Cold dust and low [O <scp>iii</scp>]/[C <scp>ii</scp>] ratios: an evolved star-forming population at redshift 7
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- Hiddo S B Algera
- Hiroshima Astrophysical Science Center, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526 Hiroshima , Japan
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- Hanae Inami
- Hiroshima Astrophysical Science Center, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526 Hiroshima , Japan
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- Laura Sommovigo
- Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa , Italy
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- Yoshinobu Fudamoto
- National Astronomical Observatory of Japan , 2-21-1, Osawa, Mitaka, Tokyo , Japan
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- Raffaella Schneider
- Dipartimento di Fisica, Sapienza, Universita di Roma , Piazzale Aldo Moro 5, I-00185 Roma , Italy
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- Luca Graziani
- Dipartimento di Fisica, Sapienza, Universita di Roma , Piazzale Aldo Moro 5, I-00185 Roma , Italy
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- Pratika Dayal
- Kapteyn Astronomical Institute, University of Groningen , P.O. Box 800, 9700 AV Groningen , The Netherlands
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- Rychard Bouwens
- Leiden Observatory, Leiden University , NL-2300 RA Leiden , Netherlands
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- Manuel Aravena
- Instituto de Estudios Astrofísicos, Facultad de Ingeniería y Ciencias, Universidad Diego Portales , Av. Ejército 441, Santiago , Chile
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- Elisabete da Cunha
- International Centre for Radio Astronomy Research, University of Western Australia , 35 Stirling Hwy, Crawley, 26WA 6009 , Australia
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- Andrea Ferrara
- Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa , Italy
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- Alexander P S Hygate
- Leiden Observatory, Leiden University , NL-2300 RA Leiden , Netherlands
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- Ivana van Leeuwen
- Leiden Observatory, Leiden University , NL-2300 RA Leiden , Netherlands
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- Ilse De Looze
- Sterrenkundig Observatorium, Ghent University , Krijgslaan 281 - S9, 9000 Gent , Belgium
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- Marco Palla
- Sterrenkundig Observatorium, Ghent University , Krijgslaan 281 - S9, 9000 Gent , Belgium
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- Andrea Pallottini
- Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa , Italy
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- Renske Smit
- Astrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF , UK
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- Mauro Stefanon
- Departament d’Astronomia i Astrofìsica, Universitat de València , C. Dr Moliner 50, E-46100 Burjassot, València , Spain
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- Michael Topping
- Steward Observatory, University of Arizona , 933 N Cherry Ave, Tucson, AZ 85721 , USA
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- Paul P van der Werf
- Leiden Observatory, Leiden University , NL-2300 RA Leiden , Netherlands
書誌事項
- 公開日
- 2023-10-12
- 資源種別
- journal article
- 権利情報
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- https://creativecommons.org/licenses/by-nc-nd/4.0/
- DOI
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- 10.1093/mnras/stad3111
- 10.48550/arxiv.2301.09659
- 公開者
- Oxford University Press (OUP)
この論文をさがす
説明
<jats:title>ABSTRACT</jats:title> <jats:p>We present new ALMA Band 8 (rest-frame $90 \ \mu$m) continuum observations of three massive ($M_\star \approx 10^{10}\ \mathrm{ M}_\odot$) galaxies at z ≈ 7 previously detected in [C ii]$158 \ \mu$m and underlying dust continuum emission in the Reionization Era Bright Emission Line Survey (REBELS). We detect dust emission from two of our targets in Band 8 (REBELS-25 and REBELS-38), while REBELS-12 remains undetected. Through optically thin modified blackbody fitting, we determine dust temperatures of $T_\mathrm{dust}\approx 30-35\,$ K in both of the dual-band detected targets, indicating they are colder than most known galaxies at z ∼ 7. Moreover, their inferred dust masses are large ($M_\mathrm{dust}\approx 10^{8}\ \mathrm{ M}_\odot$), albeit still consistent with models of high-redshift dust production. We furthermore target and detect [O iii]$88 \ \mu$m emission in both REBELS-12 and REBELS-25, and find $L_\mathrm{[O\, III]}/L_\mathrm{[C\, II]}\approx 1-1.5$ – low compared to the $L_\mathrm{[O\, \rm{\small III}]}/L_\mathrm{[C\, \rm{\small II}]}\gtrsim 2-10$ observed in the known z ≳ 6 population thus far. We argue the lower line ratios are due to a comparatively weaker ionizing radiation field resulting from the less starbursty nature of our targets, although the possibility of REBELS-12 being a merger of an [O iii]-bright and [O iii]-faint component prevents the unambiguous interpretation of its [O iii]/[C ii] ratio. Nevertheless, a low burstiness forms a natural explanation for the cold dust temperatures and low $\mathrm{[O\, \rm{\small III}]}\lambda \lambda 4959,5007+\mathrm{H} \, \beta$ equivalent widths of REBELS-25 and REBELS-38. Overall, these observations provide evidence for the existence of a massive, dust-rich galaxy population at z ≈ 7 which has previously experienced vigorous star formation, but is currently forming stars in a steady, as opposed to bursty, manner.</jats:p>
収録刊行物
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- Monthly Notices of the Royal Astronomical Society
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Monthly Notices of the Royal Astronomical Society 527 (3), 6867-6887, 2023-10-12
Oxford University Press (OUP)
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キーワード
- C-II EMISSION
- GREATER-THAN 6
- INTERSTELLAR-MEDIUM
- Galaxies: high-redshift
- ALMA REBELS SURVEY
- Galaxies: evolution
- FOS: Physical sciences
- Astronomy and Astrophysics
- galaxies evolution; galaxies high-redshift; submillimeter galaxies; astrophysics; astrophysics of galaxies
- Astrophysics - Astrophysics of Galaxies
- MOLECULAR GAS MASS
- Submillimetre: galaxies
- LYMAN-BREAK GALAXIES
- Physics and Astronomy
- Space and Planetary Science
- LUMINOSITY FUNCTION
- galaxies: high-redshift
- galaxies: evolution; galaxies: high-redshift; submillimeter: galaxies
- Astrophysics of Galaxies (astro-ph.GA)
- 158 MU-M
- BIG 3 DRAGONS
- O III
- galaxies: evolution
- submillimetre: galaxies
詳細情報 詳細情報について
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- CRID
- 1360021390560391936
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- ISSN
- 13652966
- 00358711
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
