2003ApJ...596..143L

Query : 2003ApJ...596..143L

2003ApJ...596..143L - Astrophys. J., 596, 143-158 (2003/October-2)

The star-forming dwarf galaxy populations of two z ∼ 0.4 clusters: MS 1512.4+3647 and A851.

LOTZ J.M., MARTIN C.L. and FERGUSON H.C.

Abstract (from CDS):

We present the results of a deep narrowband [O II] λ3727 emission line search for faint (g<27), star-forming galaxies in the field of the z=0.37 MS 1512.4+3647 cluster. We find no evidence for an overdensity of emission-line sources relative to the field at z∼0.4 and therefore conclude that the MS 1512.4+3647 sample is dominated by field [O II] emission line galaxies that lie along the ∼180 Mpc line of sight immediately in front of and behind the cluster. This is surprising, given that the previously surveyed z=0.41 cluster A851 has 3-4 times the field emission-line galaxy density. We find that the MS 1512.4+3647 sample is deficient in galaxies with intermediate colors (1.0<g-i<2.0) and implied star formation exponential decay timescales τ∼100 Myr-1 Gyr that dominate the A851 emission-line galaxy population. Instead, the majority of [O II] emission line galaxies surrounding the MS 1512.4+3647 cluster are blue (g-i≤1.0) and forming stars in bursts with τ<100 Myr. In both samples, galaxies with the shortest star formation timescales are preferentially among the faintest star-forming objects. Their i luminosities are consistent with young stellar populations ∼108-109 M☉, although an additional factor of 10 in stellar mass could be hiding in underlying old stellar populations. We discuss the implications for the star formation histories of dwarf galaxies in the field and rich clusters.

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Journal keyword(s): Galaxies: Clusters: Individual: Alphanumeric: A851 - Galaxies: Clusters: Individual: Alphanumeric: MS 1512.4+3647 - Galaxies: High-Redshift

Nomenclature: Tables 1-4: [LMF2003] NNNN N=36+3+2+68 among (Nos 72-2823).

