2004ApJ...613..180S


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST08:35:07

2004ApJ...613..180S - Astrophys. J., 613, 180-188 (2004/September-3)

A Chandra X-ray observation of A1991: the late stages of infall?

SHARMA M., McNAMARA B.R., NULSEN P.E.J., OWERS M., WISE M.W., BLANTON E.L., SARAZIN C.L., OWEN F.N. and DAVID L.P.

Abstract (from CDS):

We present results from a 38 ks Chandra X-ray observation of the z=0.059 galaxy cluster A1991. The cluster has a bright X-ray core and a central temperature gradient that declines inward from 2.7 keV at 130 kpc to ~1.6 keV at the cluster center. The radiative cooling time of the gas in the inner 10 kpc is about 0.5 Gyr, and it rises to 1 Gyr at a radius of 20 kpc. The cooling rate of the gas within the latter radius is ≲25 M/yr. The Chandra ACIS-S3 image shows that the intracluster medium has an asymmetric surface brightness distribution with respect to the central galaxy. Bright knots of soft X-ray emission embedded in a cometary structure are located approximately 10" north of the optical center of the cD galaxy. Unlike the structures seen in other cooling flow clusters, the knots have no obvious association with the radio source. The structure's temperature of 0.83 keV makes it nearly 1 keV cooler than its surroundings, and its mass is 3.4x109M. Based on its bow-shaped appearance and modest overpressure with respect to its surroundings, we interpret the structure as a cool mass concentration that is breaking apart as it travels northward through the center of the cluster.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: Individual: Alphanumeric: A1991 - X-Rays: Galaxies: Clusters

Nomenclature: Table 2: [SMN2004] JHHMMSS.ss+DDMMSS.s N=17.

Status at CDS:  

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 426 ClG 03 19 47.2 +41 30 47           ~ 1931 1
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3522 3
3 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 342 1
4 NAME Hya A LIN 09 18 05.651 -12 05 43.99   14.38 14.8     ~ 901 1
5 ACO 780 ClG 09 18 30 -12 15.7           ~ 425 0
6 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1150 0
7 [SMN2004] J145416.01+183958.1 X 14 54 16.01 +18 39 58.1           ~ 1 0
8 [SMN2004] J145417.99+183502.9 X 14 54 17.99 +18 35 02.9           ~ 1 0
9 [SMN2004] J145422.15+184105.1 X 14 54 22.15 +18 41 05.1           ~ 1 0
10 [SMN2004] J145423.25+183507.5 X 14 54 23.25 +18 35 07.5           ~ 1 0
11 [SMN2004] J145423.94+183523.5 X 14 54 23.94 +18 35 23.5           ~ 1 0
12 [SMN2004] J145425.30+183618.7 X 14 54 25.30 +18 36 18.7           ~ 1 0
13 ACO 1991 ClG 14 54 30.2 +18 37 51           ~ 304 1
14 NGC 5778 BiC 14 54 31.484 +18 38 32.50   15.6       ~ 58 3
15 [SMN2004] J145431.71+183947.7 X 14 54 31.71 +18 39 47.7           ~ 1 0
16 [SMN2004] J145432.06+184000.2 X 14 54 32.06 +18 40 00.2           ~ 1 0
17 2MASXI J1454321+184052 GiC 14 54 32.2132278181 +18 40 53.259585721           ~ 6 0
18 [SMN2004] J145434.66+183726.2 X 14 54 34.66 +18 37 26.2           ~ 1 0
19 [SMN2004] J145435.10+184103.5 X 14 54 35.10 +18 41 03.5           ~ 1 0
20 2MASXI J1454362+184118 GiC 14 54 36.207 +18 41 19.02   15       ~ 9 0
21 [SMN2004] J145437.82+183955.7 X 14 54 37.82 +18 39 55.7           ~ 1 0
22 [SMN2004] J145439.14+183754.4 X 14 54 39.14 +18 37 54.4           ~ 1 0
23 [SMN2004] J145439.27+183524.8 X 14 54 39.27 +18 35 24.8           ~ 1 0
24 [SMN2004] J145441.01+183729.1 X 14 54 41.01 +18 37 29.1           ~ 1 0
25 2MASS J14544284+1839036 X 14 54 42.8445486317 +18 39 03.388691131           ~ 1 0
26 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 563 1

    Equat.    Gal    SGal    Ecl

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2020.05.27-08:35:07

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