2001ApJ...549..228S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET23:26:54

2001ApJ...549..228S - Astrophys. J., 549, 228-243 (2001/March-1)

Temperature map of the Virgo cluster of galaxies observed with ASCA.

SHIBATA R., MATSUSHITA K., YAMASAKI N.Y., OHASHI T., ISHIDA M., KIKUCHI K., BOHRINGER H. and MATSUMOTO H.

Abstract (from CDS):

The temperature distribution of the intracluster medium (ICM) in the Virgo Cluster of galaxies has been derived from extensive mapping observations with ASCA covering an area of 19 deg2. In the spectral analysis, the inner region within a radius of ∼60' from M87 is characterized by an ICM temperature of kT∼2.5 keV with little variation. On the other hand, the outer regions indicate significant variation of the temperature with an amplitude of about 1 keV. The temperature map was produced from the hardness ratio (HR) values with a resolution of about 5'. Besides the previously reported hot region with kT>4 keV between M87 and M49, several hot regions with kT=3-4 keV are detected in the cluster outskirts. The autocorrelation function for the HR variation shows that the temperature variation is correlated within a size of about 300 kpc, suggesting that gas blobs falling in the Virgo Cluster have a typical size of groups of galaxies. A correlation with the velocity dispersion of member galaxies shows that only the northwest region indicates an unusually large βspec value of 2-4. The upper limit for extended nonthermal emission in the Virgo Cluster is obtained to be LX∼9x1041 ergs.s–1 in the 2-10 keV band. We discuss that these features consistently indicate that the Virgo Cluster is in a relatively early stage of the cluster evolution.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: Individual: Name: Virgo - Galaxies: Intergalactic Medium - X-Rays: Galaxies

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 776 0
2 ACO 115 ClG 00 55 59.5 +26 19 14           ~ 228 1
3 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 628 1
4 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 980 1
5 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1166 2
6 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1004 1
7 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5718 0
8 ACO 1541 ClG 12 27 38.44 +08 49 16.8           ~ 84 0
9 2MASX J12274483+0841505 Sy1 12 27 44.8629931486 +08 41 50.358741827   17.02 16.64     ~ 31 0
10 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1938 2
11 ACO 1553 ClG 12 30 48.000 +10 33 21.60           ~ 63 0
12 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6100 3
13 2MASX J12322790+1128115 Sy2 12 32 27.8766045727 +11 28 10.783926699           ~ 5 0
14 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 959 2
15 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 961 2
16 HCG 62 CGG 12 53 05.6 -09 12 21           ~ 290 0
17 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4146 2
18 ACO 2065 ClG 15 22 42.6 +27 43 21           ~ 337 0
19 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 663 0
20 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1089 1
21 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 825 1
22 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 496 0
23 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 410 1
24 NAME Cyg A Cluster ClG 19 59 30.3 +40 44 11           ~ 131 0
25 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 559 1
26 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 257 3

    Equat.    Gal    SGal    Ecl

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2020.02.17-23:26:54

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