Simbad objects: 109

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Number of rows : 109
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 ZwCl 0024+1652 ClG 00 26 35.6 +17 09 32     18.35     ~ 648 1
2 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
3 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
4 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
5 [LMF2003] 596 G 15 13 55.50 +36 32 29.8           ~ 1 0
6 [LMF2003] 2349 G 15 13 55.53 +36 36 15.8           ~ 1 0
7 [LMF2003] 1627 G 15 13 56.77 +36 41 59.4           ~ 1 0
8 [LMF2003] 1687 G 15 13 57.74 +36 42 13.3           ~ 1 0
9 CNOC MS 1512 100396 GiC 15 13 58.95 +36 34 32.5           ~ 1 0
10 CNOC MS 1512 100824 GiC 15 13 59.49 +36 36 10.8           ~ 1 0
11 [LMF2003] 631 G 15 14 00.54 +36 32 42.9           ~ 1 0
12 [LMF2003] 498 G 15 14 00.97 +36 32 15.7           ~ 1 0
13 [LMF2003] 413 G 15 14 01.55 +36 31 56.4           ~ 1 0
14 [LMF2003] 1636 G 15 14 02.85 +36 42 01.7           ~ 1 0
15 [LMF2003] 724 G 15 14 03.09 +36 33 10.2           ~ 1 0
16 [LMF2003] 672 G 15 14 03.32 +36 32 51.0           ~ 1 0
17 CNOC MS 1512 100769 EmG 15 14 07.4689 +36 35 30.599           ~ 2 0
18 [LMF2003] 2037 G 15 14 08.57 +36 34 55.9           ~ 1 0
19 [LMF2003] 160 G 15 14 09.22 +36 30 40.3           ~ 1 0
20 [LMF2003] 2612 G 15 14 09.68 +36 37 11.6           ~ 1 0
21 CNOC MS 1512 100600 GiC 15 14 09.9697 +36 35 02.999           ~ 2 0
22 [LMF2003] 1696 G 15 14 10.55 +36 42 17.4           ~ 1 0
23 [LMF2003] 1013 G 15 14 10.70 +36 39 02.0           ~ 1 0
24 [LMF2003] 135 G 15 14 11.03 +36 30 39.1           ~ 1 0
25 [LMF2003] 1042 G 15 14 11.64 +36 39 07.4           ~ 1 0
26 CNOC MS 1512 100508 GiC 15 14 13.1503 +36 34 46.899           ~ 2 0
27 [LMF2003] 2633 G 15 14 13.61 +36 37 17.2           ~ 1 0
28 [LMF2003] 517 G 15 14 14.73 +36 32 17.9           ~ 1 0
29 CNOC MS 1512 101250 GiC 15 14 14.9881 +36 36 56.699           ~ 2 0
30 [LMF2003] 2024 G 15 14 14.99 +36 34 52.4           ~ 1 0
31 [LMF2003] 2136 G 15 14 15.03 +36 35 21.9           ~ 1 0
32 CNOC MS 1512 100815 GiC 15 14 15.3151 +36 35 39.599           ~ 2 0
33 [LMF2003] 542 G 15 14 16.07 +36 32 18.5           ~ 1 0
34 [LMF2003] 1933 G 15 14 16.36 +36 34 29.2           ~ 1 0
35 [LMF2003] 1262 BiC 15 14 16.386 +36 40 09.79           ~ 2 0
36 [LMF2003] 1438 G 15 14 16.63 +36 41 03.7           ~ 1 0
37 CNOC MS 1512 102377 GiC 15 14 16.9992 +36 40 38.399           ~ 2 0
38 [LMF2003] 1909 G 15 14 17.14 +36 34 21.2           ~ 1 0
39 CNOC MS 1512 100817 GiC 15 14 17.6898 +36 35 39.999           ~ 2 0
40 [LMF2003] 749 G 15 14 18.43 +36 33 13.5           ~ 1 0
41 CNOC MS 1512 100355 GiC 15 14 18.8211 +36 34 19.399           ~ 2 0
42 [LMF2003] 2823 G 15 14 19.05 +36 38 09.9           ~ 1 0
43 CNOC MS 1512 100710 GiC 15 14 19.7495 +36 35 20.599     21.49     ~ 3 0
44 CNOC MS 1512 100586 GiC 15 14 19.8330 +36 35 00.399           ~ 2 0
45 [LMF2003] 2565 G 15 14 20.31 +36 37 01.1           ~ 1 0
46 [ZB97] M15 GiC 15 14 20.8291 +36 35 08.599           ~ 3 0
47 [LMF2003] 1515 G 15 14 21.01 +36 41 24.8           ~ 1 0
48 CNOC MS 1512 100370 EmG 15 14 21.3281 +36 34 22.299           ~ 2 0
49 CNOC MS 1512 1000142 GiC 15 14 21.35 +36 33 36.7           ~ 1 0
50 [LMF2003] 1951 GiC 15 14 21.3623 +36 34 33.162           ~ 2 0
51 [LMF2003] 2437 G 15 14 21.74 +36 36 13.3           ~ 1 0
52 CNOC MS 1512 100318 GiC 15 14 21.7515 +36 34 14.099           ~ 2 0
53 ClG J1514+3636 ClG 15 14 22.0 +36 36 22     19.0     ~ 136 0
54 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 326 0
