2012AJ....144...48H

Query : 2012AJ....144...48H

2012AJ....144...48H - Astron. J., 144, 48 (2012/August-0)

Fresh activity in old systems: radio AGNs in fossil groups of galaxies.

HESS K.M., WILCOTS E.M. and HARTWICK V.L.

Abstract (from CDS):

We present the first systematic 1.4 GHz Very Large Array radio continuum survey of fossil galaxy group candidates. These are virialized systems believed to have assembled over a gigayear in the past through the merging of galaxy group members into a single, isolated, massive elliptical galaxy and featuring an extended hot X-ray halo. We use new photometric and spectroscopic data from Sloan Digital Sky Survey Data Release 7 to determine that three of the candidates are clearly not fossil groups. Of the remaining 30 candidates, 67% contain a radio-loud (L_1.4 GHz_> 1023 W.Hz–1) active galactic nucleus (AGN) at the center of their dominant elliptical galaxy. We find a weak correlation between the radio luminosity of the AGN and the X-ray luminosity of the halo suggesting that the AGN contributes to energy deposition into the intragroup medium. We only find a correlation between the radio and optical luminosity of the central elliptical galaxy when we include X-ray-selected, elliptically dominated non-fossil groups, indicating a weak relationship between AGN strength and the mass assembly history of the groups. The dominant elliptical galaxy of fossil groups is on average roughly an order of magnitude more luminous than normal group elliptical galaxies in optical, X-ray, and radio luminosities and our findings are consistent with previous results that the radio-loud fraction in elliptical galaxies is linked to the stellar mass of a population. The current level of activity in fossil groups suggests that AGN fueling continues long after the last major merger. We discuss several possibilities for fueling the AGN at the present epoch.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - galaxies: formation - galaxies: groups: general - radio continuum: galaxies

CDS comments: RX J13040.6+4018 is a misprint for RX J1340.6+4018.

