The Bright and Dark Sides of High-redshift Starburst Galaxies from Herschel and Subaru Observations
We present rest-frame optical spectra from the FMOS-COSMOS survey of 12 z ∼ 1.6 Herschel starburst galaxies, with star formation rate (SFR) elevated by ×8, on average, above the star-forming main sequence (MS). Comparing the H to IR luminosity ratio and the Balmer decrement, we find that the optical...
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| creator | Puglisi, A. Daddi, E. Renzini, A. Rodighiero, G. Silverman, J. D. Kashino, D. Rodríguez-Muñoz, L. Mancini, C. Mainieri, V. Man, A. Franceschini, A. Valentino, F. Calabrò, A. Jin, S. Darvish, B. Maier, C. Kartaltepe, J. S. Sanders, D. B. |
| description | We present rest-frame optical spectra from the FMOS-COSMOS survey of 12 z ∼ 1.6 Herschel starburst galaxies, with star formation rate (SFR) elevated by ×8, on average, above the star-forming main sequence (MS). Comparing the H to IR luminosity ratio and the Balmer decrement, we find that the optically thin regions of the sources contain on average only ∼10% of the total SFR, whereas ∼90% come from an extremely obscured component that is revealed only by far-IR observations and is optically thick even in H . We measure the [N ii]6583/H ratio, suggesting that the less obscured regions have a metal content similar to that of the MS population at the same stellar masses and redshifts. However, our objects appear to be metal-rich outliers from the metallicity-SFR anticorrelation observed at fixed stellar mass for the MS population. The [S ii]6732/[S ii]6717 ratio from the average spectrum indicates an electron density ne ∼ 1100 cm−3 , larger than what was estimated for MS galaxies but only at the 1.5 level. Our results provide supporting evidence that high-z MS outliers are analogous of local ULIRGs and are consistent with a major-merger origin for the starburst event. |
| doi_str_mv | 10.3847/2041-8213/aa66c9 |
| format | Article |
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D. ; Kashino, D. ; Rodríguez-Muñoz, L. ; Mancini, C. ; Mainieri, V. ; Man, A. ; Franceschini, A. ; Valentino, F. ; Calabrò, A. ; Jin, S. ; Darvish, B. ; Maier, C. ; Kartaltepe, J. S. ; Sanders, D. B.</creator><creatorcontrib>Puglisi, A. ; Daddi, E. ; Renzini, A. ; Rodighiero, G. ; Silverman, J. D. ; Kashino, D. ; Rodríguez-Muñoz, L. ; Mancini, C. ; Mainieri, V. ; Man, A. ; Franceschini, A. ; Valentino, F. ; Calabrò, A. ; Jin, S. ; Darvish, B. ; Maier, C. ; Kartaltepe, J. S. ; Sanders, D. B.</creatorcontrib><description>We present rest-frame optical spectra from the FMOS-COSMOS survey of 12 z ∼ 1.6 Herschel starburst galaxies, with star formation rate (SFR) elevated by ×8, on average, above the star-forming main sequence (MS). Comparing the H to IR luminosity ratio and the Balmer decrement, we find that the optically thin regions of the sources contain on average only ∼10% of the total SFR, whereas ∼90% come from an extremely obscured component that is revealed only by far-IR observations and is optically thick even in H . We measure the [N ii]6583/H ratio, suggesting that the less obscured regions have a metal content similar to that of the MS population at the same stellar masses and redshifts. However, our objects appear to be metal-rich outliers from the metallicity-SFR anticorrelation observed at fixed stellar mass for the MS population. The [S ii]6732/[S ii]6717 ratio from the average spectrum indicates an electron density ne ∼ 1100 cm−3 , larger than what was estimated for MS galaxies but only at the 1.5 level. Our results provide supporting evidence that high-z MS outliers are analogous of local ULIRGs and are consistent with a major-merger origin for the starburst event.</description><identifier>ISSN: 2041-8205</identifier><identifier>EISSN: 2041-8213</identifier><identifier>DOI: 10.3847/2041-8213/aa66c9</identifier><language>eng</language><publisher>United States: The American Astronomical Society</publisher><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; COMPARATIVE EVALUATIONS ; ELECTRON DENSITY ; ELECTRONS ; EVOLUTION ; GALAXIES ; galaxies: evolution ; galaxies: high-redshift ; galaxies: interactions ; galaxies: ISM ; galaxies: starburst ; infrared: galaxies ; INTERACTIONS ; LUMINOSITY ; MASS ; METALLICITY ; METALS ; Outliers (statistics) ; RED SHIFT ; SPECTRA ; Starburst galaxies ; STARS ; Stellar mass ; UNIVERSE</subject><ispartof>Astrophysical journal. Letters, 2017-04, Vol.838 (2), p.L18-L18</ispartof><rights>2017. The American Astronomical Society. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c513t-bb209c04477f41246d503e08c3a26560b3501cf967456a694de45cac257851db3</citedby><cites>FETCH-LOGICAL-c513t-bb209c04477f41246d503e08c3a26560b3501cf967456a694de45cac257851db3</cites><orcidid>0000-0002-0000-6977 ; 0000-0002-0192-5131 ; 0000-0003-4919-9017 ; 0000-0001-9369-1805 ; 0000-0001-6477-4011 ; 0000-0001-6405-2182 ; 0000-0001-9044-1747 ; 0000-0002-9415-2296 ; 0000-0002-4297-0561 ; 0000-0002-3331-9590 ; 0000-0002-1233-9998</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/aa66c9/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>230,314,780,784,885,27924,27925,38868,38890,53840,53867</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8213/aa66c9$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/22654504$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Puglisi, A.