Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions
We present galaxy MACS0416-Y1 at z _spec = 8.312 as observed by the CAnadian NIRISS Unbiased Cluster Survey. MACS0416-Y1 has been shown to have extreme dust properties; thus, we study the physical properties and star formation histories of its resolved components. Overall, we find that MACS0416-Y1 i...
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2024-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/ad9741 |
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| author | Anishya Harshan Roberta Tripodi Nicholas S. Martis Gregor Rihtaršič Maruša Bradač Yoshihisa Asada Gabe Brammer Guillaume Desprez Vince Estrada-Carpenter Jasleen Matharu Vladan Markov Adam Muzzin Lamiya Mowla Gaël Noirot Ghassan T. E. Sarrouh Marcin Sawicki Victoria Strait Chris Willott |
| author_facet | Anishya Harshan Roberta Tripodi Nicholas S. Martis Gregor Rihtaršič Maruša Bradač Yoshihisa Asada Gabe Brammer Guillaume Desprez Vince Estrada-Carpenter Jasleen Matharu Vladan Markov Adam Muzzin Lamiya Mowla Gaël Noirot Ghassan T. E. Sarrouh Marcin Sawicki Victoria Strait Chris Willott |
| author_sort | Anishya Harshan |
| collection | DOAJ |
| description | We present galaxy MACS0416-Y1 at z _spec = 8.312 as observed by the CAnadian NIRISS Unbiased Cluster Survey. MACS0416-Y1 has been shown to have extreme dust properties; thus, we study the physical properties and star formation histories of its resolved components. Overall, we find that MACS0416-Y1 is undergoing a star formation burst in three resolved clumps. The central clump is less massive compared to the other clumps and possibly formed in the merging process of the two larger clumps. Although the star formation history indicates an ongoing star formation burst, this gas-rich galaxy shows comparable star formation efficiency to cosmic noon galaxies. Using NIRSpec prism spectroscopy, we measure metallicity, $12+\mathrm{log}{\rm{(O/H)}}=7.76\pm 0.03$ , ionization parameter, $\mathrm{log}U=-2.48\pm 0.03$ , and electron temperature T _e = 18000 ± 4000 K. The emission line ratios of the galaxy indicate an evolved interstellar medium similar to z ∼ 2 star-forming galaxies. Further, we find possible presence of ionization from an active galactic nucleus (AGN) using emission line diagnostics; however, we do not detect a broad-line component in the H β emission line. As this gas-rich galaxy is undergoing a major merger, we hypothesize that the high dust temperature in MACS0416-Y1 is caused by the star formation burst or a possible narrow-line AGN. |
| format | Article |
| id | doaj-art-425df83c808f4ddb83508a2fc5f8a071 |
| institution | DOAJ |
| issn | 2041-8205 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal Letters |
| spelling | doaj-art-425df83c808f4ddb83508a2fc5f8a0712025-08-20T03:17:18ZengIOP PublishingThe Astrophysical Journal Letters2041-82052024-01-019772L3610.3847/2041-8213/ad9741Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust ConditionsAnishya Harshan0https://orcid.org/0000-0001-9414-6382Roberta Tripodi1https://orcid.org/0000-0002-9909-3491Nicholas S. Martis2https://orcid.org/0000-0003-3243-9969Gregor Rihtaršič3https://orcid.org/0009-0009-4388-898XMaruša Bradač4https://orcid.org/0000-0001-5984-0395Yoshihisa Asada5https://orcid.org/0000-0003-3983-5438Gabe Brammer6https://orcid.org/0000-0003-2680-005XGuillaume Desprez7https://orcid.org/0000-0001-8325-1742Vince Estrada-Carpenter8Jasleen Matharu9https://orcid.org/0000-0002-7547-3385Vladan Markov10https://orcid.org/0000-0002-5694-6124Adam Muzzin11Lamiya Mowla12https://orcid.org/0000-0002-8530-9765Gaël Noirot13Ghassan T. E. Sarrouh14https://orcid.org/0000-0001-8830-2166Marcin Sawicki15https://orcid.org/0000-0002-7712-7857Victoria Strait16https://orcid.org/0000-0002-6338-7295Chris Willott17https://orcid.org/0000-0002-4201-7367University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, SloveniaUniversity of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, SloveniaUniversity of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, SloveniaUniversity of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, SloveniaUniversity