Lyα Galaxies in the Epoch of Reionization (LAGER): Spectroscopic Confirmation of Two Redshift ~7.0 Galaxies
We spectroscopically confirmed two narrowband-selected redshift 7.0 Lyα galaxies and studied their rest-frame UV spectra. The Lyα and other UV nebular lines are very useful to confirm the galactic redshifts and diagnose the different mechanisms driving the ionizing emission. We observed two narrowba...
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| Veröffentlicht in: | The Astrophysical journal 2019-05, Vol.876 (2), p.123 |
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| container_title | The Astrophysical journal |
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| creator | Yang, Huan Infante, Leopoldo Rhoads, James E. Hu, Weida Zheng, Zhenya Malhotra, Sangeeta Wang, Junxian Barrientos, L. Felipe Kang, Wenyong Jiang, Chunyan |
| description | We spectroscopically confirmed two narrowband-selected redshift 7.0 Lyα galaxies and studied their rest-frame UV spectra. The Lyα and other UV nebular lines are very useful to confirm the galactic redshifts and diagnose the different mechanisms driving the ionizing emission. We observed two narrowband-selected z = 7.0 Lyα candidates in the LAGER Chandra Deep Field South (CDFS) field with IMACS at the Magellan telescope and confirmed they are Lyα emitters at z = 6.924 and 6.931. In one galaxy, we also obtained deep near-infrared (NIR) spectroscopy, which yields non-detections of the high-ionization UV nebular lines. We measured the upper limits of the ratios of C iv λ1548/Lyα, He ii λ1640/Lyα, O iii]λ1660/Lyα, and C iii]λ1909/Lyα from the NIR spectra. These upper limits imply that the ionizing emission in this galaxy is dominated by normal star formation instead of an active galactic nucleus. |
| doi_str_mv | 10.3847/1538-4357/ab16ce |
| format | Article |
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We measured the upper limits of the ratios of C iv λ1548/Lyα, He ii λ1640/Lyα, O iii]λ1660/Lyα, and C iii]λ1909/Lyα from the NIR spectra. These upper limits imply that the ionizing emission in this galaxy is dominated by normal star formation instead of an active galactic nucleus.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/ab16ce</identifier><language>eng</language><publisher>Goddard Space Flight Center: American Astronomical Society</publisher><subject>Active galactic nuclei ; Astrophysics ; Emitters ; Galaxies ; Ionization ; Lager ; Narrowband ; Near infrared radiation ; Red shift ; Spectroscopy ; Spectrum analysis ; Star & galaxy formation ; Star formation ; Stars & galaxies</subject><ispartof>The Astrophysical journal, 2019-05, Vol.876 (2), p.123</ispartof><rights>Copyright IOP Publishing May 10, 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c249e-17d75ec65e5a575334cf4b808aa9044c1a1d05f0c0791b72b53b36a7d4c05bba3</citedby><cites>FETCH-LOGICAL-c249e-17d75ec65e5a575334cf4b808aa9044c1a1d05f0c0791b72b53b36a7d4c05bba3</cites><orcidid>0000-0003-2573-8100 ; 0000-0003-2260-7420 ; 0000-0001-8581-932X ; 0000-0002-1501-454X ; 0000-0002-9226-5350</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Yang, Huan</creatorcontrib><creatorcontrib>Infante, Leopoldo</creatorcontrib><creatorcontrib>Rhoads, James E.</creatorcontrib><creatorcontrib>Hu, Weida</creatorcontrib><creatorcontrib>Zheng, Zhenya</creatorcontrib><creatorcontrib>Malhotra, Sangeeta</creatorcontrib><creatorcontrib>Wang, Junxian</creatorcontrib><creatorcontrib>Barrientos, L. Felipe</creatorcontrib><creatorcontrib>Kang, Wenyong</creatorcontrib><creatorcontrib>Jiang, Chunyan</creatorcontrib><title>Lyα Galaxies in the Epoch of Reionization (LAGER): Spectroscopic Confirmation of Two Redshift ~7.0 Galaxies</title><title>The Astrophysical journal</title><description>We spectroscopically confirmed two narrowband-selected redshift 7.0 Lyα galaxies and studied their rest-frame UV spectra. The Lyα and other UV nebular lines are very useful to confirm the galactic redshifts and diagnose the different mechanisms driving the ionizing emission. We observed two narrowband-selected z = 7.0 Lyα candidates in the LAGER Chandra Deep Field South (CDFS) field with IMACS at the Magellan telescope and confirmed they are Lyα emitters at z = 6.924 and 6.931. In one galaxy, we also obtained deep near-infrared (NIR) spectroscopy, which yields non-detections of the high-ionization UV nebular lines. We measured the upper limits of the ratios of C iv λ1548/Lyα, He ii λ1640/Lyα, O iii]λ1660/Lyα, and C iii]λ1909/Lyα from the NIR spectra. These upper limits imply that the ionizing emission in this galaxy is dominated by normal star formation instead of an active galactic nucleus.