2014ApJ...794...88V

Query : 2014ApJ...794...88V

2014ApJ...794...88V - Astrophys. J., 794, 88 (2014/October-2)

X-ray-selected galaxy groups in Bootes.

VAJGEL B., JONES C., LOPES P.A.A., FORMAN W.R., MURRAY S.S., GOULDING A. and ANDRADE-SANTOS F.

Abstract (from CDS):

We present the X-ray and optical properties of the galaxy groups selected in the Chandra X-Boötes survey. We used follow-up Chandra observations to better define the group sample and their X-ray properties. Group redshifts were measured from the AGN and Galaxy Evolution Survey spectroscopic data. We used photometric data from the NOAO Deep Wide Field Survey to estimate the group richness (Ngals) and the optical luminosity (Lopt). Our final sample comprises 32 systems at z < 1.75 with 14 below z = 0.35. For these 14 systems, we estimate velocity dispersions (σgr) and perform a virial analysis to obtain the radii (R200 and R500) and total masses (M200and M500) for groups with at least 5 galaxy members. We use the Chandra X-ray observations to derive the X-ray luminosity (LX). We examine the performance of the group properties σgr, Lopt, and LX, as proxies for the group mass. Understanding how well these observables measure the total mass is important to estimate how precisely the cluster/group mass function is determined. Exploring the scaling relations built with the X-Boötes sample and comparing these with samples from the literature, we find a break in the LX-M500 relation at approximately M500= 5x1013 M☉(for M500> 5x1013 M☉, M500 ∝ LX0.61±0.02, while for M500 ≤ 5x1013 M☉, M500 ∝ LX0.44±0.005). Thus, the mass-luminosity relation for galaxy groups cannot be described by the same power law as galaxy clusters. A possible explanation for this break is the dynamical friction, tidal interactions, and projection effects that reduce the velocity dispersion values of the galaxy groups. By extending the cluster luminosity function to the group regime, we predict the number of groups that new X-ray surveys, particularly eROSITA, will detect. Based on our cluster/group luminosity function estimates, eROSITA will identify ∼1800 groups (LX= 1041-1043 erg/s) within a distance of 200 Mpc. Since groups lie in large-scale filaments, this group sample will map the large-scale structure of the local universe.

Abstract Copyright: ∼

Journal keyword(s): galaxies: groups: general - surveys - X-rays: galaxies: clusters

Nomenclature: Table 1: [VJL2014] XBS NN N=32 among (Nos 2-52), Table 2: [VJL2014] XBS NN BGG N=28 among (Nos 2-52).

