2020ApJ...889..121D


Query : 2020ApJ...889..121D

2020ApJ...889..121D - Astrophys. J., 889, 121-121 (2020/February-1)

Clusters of galaxies masquerading as X-ray quasars.

DONAHUE M., FUNKHOUSER K., KOEPPE D., FRISBIE R.L.S. and VOIT G.M.

Abstract (from CDS):

Inspired by the discovery of the Phoenix cluster by the South Pole Telescope team, we initiated a search for other massive clusters of galaxies missing from the standard X-ray catalogs. We began by identifying 25 cluster candidates not included in the Meta-Catalog of X-ray Clusters of galaxies cluster compilation through cross-identification of the central galaxies of optically identified clusters in the Sloan Digital Sky Survey GMBCG catalog with bright X-ray sources in the ROSAT Bright Source Catalog. Those candidates were mostly unidentified or previously classified as X-ray active galactic nucleus (AGN). We analyzed brief Chandra X-ray Observatory observations of 14 of these X-ray sources and found that eight are X-ray luminous clusters of galaxies, only one showing evidence for a central X-ray point source. The remaining six candidates turned out to be point-source dominated, with faint detections or upper limits on any extended emission. We were not able to rule out the presence of extended X-ray emission from any of the point sources. The levels of extended emission around the six point sources are consistent with expectations based on optical richness, but could also be contaminated by scattered X-ray light from the central point source or extended nonthermal emission from possible radio lobes. We characterize the extended components of each of the well-detected cluster sources, finding that six of the eight X-ray clusters are consistent with being compact cool-core clusters. One of the newly identified low-luminosity X-ray clusters may have had an X-ray-luminous AGN 20 yr prior to the recent Chandra observations, based on the 4σ difference between its Chandra and ROSAT fluxes.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy clusters - X-ray identification - X-ray sources - X-ray quasars

Simbad objects: 27

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Number of rows : 27
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 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2033 1
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3680 3
3 3C 186 QSO 07 44 17.4723761217 +37 53 17.249506697   17.5 18.14 17.2   ~ 292 1
4 7C 082452.20+420348.00 BLL 08 28 14.2029027444 +41 53 51.877901668   19.72 18.70     ~ 37 1
5 ICRF J083454.9+553421 Sy2 08 34 54.90395243 +55 34 21.0703658   20.75 19.45 17.180   ~ 262 2
6 7C 085042.79+623017.00 BLL 08 54 50.5776011059 +62 18 50.211235941     19.00 17   ~ 36 1
7 2MASX J09053355+1840025 Sy1 09 05 33.560 +18 40 02.59     16.20     ~ 12 0
8 [VV96] J090953.3+310603 BLL 09 09 53.2840025953 +31 06 03.172079765   18.74 17.98     ~ 44 0
9 2MASS J09134545+4056282 Sy2 09 13 45.4949162350 +40 56 28.214305677   19.69 19.21     ~ 238 2
10 6C 091313+525115 BLL 09 16 51.9356042953 +52 38 28.342414318   19.02 18.10 15   ~ 53 1
11 3C 219 Sy1 09 21 08.6263828902 +45 38 57.345842278   19.56 18.69     ~ 391 2
12 ZwCl 0923+5340 ClG 09 27 10.8 +53 27 00           ~ 16 0
13 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6       ~ 262 0
14 6C 102729+514755 QSO 10 30 35.12567 +51 32 32.1544     18.40     ~ 16 1
15 RX J1119.1+0900 X 11 19 09.00 +09 00 22.0           ~ 4 0
16 ACO 1290 ClG 11 31 21.4 +33 34 47           ~ 14 0
17 QSO B1212+078 BLL 12 15 10.9769954937 +07 32 04.674253273     16.0 14.8   ~ 84 1
18 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6084 0
19 4C -02.55 QSO 12 32 00.0157879377 -02 24 04.790684994   17.41 17.06 16.4   ~ 395 1
20 ICRF J135022.1+094010 Sy1 13 50 22.1359722 +09 40 10.654570   16.0 15.0 12.40   ~ 42 0
21 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 646 1
22 QSO B1440+122 BLL 14 42 48.276582 +12 00 40.37487   18.34 17.63 15.2   ~ 148 3
23 RX J1456.1+3021 X 14 56 11.2 +30 21 08           ~ 3 0
24 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 883 0
25 RX J1705.9+3657 X 17 05 56.95 +36 56 54.0           ~ 4 0
26 2E 4066 Sy1 18 21 57.2365 +64 20 36.226   14.23 14.24     ~ 549 1
27 NAME Phoenix Cluster ClG 23 44 40.9 -42 41 54           ~ 141 0

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2021.09.21-07:16:58

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