Simbad objects: 63

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Number of rows : 63
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 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
2 7C 074905.70+460420.00 BLL 07 52 44.2077683088 +45 56 57.426578736   17.95 16.93     ~ 125 1
3 7C 080418.60+340933.00 Bla 08 07 30.749 +34 00 41.70       15.8   ~ 20 1
4 SDSS J084257.55+362159.2 BiC 08 42 57.557 +36 21 59.25   20.48   17.95   ~ 24 1
5 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
6 MCXC J0844.9+4258 ClG 08 44 44.12 +43 01 07.6           ~ 27 1
7 LEDA 2209529 G 08 44 49.0835000400 +42 56 42.208390248           ~ 7 1
8 PSZRX G198.35+39.78 GrG 09 03 03.1 +27 39 29           ~ 9 0
9 SDSS J090303.18+273929.3 GiC 09 03 03.19 +27 39 29.4           ~ 5 1
10 [SMS2007] 8 GrG 09 48 29.0 +49 55 07           ~ 7 0
11 SDSS J094829.04+495506.7 GiC 09 48 29.04 +49 55 06.8           ~ 5 1
12 2dFGRS TGN431Z233 BiC 10 43 02.5696698696 +00 54 18.263016072   17.704   16.082   ~ 12 1
13 [SMS2007] 9 GrG 10 43 02.60 +00 54 18.3           ~ 7 0
14 PSZ1 G151.62+54.78 ClG 10 54 52.0 +55 21 12           ~ 22 0
15 NVSS J105452+552111 rG 10 54 52.024 +55 21 12.25           ~ 12 2
16 1RXS J112154.2+104936 GrG 11 21 55.2 +10 49 23           ~ 10 1
17 2MASS J11215524+1049230 Sy2 11 21 55.246 +10 49 23.08   21.50 20.23     ~ 11 2
18 NVSS J114128+055828 rG 11 41 28.299 +05 58 29.48           ~ 9 1
19 1RXS J114128.4+055827 GrG 11 41 28.4 +05 58 27           ~ 7 0
20 FIRST J114647.5+095228 rG 11 46 47.571 +09 52 28.17   19.3       ~ 16 2
21 ACT-CL J1146.7+0952 GrG 11 46 47.60 +09 52 28.2           ~ 17 0
22 [SMS2007] 15 GrG 11 48 03.80 +56 54 25.6           ~ 7 0
23 2MASS J11480381+5654257 BiC 11 48 03.8121754584 +56 54 25.666355844   16.49       ~ 11 1
24 [SMS2007] 16 GrG 11 49 15.0 +48 11 05           ~ 10 0
25 SDSS J124742.07+413137.6 BiC 11 49 15.0407756136 +48 11 04.910587224           ~ 5 1
26 SDSS J114915.02+481104.9 BiC 11 49 15.0407756136 +48 11 04.910587224           ~ 8 1
27 [SMS2007] 17 GrG 12 47 41.7 +41 31 43           ~ 10 0
28 1RXS J130007.7+444251 GrG 13 00 07.7 +44 42 51           ~ 5 0
29 SDSS J130009.36+444301.3 BiC 13 00 09.37 +44 43 01.3           ~ 3 1
30 NVSS J133559-033124 rG 13 35 59.9693018736 -03 31 29.074028232   17.81   16.14   ~ 15 1
31 ClG J1336-0331 GrG 13 36 00.00 -03 31 29.2           ~ 14 0
32 NAME RX J1340.6+4018 Group ClG 13 40 33.5 +40 17 46           ~ 30 1
33 NSC J141011+414538 GrG 14 09 59.94 +41 46 04.3           ~ 15 0
34 2MASX J14100418+4145208 BiC 14 10 04.1844676056 +41 45 20.903056812   12.36   10.73   ~ 18 1
35 [SMS2007] 21 GrG 14 45 16.2 +00 39 18           ~ 4 0
36 RX J1445.2+0039 BLL 14 45 16.87728 +00 39 34.0992   20.1   17.5   ~ 15 1
37 [SMS2007] 22 GrG 14 53 59.0 +48 24 17           ~ 9 0
38 2MASXI J1453590+482417 LSB 14 53 59.0123026824 +48 24 17.101029672   15.20   13.03   ~ 8 1
39 2MASX J15294628+4408044 BiC 15 29 46.272 +44 08 04.26   14.05   13.08   ~ 9 1
40 PSZRX G071.71+54.07 GrG 15 29 46.29 +44 08 04.2           ~ 14 0
41 ACT-CL J1533.7+0336 GrG 15 33 44.10 +03 36 57.5           ~ 13 0
42 GSC2 N10201114398 BiC 15 33 44.1327835632 +03 36 57.562188444   19.6   16.18   ~ 6 1
43 ACO 2110 ClG 15 39 39.82 +30 42 27.9           ~ 83 0
44 NVSS J153950+304306 rG 15 39 50.7824102760 +30 43 04.029586680   12.88   10.77   ~ 30 2
45 Z 78-79 BiC 15 48 55.854 +08 50 44.36   15.4       ~ 21 1
46 RX J1548.9+0851 GrG 15 48 55.90 +08 50 44.4           ~ 13 0
47 ACO 2165 GrG 16 14 09 +26 40.5           ~ 26 0
48 2MASX J16143111+2643504 BiC 16 14 31.1101696200 +26 43 50.334985452   15.89   13.24   ~ 9 1
49 LEDA 2177069 LIN 16 37 20.520 +41 11 20.19 18.21         ~ 27 1
50 1RXS J163721.3+411106 GrG 16 37 21.3 +41 11 06           ~ 5 0
51 RX J1647.0+3850 Bla 16 47 02.0751833280 +38 50 04.254723204   16.09   13.88   ~ 6 0
52 [SMS2007] 29 GrG 16 47 02.1 +38 50 04           ~ 6 0
53 ZwCl 1717+5636 ClG 17 18 09.272 +56 40 00.02           ~ 53 1
54 6C 171719+564300 Sy2 17 18 11.9464508952 +56 39 56.106318384   19.01 18.28     ~ 23 3
55 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 284 0
56 NVSS J172010+263731 rG 17 20 10.040 +26 37 32.06   20.4       ~ 33 2
57 1RXS J172850.5+551622 GrG 17 28 50.5 +55 16 22           ~ 5 0
58 LEDA 2496563 G 17 28 52.1692967760 +55 16 40.859635548   16.88   15.12   ~ 3 1
59 1RXS J225629.8-003231 GrG 22 56 29.8 -00 32 31           ~ 4 0
60 LEDA 3334237 rG 22 56 30.0459747168 -00 32 10.795802856   18.0   16.1   ~ 7 1
61 1RXS J235814.4+150524 GrG 23 58 14.4 +15 05 24           ~ 9 0
62 GSC2 N00012134983 BiC 23 58 15.108 +15 05 43.60   16.05   14.08   ~ 7 1
63 [SMS2007] 1 GrG ~ ~           ~ 5 0

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