2007ApJ...655...30V


Query : 2007ApJ...655...30V

2007ApJ...655...30V - Astrophys. J., 655, 30-50 (2007/January-3)

The star formation epoch of the most massive early-type galaxies.

VAN DOKKUM P.G. and VAN DER MAREL R.P.

Abstract (from CDS):

We present new spatially resolved Keck spectroscopy of early-type galaxies in three galaxy clusters at z~0.5. We focus on the fundamental plane (FP) relation and combine the kinematics with structural parameters determined from HST images. The galaxies obey clear FP relations, which are offset from the FP of the nearby Coma Cluster due to passive evolution of the stellar populations. The z~0.5 data are combined with published data for 11 additional clusters at 0.18≤z≤1.28, to determine the evolution of the mean M/LBratio of cluster galaxies with masses M≳1011 M, as implied by the FP. We find dlog(M/LB)/dz=-0.555±0.042, stronger evolution than was previously inferred from smaller samples. The observed evolution depends on the luminosity-weighted mean age of the stars in the galaxies, the IMF, selection effects due to progenitor bias, and other parameters. Assuming a normal IMF but allowing for various other sources of uncertainty, we find z*=2.01+0.22–0.17for the luminosity-weighted mean star formation epoch. The main uncertainty is the slope of the IMF in the range 1-2 M: we find z*=4.0 for a top-heavy IMF with slope x=0. The M/LBratios of the cluster galaxies are compared to those of field early-type galaxies at 0.32≤z≤1.14. Assuming that progenitor bias and the IMF do not depend on environment, we find that the present-day age of stars in massive field galaxies is 4.1%±2.0% (~0.4 Gyr) less than that of stars in massive cluster galaxies. This relatively small age difference is surprising in the context of expectations from ``standard'' hierarchical galaxy formation models and provides a constraint on the physical processes that are responsible for halting star formation in the progenitors of today's most massive galaxies.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Galaxies: Evolution - Galaxies: Formation

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 CNOC MS 0015 100876 GiC 00 18 30.139 +16 25 51.38       21.80   ~ 8 0
2 CNOC MS 0015 101001 GiC 00 18 30.8058 +16 26 17.617           ~ 9 0
3 [DG92] 8-213 GiC 00 18 32.1 +16 25 55           ~ 4 0
4 CNOC MS 0015 100914 GiC 00 18 32.5371 +16 26 00.264           ~ 13 0
5 [SDC97] j 612 GiC 00 18 32.73 +16 25 48.8           ~ 4 1
6 CNOC MS 0015 100866 GiC 00 18 32.80 +16 25 50.4           ~ 5 1
7 CNOC MS 0015 100977 GiC 00 18 33.21 +16 26 13.6           ~ 12 0
8 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 482 0
9 CNOC MS 0015 100994 BiC 00 18 33.584 +16 26 15.93           ~ 17 0
10 CNOC MS 0015 101010 GiC 00 18 33.83 +16 26 20.3           ~ 10 0
11 [DG92] 8-219 GiC 00 18 36.3 +16 26 00           ~ 4 0
12 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 611 1
13 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 245 3
14 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1890 1
15 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 410 0
16 ClG J0848+4453 ClG 08 48 34.800 +44 53 41.90           ~ 122 1
17 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 451 0
18 ClG J1226+3332 ClG 12 26 57.7 +33 32 50           ~ 198 0
19 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1854 1
20 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 151 0
21 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4375 2
22 ZwCl 1358+6245 ClG 13 59 54.3 +62 30 36     18.5     ~ 350 0
23 [WZA2016] hst14113 10 212.82758+52.21432 GiC 14 11 18.61 +52 12 51.6   23.55   21.29   ~ 8 0
24 [WZA2016] hst14113 10 212.83002+52.21587 GiC 14 11 19.20 +52 12 57.1   23.76   21.45   ~ 9 0
25 [WZA2016] hst14113 10 212.83305+52.22746 GiC 14 11 19.93 +52 13 38.8   23.15   20.71   ~ 8 0
26 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 919 5
27 [TRH94] 119 GiC 14 11 21.97 +52 11 07.6   23.26   20.73   ~ 6 0
28 ClG J1411+5211 ClG 14 11 24.4 +52 12 38     20.11     ~ 115 3
29 DES J160306.36+424515.0 GiC 16 03 06.358 +42 45 15.04           ~ 9 0
30 DES J160306.73+424642.5 GiC 16 03 06.728 +42 46 42.54           ~ 7 0
31 DES J160308.59+424431.5 GiC 16 03 08.597 +42 44 31.53           ~ 7 0
32 DES J160309.18+424605.3 GiC 16 03 09.178 +42 46 05.36           ~ 7 0
33 [DG92] 7-145 GiC 16 03 10.3787 +42 45 39.515           ~ 5 0
34 [DG92] 7-163 GiC 16 03 12.180 +42 45 24.88           ~ 8 0
35 [DG92] 7-177 GiC 16 03 12.25 +42 45 19.4           ~ 4 0
36 DES J160313.00+424551.0 GiC 16 03 13.000 +42 45 50.99           ~ 8 0
37 DES J160313.43+424510.2 GiC 16 03 13.428 +42 45 10.21           ~ 8 0
38 ClG 1601+42 ClG 16 03 13.800 +42 45 36.00           ~ 48 0
39 [DG92] 7-106 GiC 16 03 14.30 +42 46 14.1           ~ 5 0
40 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 784 1
41 ClG 2053-04 ClG 20 56 21.2 -04 37 46   21.0       ~ 163 0
42 ACO 2390 ClG 21 53 34.6 +17 40 11           ~ 642 2
43 [BR96] Cl 0016+161 438 GiC ~ ~           ~ 1 0
44 [SDC97] j 438 GiC ~ ~           ~ 2 0
45 [SDC97] g 47 GiC ~ ~           ~ 1 0

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2021.08.04-14:57:20

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