The Astrophysical Journal Letters (Jan 2024)
Star Formation at the Epoch of Reionization with CANUCS: The Ages of Stellar Populations in MACS1149-JD1
- Maruša Bradač,
- Victoria Strait,
- Lamiya Mowla,
- Kartheik G. Iyer,
- Gaël Noirot,
- Chris Willott,
- Gabe Brammer,
- Roberto Abraham,
- Yoshihisa Asada,
- Guillaume Desprez,
- Vince Estrada-Carpenter,
- Anishya Harshan,
- Nicholas S. Martis,
- Jasleen Matharu,
- Adam Muzzin,
- Gregor Rihtaršič,
- Ghassan T. E. Sarrouh,
- Marcin Sawicki
Affiliations
- Maruša Bradač
- ORCiD
- University 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, USA
- Victoria Strait
- ORCiD
- Cosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen N, Denmark
- Lamiya Mowla
- ORCiD
- Whitin 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, Canada
- Kartheik G. Iyer
- ORCiD
- Dunlap Institute for Astronomy and Astrophysics , 50 St. George Street, Toronto, Ontario, M5S 3H4, Canada
- Gaël Noirot
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada
- Chris Willott
- ORCiD
- NRC Herzberg , 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
- Gabe Brammer
- ORCiD
- Cosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen N, Denmark
- Roberto Abraham
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St. George Street, Toronto, Ontario M5S 3H4, Canada
- Yoshihisa Asada
- ORCiD
- Department 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, Japan
- Guillaume Desprez
- ORCiD
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada
- Vince Estrada-Carpenter
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada
- Anishya Harshan
- ORCiD
- University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia
- Nicholas S. Martis
- ORCiD
- University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia; Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada; National Research Council of Canada, Herzberg Astronomy & Astrophysics Research Centre , 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
- Jasleen Matharu
- ORCiD
- Cosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen N, Denmark
- Adam Muzzin
- Department of Physics and Astronomy, York University , 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada
- Gregor Rihtaršič
- ORCiD
- University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia
- Ghassan T. E. Sarrouh
- ORCiD
- Department of Physics and Astronomy, York University , 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada
- Marcin Sawicki
- ORCiD
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, Nova Scotia, B3H 3C3, Canada
- DOI
- https://doi.org/10.3847/2041-8213/ad0e73
- Journal volume & issue
-
Vol. 961,
no. 1
p. L21
Abstract
We present measurements of stellar populations properties of a z = 9.1 gravitationally lensed galaxy MACS1149-JD1 using deep James Webb Space Telescope NIRISS slitless spectroscopy as well as NIRISS and NIRCam imaging from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). The galaxy is split into four components. Three magnified ( μ ∼ 11) star-forming components are unresolved, giving intrinsic sizes of <25 pc. In addition, the underlying extended component contains the bulk of the stellar mass, formed the majority of its stars ∼50 Myr earlier than the other three components, and is not the site of the most active star formation currently. The NIRISS and NIRCam resolved photometry does not confirm a strong Balmer break previously seen in Spitzer. The NIRISS grism spectrum has been extracted for the entire galaxy and shows a clear continuum and Lyman break, with no Ly α detected.
Keywords
