby famous and very well studied objects (Coma, Abell 1795, Abell 2029 and PKS0745-19). The remaining two, SWJ1557+35 (Abell 2141) and SWJ0847+13, at redshift z=0.16 and z=0.36, were serendipitously observed by Swift-XRT. We accurately quantify the temperature uncertainties, with particular focus on the impact of the background scatter (both instrumental and cosmic). We extrapolate these results and simulate a deep observation of the external region of Abell 1795 which is assumed here as a case study. In particular we calculate the expected uncertainties in the temperature measurement as far as r200. We find that, with a fairly deep observation (300ks), the Swift XRT would be able to measure the ICM temperature profiles in the external regions as far as the virial radius, significantly improving the best accuracy among the previous measurements. This can be achieved thanks to the unprecedented combination of good PSF over the full field of view and very accurate control of the instrumental background. Somehow unexpectedly we conclude that, among currently operating telescope, the Swift-XRT is the only potentially able to improve the current accuracy in plasma temperature measurement at the edges of the cluster potential. This will be true until a new generation of low-background and large field of view telescopes, aimed to the study of galaxy clusters, will operate. These observations would be of great importance in developing the observing strategy for such missions.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: intracluster medium - X-rays: diffuse background - methods: statistical

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASX J07473129-1917403 BiC 07 47 31.296 -19 17 40.34   19.60       ~ 394 1
2 ClG 0745-19 ClG 07 47 31.3 -19 17 40           ~ 365 0
3 SWXCS J084749+133141 ClG 08 47 49.32 +13 31 40.4           ~ 6 0
4 GRB 051016B gB 08 48 27.810 +13 39 20.00 20.45         ~ 124 0
5 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 758 0
6 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 386 0
7 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4317 2
8 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1177 0
9 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 870 0
10 SWXCS J155742+353023 ClG 15 57 42.3 +35 30 29           ~ 3 0
11 ACO 2141 ClG 15 57 46 +35 27.5           ~ 37 0
12 GRB 090618 gB 19 36 01.80 +78 21 07.1           ~ 275 0
13 GRB 090409 gB 20 08 +01.1           ~ 10 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-22:14:59

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