A group of galaxies at redshift 2.38
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 and Hewett'...
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
Institute of Physics Publishing
1996
|
| _version_ | 1826299818145742848 |
|---|---|
| author | Francis, P Woodgate, B Warren, S Moller, P Mazzolini, M Bunker, A Lowenthal, J Williams, T Minezaki, T Kobayashi, Y Yoshii, Y |
| author_facet | Francis, P Woodgate, B Warren, S Moller, P Mazzolini, M Bunker, A Lowenthal, J Williams, T Minezaki, T Kobayashi, Y Yoshii, Y |
| author_sort | Francis, P |
| collection | OXFORD |
| description | 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 and Hewett's interpretation of the absorption-line supercluster as a high-redshift Great Wall. One of the Lyα galaxies lies 22″ from a background QSO and may be associated with a multicomponent Lyα absorption complex seen in the QSO spectrum. This galaxy has an extended (∼50 kpc), lumpy Lyα 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 M⊙, 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 Lyα 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 Lyα 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. © 1996. The American Astronomical Society. All rights reserved. |
| first_indexed | 2024-03-07T05:07:44Z |
| format | Journal article |
| id | oxford-uuid:da8166c9-27e7-4eac-90c2-3eb531ef19d9 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:07:44Z |
| publishDate | 1996 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:da8166c9-27e7-4eac-90c2-3eb531ef19d92022-03-27T09:03:41ZA group of galaxies at redshift 2.38Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:da8166c9-27e7-4eac-90c2-3eb531ef19d9EnglishSymplectic Elements at OxfordInstitute of Physics Publishing1996Francis, PWoodgate, BWarren, SMoller, PMazzolini, MBunker, ALowenthal, JWilliams, TMinezaki, TKobayashi, YYoshii, YWe 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 and Hewett's interpretation of the absorption-line supercluster as a high-redshift Great Wall. One of the Lyα galaxies lies 22″ from a background QSO and may be associated with a multicomponent Lyα absorption complex seen in the QSO spectrum. This galaxy has an extended (∼50 kpc), lumpy Lyα 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 M⊙, 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 Lyα 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 Lyα 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. © 1996. The American Astronomical Society. All rights reserved. |
| spellingShingle | Francis, P Woodgate, B Warren, S Moller, P Mazzolini, M Bunker, A Lowenthal, J Williams, T Minezaki, T Kobayashi, Y Yoshii, Y A group of galaxies at redshift 2.38 |
| title | A group of galaxies at redshift 2.38 |
| title_full | A group of galaxies at redshift 2.38 |
| title_fullStr | A group of galaxies at redshift 2.38 |
| title_full_unstemmed | A group of galaxies at redshift 2.38 |
| title_short | A group of galaxies at redshift 2.38 |
| title_sort | group of galaxies at redshift 2 38 |
| work_keys_str_mv | AT francisp agroupofgalaxiesatredshift238 AT woodgateb agroupofgalaxiesatredshift238 AT warrens agroupofgalaxiesatredshift238 AT mollerp agroupofgalaxiesatredshift238 AT mazzolinim agroupofgalaxiesatredshift238 AT bunkera agroupofgalaxiesatredshift238 AT lowenthalj agroupofgalaxiesatredshift238 AT williamst agroupofgalaxiesatredshift238 AT minezakit agroupofgalaxiesatredshift238 AT kobayashiy agroupofgalaxiesatredshift238 AT yoshiiy agroupofgalaxiesatredshift238 AT francisp groupofgalaxiesatredshift238 AT woodgateb groupofgalaxiesatredshift238 AT warrens groupofgalaxiesatredshift238 AT mollerp groupofgalaxiesatredshift238 AT mazzolinim groupofgalaxiesatredshift238 AT bunkera groupofgalaxiesatredshift238 AT lowenthalj groupofgalaxiesatredshift238 AT williamst groupofgalaxiesatredshift238 AT minezakit groupofgalaxiesatredshift238 AT kobayashiy groupofgalaxiesatredshift238 AT yoshiiy groupofgalaxiesatredshift238 |