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Date and Time of the Query: 2018-11-17 T10:05:06 PST
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For refcode 1996ApJ...457..490F:
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Copyright by American Astronomical Society. Reproduced by permission
1996ApJ...457..490F A GROUP OF GALAXIES AT REDSHIFT 2.38 PAUL J. FRANCIS, BRUCE E. WOODGATE, STEPHEN J. WARREN, PALLE MOLLER, MARGARET MAZZOLINI, ANDREW J. BUNKER, JAMES D. LOWENTHAL, TED B. WILLIAMS, TAKEO MINEZAKI, YUKIYASU KOBAYASHI, AND YUZURU YOSHII Received 1995 June 2; accepted 1995 August 8 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 Ly{alpha}-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 Ly{alpha} galaxies lies 22" from a background QSO and may be associated with a multicomponent Ly{alpha} absorption complex seen in the QSO spectrum. This galaxy has an extended (~50 kpc), lumpy Ly{alpha} morphology surrounding a compact, IR-bright nucleus. The nucleus shows a pronounced break in its optical-UV colors at ~400O A (rest frame), consistent with a stellar population of mass ~7 x 10^11^ M_sun_, 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 Ly{alpha} emission is redshifted by ~490 km s^-1^ with respect to the C IV emission, probably because of absorption. Extended H{alpha} emission is also detected; the ratio of Ly{alpha} flux to H{alpha} 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. Subject headings: galaxies: clusters: individual (2139-4434) - galaxies: distances and redshifts
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