The UV-brightest Lyman continuum emitting star-forming galaxy
ABSTRACT We report the discovery of J0121+0025, an extremely luminous and young star-forming galaxy (MUV = −24.11, log[$L_{\rm Ly \alpha } / \rm erg~s^{-1}] = 43.8$) at z = 3.244 showing copious Lyman continuum (LyC) leakage ($f_{\rm esc, abs} \approx 40{{\ \rm per\ cent}}$). High signal-to-noise ra...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2021-10, Vol.507 (1), p.524-538 |
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| creator | Marques-Chaves, R Schaerer, D Álvarez-Márquez, J Colina, L Dessauges-Zavadsky, M Pérez-Fournon, I Saldana-Lopez, A Verhamme, A |
| description | ABSTRACT
We report the discovery of J0121+0025, an extremely luminous and young star-forming galaxy (MUV = −24.11, log[$L_{\rm Ly \alpha } / \rm erg~s^{-1}] = 43.8$) at z = 3.244 showing copious Lyman continuum (LyC) leakage ($f_{\rm esc, abs} \approx 40{{\ \rm per\ cent}}$). High signal-to-noise ratio rest-frame UV spectroscopy with the Gran Telescopio Canarias reveals a high significance (7.9σ) emission below the Lyman limit ( |
| doi_str_mv | 10.1093/mnras/stab2187 |
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We report the discovery of J0121+0025, an extremely luminous and young star-forming galaxy (MUV = −24.11, log[$L_{\rm Ly \alpha } / \rm erg~s^{-1}] = 43.8$) at z = 3.244 showing copious Lyman continuum (LyC) leakage ($f_{\rm esc, abs} \approx 40{{\ \rm per\ cent}}$). High signal-to-noise ratio rest-frame UV spectroscopy with the Gran Telescopio Canarias reveals a high significance (7.9σ) emission below the Lyman limit (<912 Å), with a flux density level f900 = 0.78 ± 0.10μJy, and strong P-Cygni in wind lines of O vi 1033 Å, N v 1240 Å, and C iv 1550 Å that are indicative of a young age of the starburst (<10 Myr). The spectrum is rich in stellar photospheric features, for which a significant contribution of an AGN at these wavelengths is ruled out. Low-ionization interstellar medium (ISM) absorption lines are also detected, but are weak ($EW_{0} \rm \simeq 1$ Å) and show large residual intensities, suggesting a clumpy geometry of the gas with a non-unity covering fraction or a highly ionized ISM. The contribution of a foreground and AGN contamination to the LyC signal is unlikely. Deep optical to Spitzer/IRAC 4.5 μm imaging show that the spectral energy distribution of J0121+0025 is dominated by the emission of the young starburst, with log($M_{\star }^{\rm burst}/M_{\odot }) = 9.9\pm 0.1$ and $\rm SFR = 981\pm 232$ M⊙ yr−1. J0121+0025 is the most powerful LyC emitter known among the star-forming galaxy population. The discovery of such luminous and young starburst leaking LyC radiation suggests that a significant fraction of LyC photons can escape in sources with a wide range of UV luminosities and are not restricted to the faintest ones as previously thought. These findings might shed further light on the role of luminous starbursts to the cosmic reionization.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stab2187</identifier><language>eng</language><publisher>London: Oxford University Press</publisher><subject>Active galactic nuclei ; Emission ; Emitters ; Flux density ; Galaxies ; Interstellar gas ; Interstellar matter ; Ionization ; Photosphere ; Signal to noise ratio ; Spectral energy distribution ; Star formation</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2021-10, Vol.507 (1), p.524-538</ispartof><rights>2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society 2021</rights><rights>2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c367t-b35ed25269e4863a81a3ec75c004cdaabc700f3ca6089fe4e3e2ada8ce2fc4bc3</citedby><cites>FETCH-LOGICAL-c367t-b35ed25269e4863a81a3ec75c004cdaabc700f3ca6089fe4e3e2ada8ce2fc4bc3</cites><orcidid>0000-0001-8442-1846 ; 0000-0001-8419-3062</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1604,27924,27925</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stab2187$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Marques-Chaves, R</creatorcontrib><creatorcontrib>Schaerer, D</creatorcontrib><creatorcontrib>Álvarez-Márquez, J</creatorcontrib><creatorcontrib>Colina, L</creatorcontrib><creatorcontrib>Dessauges-Zavadsky, M</creatorcontrib><creatorcontrib>Pérez-Fournon, I</creatorcontrib><creatorcontrib>Saldana-Lopez, A</creatorcontrib><creatorcontrib>Verhamme, A</creatorcontrib><title>The UV-brightest Lyman continuum emitting star-forming galaxy</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
