CDFS-6664: A Candidate of Lyman-continuum Emission at z ∼ 3.8 Detected by the Hubble Deep UV Legacy Survey
We report the detection of Lyman continuum (LyC) emission from the galaxy, CDFS-6664, at z = 3.797 in a sample of Lyman break galaxies with detected [O iii ] emission lines. The LyC emission is detected with a significance ∼5 σ in the F336W band of the Hubble Deep UV Legacy Survey, corresponding to...
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| Veröffentlicht in: | Astrophysical journal. Letters 2021-12, Vol.923 (2), p.L28 |
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| creator | Yuan, Fang-Ting Zheng, Zhen-Ya Lin, Ruqiu Zhu, Shuairu Rahna, P. T. |
| description | We report the detection of Lyman continuum (LyC) emission from the galaxy, CDFS-6664, at
z
= 3.797 in a sample of Lyman break galaxies with detected [O
iii
] emission lines. The LyC emission is detected with a significance ∼5
σ
in the F336W band of the Hubble Deep UV Legacy Survey, corresponding to the 650–770 Å rest frame. The light centroid of the LyC emission is offset from the galaxy center by about 0.″2 (1.4 pkpc). The Hubble deep images at longer wavelengths show that the emission is unlikely provided by low-redshift interlopers. The photometric and spectroscopic data show that the possible contribution of an active galactic nucleus is quite low. Fitting the spectral energy distribution of this source to stellar population synthesis models, we find that the galaxy is young (∼50 Myr) and actively forming stars with a rate of 52.1 ± 4.9
M
⊙
yr
−1
. The significant star formation and the spatially offset LyC emission support a scenario where the ionizing photons escape from the low-density cavities in the ISM excavated by massive young stars. From the nebular model, we estimate the escape fraction of LyC photons to be 38% ± 7% and the corresponding intergalactic medium (IGM) transmission to be 60%, which deviates more than 3
σ
from the average transmission. The unusually high IGM transmission of LyC photons in CDFS-6664 may be related to a foreground type-2 quasar, CDF-202, at
z
= 3.7, with a projected separation of 1.′2 only. The quasar may have photoevaporated optically thick absorbers and enhance the transmission on the sightline of CDFS-6664. |
| doi_str_mv | 10.3847/2041-8213/ac4170 |
| format | Article |
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z
= 3.797 in a sample of Lyman break galaxies with detected [O
iii
] emission lines. The LyC emission is detected with a significance ∼5
σ
in the F336W band of the Hubble Deep UV Legacy Survey, corresponding to the 650–770 Å rest frame. The light centroid of the LyC emission is offset from the galaxy center by about 0.″2 (1.4 pkpc). The Hubble deep images at longer wavelengths show that the emission is unlikely provided by low-redshift interlopers. The photometric and spectroscopic data show that the possible contribution of an active galactic nucleus is quite low. Fitting the spectral energy distribution of this source to stellar population synthesis models, we find that the galaxy is young (∼50 Myr) and actively forming stars with a rate of 52.1 ± 4.9
M
⊙
yr
−1
. The significant star formation and the spatially offset LyC emission support a scenario where the ionizing photons escape from the low-density cavities in the ISM excavated by massive young stars. From the nebular model, we estimate the escape fraction of LyC photons to be 38% ± 7% and the corresponding intergalactic medium (IGM) transmission to be 60%, which deviates more than 3
σ
from the average transmission. The unusually high IGM transmission of LyC photons in CDFS-6664 may be related to a foreground type-2 quasar, CDF-202, at
z
= 3.7, with a projected separation of 1.′2 only. The quasar may have photoevaporated optically thick absorbers and enhance the transmission on the sightline of CDFS-6664.</description><identifier>ISSN: 2041-8205</identifier><identifier>EISSN: 2041-8213</identifier><identifier>DOI: 10.3847/2041-8213/ac4170</identifier><language>eng</language><publisher>Austin: The American Astronomical Society</publisher><subject>Active galactic nuclei ; Astronomical models ; Centroids ; Continuum radiation ; Emission lines ; Galaxies ; High-redshift galaxies ; Intergalactic media ; Photons ; Polls & surveys ; Quasars ; Red shift ; Reionization ; Space telescopes ; Spectral energy distribution ; Star & galaxy formation ; Star formation ; Stellar models ; Wavelengths</subject><ispartof>Astrophysical journal. Letters, 2021-12, Vol.923 (2), p.L28</ispartof><rights>2021. The Author(s). Published by the American Astronomical Society.