2013MNRAS.433..825L

Query : 2013MNRAS.433..825L

2013MNRAS.433..825L - Mon. Not. R. Astron. Soc., 433, 825-837 (2013/July-3)

The importance of major mergers in the build up of stellar mass in brightest cluster galaxies at z = 1.

LIDMAN C., IACOBUTA G., BAUER A.E., BARRIENTOS L.F., CERULO P., COUCH W.J., DELAYE L., DEMARCO R., ELLINGSON E., FALOON A.J., GILBANK D., HUERTAS-COMPANY M., MEI S., MEYERS J., MUZZIN A., NOBLE A., NANTAIS J., RETTURA A., ROSATI P., SANCHEZ-JANSSEN R., STRAZZULLO V., WEBB T.M.A., WILSON G., YAN R. and YEE H.K.C.

Abstract (from CDS):

Recent independent results from numerical simulations and observations have shown that brightest cluster galaxies (BCGs) have increased their stellar mass by a factor of almost 2 between z ∼ 0.9 and z ∼ 0.2. The numerical simulations further suggest that more than half this mass is accreted through major mergers. Using a sample of 18 distant galaxy clusters with over 600 spectroscopically confirmed cluster members between them, we search for observational evidence that major mergers do play a significant role. We find a major merger rate of 0.38±0.14 mergers perGyr at z ∼ 1. While the uncertainties, which stem from the small size of our sample, are relatively large, our rate is consistent with the results that are derived from numerical simulations. If we assume that this rate continues to the present day and that half of the mass of the companion is accreted on to the BCG during these mergers, then we find that this rate can explain the growth in the stellar mass of the BCGs that is observed and predicted by simulations. Major mergers therefore appear to be playing an important role, perhaps even the dominant one, in the build up of stellar mass in these extraordinary galaxies.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: high-redshift

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 SpARCS J003442-430752 ClG 00 34 42.0860 -43 07 53.360           ~ 12 0
2 SpARCS J003550-431224 ClG 00 35 50.0 -43 12 24           ~ 31 0
3 PSZSPT J0036-4411 ClG 00 36 45.0390 -44 10 49.911           ~ 17 0
4 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 258 3
5 ACT-CL J0215.3-0343 ClG 02 15 23.99 -03 43 32.2           ~ 35 0
6 RCS J022056-0333.3 ClG 02 20 55 -03 33.5           ~ 19 0
7 XLSSC 046 ClG 02 23 03.0 -04 36 22           ~ 37 0
8 SpARCS J104737+574137 ClG 10 47 37.4630 +57 41 37.960           ~ 13 0
9 SpARCS J105111+581803 ClG 10 51 11.2320 +58 18 03.128           ~ 20 0
10 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6645 0
11 NAME XMMU J1229.4+0151 ClG 12 29 28.8 +01 51 34           ~ 27 0
12 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 156 0
13 SpARCS J161315+564930 ClG 16 13 14.60 +56 49 29.9           ~ 14 0
14 SpARCS J161641+554513 ClG 16 16 41.30 +55 45 12.5           ~ 22 0
15 SpARCS J163437+402149 ClG 16 34 35.0 +40 21 51           ~ 23 0
16 SpARCS J163852+403843 ClG 16 38 52.0 +40 38 43           ~ 25 0
17 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 101 0
18 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 147 0
19 ClG J2319+0038 ClG 23 19 53 +00 38.0           ~ 38 1
20 RCS J2345.4-3632 ClG 23 45 27.3 -36 32 50           ~ 15 0

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