We report the discovery of J0121+0025, an extremely luminous and young star-forming galaxy (MUV = −24.11, log[$L_{\rm Ly \alpha } / \rm erg~s^{-1}] = 43.8$) at z = 3.244 showing copious Lyman continuum (LyC) leakage ($f_{\rm esc, abs} \approx 40{{\ \rm per\ cent}}$). High signal-to-noise ratio rest-frame UV spectroscopy with the Gran Telescopio Canarias reveals a high significance (7.9σ) emission below the Lyman limit (<912 Å), with a flux density level f900 = 0.78 ± 0.10μJy, and strong P-Cygni in wind lines of O vi 1033 Å, N v 1240 Å, and C iv 1550 Å that are indicative of a young age of the starburst (<10 Myr). The spectrum is rich in stellar photospheric features, for which a significant contribution of an AGN at these wavelengths is ruled out. Low-ionization interstellar medium (ISM) absorption lines are also detected, but are weak ($EW_{0} \rm \simeq 1$ Å) and show large residual intensities, suggesting a clumpy geometry of the gas with a non-unity covering fraction or a highly ionized ISM. The contribution of a foreground and AGN contamination to the LyC signal is unlikely. Deep optical to Spitzer/IRAC 4.5 μm imaging show that the spectral energy distribution of J0121+0025 is dominated by the emission of the young starburst, with log($M_{\star }^{\rm burst}/M_{\odot }) = 9.9\pm 0.1$ and $\rm SFR = 981\pm 232$ M⊙ yr−1. J0121+0025 is the most powerful LyC emitter known among the star-forming galaxy population. The discovery of such luminous and young starburst leaking LyC radiation suggests that a significant fraction of LyC photons can escape in sources with a wide range of UV luminosities and are not restricted to the faintest ones as previously thought. These findings might shed further light on the role of luminous starbursts to the cosmic reionization.</description><subject>Active galactic nuclei</subject><subject>Emission</subject><subject>Emitters</subject><subject>Flux density</subject><subject>Galaxies</subject><subject>Interstellar gas</subject><subject>Interstellar matter</subject><subject>Ionization</subject><subject>Photosphere</subject><subject>Signal to noise ratio</subject><subject>Spectral energy distribution</subject><subject>Star formation</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFkL1PwzAQxS0EEqWwMkdiYnB79iWOMzCgii-pEkvLal1cp03VJMVOJPrf41KYme5Oeu_d04-xWwETAQVOm9ZTmIaeSil0fsZGAlXGZaHUORsBYMZ1LsQluwphCwApSjViD4uNS5YfvPT1etO70CfzQ0NtYru2r9thaBLX1H1c10lM9rzqfHM81rSjr8M1u6hoF9zN7xyz5fPTYvbK5-8vb7PHObeo8p6XmLmVzKQqXKoVkhaEzuaZjS3siqi0OUCFlhToonKpQydpRdo6Wdm0tDhmd6fcve8-h9jSbLvBt_GlQYECZAqFjqrJSWV9F4J3ldn7uiF_MALMEZH5QWT-EEXD_cnQDfv_tN8OBmry</recordid><startdate>20211001</startdate><enddate>20211001</enddate><creator>Marques-Chaves, R</creator><creator>Schaerer, D</creator><creator>Álvarez-Márquez, J</creator><creator>Colina, L</creator><creator>Dessauges-Zavadsky, M</creator><creator>Pérez-Fournon, I</creator><creator>Saldana-Lopez, A</creator><creator>Verhamme, A</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0001-8442-1846</orcidid><orcidid>https://orcid.org/0000-0001-8419-3062</orcidid></search><sort><creationdate>20211001</creationdate><title>The UV-brightest Lyman continuum emitting star-forming galaxy</title><author>Marques-Chaves, R ; Schaerer, D ; Álvarez-Márquez, J ; Colina, L ; Dessauges-Zavadsky, M ; Pérez-Fournon, I ; Saldana-Lopez, A ; Verhamme, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c367t-b35ed25269e4863a81a3ec75c004cdaabc700f3ca6089fe4e3e2ada8ce2fc4bc3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Active galactic nuclei</topic><topic>Emission</topic><topic>Emitters</topic><topic>Flux density</topic><topic>Galaxies</topic><topic>Interstellar gas</topic><topic>Interstellar matter</topic><topic>Ionization</topic><topic>Photosphere</topic><topic>Signal to noise ratio</topic><topic>Spectral energy distribution</topic><topic>Star formation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Marques-Chaves, R</creatorcontrib><creatorcontrib>Schaerer, D</creatorcontrib><creatorcontrib>Álvarez-Márquez, J</creatorcontrib><creatorcontrib>Colina, L</creatorcontrib><creatorcontrib>Dessauges-Zavadsky, M</creatorcontrib><creatorcontrib>Pérez-Fournon, I</creatorcontrib><creatorcontrib>Saldana-Lopez, A</creatorcontrib><creatorcontrib>Verhamme, A</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Marques-Chaves, R</au><au>Schaerer, D</au><au>Álvarez-Márquez, J</au><au>Colina, L</au><au>Dessauges-Zavadsky, M</au><au>Pérez-Fournon, I</au><au>Saldana-Lopez, A</au><au>Verhamme, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The UV-brightest Lyman continuum emitting star-forming galaxy</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2021-10-01</date><risdate>2021</risdate><volume>507</volume><issue>1</issue><spage>524</spage><epage>538</epage><pages>524-538</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>ABSTRACT
We report the discovery of J0121+0025, an extremely luminous and young star-forming galaxy (MUV = −24.11, log[$L_{\rm Ly \alpha } / \rm erg~s^{-1}] = 43.8$) at z = 3.244 showing copious Lyman continuum (LyC) leakage ($f_{\rm esc, abs} \approx 40{{\ \rm per\ cent}}$). High signal-to-noise ratio rest-frame UV spectroscopy with the Gran Telescopio Canarias reveals a high significance (7.9σ) emission below the Lyman limit (<912 Å), with a flux density level f900 = 0.78 ± 0.10μJy, and strong P-Cygni in wind lines of O vi 1033 Å, N v 1240 Å, and C iv 1550 Å that are indicative of a young age of the starburst (<10 Myr). The spectrum is rich in stellar photospheric features, for which a significant contribution of an AGN at these wavelengths is ruled out. Low-ionization interstellar medium (ISM) absorption lines are also detected, but are weak ($EW_{0} \rm \simeq 1$ Å) and show large residual intensities, suggesting a clumpy geometry of the gas with a non-unity covering fraction or a highly ionized ISM. The contribution of a foreground and AGN contamination to the LyC signal is unlikely. Deep optical to Spitzer/IRAC 4.5 μm imaging show that the spectral energy distribution of J0121+0025 is dominated by the emission of the young starburst, with log($M_{\star }^{\rm burst}/M_{\odot }) = 9.9\pm 0.1$ and $\rm SFR = 981\pm 232$ M⊙ yr−1. J0121+0025 is the most powerful LyC emitter known among the star-forming galaxy population. The discovery of such luminous and young starburst leaking LyC radiation suggests that a significant fraction of LyC photons can escape in sources with a wide range of UV luminosities and are not restricted to the faintest ones as previously thought. These findings might shed further light on the role of luminous starbursts to the cosmic reionization.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stab2187</doi><tpages>15</tpages><orcidid>https://orcid.org/0000-0001-8442-1846</orcidid><orcidid>https://orcid.org/0000-0001-8419-3062</orcidid></addata></record> |
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| subjects | Active galactic nuclei Emission Emitters Flux density Galaxies Interstellar gas Interstellar matter Ionization Photosphere Signal to noise ratio Spectral energy distribution Star formation |
| title | The UV-brightest Lyman continuum emitting star-forming galaxy |
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