ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy
We present high-resolution (≲0.″1) Atacama Large Millimeter/submillimeter Array observations of the strongly lensed galaxy HATLASJ113526.2-01460 at redshift z ∼ 3.1, discovered in the GAMA 12th field of the Herschel-ATLAS survey. This gravitationally lensed system is remarkably peculiar, in that nei...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/aca53f |
| _version_ | 1797702091229102080 |
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| author | Marika Giulietti Andrea Lapi Marcella Massardi Meriem Behiri Martina Torsello Quirino D’Amato Tommaso Ronconi Francesca Perrotta Alessandro Bressan |
| author_facet | Marika Giulietti Andrea Lapi Marcella Massardi Meriem Behiri Martina Torsello Quirino D’Amato Tommaso Ronconi Francesca Perrotta Alessandro Bressan |
| author_sort | Marika Giulietti |
| collection | DOAJ |
| description | We present high-resolution (≲0.″1) Atacama Large Millimeter/submillimeter Array observations of the strongly lensed galaxy HATLASJ113526.2-01460 at redshift z ∼ 3.1, discovered in the GAMA 12th field of the Herschel-ATLAS survey. This gravitationally lensed system is remarkably peculiar, in that neither the background source nor the foreground lens show a clearly detected optical/near-IR Hubble Space Telescope-J band emission. We perform accurate lens modeling and source morphology reconstruction in three different (sub)millimeter continuum bands and in the C[ ii ] and CO(8−7) spectral lines. The modeling indicates a foreground lensing (likely elliptical) galaxy with mass ≳10 ^11 M _⊙ at z ≳ 1.5, while the source (sub)millimeter continuum and line emissions are amplified by factors μ ∼ 6–13. We estimate extremely compact sizes—≲0.5 kpc for the star-forming region and ≲1 kpc for the gas component—with no clear evidence of rotation or ongoing merging events. We perform broadband SED fitting and retrieve the intrinsic demagnified physical properties of the source, which is found to feature a very high star formation rate, ≳10 ^3 M _⊙ yr ^−1 , which, given the compact sizes, is on the verge of the Eddington limit for starbursts; the radio luminosity at 6 cm from the available EVLA observations is consistent with star formation activity. The galaxy is found to be extremely rich in gas ∼10 ^11 M _⊙ and dust ≳10 ^9 M _⊙ . The stellar content ≲10 ^11 M _⊙ places the source well above the main sequence of star-forming galaxies, indicating that the starburst is rather young, with an estimated age ∼10 ^8 yr. Our results indicate that the overall properties of HATLASJ113526.2-01460 are consistently explained by in situ galaxy formation and evolution scenarios. |
| first_indexed | 2024-03-12T04:45:10Z |
| format | Article |
| id | doaj.art-8c9cabc485ad4b9b97a69d3122b75ba7 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:45:10Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-8c9cabc485ad4b9b97a69d3122b75ba72023-09-03T09:29:24ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01943215110.3847/1538-4357/aca53fALMA Resolves the First Strongly Lensed Optical/Near-IR-dark GalaxyMarika Giulietti0https://orcid.org/0000-0002-1847-4496Andrea Lapi1https://orcid.org/0000-0002-4882-1735Marcella Massardi2https://orcid.org/0000-0002-0375-8330Meriem Behiri3https://orcid.org/0000-0002-6444-8547Martina Torsello4https://orcid.org/0000-0001-9301-5209Quirino D’Amato5https://orcid.org/0000-0002-9948-0897Tommaso Ronconi6https://orcid.org/0000-0002-3515-6801Francesca Perrotta7https://orcid.org/0000-0001-9808-0843Alessandro Bressan8https://orcid.org/0000-0002-7922-8440SISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.it; INAF - Osservatorio di Astrofisica e Scienza dello Spazio , Via Gobetti 93/3, I-40129 Bologna, ItalySISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.it; IFPU - Institute for fundamental physics of the Universe , Via Beirut 2, I-34014 Trieste, Italy; INFN-Sezione di Trieste , via Valerio 2, I-34127 Trieste, Italy; INAF/IRA, Istituto di Radioastronomia , Via Piero Gobetti 101, I-40129 Bologna, ItalySISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.it; INAF/IRA, Istituto di Radioastronomia , Via Piero Gobetti 101, I-40129 Bologna, Italy; INAF, Istituto di Radioastronomia - Italian ARC , Via Piero Gobetti 101, I-40129 Bologna, ItalySISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.itSISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.itSISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.it; INAF - Osservatorio di Astrofisica e Scienza dello Spazio , Via Gobetti 93/3, I-40129 Bologna, ItalySISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.it; INFN-Sezione di Trieste , via Valerio 2, I-34127 Trieste, Italy; IFPU , Via Beirut 2, I-34014 Trieste, ItalySISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.itSISSA , Via Bonomea 265, I-34136 Trieste, Italy ; mgiuliet@sissa.itWe present high-resolution (≲0.″1) Atacama Large Millimeter/submillimeter Array observations of the strongly lensed galaxy HATLASJ113526.2-01460 at redshift z ∼ 3.1, discovered in the GAMA 12th field of the Herschel-ATLAS survey. This gravitationally lensed system is remarkably peculiar, in that neither the background source nor the foreground lens show a clearly detected optical/near-IR Hubble Space Telescope-J band emission. We perform accurate lens modeling and source morphology reconstruction in three different (sub)millimeter continuum bands and in the C[ ii ] and CO(8−7) spectral lines. The modeling indicates a foreground lensing (likely elliptical) galaxy with mass ≳10 ^11 M _⊙ at z ≳ 1.5, while the source (sub)millimeter continuum and line emissions are amplified by factors μ ∼ 6–13. We estimate extremely compact sizes—≲0.5 kpc for the star-forming region and ≲1 kpc for the gas component—with no clear evidence of rotation or ongoing merging events. We perform broadband SED fitting and retrieve the intrinsic demagnified physical properties of the source, which is found to feature a very high star formation rate, ≳10 ^3 M _⊙ yr ^−1 , which, given the compact sizes, is on the verge of the Eddington limit for starbursts; the radio luminosity at 6 cm from the available EVLA observations is consistent with star formation activity. The galaxy is found to be extremely rich in gas ∼10 ^11 M _⊙ and dust ≳10 ^9 M _⊙ . The stellar content ≲10 ^11 M _⊙ places the source well above the main sequence of star-forming galaxies, indicating that the starburst is rather young, with an estimated age ∼10 ^8 yr. Our results indicate that the overall properties of HATLASJ113526.2-01460 are consistently explained by in situ galaxy formation and evolution scenarios.https://doi.org/10.3847/1538-4357/aca53fStrong gravitational lensingHigh-redshift galaxiesGalaxy formationSubmillimeter astronomy |
| spellingShingle | Marika Giulietti Andrea Lapi Marcella Massardi Meriem Behiri Martina Torsello Quirino D’Amato Tommaso Ronconi Francesca Perrotta Alessandro Bressan ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy The Astrophysical Journal Strong gravitational lensing High-redshift galaxies Galaxy formation Submillimeter astronomy |
| title | ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy |
| title_full | ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy |
| title_fullStr | ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy |
| title_full_unstemmed | ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy |
| title_short | ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy |
| title_sort | alma resolves the first strongly lensed optical near ir dark galaxy |
| topic | Strong gravitational lensing High-redshift galaxies Galaxy formation Submillimeter astronomy |
| url | https://doi.org/10.3847/1538-4357/aca53f |
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