2005A&A...431..793V


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.19CEST00:51:50

2005A&A...431..793V - Astronomy and Astrophysics, volume 431, 793-812 (2005/3-1)

Properties of Lyα emitters around the radio galaxy MRC 0316-257.

VENEMANS B.P., ROETTGERING H.J.A., MILEY G.K., KURK J.D., DE BREUCK C., OVERZIER R.A., VAN BREUGEL W.J.M., CARILLI C.L., FORD H., HECKMAN T., PENTERICCI L. and McCARTHY P.

Abstract (from CDS):

Observations of the radio galaxy MRC 0316-257 at z=3.13 and the surrounding field are presented. Using narrow- and broad-band imaging obtained with the VLT, 77 candidate Lyα emitters with a rest-frame equivalent width of >15Å were selected in a ∼7'x7' field around the radio galaxy. Spectroscopy of 40 candidate emitters resulted in the discovery of 33 emission line galaxies of which 31 are Lyα emitters with redshifts similar to that of the radio galaxy, while the remaining two galaxies turned out to be [OII] emitters. The Lyα profiles have widths (FWHM) in the range of 120-800km/s, with a median of 260km/s. Where the signal-to-noise was large enough, the Lyα profiles were found to be asymmetric, with apparent absorption troughs blueward of the profile peaks, indicative of absorption along the line of sight of an HI mass of at least 2x102-5x104M. Besides that of the radio galaxy and one of the emitters that is a QSO, the continuum of the emitters is faint, with luminosities ranging from 1.3L* to <0.03L*. The colors of the confirmed emitters are, on average, very blue. The median UV continuum slope is β=-1.76, bluer than the average slope of LBGs with Lyα emission (β~-1.09). A large fraction of the confirmed emitters (∼2/3) have colors consistent with that of dust-free starburst galaxies. Observations with the Advanced Camera for Surveys on the Hubble Space Telescope show that the emitters that were detected in the ACS image have a range of different morphologies. Four Lyα emitters (∼25%) were unresolved with upper limits on their half light radii of rh<0.6-1.3kpc, three objects (∼19%) show multiple clumps of emission, as does the radio galaxy, and the rest (∼56%) are single, resolved objects with rh<1.5kpc. A comparison with the sizes of Lyman break galaxies at z∼3 suggests that the Lyα emitters are on average smaller than LBGs. The average star formation rate of the Lyα emitters is 2.6M/yr as measured by the Lyα emission line or <3.9M/yr as measured by the UV continuum. The properties of the Lyα galaxies (faint, blue and small) are consistent with young star forming galaxies which are still nearly dust free. The volume density of Lyα emitting galaxies in the field around MRC 0316-257 is a factor of 3.3+0.5–0.4 larger compared with the density of field Lyα emitters at that redshift. The velocity distribution of the spectroscopically confirmed emitters has a dispersion of 640km/s, corresponding to a FWHM of 1510km/s, which is substantially smaller than the width of the narrow-band filter (FWHM∼3500km/s). The peak of the velocity distribution is located within 200 km/s of the redshift of the radio galaxy. We conclude that the confirmed Lyα emitters are members of a protocluster of galaxies at z∼3.13. The size of the protocluster is unconstrained and is larger than 3.3x3.3Mpc2. The mass of this structure is estimated to be >3-6x1014M and could be the progenitor of a cluster of galaxies similar to e.g. the Virgo cluster.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift - galaxies: evolution - galaxies: clusters: general - cosmology: observations - cosmology: early Universe

VizieR on-line data: <Available at CDS (J/A+A/431/793): table2.dat table4.dat>

Nomenclature: NAME MRC 0316-257 Protocluster N=1. Table 2: [VRM2005] NNNN N=31 among (Nos 344-3388).

