2010A&A...509A..83D


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.17CET14:36:21

2010A&A...509A..83D - Astronomy and Astrophysics, volume 509, A83-83 (2010/1-1)

Optical and near-IR spectroscopy of candidate red galaxies in two z ∼ 2.5 proto-clusters.

DOHERTY M., TANAKA M., DE BREUCK C., LY C., KODAMA T., KURK J., SEYMOUR N., VERNET J., STERN D., VENEMANS B., KAJISAWA M. and TANAKA I.

Abstract (from CDS):

We present a spectroscopic campaign to follow-up red colour-selected candidate massive galaxies in two high redshift proto-clusters surrounding radio galaxies. We observed a total of 57 galaxies in the field of MRC 0943-242 (z=2.93) and 33 in the field of MRC 1138-262 (z=2.16) with a mix of optical and near-infrared multi-object spectroscopy. We confirm two red galaxies in the field of MRC 1138-262 at the redshift of the radio galaxy. Based on an analysis of their spectral energy distributions, and their derived star formation rates from the Hα and observed frame 24µm flux, one object belongs to the class of dust-obscured star-forming red galaxies, while the other is evolved with little ongoing star formation. This result represents the first red and mainly passively evolving galaxy to be confirmed as companion galaxies in a z>2 proto-cluster. Both red galaxies in MRC 1138-262 are massive, of the order of 4-6x1011M. They lie along a colour-magnitude relation which implies that they formed the bulk of their stellar population around z=4. In the MRC 0943-242 field we find no red galaxies at the redshift of the radio galaxy but we do confirm the effectiveness of our JHKs selection of galaxies at 2.3<z<3.1, finding that 10 out of 18 (56%) of JHKs-selected galaxies whose redshifts could be measured fall within this redshift range. We also serendipitously identify an interesting foreground structure of 6 galaxies at z=2.6 in the field of MRC 0943-242. This may be a proto-cluster itself, but complicates any interpretation of the red sequence build-up in MRC 0943-242 until more redshifts can be measured.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: MRC 1138-262 - galaxies: clusters: individual: MRC 0943-242 - galaxies: evolution - galaxies: high-redshift - large-scale structure of Universe - infrared: galaxies

Nomenclature: Table 2: [DTD2010] MRC 0943-242 NNN N=56 among (Nos 16-897), [DTD2010] MRC 0943-242 HzRG N=1, [DTD2010] MRC 0943-242 LAENNNN (Nos 381, 1141, 1618). Table 3: [DTD2010] MRC 1138-262 NNN N=33 among (Nos 90-905), [DTD2010] JHHMMSS.ss+DDMMSS.s N=2.