Simbad objects: 61

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Number of rows : 61
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 [VJL2014] XBS 2 BGG G 14 25 32.8907099760 +32 56 37.908013812           ~ 1 0
2 [VJL2014] XBS 2 GrG 14 25 32.90 +32 56 44.0           ~ 1 0
3 [VJL2014] XBS 4 GrG 14 26 32.51 +35 08 21.0           ~ 1 0
4 [VJL2014] XBS 5 GrG 14 26 37.04 +35 27 34.0           ~ 1 0
5 [VJL2014] XBS 5 BGG G 14 26 37.2 +35 27 32           ~ 1 0
6 [VJL2014] XBS 6 GrG 14 26 57.90 +34 12 01.0           ~ 2 0
7 [VJL2014] XBS 6 BGG G 14 26 59.8 -34 12 00           ~ 1 0
8 NGC 5623 rG 14 27 08.6649857774 +33 15 08.993540267   13.53 12.53 12.86 12.16 ~ 55 1
9 [VJL2014] XBS 7 GrG 14 27 09.30 +33 15 10.0           ~ 1 0
10 2MASS J14271124+3229170 G 14 27 11.2403096568 +32 29 16.964639412       15.55 14.77 ~ 6 0
11 [VJL2014] XBS 8 GrG 14 27 13.78 +32 28 57.0           ~ 1 0
12 [VJL2014] XBS 9 BGG G 14 27 41.89 +33 12 52.0           ~ 1 0
13 [VJL2014] XBS 9 GrG 14 27 41.89 +33 12 52.0           ~ 1 0
14 [VJL2014] XBS 46 GrG 14 28 33.80 +33 05 35.0           ~ 1 0
15 [VJL2014] XBS 46 BGG G 14 28 33.8 +33 05 20           ~ 1 0
16 [VJL2014] XBS 11 BGG G 14 29 00.2172861768 +35 37 21.516278556           ~ 1 0
17 [VJL2014] XBS 11 GrG 14 29 00.60 +35 37 34.0           ~ 1 0
18 [VJL2014] XBS 13 BGG G 14 29 14.4 +33 59 23           ~ 1 0
19 [VJL2014] XBS 13 GrG 14 29 16.15 +33 59 29.0           ~ 2 0
20 [VJL2014] XBS 14 BGG G 14 29 55.7 +33 17 11           ~ 1 0
21 [VJL2014] XBS 14 GrG 14 29 55.87 +33 17 11.0           ~ 1 0
22 [VJL2014] XBS 17 GrG 14 31 09.17 +35 06 09.0           ~ 1 0
23 2MASS J14311138+3506091 AGN 14 31 11.3788373904 +35 06 09.164775024       17.35 16.63 ~ 4 0
24 [VJL2014] XBS 18 GrG 14 31 13.81 +32 32 25.0           ~ 1 0
25 2MASS J14315527+3438061 BiC 14 31 55.2574306560 +34 38 05.883113796       18.45 17.56 ~ 8 0
26 [VJL2014] XBS 20 GrG 14 31 56.12 +34 38 06.0           ~ 1 0
27 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 430 0
28 [VJL2014] XBS 21 GrG 14 32 51.50 +32 30 18.0           ~ 1 0
29 [VJL2014] XBS 22 BGG G 14 32 52.8 +33 18 22           ~ 1 0
30 [VJL2014] XBS 22 GrG 14 32 53.14 +33 18 06.0           ~ 1 0
31 CXOXB J143359.4+350951 AGN 14 33 59.5 +35 09 52       21.27 20.16 ~ 6 0
32 [VJL2014] XBS 25 GrG 14 34 27.43 +34 07 46.0           ~ 1 0
33 [VJL2014] XBS 25 BGG G 14 34 27.6 +34 07 40           ~ 1 0
34 [VJL2014] XBS 26 GrG 14 34 49.05 +35 43 01.0           ~ 1 0
35 NVSS J143449+354246 rG 14 34 49.1023344072 +35 42 47.215558980       16.32 15.59 ~ 9 0
36 [VJL2014] XBS 27 GrG 14 35 08.85 +35 03 49.0           ~ 1 0
37 [VJL2014] XBS 28 GrG 14 35 09.03 +33 30 50.0           ~ 1 0
38 [VJL2014] XBS 28 BGG G 14 35 09.1 +33 31 06           ~ 1 0
39 [VJL2014] XBS 29 GrG 14 35 11.94 +34 09 22.0           ~ 1 0
40 [VJL2014] XBS 29 BGG G 14 35 14.4 +34 08 59           ~ 1 0
41 [VJL2014] XBS 32 GrG 14 36 01.94 +34 42 26.0           ~ 1 0
42 [VJL2014] XBS 32 BGG G 14 36 04.6 +34 41 58           ~ 1 0
43 2MASS J14361370+3347170 AGN 14 36 13.6864453992 +33 47 17.083727160       18.18 17.36 ~ 4 0
44 [VJL2014] XBS 33 GrG 14 36 15.44 +33 46 50.0           ~ 1 0
45 MCG+06-32-076 G 14 36 50.7419730744 +34 17 33.668438244   15   14.78 14.36 ~ 16 0
46 [VJL2014] XBS 35 GrG 14 36 51.06 +34 17 37.0           ~ 1 0
47 2MASS J14370505+3333393 BiC 14 37 05.0587534296 +33 33 39.101103180       17.05 16.32 ~ 5 0
48 [KMA2007] 219.27108+33.56086 GrG 14 37 05.56 +33 33 44.0           ~ 5 0
49 [VJL2014] XBS 37 BGG G 14 37 07.0 +34 18 50           ~ 1 0
50 [VJL2014] XBS 37 GrG 14 37 07.06 +34 18 48.0           ~ 1 0
51 [VJL2014] XBS 38 GrG 14 37 14.35 +34 15 03.0           ~ 1 0
52 SDSS J143716.63+341505.6 AGN 14 37 16.6 +34 15 06       19.36 18.33 ~ 7 0
53 [VJL2014] XBS 39 GrG 14 37 29.18 +34 18 22.0           ~ 1 0
54 [VJL2014] XBS 39 BGG G 14 37 31.2 +34 18 35           ~ 1 0
55 [VJL2014] XBS 41 GrG 14 37 42.77 +34 08 07.0           ~ 1 0
56 [VJL2014] XBS 41 BGG G 14 37 43.0 +34 08 11           ~ 1 0
57 [VJL2014] XBS 43 BGG G 14 37 46.1 +35 06 50           ~ 1 0
58 2MASS J14374762+3331139 GiC 14 37 47.6222258784 +33 31 13.933562484       16.37 15.67 ~ 6 0
59 [VJL2014] XBS 42 GrG 14 37 47.63 +33 31 10.0           ~ 1 0
60 [VJL2014] XBS 43 GrG 14 37 48.49 +35 06 17.0           ~ 1 0
61 [VJL2014] XBS 52 GrG 14 43 35.94 +35 09 51.0           ~ 1 0

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