2012ApJ...754...97H

Query : 2012ApJ...754...97H

2012ApJ...754...97H - Astrophys. J., 754, 97 (2012/August-1)

LoCuSS: a dynamical analysis of X-ray active galactic nuclei in local clusters.

HAINES C.P., PEREIRA M.J., SANDERSON A.J.R., SMITH G.P., EGAMI E., BABUL A., EDGE A.C., FINOGUENOV A., MORAN S.M. and OKABE N.

Abstract (from CDS):

We present a study of the distribution of X-ray active galactic nuclei (AGNs) in a representative sample of 26 massive clusters at 0.15 < z < 0.30, combining Chandra observations sensitive to X-ray point sources of luminosity LX∼ 1042 erg/s at the cluster redshift with extensive and highly complete spectroscopy of cluster members down to ∼M*K+ 2. In total we identify 48 X-ray AGNs among the cluster members, with luminosities 2x1041-1 x1044 erg/s. Based on these identifications, we estimate that 0.73% ±0.14% of cluster galaxies brighter than MK= -23.1 (M*K+ 1.5) host an X-ray AGN with LX> 1042 erg/s. In the stacked caustic diagram that shows (vlos- )/σv versus rproj/r500, the X-ray AGN appear to preferentially lie along the caustics, suggestive of an infalling population. They also appear to avoid the region with lowest cluster-centric radii and relative velocities (rproj< 0.4r500;|v - |/σv< 0.8), which is dominated by the virialized population of galaxies accreted earliest into the clusters. The line-of-sight velocity histogram of the X-ray AGN shows a relatively flat distribution, and is inconsistent with the Gaussian distribution expected for a virialized population at 98.9% confidence. Moreover, the velocity dispersion of the 48 X-ray AGNs is 1.51 times that of the overall cluster population, which is consistent with the sqrt(2) ratio expected by simple energetic arguments when comparing infalling versus virialized populations. This kinematic segregation is significant at the 4.66σ level. When splitting the X-ray AGN sample into two according to X-ray or infrared (IR) luminosity, both X-ray bright (LX> 1042) and IR-bright (LTIR> 2x1010 L☉) subsamples show higher velocity dispersions than their X-ray dim and IR-dim counterparts at >2σ significance. This is consistent with the nuclear activity responsible for the X-ray and IR emission being slowly shut down as the host galaxies are accreted into the cluster. Overall, our results provide the strongest observational evidence to date that X-ray AGNs found in massive clusters are an infalling population, and that the cluster environment very effectively suppresses radiatively efficient nuclear activity in its member galaxies. These results are consistent with the view that for galaxies to host an X-ray AGN they should be the central galaxy within their dark matter halo and have a ready supply of cold gas.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: clusters: general - galaxies: evolution - galaxies: stellar content

