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Title:
A Group of Galaxies at Redshift 2.38
Authors:
Francis, Paul J.; Woodgate, Bruce E.; Warren, Stephen J.; Moller, Palle; Mazzolini, Margaret; Bunker, Andrew J.; Lowenthal, James D.; Williams, Ted B.; Minezaki, Takeo; Kobayashi, Yukiyasu; Yoshii, Yuzuru
Publication:
Astrophysical Journal v.457, p.490 (ApJ Homepage)
Publication Date:
02/1996
Origin:
APJ
ApJ Keywords:
GALAXIES: DISTANCES AND REDSHIFTS, GALAXIES: CLUSTERS: INDIVIDUAL ALPHANUMERIC: 2139-4434
DOI:
10.1086/176747
Bibliographic Code:
1996ApJ...457..490F

Abstract

We report the discovery of a group of galaxies at redshift 2.38. We imaged ˜10% of a claimed supercluster of QSO absorption lines at z = 2.38. In this small field (2' radius), we detect two Lyα-emitting galaxies. The discovery of two such galaxies in our tiny field supports Francis & Hewett's interpretation of the absorption- line supercluster as a high-redshift Great Wall.

One of the Lyman alpha galaxies lies 22" from a background QSO and may be associated with a multicomponent Lyman alpha absorption complex seen in the QSO spectrum. This galaxy has an extended (˜50 kpc), lumpy Lyman alpha morphology surrounding a compact, IR-bright nucleus. The nucleus shows a pronounced break in its optical-UV colors at ˜4000 Å (rest frame), consistent with a stellar population of mass ˜7 × 1011 Msun, an age of greater than 500 Myr, and little ongoing star formation. C IV emission is detected, which suggests that a concealed active galactic nucleus is present. The Lyman alpha emission is redshifted by ˜490 km s-1 with respect to the C IV emission, probably because of absorption. Extended Hα emission is also detected; the ratio of Lyman alpha flux to Hα is abnormally low (˜0.7), probable evidence for extended dust.

This galaxy is surrounded by a number of very red (B - K > 5 mag) objects, some of which have colors that suggest that they too are at z = 2.38. We hypothesize that this galaxy, its neighbors, and a surrounding lumpy gas cloud may be a giant elliptical galaxy in the process of bottom-up formation.

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