Simbad objects: 36

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Number of rows : 36

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 MRC 0316-257B EmG 03 17 59.63 -25 34 01.3     23.21     ~ 3 0
2 [VRM2005] 1029 EmG 03 18 00.07 -25 36 43.6     26.19     ~ 1 0
3 [VRM2005] 1753 EmG 03 18 01.22 -25 35 22.3     25.67     ~ 1 0
4 [VRM2005] 1361 EmG 03 18 01.57 -25 36 07.8     26.47     ~ 1 0
5 [VRM2005] 1099 EmG 03 18 02.79 -25 36 35.8     26.39     ~ 1 0
6 [VRM2005] 1612 EmG 03 18 03.49 -25 35 39.2     27.65     ~ 1 0
7 [VRM2005] 1147 EmG 03 18 03.99 -25 36 31.9     27.83     ~ 1 0
8 [VRM2005] 1891 EmG 03 18 04.29 -25 35 04.9     26.76     ~ 1 0
9 [VRM2005] 1446 EmG 03 18 04.89 -25 35 57.7     26.32     ~ 1 0
10 [VRM2005] 1968 EmG 03 18 05.14 -25 34 51.2     26.48     ~ 1 0
11 [VRM2005] 344 EmG 03 18 05.83 -25 37 55.7     26.62     ~ 1 0
12 [MHV2008] 17 EmG 03 18 06.92 -25 35 26.2     27.91     ~ 2 0
13 [VRM2005] 1955 EmG 03 18 07.58 -25 34 55.5     27.56     ~ 1 0
14 [LDC96] A EmG 03 18 09.00 -25 34 59.6     23.84 23.77   ~ 4 0
15 [MHV2008] 14 EmG 03 18 09.67 -25 36 47.5     26.14     ~ 2 0
16 NVSS J031812-253509 rG 03 18 12.00 -25 35 09.0   23.6 23.8     ~ 74 2
17 NAME MRC 0316-257 Protocluster ClG 03 18 12.00 -25 35 09.0           ~ 7 0
18 [MHV2008] 11 EmG 03 18 12.03 -25 34 52.8     26.44     ~ 2 0
19 [MHV2008] 6 EmG 03 18 12.55 -25 36 23.0     26.00     ~ 2 0
20 [VRM2005] 695 EmG 03 18 13.26 -25 37 18.9     26.42     ~ 1 0
21 [MHV2008] 15 EmG 03 18 14.14 -25 35 54.3     27.55     ~ 2 0
22 [MHV2008] 18 EmG 03 18 15.12 -25 35 13.1     25.73     ~ 2 0
23 [MHV2008] 16 EmG 03 18 15.17 -25 35 28.9     27.09     ~ 2 0
24 [MHV2008] 7 EmG 03 18 16.78 -25 35 46.2     24.47     ~ 3 0
25 [VRM2005] 1946 EmG 03 18 20.29 -25 34 59.4     26.40     ~ 1 0
26 [VRM2005] 2413 EmG 03 18 20.40 -25 33 00.3     25.97     ~ 1 0
27 [VRM2005] 748 EmG 03 18 21.51 -25 37 13.9     27.03     ~ 1 0
28 [VRM2005] 2637 EmG 03 18 22.52 -25 34 10.1     25.97     ~ 1 0
29 [VRM2005] 3101 EmG 03 18 24.09 -25 32 12.2     25.70     ~ 1 0
30 [VRM2005] 1395 EmG 03 18 24.78 -25 36 05.7     27.50     ~ 1 0
31 [VRM2005] 1759 EmG 03 18 25.50 -25 35 20.4     25.87     ~ 1 0
32 [VRM2005] 2871 EmG 03 18 25.71 -25 33 40.5     27.64     ~ 1 0
33 [VRM2005] 3388 EmG 03 18 26.09 -25 32 53.1     25.25     ~ 1 0
34 LP 995-86 PM* 03 48 22.6125635562 -39 08 37.013516494   13.61 13.15     F 92 0
35 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 255 1
36 [DBC2004] M03 rG 13 38 26.05 -19 42 30.5       22.4   ~ 91 0

    Equat.    Gal    SGal    Ecl

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2021.06.19-00:51:50

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