</creatorcontrib><creatorcontrib>Daddi, E.</creatorcontrib><creatorcontrib>Renzini, A.</creatorcontrib><creatorcontrib>Rodighiero, G.</creatorcontrib><creatorcontrib>Silverman, J. D.</creatorcontrib><creatorcontrib>Kashino, D.</creatorcontrib><creatorcontrib>Rodríguez-Muñoz, L.</creatorcontrib><creatorcontrib>Mancini, C.</creatorcontrib><creatorcontrib>Mainieri, V.</creatorcontrib><creatorcontrib>Man, A.</creatorcontrib><creatorcontrib>Franceschini, A.</creatorcontrib><creatorcontrib>Valentino, F.</creatorcontrib><creatorcontrib>Calabrò, A.</creatorcontrib><creatorcontrib>Jin, S.</creatorcontrib><creatorcontrib>Darvish, B.</creatorcontrib><creatorcontrib>Maier, C.</creatorcontrib><creatorcontrib>Kartaltepe, J. S.</creatorcontrib><creatorcontrib>Sanders, D. B.</creatorcontrib><title>The Bright and Dark Sides of High-redshift Starburst Galaxies from Herschel and Subaru Observations</title><title>Astrophysical journal. Letters</title><addtitle>APJL</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>We present rest-frame optical spectra from the FMOS-COSMOS survey of 12 z ∼ 1.6 Herschel starburst galaxies, with star formation rate (SFR) elevated by ×8, on average, above the star-forming main sequence (MS). Comparing the H to IR luminosity ratio and the Balmer decrement, we find that the optically thin regions of the sources contain on average only ∼10% of the total SFR, whereas ∼90% come from an extremely obscured component that is revealed only by far-IR observations and is optically thick even in H . We measure the [N ii]6583/H ratio, suggesting that the less obscured regions have a metal content similar to that of the MS population at the same stellar masses and redshifts. However, our objects appear to be metal-rich outliers from the metallicity-SFR anticorrelation observed at fixed stellar mass for the MS population. The [S ii]6732/[S ii]6717 ratio from the average spectrum indicates an electron density ne ∼ 1100 cm−3 , larger than what was estimated for MS galaxies but only at the 1.5 level. 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B.</creator><general>The American Astronomical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-0000-6977</orcidid><orcidid>https://orcid.org/0000-0002-0192-5131</orcidid><orcidid>https://orcid.org/0000-0003-4919-9017</orcidid><orcidid>https://orcid.org/0000-0001-9369-1805</orcidid><orcidid>https://orcid.org/0000-0001-6477-4011</orcidid><orcidid>https://orcid.org/0000-0001-6405-2182</orcidid><orcidid>https://orcid.org/0000-0001-9044-1747</orcidid><orcidid>https://orcid.org/0000-0002-9415-2296</orcidid><orcidid>https://orcid.org/0000-0002-4297-0561</orcidid><orcidid>https://orcid.org/0000-0002-3331-9590</orcidid><orcidid>https://orcid.org/0000-0002-1233-9998</orcidid></search><sort><creationdate>20170401</creationdate><title>The Bright and Dark Sides of High-redshift Starburst Galaxies from Herschel and Subaru Observations</title><author>Puglisi, A. ; Daddi, E. ; Renzini, A. ; Rodighiero, G. ; Silverman, J. 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B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Bright and Dark Sides of High-redshift Starburst Galaxies from Herschel and Subaru Observations</atitle><jtitle>Astrophysical journal. Letters</jtitle><stitle>APJL</stitle><addtitle>Astrophys. J. Lett</addtitle><date>2017-04-01</date><risdate>2017</risdate><volume>838</volume><issue>2</issue><spage>L18</spage><epage>L18</epage><pages>L18-L18</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>We present rest-frame optical spectra from the FMOS-COSMOS survey of 12 z ∼ 1.6 Herschel starburst galaxies, with star formation rate (SFR) elevated by ×8, on average, above the star-forming main sequence (MS). Comparing the H to IR luminosity ratio and the Balmer decrement, we find that the optically thin regions of the sources contain on average only ∼10% of the total SFR, whereas ∼90% come from an extremely obscured component that is revealed only by far-IR observations and is optically thick even in H . We measure the [N ii]6583/H ratio, suggesting that the less obscured regions have a metal content similar to that of the MS population at the same stellar masses and redshifts. However, our objects appear to be metal-rich outliers from the metallicity-SFR anticorrelation observed at fixed stellar mass for the MS population. The [S ii]6732/[S ii]6717 ratio from the average spectrum indicates an electron density ne ∼ 1100 cm−3 , larger than what was estimated for MS galaxies but only at the 1.5 level. 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| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COMPARATIVE EVALUATIONS ELECTRON DENSITY ELECTRONS EVOLUTION GALAXIES galaxies: evolution galaxies: high-redshift galaxies: interactions galaxies: ISM galaxies: starburst infrared: galaxies INTERACTIONS LUMINOSITY MASS METALLICITY METALS Outliers (statistics) RED SHIFT SPECTRA Starburst galaxies STARS Stellar mass UNIVERSE |
| title | The Bright and Dark Sides of High-redshift Starburst Galaxies from Herschel and Subaru Observations |
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