1999ApJ...525..609S

Query : 1999ApJ...525..609S

1999ApJ...525..609S - Astrophys. J., 525, 609-620 (1999/November-2)

Hubble Space Telescope near-infrared and optical imaging of faint radio sources in the distant cluster Cl 0939+4713.

SMAIL I., MORRISON G., GRAY M.E., OWEN F.N., IVISON R.J., KNEIB J.-P. and ELLIS R.S.

Abstract (from CDS):

We present deep Hubble Space Telescope Near-Infrared Camera and Multiobject Spectrograph (NICMOS) and Wide Field and Planetary Camera 2 (WFPC2) optical imaging of a small region in the core of the distant rich cluster Cl 0939+4713 (z=0.41). We compare the optical and near-infrared morphologies of cluster members and find apparent small-scale optical structures within the galaxies that are absent in the near-infrared. We conclude that strong dust obscuration is a common feature in the late-type galaxies in distant clusters. We then concentrate on a sample of 10 faint radio galaxies lying within our NICMOS field and selected from a very deep 1.4 GHz VLA map of the cluster with a 1 σ flux limit of 9 µJy. Using published data we focus on the spectral properties of the eight radio-selected cluster members and show that these comprise a large fraction of the poststarburst population in the cluster. The simplest interpretation of the radio emission from these galaxies is that they are currently forming massive stars, contradicting their classification as poststarburst systems based on the optical spectra. We suggest that this star formation is hidden from view in the optical by the same obscuring dust that is apparent in our comparison on the optical and near-infrared morphologies of these galaxies. We caution that even in the rest-frame optical the effects of dust cannot be ignored when comparing samples of distant galaxies to low-redshift systems, particularly if dust is as prevalent in distant galaxies as appears to be the case in our study.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: Individual: Alphanumeric: Cl 0939+4713 - Galaxies: Evolution - Galaxies: Starburst - Infrared: Galaxies - Radio Continuum: Galaxies

CDS comments: Objects in fig. 1 and T. 1 are [SDC97] d NNNN

Simbad objects: 28

goto Full paper

goto View the references in ADS

Number of rows : 28
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 SED ACO 851 11 GiC 09 42 55.1744 +46 58 41.829           ~ 9 0
2 SED ACO 851 92 GiC 09 42 55.1861 +46 59 22.674           ~ 9 0
3 [DG92] 4-435 GiC 09 42 55.20 +46 59 36.8           ~ 7 0
4 SED ACO 851 47 GiC 09 42 55.7120 +46 59 32.197           ~ 11 0
5 SED ACO 851 8 BiC 09 42 55.869 +46 59 39.31           ~ 13 0
6 SED ACO 851 9 GiC 09 42 56.2491 +46 59 12.071           ~ 12 0
7 [MLF2000] 3215 EmG 09 42 56.54 +46 58 58.4           ~ 10 0
8 [DG92] 4-312 GiC 09 42 56.73 +46 58 48.7           ~ 6 0
9 SED ACO 851 113 GiC 09 42 56.8729 +46 59 28.007           ~ 9 0
10 SDSS J094257.44+465849.7 BiC 09 42 57.442 +46 58 49.76           ~ 19 0
11 SED ACO 851 87 GiC 09 42 57.68 +46 59 43.9           ~ 12 0
12 SED ACO 851 10 GiC 09 42 58.017 +46 59 12.28           ~ 13 0
13 SED ACO 851 102 GiC 09 42 58.22 +46 59 51.5           ~ 11 0
14 SED ACO 851 65 GiC 09 43 00.10 +46 58 52.0           ~ 8 0
15 [MLF2000] 2978 GiC 09 43 00.26 +46 58 34.2           ~ 9 0
16 SED ACO 851 147 GiC 09 43 00.4743 +46 59 27.687           ~ 10 0
17 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
18 [BR96] Cl 0939+472 398 GiC 09 43 01.21 +46 58 41.1           ~ 7 0
19 [DG92] 4-431 GiC 09 43 01.42 +46 59 35.7           ~ 8 0
20 SED ACO 851 38 GiC 09 43 01.4244 +46 59 38.676           ~ 10 0
21 SED ACO 851 133 GiC 09 43 01.44 +46 59 30.4           ~ 11 0
22 [BBC2000] 60 GiC 09 43 02.40 +46 59 27.4           ~ 7 0
23 [DG92] 4-392 GiC 09 43 02.47 +46 59 22.2           ~ 6 0
24 [BBC2000] 52 GiC 09 43 02.64 +46 58 56.7           ~ 8 0
25 SED ACO 851 30 GiC 09 43 02.8332 +46 59 23.465           ~ 12 0
26 [BBC2000] 30 GiC 09 43 03.44 +46 59 14.7           ~ 10 0
27 [BBC2000] 44 GiC 09 43 04.32 +46 59 43.6           ~ 10 0
28 SED ACO 851 137 GiC 09 43 04.7020 +46 59 40.831           ~ 9 0

To bookmark this query, right click on this link: simbad:objects in 1999ApJ...525..609S and select 'bookmark this link' or equivalent in the popup menu