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Algera, HSB, Inami, H, De Looze, I, Ferrara, A, Hirashita, H, Aravena, M, Bakx, T, Bouwens, R, Bowler, RAA, Da Cunha, E, Dayal, P, Fudamoto, Y, Hodge, J, Hygate, A, van Leeuwen, I, Nanayakkara, T, Palla, M, Pallottini, A, Rowland, L, Smit, R , Sommovigo, L, Stefanon, M, Vijayan, AP and van der Werf, P (2024) Accurate simultaneous constraints on the dust mass, temperature, and emissivity index of a galaxy at redshift 7.31. Monthly Notices of the Royal Astronomical Society, 533 (3). pp. 3098-3113. ISSN 0035-8711
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Accurate simultaneous constraints on the dust mass, temperature, and emissivity index of a galaxy at redshift 7.31.pdf - Published Version Available under License Creative Commons Attribution. Download (2MB) | Preview |
Abstract
We present new multifrequency Atacama Large Millimeter/submillimeter Array (ALMA) continuum observations of the massive [ log 10 ( M∗ / M ⊙) = 10 . 3 + 0 . 1 -0. 2 ], UV-luminous [ M UV = -21 . 7 ±0 . 2] z = 7 . 31 galaxy REBELS-25 in Bands 3, 4, 5, and 9. Combining the new observations with previously taken data in Bands 6 and 8, we co v er the dust continuum emission of the galaxy in six distinct bands -spanning rest-frame 50 -350 μm -enabling simultaneous constraints on its dust mass ( M dust ), temperature ( T dust ), and emissivity index ( β IR ) via modified blackbody fitting. Given a fiducial model of optically thin emission, we infer a cold dust temperature of T dust = 32 + 9 -6 K and a high dust mass of log 10 ( M dust / M ⊙) = 8 . 2 + 0 . 6 -0 . 4 , and moderately optically thick dust does not significantly alter these estimates. If we assume dust production is solely through supernovae (SNe), the inferred dust yield would be high, y = 0 . 7 + 2 . 3 -0 . 4 M _per SN. Consequently, we argue grain growth in the interstellar medium of REBELS-25 also contributes to its dust build-up. This is supported by the steep dust emissivity index βIR = 2 . 5 ±0 . 4 we measure for REBELS-25, as well as by its high stellar mass, dense interstellar medium, and metal-rich nature. Our results suggest that constraining the dust emissivity indices of high-redshift galaxies is important not only to mitigate systematic uncertainties in their dust masses and obscured star formation rates, but also to assess if dust properties evolve across cosmic time. We present an efficient observing set-up to do so with ALMA, combining observations of the peak and Rayleigh-Jeans tail of the dust emission.
| Item Type: | Article |
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| Uncontrolled Keywords: | 5109 Space Sciences; 5101 Astronomical Sciences; 51 Physical Sciences; 7 Affordable and Clean Energy; 5109 Space Sciences; 5101 Astronomical Sciences; 51 Physical Sciences; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5107 Particle and high energy physics; 5109 Space sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 25 Apr 2025 10:22 |
| Last Modified: | 25 Apr 2025 10:30 |
| DOI or ID number: | 10.1093/mnras/stae1994 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/26247 |
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