Nomenclature: Table 2: [HPS2012] JHHMMSS.sss+DDMMSS.ss N=48

Simbad objects: 85

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Number of rows : 85
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 68 ClG 00 37 06.2 +09 09 33           ~ 195 0
2 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
3 ACO 115 ClG 00 55 59 +26 23.2           ~ 295 1
4 [BHG83] G 28 GiC 00 55 59.0089786296 +26 20 48.875034372     19.79     ~ 6 0
5 [BHG83] G 2 rG 00 56 02.2666390512 +26 27 28.678523328     21.68     ~ 16 0
6 LEDA 138272 rG 00 56 08.6486575872 +26 25 10.824907980   20.13   17.35   ~ 11 0
7 [BBG2007b] 85 GiC 00 56 11.4240321696 +26 27 37.261525284   20.87   18.76   ~ 2 0
8 2MASX J00561966+2621525 GiC 00 56 19.7039452416 +26 21 53.180692200   19.04   16.33   ~ 10 0
9 ZwCl 0104+0048 ClG 01 06 50.5 +01 04 10           ~ 67 0
10 [MBM2004] 1 GiC 01 31 33.7967846160 -13 32 23.202751992     18.32     ~ 4 0
11 [HPS2012] J013150.568-133000.38 QSO 01 31 50.568 -13 30 00.38           ~ 1 0
12 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 326 0
13 [HPS2012] J013216.328-133538.15 AGN 01 32 16.328 -13 35 38.15           ~ 1 0
14 ClG J0142+2131 ClG 01 42 03.1 +21 30 39           ~ 60 1
15 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
16 SDSS J015259.12+005705.1 AGN 01 52 59.129 +00 57 05.10           ~ 3 0
17 ACO 291 ClG 02 01 42.9 -02 11 48           ~ 72 0
18 ACO 383 ClG 02 48 03.3915 -03 31 45.228           ~ 389 0
19 SDSS J024821.90-033425.5 AGN 02 48 21.9104614680 -03 34 25.517513532           ~ 5 0
20 SDSS J024824.68-033145.6 AGN 02 48 24.6907495200 -03 31 45.566346468           ~ 4 0
21 ACO 3125 ClG 03 27 22 -53 30.6           ~ 57 2
22 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
23 [CLS2005] C171-3650 GiC 07 32 17.0301625440 +31 36 50.424434316           ~ 2 0
24 ACO 586 ClG 07 32 20.3 +31 37 58           ~ 196 0
25 LEDA 1959375 AGN 07 32 20.3159849664 +31 41 20.649837480           ~ 6 0
26 2MASS J08005289+3606262 AGN 08 00 52.9117878600 +36 06 26.121290436           ~ 3 0
27 [HPS2012] J080056.472+360525.02 AGN 08 00 56.479 +36 05 24.97           ~ 3 0
28 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
29 SDSS J080102.22+360245.6 QSO 08 01 02.229 +36 02 45.73           ~ 3 0
30 [HPS2012] J080104.616+360221.21 AGN 08 01 04.619 +36 02 21.08           ~ 3 0
31 [HPS2012] J080106.125+360316.83 AGN 08 01 06.120 +36 03 16.66           ~ 3 0
32 ZwCl 0823+0425 ClG 08 25 57.8 +04 14 48           ~ 42 0
33 [HPS2012] J082933.864+655059.12 EmG 08 29 33.8607698568 +65 50 59.149360824           ~ 1 0
34 2MASX J08304161+6558102 rG 08 30 41.6361447504 +65 58 10.602213888           ~ 5 0
35 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
36 2MASX J08305602+6558192 GiC 08 30 55.9783636200 +65 58 19.075077912           ~ 3 0
37 ACO 689 ClG 08 37 29 +14 59.5           ~ 53 0
38 [HPS2012] J084251.963+292825.02 SyG 08 42 51.9761932824 +29 28 25.076398188           ~ 4 0
39 ZwCl 0839+2937 ClG 08 42 55.9 +29 27 26     17.0     ~ 93 0
40 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
41 ZwCl 0857+2107 ClG 09 00 36.90 +20 53 40.3           ~ 103 0
42 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
43 ACO 901 ClG 09 56 09.7 -09 56 17           ~ 113 1
44 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
45 2XMM J101700.6+390432 QSO 10 17 00.7142335728 +39 04 32.758195944           ~ 5 0
46 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
47 SDSS J131116.98-011656.6 AGN 13 11 16.981 -01 16 56.63           ~ 4 0
48 SDSS J131122.15-012345.6 G 13 11 22.15203 -01 23 45.6159           ~ 23 0
49 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
50 APMUKS (BJ) B130901.41-010417.1 Sy1 13 11 35.6172052632 -01 20 12.178072104   19.75 18.82 18.34 18.84 ~ 15 0
51 2dFGRS TGN259Z043 AGN 13 11 45.4493052048 -01 23 36.085315848   19.94 18.42 16.84 16.23 ~ 10 0
52 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
53 [HPS2012] J133244.206+503107.82 AGN 13 32 44.206 +50 31 07.82           ~ 2 0
54 2MASS J13351838+4059502 AGN 13 35 18.381 +40 59 50.28   20.1       ~ 6 0
55 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 335 0
56 FIRST J133542.0+410221 rG 13 35 42.0510592728 +41 02 21.694452972           ~ 3 0
57 2MASS J14004825+0247025 AGN 14 00 48.2772886224 +02 47 02.433886440           ~ 6 0
58 SDSS J140051.29+025905.3 Sy2 14 00 51.2993733216 +02 59 05.347203792           ~ 18 0
59 SDSS J140054.13+025223.4 AGN 14 00 54.139 +02 52 23.38           ~ 4 0
60 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
61 [HPS2012] J140108.836+024457.67 AGN 14 01 08.836 +02 44 57.67           ~ 1 0
62 SDSS J140116.14+024513.1 AGN 14 01 16.154 +02 45 13.22           ~ 7 0
63 1RXS J140125.2+025617 Sy1 14 01 27.6951898560 +02 56 06.086734152   20.60 19.91     ~ 25 0
64 [RGD2013] J142546.635+374924.455 AGN 14 25 46.6396118832 +37 49 24.457753272           ~ 2 0
65 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
66 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
67 NVSS J163546+661447 rG 16 35 47.3321206104 +66 14 44.487530016   20.105 18.517     ~ 16 0
68 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
69 [RS2005] ACO 2218 337 G 16 35 56.090 +66 16 15.13           ~ 2 0
70 [RS2005] ACO 2218 476 G 16 36 30.9119489976 +66 15 05.273644140           ~ 2 0
71 [HPS2012] J164005.839+464341.43 AGN 16 40 05.839 +46 43 41.43           ~ 1 0
72 [HPS2012] J164009.337+464419.55 AGN 16 40 09.337 +46 44 19.55           ~ 1 0
73 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
74 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 284 0
75 ACO 2345 ClG 21 27 05.391 -12 09 07.41           ~ 151 0
76 NVSS J212709-120958 Rad 21 27 09.27 -12 10 01.5           ~ 132 1
77 ClG J2129+0005 ClG 21 29 40.5 +00 05 47           ~ 308 0
78 [GCF2004] ACO 2390 10 GiC 21 53 25.330 +17 43 21.75   22.39       ~ 5 0
79 CNOC ACO 2390 101033 GiC 21 53 31.422 +17 41 33.68           ~ 8 0
80 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
81 SDSS J215337.97+174347.3 GiC 21 53 37.972 +17 43 47.46           ~ 6 0
82 2MASS J21534555+1741477 Sy2 21 53 45.5580293976 +17 41 47.804531064   20.26       ~ 12 0
83 SDSS J215345.74+174108.3 rG 21 53 45.738 +17 41 08.46           ~ 7 0
84 2MASS J22483081-1610314 AGN 22 48 30.8206229592 -16 10 31.031987700           ~ 1 0
85 ACO 2485 ClG 22 48 33 -16 07.1           ~ 53 0

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