55 FIRST J151422.4+363620 rG 15 14 22.482 +36 36 21.08           ~ 146 1
56 CNOC MS 1512 100613 GiC 15 14 22.5312 +36 35 04.499           ~ 2 0
57 CNOC MS 1512 101401 GiC 15 14 22.6540 +36 37 24.899           ~ 2 0
58 CNOC MS 1512 101397 GiC 15 14 23.6924 +36 37 24.099           ~ 2 0
59 [LMF2003] 2218 G 15 14 23.70 +36 35 41.3           ~ 1 0
60 [LMF2003] 1107 G 15 14 23.70 +36 39 26.8           ~ 1 0
61 [LMF2003] 1492 G 15 14 23.70 +36 41 20.0           ~ 1 0
62 [LMF2003] 949 G 15 14 24.01 +36 38 43.5           ~ 1 0
63 CNOC MS 1512 100142 EmG 15 14 24.6072 +36 33 44.199           ~ 2 0
64 [LMF2003] 2164 G 15 14 24.69 +36 35 28.2           ~ 1 0
65 CNOC MS 1512 101534 GiC 15 14 24.7223 +36 37 52.099           ~ 2 0
66 [LMF2003] 1035 G 15 14 24.84 +36 39 02.5           ~ 1 0
67 CNOC MS 1512 100191 EmG 15 14 25.0055 +36 33 51.899           ~ 2 0
68 [LMF2003] 992 G 15 14 25.52 +36 38 57.2           ~ 1 0
69 CNOC MS 1512 100082 GiC 15 14 25.6281 +36 33 32.999           ~ 2 0
70 [LMF2003] 1074 G 15 14 25.66 +36 39 07.5           ~ 1 0
71 [LMF2003] 1599 G 15 14 27.09 +36 41 51.9           ~ 1 0
72 [LMF2003] 769 G 15 14 28.05 +36 33 20.1           ~ 1 0
73 [LMF2003] 821 G 15 14 28.32 +36 33 31.3           ~ 1 0
74 SDSS J151429.42+363954.5 G 15 14 29.42779 +36 39 54.6200           ~ 2 0
75 [LMF2003] 825 GiC 15 14 29.7034 +36 33 44.899           ~ 2 0
76 SDSS J151430.34+363027.6 QSO 15 14 30.349 +36 30 27.62           ~ 2 0
77 CNOC MS 1512 101164 GiC 15 14 30.3868 +36 36 40.799           ~ 2 0
78 CNOC MS 1512 100161 EmG 15 14 30.4753 +36 33 47.399           ~ 2 0
79 CNOC MS 1512 102080 GiC 15 14 30.5558 +36 39 35.999           ~ 2 0
80 [LMF2003] 120 G 15 14 30.60 +36 30 30.0           ~ 1 0
81 [LMF2003] 2340 G 15 14 33.25 +36 36 11.3           ~ 1 0
82 [LMF2003] 186 G 15 14 33.30 +36 30 50.1           ~ 1 0
83 CNOC MS 1512 100486 GiC 15 14 35.2581 +36 34 43.999           ~ 2 0
84 [LMF2003] 156 G 15 14 36.16 +36 30 42.1           ~ 1 0
85 [LMF2003] 499 G 15 14 36.24 +36 32 11.2           ~ 1 0
86 [LMF2003] 2324 G 15 14 36.89 +36 36 07.4           ~ 1 0
87 [LMF2003] 1459 G 15 14 37.24 +36 41 05.0           ~ 1 0
88 CNOC MS 1512 101290 GiC 15 14 38.4938 +36 37 03.799           ~ 2 0
89 [LMF2003] 72 G 15 14 39.55 +36 30 20.3           ~ 1 0
90 CNOC MS 1512 101698 GiC 15 14 39.7021 +36 38 23.899           ~ 2 0
91 [LMF2003] 2825 G 15 14 40.16 +36 38 09.5           ~ 1 0
92 CNOC MS 1512 101819 GiC 15 14 40.2683 +36 38 46.299           ~ 2 0
93 [LMF2003] 616 G 15 14 40.46 +36 32 40.7           ~ 1 0
94 [LMF2003] 1305 G 15 14 43.43 +36 40 27.5           ~ 1 0
95 [LMF2003] 1075 G 15 14 43.57 +36 39 19.7           ~ 1 0
96 [LMF2003] 1384 G 15 14 44.04 +36 40 45.2           ~ 1 0
97 CNOC MS 1512 100158 GiC 15 14 44.9010 +36 33 47.199           ~ 2 0
98 [VV98] J151447.0+364150 QSO 15 14 47.0464101096 +36 41 50.203874076   20.01 19.57     ~ 10 0
99 CNOC MS 1512 102063 EmG 15 14 47.3013 +36 39 32.999           ~ 2 0
100 [LMF2003] 1574 G 15 14 48.01 +36 41 38.6           ~ 1 0
101 CNOC MS 1512 102166 EmG 15 14 49.5884 +36 39 53.099           ~ 2 0
102 [LMF2003] 416 G 15 14 49.79 +36 31 50.7           ~ 1 0
103 [LMF2003] 1441 G 15 14 52.55 +36 41 00.2           ~ 1 0
104 [LMF2003] 2280 GiC ~ ~     21.74     ~ 2 0
105 CNOC MS 1512 100377 GiC ~ ~           ~ 1 0
106 CNOC MS 1512 100972 GiC ~ ~           ~ 1 0
107 [LMF2003] 2346 GiC ~ ~     20.94     ~ 2 0
108 [LMF2003] 2440 GiC ~ ~     21.38     ~ 2 0
109 NAME Local Group GrG ~ ~           ~ 9325 0

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