</rights><rights>Copyright IOP Publishing Dec 01, 2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c2650-6f9ff9d4fa75f1975580202fa64fc12e2d9323d647fb2c224a68b4c1015507033</citedby><cites>FETCH-LOGICAL-c2650-6f9ff9d4fa75f1975580202fa64fc12e2d9323d647fb2c224a68b4c1015507033</cites><orcidid>0000-0002-5864-7195 ; 0000-0002-9634-2923 ; 0000-0001-6763-5869</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8213/ac4170/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>314,780,784,27924,27925,38868,38890,53840,53867</link.rule.ids></links><search><creatorcontrib>Yuan, Fang-Ting</creatorcontrib><creatorcontrib>Zheng, Zhen-Ya</creatorcontrib><creatorcontrib>Lin, Ruqiu</creatorcontrib><creatorcontrib>Zhu, Shuairu</creatorcontrib><creatorcontrib>Rahna, P. T.</creatorcontrib><title>CDFS-6664: A Candidate of Lyman-continuum Emission at z ∼ 3.8 Detected by the Hubble Deep UV Legacy Survey</title><title>Astrophysical journal. Letters</title><addtitle>APJL</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>We report the detection of Lyman continuum (LyC) emission from the galaxy, CDFS-6664, at
z
= 3.797 in a sample of Lyman break galaxies with detected [O
iii
] emission lines. The LyC emission is detected with a significance ∼5
σ
in the F336W band of the Hubble Deep UV Legacy Survey, corresponding to the 650–770 Å rest frame. The light centroid of the LyC emission is offset from the galaxy center by about 0.″2 (1.4 pkpc). The Hubble deep images at longer wavelengths show that the emission is unlikely provided by low-redshift interlopers. The photometric and spectroscopic data show that the possible contribution of an active galactic nucleus is quite low. Fitting the spectral energy distribution of this source to stellar population synthesis models, we find that the galaxy is young (∼50 Myr) and actively forming stars with a rate of 52.1 ± 4.9
M
⊙
yr
−1
. The significant star formation and the spatially offset LyC emission support a scenario where the ionizing photons escape from the low-density cavities in the ISM excavated by massive young stars. From the nebular model, we estimate the escape fraction of LyC photons to be 38% ± 7% and the corresponding intergalactic medium (IGM) transmission to be 60%, which deviates more than 3
σ
from the average transmission. The unusually high IGM transmission of LyC photons in CDFS-6664 may be related to a foreground type-2 quasar, CDF-202, at
z
= 3.7, with a projected separation of 1.′2 only. The quasar may have photoevaporated optically thick absorbers and enhance the transmission on the sightline of CDFS-6664.</description><subject>Active galactic nuclei</subject><subject>Astronomical models</subject><subject>Centroids</subject><subject>Continuum radiation</subject><subject>Emission lines</subject><subject>Galaxies</subject><subject>High-redshift galaxies</subject><subject>Intergalactic media</subject><subject>Photons</subject><subject>Polls & surveys</subject><subject>Quasars</subject><subject>Red shift</subject><subject>Reionization</subject><subject>Space telescopes</subject><subject>Spectral energy distribution</subject><subject>Star & galaxy formation</subject><subject>Star formation</subject><subject>Stellar models</subject><subject>Wavelengths</subject><issn>2041-8205</issn><issn>2041-8213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>O3W</sourceid><recordid>eNp1kM1Kw0AUhQdRsFb3Li-4Ne38ZTJxV_pjhYCLWrdhMpnRlObHTCLEJ_ChfBqfxJRIXbm6l8M5514-hK4JnjDJgynFnHiSEjZVmpMAn6DRUTo97tg_RxfO7TCmWBA5Qvv5YrXxhBD8DmYwV0WapaoxUFqIulwVni6LJivaNodlnjmXlQWoBj7g-_ML2ETCwjRGNyaFpIPm1cC6TZK96WVTwfYZIvOidAebtn433SU6s2rvzNXvHKPtavk0X3vR4_3DfBZ5mgofe8KG1oYptyrwLQkD35f9u9Qqwa0m1NA0ZJSlggc2oZpSroRMuCaY-D4OMGNjdDP0VnX51hrXxLuyrYv-ZEwFESyUkoW9Cw8uXZfO1cbGVZ3lqu5iguMD0_gALT4AjAemfeR2iGRl9df5r_0H-Edz0A</recordid><startdate>20211201</startdate><enddate>20211201</enddate><creator>Yuan, Fang-Ting</creator><creator>Zheng, Zhen-Ya</creator><creator>Lin, Ruqiu</creator><creator>Zhu, Shuairu</creator><creator>Rahna, P. T.