2010AJ....139..580R


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET13:46:40

2010AJ....139..580R - Astron. J., 139, 580-593 (2010/February-0)

Infall regions and scaling relations of X-ray selected groups.

RINES K. and DIAFERIO A.

Abstract (from CDS):

We use the Fifth Data Release of the Sloan Digital Sky Survey (SDSS) to study X-ray-selected galaxy groups and compare their properties to clusters. We search for infall patterns around the groups and use these to measure group mass profiles to large radii. In previous work, we analyzed infall patterns for an X-ray-selected sample of 72 clusters from the ROSAT All-Sky Survey. Here, we extend this approach to a sample of systems with smaller X-ray fluxes selected from the 400 deg2 serendipitous survey of clusters and groups in ROSAT pointed observations. We identify 16 groups with SDSS DR5 spectroscopy, search for infall patterns, and compute mass profiles out to 2-6 h–1 Mpc from the group centers with the caustic technique. No other mass estimation methods are currently available at such large radii for these low-mass groups, because the virial estimate requires dynamical equilibrium and the gravitational lensing signal is too weak. Despite the small masses of these groups, most display recognizable infall patterns. We use caustic and virial mass estimates to measure the scaling relations between different observables, extending these relations to smaller fluxes and luminosities than many previous surveys. Close inspection reveals that three of the groups are subclusters in the outskirts of larger clusters. A fourth group is apparently undergoing a group-group merger. These four merging groups represent the most extreme outliers in the scaling relations. Excluding these groups, we find LX∝ σ3.1±1.6p, consistent with previous determinations for both clusters and groups. Understanding cluster and group scaling relations is crucial for measuring cosmological parameters from clusters. The complex environments of our group sample reinforce the idea that great care must be taken in determining the properties of low-mass clusters and groups.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: clusters: individual - galaxies: kinematics and dynamics

Simbad objects: 36

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Number of rows : 36

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 S 373 ClG 03 38 30 -35 27.3           ~ 1502 0
2 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 281 1
3 ClG J0810+4216 ClG 08 10 24.2 +42 16 19           ~ 24 0
4 MCG+09-14-024 G 08 18 30.7469203385 +56 36 32.371560370   17       ~ 9 0
5 SDSSCGA 918 CGG 08 20 26.6 +56 45 27           ~ 13 0
6 ClG J0900+3920 ClG 09 00 04.7 +39 20 24           ~ 9 0
7 MCXC J1010.2+5429 ClG 10 10 14.20 +54 29 58.0           ~ 20 0
8 MCG+10-15-099 LIN 10 32 58.839 +56 44 53.81   15.1       ~ 20 0
9 ClG J1033+5703 ClG 10 33 51.9 +57 03 11           ~ 11 0
10 ClG J1039+3947 ClG 10 39 31.3 +39 47 38           ~ 8 0
11 ACO 1139 ClG 10 58 10.98 +01 36 16.4           ~ 149 3
12 UGC 6057 BiC 10 58 10.987 +01 36 16.49   14.9       ~ 35 1
13 ClG J1159+5531 ClG 11 59 51.1 +55 31 56     15.64     ~ 84 1
14 ClG J1227+0858 ClG 12 27 14.1 +08 58 15           ~ 8 0
15 ACO 1541 ClG 12 27 38.44 +08 49 16.8           ~ 84 0
16 2XMM J123627.8+122418 G 12 36 27.821 +12 24 19.15           ~ 13 0
17 ClG J1236+1240 ClG 12 36 28.6 +12 24 21           ~ 6 0
18 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 483 0
19 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1007 0
20 NGC 5129 LIN 13 24 10.001 +13 58 35.19   13.3       ~ 109 1
21 BAX 201.0418+13.9765 ClG 13 24 11.9 +13 58 45           ~ 83 0
22 NGC 5171 GiG 13 29 21.560 +11 44 06.39   14.7       ~ 48 0
23 NAME NGC 5171 Group GrG 13 29 22.3 +11 47 31     4.7     ~ 67 0
24 NGC 5176 GiG 13 29 24.950 +11 46 53.55   15.4       ~ 26 0
25 RX J1329.4+1143 ClG 13 29 27.9 +11 43 23           ~ 9 0
26 NGC 5179 LIN 13 29 30.890 +11 44 45.16   14.9       ~ 41 0
27 ClG J1343+5546 ClG 13 43 26.900 +55 46 48.30           ~ 14 0
28 ACO 1783 ClG 13 43 39.27 +55 37 53.5           ~ 42 0
29 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 760 1
30 ACO 2092 ClG 15 33 20.93 +31 09 31.7           ~ 123 0
31 ACO 2197 ClG 16 28 10.4 +40 54 26           ~ 269 0
32 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1088 1
33 ZwCl 1628+2438 ClG 16 30 15.87 +24 34 27.7           ~ 22 0
34 IC 4607 BiC 16 30 15.870 +24 34 27.66           ~ 13 0
35 BAX 247.7692+21.3672 ClG 16 31 04.9 +21 21 54           ~ 9 0
36 ClG J2137+0026 ClG 21 37 06.9 +00 26 48           ~ 12 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-13:46:40

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