Simbad objects: 98

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Number of rows : 98

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 [DTD2010] MRC 0943-242 897 G 09 45 25.34 -24 25 40.3           ~ 1 0
2 [DTD2010] MRC 0943-242 420 G 09 45 25.57 -24 28 59.8           ~ 1 0
3 [DTD2010] MRC 0943-242 413 G 09 45 25.74 -24 30 28.8           ~ 1 0
4 [DTD2010] MRC 0943-242 410 G 09 45 26.07 -24 30 20.2     23.73   22.85 ~ 1 0
5 [DTD2010] MRC 0943-242 402 G 09 45 26.15 -24 29 38.2           ~ 1 0
6 [DTD2010] MRC 0943-242 873 G 09 45 26.16 -24 26 48.2     24.54   23.27 ~ 1 0
7 [DTD2010] MRC 0943-242 860 G 09 45 26.55 -24 28 14.8     27.2   24.99 ~ 1 0
8 [DTD2010] MRC 0943-242 387 G 09 45 26.90 -24 31 08.2           ~ 1 0
9 [DTD2010] MRC 0943-242 845 G 09 45 27.07 -24 28 44.5     25.3   24.01 ~ 1 0
10 [DTD2010] MRC 0943-242 373 G 09 45 27.27 -24 30 37.7     24.70   23.52 ~ 1 0
11 [DTD2010] MRC 0943-242 830 G 09 45 27.39 -24 26 45.9           ~ 1 0
12 [DTD2010] MRC 0943-242 368 G 09 45 27.46 -24 30 46.8     24.68   22.79 ~ 1 0
13 [DTD2010] MRC 0943-242 803 G 09 45 28.25 -24 26 03.8     24.31   23.82 ~ 1 0
14 [DTD2010] MRC 0943-242 792 G 09 45 28.52 -24 26 16.8     24.74   23.19 ~ 1 0
15 [DTD2010] MRC 0943-242 341 G 09 45 28.76 -24 29 10.9     25.20   23.12 ~ 1 0
16 [DTD2010] MRC 0943-242 775 G 09 45 29.12 -24 28 23.9     26.47   24.60 ~ 1 0
17 [DTD2010] MRC 0943-242 LAE1141 G 09 45 29.518 -24 29 15.72           ~ 1 0
18 [DTD2010] MRC 0943-242 760 G 09 45 29.58 -24 28 02.5           ~ 1 0
19 [DTD2010] MRC 0943-242 LAE1618 G 09 45 29.582 -24 28 02.45           ~ 1 0
20 [DTD2010] MRC 0943-242 749 G 09 45 29.91 -24 27 24.7           ~ 1 0
21 [DTD2010] MRC 0943-242 722 G 09 45 30.36 -24 25 26.8     23.96   22.40 ~ 1 0
22 [DTD2010] MRC 0943-242 700 G 09 45 31.14 -24 27 01.3     24.58   23.91 ~ 1 0
23 [DTD2010] MRC 0943-242 267 G 09 45 31.31 -24 29 34.8     24.96   24.60 ~ 1 0
24 [DTD2010] MRC 0943-242 694 G 09 45 31.38 -24 27 39.1     26.81   24.43 ~ 1 0
25 [DTD2010] MRC 0943-242 690 G 09 45 31.50 -24 27 17.8     24.31   23.78 ~ 1 0
26 [DTD2010] MRC 0943-242 686 G 09 45 31.58 -24 26 41.0           ~ 1 0
27 [DTD2010] MRC 0943-242 250 G 09 45 31.77 -24 29 24.4           ~ 1 0
28 [DTD2010] MRC 0943-242 675 G 09 45 31.99 -24 28 14.8     24.96   24.51 ~ 1 0
29 [DTD2010] MRC 0943-242 241 G 09 45 32.28 -24 28 50.6           ~ 1 0
30 [DTD2010] MRC 0943-242 660 G 09 45 32.53 -24 26 38.0     25.06   24.26 ~ 1 0
31 PMN J0945-2429 rG 09 45 32.7 -24 28 49           ~ 90 1
32 NAME MRC 0943-242 Protocluster ClG 09 45 32.8 -24 28 49           ~ 5 0
33 [DTD2010] MRC 0943-242 221 G 09 45 32.81 -24 29 28.2           ~ 1 0
34 [DTD2010] MRC 0943-242 646 G 09 45 32.97 -24 27 59.6     25.73   24.26 ~ 1 0
35 [DTD2010] MRC 0943-242 623 G 09 45 33.66 -24 27 13.0     26.45   25.04 ~ 1 0
36 [DTD2010] MRC 0943-242 175 G 09 45 35.06 -24 29 24.3     25.02   24.09 ~ 1 0
37 [DTD2010] MRC 0943-242 174 G 09 45 35.11 -24 31 34.6     25.46   25.37 ~ 1 0
38 [DTD2010] MRC 0943-242 167 G 09 45 35.32 -24 29 46.8           ~ 1 0
39 [DTD2010] MRC 0943-242 153 G 09 45 35.72 -24 31 38.1     26.51   23.66 ~ 1 0
40 [DTD2010] MRC 0943-242 143 G 09 45 36.10 -24 30 34.4     24.98   24.00 ~ 1 0
41 [DTD2010] MRC 0943-242 139 G 09 45 36.34 -24 29 56.9           ~ 1 0
42 [DTD2010] MRC 0943-242 138 G 09 45 36.42 -24 30 25.6     24.29   23.65 ~ 1 0
43 [DTD2010] MRC 0943-242 544 G 09 45 36.52 -24 26 11.8     24.59   23.75 ~ 1 0
44 [DTD2010] MRC 0943-242 130 G 09 45 36.82 -24 29 51.8         25.33 ~ 1 0
45 [DTD2010] MRC 0943-242 123 G 09 45 37.03 -24 31 18.1           ~ 1 0
46 [DTD2010] MRC 0943-242 116 G 09 45 37.23 -24 31 48.5     26.45   23.78 ~ 1 0
47 [DTD2010] MRC 0943-242 114 G 09 45 37.23 -24 29 59.2           ~ 1 0
48 [DTD2010] MRC 0943-242 110 G 09 45 37.26 -24 30 20.8           ~ 1 0