</creator><general>The American Astronomical Society</general><general>IOP Publishing</general><scope>O3W</scope><scope>TSCCA</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-5864-7195</orcidid><orcidid>https://orcid.org/0000-0002-9634-2923</orcidid><orcidid>https://orcid.org/0000-0001-6763-5869</orcidid></search><sort><creationdate>20211201</creationdate><title>CDFS-6664: A Candidate of Lyman-continuum Emission at z ∼ 3.8 Detected by the Hubble Deep UV Legacy Survey</title><author>Yuan, Fang-Ting ; Zheng, Zhen-Ya ; Lin, Ruqiu ; Zhu, Shuairu ; Rahna, P. T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2650-6f9ff9d4fa75f1975580202fa64fc12e2d9323d647fb2c224a68b4c1015507033</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Active galactic nuclei</topic><topic>Astronomical models</topic><topic>Centroids</topic><topic>Continuum radiation</topic><topic>Emission lines</topic><topic>Galaxies</topic><topic>High-redshift galaxies</topic><topic>Intergalactic media</topic><topic>Photons</topic><topic>Polls & surveys</topic><topic>Quasars</topic><topic>Red shift</topic><topic>Reionization</topic><topic>Space telescopes</topic><topic>Spectral energy distribution</topic><topic>Star & galaxy formation</topic><topic>Star formation</topic><topic>Stellar models</topic><topic>Wavelengths</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yuan, Fang-Ting</creatorcontrib><creatorcontrib>Zheng, Zhen-Ya</creatorcontrib><creatorcontrib>Lin, Ruqiu</creatorcontrib><creatorcontrib>Zhu, Shuairu</creatorcontrib><creatorcontrib>Rahna, P. T.</creatorcontrib><collection>Institute of Physics Open Access Journal Titles</collection><collection>IOPscience (Open Access)</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Astrophysical journal. Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yuan, Fang-Ting</au><au>Zheng, Zhen-Ya</au><au>Lin, Ruqiu</au><au>Zhu, Shuairu</au><au>Rahna, P. T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>CDFS-6664: A Candidate of Lyman-continuum Emission at z ∼ 3.8 Detected by the Hubble Deep UV Legacy Survey</atitle><jtitle>Astrophysical journal. Letters</jtitle><stitle>APJL</stitle><addtitle>Astrophys. J. Lett</addtitle><date>2021-12-01</date><risdate>2021</risdate><volume>923</volume><issue>2</issue><spage>L28</spage><pages>L28-</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>We report the detection of Lyman continuum (LyC) emission from the galaxy, CDFS-6664, at
z
= 3.797 in a sample of Lyman break galaxies with detected [O
iii
] emission lines. The LyC emission is detected with a significance ∼5
σ
in the F336W band of the Hubble Deep UV Legacy Survey, corresponding to the 650–770 Å rest frame. The light centroid of the LyC emission is offset from the galaxy center by about 0.″2 (1.4 pkpc). The Hubble deep images at longer wavelengths show that the emission is unlikely provided by low-redshift interlopers. The photometric and spectroscopic data show that the possible contribution of an active galactic nucleus is quite low. Fitting the spectral energy distribution of this source to stellar population synthesis models, we find that the galaxy is young (∼50 Myr) and actively forming stars with a rate of 52.1 ± 4.9
M
⊙
yr
−1
. The significant star formation and the spatially offset LyC emission support a scenario where the ionizing photons escape from the low-density cavities in the ISM excavated by massive young stars. From the nebular model, we estimate the escape fraction of LyC photons to be 38% ± 7% and the corresponding intergalactic medium (IGM) transmission to be 60%, which deviates more than 3
σ
from the average transmission. The unusually high IGM transmission of LyC photons in CDFS-6664 may be related to a foreground type-2 quasar, CDF-202, at
z
= 3.7, with a projected separation of 1.′2 only. The quasar may have photoevaporated optically thick absorbers and enhance the transmission on the sightline of CDFS-6664.</abstract><cop>Austin</cop><pub>The American Astronomical Society</pub><doi>10.3847/2041-8213/ac4170</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-5864-7195</orcidid><orcidid>https://orcid.org/0000-0002-9634-2923</orcidid><orcidid>https://orcid.org/0000-0001-6763-5869</orcidid><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Institute of Physics IOPscience extra; Institute of Physics Open Access Journal Titles; Alma/SFX Local Collection; EZB Electronic Journals Library |
| subjects | Active galactic nuclei Astronomical models Centroids Continuum radiation Emission lines Galaxies High-redshift galaxies Intergalactic media Photons Polls & surveys Quasars Red shift Reionization Space telescopes Spectral energy distribution Star & galaxy formation Star formation Stellar models Wavelengths |
| title | CDFS-6664: A Candidate of Lyman-continuum Emission at z ∼ 3.8 Detected by the Hubble Deep UV Legacy Survey |
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