</description><subject>Active galactic nuclei</subject><subject>Astrophysics</subject><subject>Emitters</subject><subject>Galaxies</subject><subject>Ionization</subject><subject>Lager</subject><subject>Narrowband</subject><subject>Near infrared radiation</subject><subject>Red shift</subject><subject>Spectroscopy</subject><subject>Spectrum analysis</subject><subject>Star & galaxy formation</subject><subject>Star formation</subject><subject>Stars & galaxies</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>CYI</sourceid><recordid>eNo9kMFLwzAUxoMoOKd3Dx4CXvTQ7aVJmtabjDmFgTAneAtpmrKOralJh86D_5P_iH-TKZWdPt7j-32P9yF0SWBEUybGhNM0YpSLscpJos0RGhxWx2gAACxKqHg7RWfer7sxzrIB2sz3vz94pjbqszIeVzVuVwZPG6tX2JZ4YSpbV1-qDYJv5vez6eL2Dr80RrfOem2bSuOJrcvKbXtPYJYfNnCFX1Vli7_FCA7x5-ikVBtvLv51iF4fpsvJYzR_nj1N7ueRjllmIiIKwY1OuOGKC04p0yXLU0iVyoAxTRQpgJegQWQkF3HOaU4TJQqmgee5okN03ec2zr7vjG_l2u5cHU7KmCY8Y4zTLLigd-nwinemlI2rtsrtJQHZdSq7AmVXoOw7DchVj9TKK1m3LgQCyQDiNAVK_wCGMnKE</recordid><startdate>20190510</startdate><enddate>20190510</enddate><creator>Yang, Huan</creator><creator>Infante, Leopoldo</creator><creator>Rhoads, James E.</creator><creator>Hu, Weida</creator><creator>Zheng, Zhenya</creator><creator>Malhotra, Sangeeta</creator><creator>Wang, Junxian</creator><creator>Barrientos, L. 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Felipe</au><au>Kang, Wenyong</au><au>Jiang, Chunyan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Lyα Galaxies in the Epoch of Reionization (LAGER): Spectroscopic Confirmation of Two Redshift ~7.0 Galaxies</atitle><jtitle>The Astrophysical journal</jtitle><date>2019-05-10</date><risdate>2019</risdate><volume>876</volume><issue>2</issue><spage>123</spage><pages>123-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>We spectroscopically confirmed two narrowband-selected redshift 7.0 Lyα galaxies and studied their rest-frame UV spectra. The Lyα and other UV nebular lines are very useful to confirm the galactic redshifts and diagnose the different mechanisms driving the ionizing emission. We observed two narrowband-selected z = 7.0 Lyα candidates in the LAGER Chandra Deep Field South (CDFS) field with IMACS at the Magellan telescope and confirmed they are Lyα emitters at z = 6.924 and 6.931. In one galaxy, we also obtained deep near-infrared (NIR) spectroscopy, which yields non-detections of the high-ionization UV nebular lines. We measured the upper limits of the ratios of C iv λ1548/Lyα, He ii λ1640/Lyα, O iii]λ1660/Lyα, and C iii]λ1909/Lyα from the NIR spectra. These upper limits imply that the ionizing emission in this galaxy is dominated by normal star formation instead of an active galactic nucleus.</abstract><cop>Goddard Space Flight Center</cop><pub>American Astronomical Society</pub><doi>10.3847/1538-4357/ab16ce</doi><orcidid>https://orcid.org/0000-0003-2573-8100</orcidid><orcidid>https://orcid.org/0000-0003-2260-7420</orcidid><orcidid>https://orcid.org/0000-0001-8581-932X</orcidid><orcidid>https://orcid.org/0000-0002-1501-454X</orcidid><orcidid>https://orcid.org/0000-0002-9226-5350</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Active galactic nuclei Astrophysics Emitters Galaxies Ionization Lager Narrowband Near infrared radiation Red shift Spectroscopy Spectrum analysis Star & galaxy formation Star formation Stars & galaxies |
| title | Lyα Galaxies in the Epoch of Reionization (LAGER): Spectroscopic Confirmation of Two Redshift ~7.0 Galaxies |
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