49 [DTD2010] MRC 0943-242 103 G 09 45 37.41 -24 30 12.1     24.81   24.23 ~ 1 0
50 [DTD2010] MRC 0943-242 522 G 09 45 37.44 -24 27 50.4     27.5   25.23 ~ 1 0
51 [DTD2010] MRC 0943-242 100 G 09 45 37.47 -24 29 09.5     24.61   23.73 ~ 1 0
52 [DTD2010] MRC 0943-242 LAE381 G 09 45 37.759 -24 31 10.82           ~ 1 0
53 [DTD2010] MRC 0943-242 511 G 09 45 37.84 -24 28 43.9     25.7   24.91 ~ 1 0
54 [DTD2010] MRC 0943-242 498 G 09 45 38.26 -24 28 08.6     26.4   24.59 ~ 1 0
55 [DTD2010] MRC 0943-242 72 G 09 45 38.30 -24 30 46.0           ~ 1 0
56 [DTD2010] MRC 0943-242 495 G 09 45 38.33 -24 27 03.3           ~ 1 0
57 [DTD2010] MRC 0943-242 64 G 09 45 38.82 -24 30 39.0     26.0   25.07 ~ 1 0
58 [DTD2010] MRC 0943-242 39 G 09 45 39.72 -24 32 02.6     25.4   24.13 ~ 1 0
59 [DTD2010] MRC 0943-242 34 G 09 45 39.92 -24 29 19.7     27.9   25.75 ~ 1 0
60 [DTD2010] MRC 0943-242 23 G 09 45 40.40 -24 29 00.6           ~ 1 0
61 [DTD2010] MRC 0943-242 16 G 09 45 40.57 -24 31 24.7     24.16   23.48 ~ 1 0
62 [DTD2010] MRC 1138-262 493 G 11 40 33.42 -26 29 14.6           ~ 1 0
63 [DTD2010] MRC 1138-262 867 G 11 40 34.09 -26 30 38.7         25.32 ~ 1 0
64 [DTD2010] MRC 1138-262 156 G 11 40 34.82 -26 27 46.4           ~ 1 0
65 [DTD2010] MRC 1138-262 174 G 11 40 35.45 -26 27 51.8   25.35     25.06 ~ 1 0
66 [DTD2010] MRC 1138-262 676 G 11 40 36.96 -26 29 55.6           ~ 1 0
67 [DTD2010] MRC 1138-262 808 G 11 40 38.19 -26 30 24.3         24.87 ~ 1 0
68 [DTD2010] MRC 1138-262 552 G 11 40 38.28 -26 29 25.1         25.37 ~ 1 0
69 [KPR2004] LyA 968 AGN 11 40 39.7 -26 28 45   24.2     22.87 ~ 9 0
70 [DTD2010] MRC 1138-262 877 G 11 40 40.24 -26 30 41.2   25.96     24.91 ~ 1 0
71 [DTD2010] MRC 1138-262 341 G 11 40 41.47 -26 28 37.2         24.81 ~ 1 0
72 [DTD2010] MRC 1138-262 369 G 11 40 43.46 -26 28 45.2           ~ 1 0
73 [DTD2010] MRC 1138-262 147 G 11 40 43.48 -26 27 44.1           ~ 1 0
74 [DTD2010] J114043.85-263126.4 G 11 40 43.85 -26 31 26.4           ~ 1 0
75 [DTD2010] MRC 1138-262 905 G 11 40 44.01 -26 30 47.0           ~ 1 0
76 [DTD2010] MRC 1138-262 456 G 11 40 44.20 -26 29 07.0         24.5 ~ 3 0
77 [DTD2010] MRC 1138-262 464 G 11 40 46.09 -26 29 11.5           ~ 2 0
78 [DTD2010] MRC 1138-262 558 G 11 40 46.40 -26 29 26.9         24.1 ~ 3 0
79 [DTD2010] MRC 1138-262 476 G 11 40 46.68 -26 29 10.4         24.90 ~ 1 0
80 [DTD2010] MRC 1138-262 605 G 11 40 47.58 -26 29 38.2           ~ 1 0
81 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 252 1
82 [DTD2010] MRC 1138-262 830 G 11 40 48.36 -26 30 30.6         20.48 ~ 1 0
83 NAME MRC 1138-262 Protocluster ClG 11 40 48.4 -26 29 11           ~ 24 0
84 [DTD2010] MRC 1138-262 492 G 11 40 49.59 -26 29 07.7         25.60 ~ 1 0
85 [DTD2010] MRC 1138-262 392 G 11 40 50.35 -26 28 49.6           ~ 1 0
86 [DTD2010] J114050.68-263100.0 G 11 40 50.68 -26 31 00.0           ~ 1 0
87 [DTD2010] MRC 1138-262 573 G 11 40 50.75 -26 29 32.5         24.68 ~ 1 0
88 [TTM2013] 635 EmO 11 40 51.20 -26 29 38.5         23.45 ~ 6 0
89 [DTD2010] MRC 1138-262 506 G 11 40 53.13 -26 29 18.1         23.55 ~ 1 0
90 [DTD2010] MRC 1138-262 165 G 11 40 54.01 -26 27 48.1           ~ 1 0
91 DKB 15 G 11 40 54.75 -26 28 03.4         25.44 ~ 2 0
92 [DTD2010] MRC 1138-262 223 G 11 40 55.99 -26 28 02.9   26.13     24.30 ~ 1 0
93 [DTD2010] MRC 1138-262 268 G 11 40 57.02 -26 28 17.5         23.02 ~ 1 0
94 [DTD2010] MRC 1138-262 206 G 11 40 57.87 -26 27 59.3         24.52 ~ 1 0
95 [DTD2010] MRC 1138-262 565 G 11 41 00.10 -26 29 28.1           ~ 1 0
96 [DTD2010] MRC 1138-262 451 G 11 41 00.84 -26 29 04.7           ~ 1 0
97 [DTD2010] MRC 1138-262 90 G 11 41 01.54 -26 27 31.2         23.55 ~ 1 0
98 [DTD2010] MRC 1138-262 728 G 11 41 02.69 -26 30 07.8           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2021.01.17-14:36:21

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