The Astrophysical Journal (Jan 2025)
CANUCS/Technicolor: JWST Medium-band Photometry Finds Half of the Star Formation at z > 7.5 Is Obscured
- Nicholas S. Martis,
- Sunna Withers,
- Maruša Bradač,
- Adam Muzzin,
- Giordano Felicioni,
- Roberto Abraham,
- Yoshihisa Asada,
- Gabe Brammer,
- Guillaume Desprez,
- Anishya Harshan,
- Kartheik G. Iyer,
- Naadiyah Jagga,
- Jon Judež,
- Danilo Marchesini,
- Vladan Markov,
- Rosa M. Mérida,
- Gaël Noirot,
- Gregor Rihtaršič,
- Ghassan T. E. Sarrouh,
- Marcin Sawicki,
- Victoria Strait,
- Roberta Tripodi,
- Chris Willott
Affiliations
- Nicholas S. Martis
- ORCiD
- University of Ljubljana , Faculty of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia ; [email protected]
- Sunna Withers
- ORCiD
- Department of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON M3J 1P3, Canada
- Maruša Bradač
- ORCiD
- University of Ljubljana , Faculty of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia ; [email protected]; Department of Physics and Astronomy, University of California Davis , 1 Shields Avenue, Davis, CA 95616, USA
- Adam Muzzin
- ORCiD
- Department of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON M3J 1P3, Canada
- Giordano Felicioni
- University of Ljubljana , Faculty of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia ; [email protected]
- Roberto Abraham
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 Saint George Street, Toronto, ON M5S 3H4, Canada
- Yoshihisa Asada
- ORCiD
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, NS B3H 3C3, Canada; Department of Astronomy, Kyoto University , Sakyo-ku, Kyoto 606-8502, Japan
- Gabe Brammer
- ORCiD
- Cosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen North, Denmark
- Guillaume Desprez
- ORCiD
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, NS B3H 3C3, Canada; Kapteyn Astronomical Institute, University of Groningen , P.O. Box 800, 9700AV Groningen, The Netherlands
- Anishya Harshan
- ORCiD
- University of Ljubljana , Faculty of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia ; [email protected]
- Kartheik G. Iyer
- ORCiD
- Dunlap Institute for Astronomy and Astrophysics , 50 Saint George Street, Toronto, ON M5S 3H4, Canada
- Naadiyah Jagga
- ORCiD
- Department of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON M3J 1P3, Canada
- Jon Judež
- University of Ljubljana , Faculty of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia ; [email protected]
- Danilo Marchesini
- ORCiD
- Department of Physics and Astronomy, Tufts University , 574 Boston Avenue, Medford, MA 02155, USA
- Vladan Markov
- ORCiD
- University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia
- Rosa M. Mérida
- ORCiD
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, NS B3H 3C3, Canada
- Gaël Noirot
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, NS B3H 3C3, 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, ON M3J 1P3, Canada
- Marcin Sawicki
- ORCiD
- Department of Astronomy and Physics and Institute for Computational Astrophysics, Saint Mary’s University , 923 Robie Street, Halifax, NS B3H 3C3, Canada
- Victoria Strait
- ORCiD
- Cosmic Dawn Center (DAWN) , Denmark; Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen North, Denmark
- Roberta Tripodi
- ORCiD
- University of Ljubljana , Department of Mathematics and Physics, Jadranska ulica 19, SI-1000 Ljubljana, Slovenia
- Chris Willott
- ORCiD
- NRC Herzberg , 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
- DOI
- https://doi.org/10.3847/1538-4357/adf32a
- Journal volume & issue
-
Vol. 990,
no. 1
p. 83
Abstract
We present a sample of 110 high-redshift ( z > 7.5) galaxies from the CANUCS and Technicolor surveys, showcasing photometry in every wide- and medium-band NIRCam filter in addition to ancillary Hubble Space Telescope data sampling 0.4–5 μ m (22 JWST bands out of 29 bands total). Additionally, 47 (43%) galaxies in our sample meet criteria to be classified as extreme emission line galaxies, 17 (15%) of which are completely missed by typical dropout selections due to faint ultraviolet (UV) emission. By fitting the spectral energy distributions covering the rest-frame UV to optical at z > 7.5, we investigate the dust obscuration properties, giving an unbiased view of dust buildup in high-redshift galaxies free from spectroscopic follow-up selection effects. Dust attenuation correlates with stellar mass, but more strongly with star formation rate. We find typical galaxies at z > 7.5 have ∼25% of their star formation obscured. However, since galaxies with higher star formation rates suffer more attenuation, ∼50% of the total star formation rate density at 7.5 15, implying that epoch as when dust first forms in bright galaxies.
Keywords