of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia; Department of Physics and Astronomy, University of California Davis , 1 Shields Avenue, Davis, CA 95616, USADepartment of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia B3H 3C3, Canada; Department of Astronomy, Kyoto University , Sakyo-ku, Kyoto 606-8502, JapanCosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen N, DenmarkDepartment of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia B3H 3C3, CanadaDepartment of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia B3H 3C3, CanadaCosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen N, DenmarkUniversity of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, SloveniaDepartment of Physics and Astronomy, York University , 4700 Keele St. Toronto, Ontario, M3J 1P3, CanadaWhitin Observatory , Department of Physics and Astronomy, Wellesley College, 106 Central Street, Wellesley, MA 02481, USA; Dunlap Institute for Astronomy and Astrophysics , 50 St. George Street, Toronto, Ontario M5S 3H4, CanadaDepartment of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia B3H 3C3, CanadaDepartment of Physics and Astronomy, York University , 4700 Keele St. Toronto, Ontario, M3J 1P3, CanadaDepartment of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia B3H 3C3, CanadaCosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen N, DenmarkNRC Herzberg , 5071 West Saanich Rd, Victoria, BC V9E 2E7, CanadaWe present galaxy MACS0416-Y1 at z _spec = 8.312 as observed by the CAnadian NIRISS Unbiased Cluster Survey. MACS0416-Y1 has been shown to have extreme dust properties; thus, we study the physical properties and star formation histories of its resolved components. Overall, we find that MACS0416-Y1 is undergoing a star formation burst in three resolved clumps. The central clump is less massive compared to the other clumps and possibly formed in the merging process of the two larger clumps. Although the star formation history indicates an ongoing star formation burst, this gas-rich galaxy shows comparable star formation efficiency to cosmic noon galaxies. Using NIRSpec prism spectroscopy, we measure metallicity, $12+\mathrm{log}{\rm{(O/H)}}=7.76\pm 0.03$ , ionization parameter, $\mathrm{log}U=-2.48\pm 0.03$ , and electron temperature T _e = 18000 ± 4000 K. The emission line ratios of the galaxy indicate an evolved interstellar medium similar to z ∼ 2 star-forming galaxies. Further, we find possible presence of ionization from an active galactic nucleus (AGN) using emission line diagnostics; however, we do not detect a broad-line component in the H β emission line. As this gas-rich galaxy is undergoing a major merger, we hypothesize that the high dust temperature in MACS0416-Y1 is caused by the star formation burst or a possible narrow-line AGN.https://doi.org/10.3847/2041-8213/ad9741High-redshift galaxiesStrong gravitational lensingReionizationActive galaxies |
| spellingShingle | Anishya Harshan Roberta Tripodi Nicholas S. Martis Gregor Rihtaršič Maruša Bradač Yoshihisa Asada Gabe Brammer Guillaume Desprez Vince Estrada-Carpenter Jasleen Matharu Vladan Markov Adam Muzzin Lamiya Mowla Gaël Noirot Ghassan T. E. Sarrouh Marcin Sawicki Victoria Strait Chris Willott Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions The Astrophysical Journal Letters High-redshift galaxies Strong gravitational lensing Reionization Active galaxies |
| title | Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions |
| title_full | Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions |
| title_fullStr | Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions |
| title_full_unstemmed | Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions |
| title_short | Detailed Study of Stars and Gas in a z = 8.3 Massive Merger with Extreme Dust Conditions |
| title_sort | detailed study of stars and gas in a z 8 3 massive merger with extreme dust conditions |
| topic | High-redshift galaxies Strong gravitational lensing Reionization Active galaxies |
| url | https://doi.org/10.3847/2041-8213/ad9741 |
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