2003ApJ...597..202D

Query : 2003ApJ...597..202D

2003ApJ...597..202D - Astrophys. J., 597, 202-209 (2003/November-1)

Chandra observations of point sources in A2255.

DAVIS D.S., MILLER N.A. and MUSHOTZKY R.F.

Abstract (from CDS):

In our search for ``hidden'' active galactic nuclei (AGNs), we present results from a Chandra observation of the nearby cluster A2255. Eight cluster galaxies are associated with pointlike X-ray emission, and we classify these galaxies based on their X-ray, radio, and optical properties. At least three are associated with AGNs with no optical signatures of nuclear activity, with a further two being potential AGNs. Of the potential AGNs, one corresponds to a galaxy with a post-starburst optical spectrum. The remaining three X-ray-detected cluster galaxies consist of two starbursts and an elliptical with luminous hot gas. Of the eight cluster galaxies, five are associated with luminous (massive) galaxies, and the remaining three lie in much lower luminosity systems. We note that the use of X-ray-to-optical flux ratios for classification of X-ray sources is often misleading and strengthens the claim that the fraction of cluster galaxies hosting an AGN based on optical data is significantly lower than the fraction based on X-ray and radio data.

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Journal keyword(s): Galaxies: Active - Galaxies: Clusters: General - Galaxies: Clusters: Individual: Alphanumeric: A2255 - Galaxies: Intergalactic Medium - X-Rays: Galaxies

Nomenclature: Table 1: [DMM2003] N (Nos 1-8).

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ClG J0030+2618 ClG 00 30 33.6 +26 18 16           ~ 65 0
2 ACO 194 ClG 01 26 01.3 -01 22 02           ~ 363 2
3 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
4 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2
5 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
6 NGC 3862 Sy2 11 45 05.00904503 +19 36 22.7409909   14.98 13.97     ~ 646 1
7 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
8 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
9 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
10 ACO 2104 ClG 15 40 06.8 -03 17 39           ~ 113 0
11 GSC2 N1121133294 * 16 50 44.3822672976 +63 10 57.798645996           ~ 1 0
12 SDSS J171206.87+640831.9 EmG 17 12 06.8867392368 +64 08 31.757416692           ~ 11 0
13 2MASX J17121627+6402124 rG 17 12 16.2048196872 +64 02 12.380038440           ~ 14 0
14 [PVK2003] 258.09561 +64.14133 rG 17 12 22.9429637616 +64 08 28.667668020           ~ 11 0
15 8C 1712+641 rG 17 12 23.8007008608 +64 02 11.388271056           ~ 19 1
16 LEDA 3138983 Sy1 17 12 34.0865559648 +64 05 49.818013800           ~ 11 0
17 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
18 LEDA 59855 rG 17 13 02.0327007072 +64 03 08.331951780           ~ 11 0
19 2MASX J17130384+6407014 rG 17 13 03.7806794784 +64 07 01.673867568           ~ 32 0
20 [YZJ2003] 2- 63 Sy1 17 13 20.49076 +64 00 33.9971           ~ 11 0
21 7C 1713+6407b LIN 17 13 29.113 +64 02 48.73           ~ 45 2
22 NVSS J171343+640501 rG 17 13 42.9686981760 +64 04 55.058304684           ~ 13 0

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