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Implications of a Temperature-dependent Initial Mass Function. I. Photometric Template Fitting

Sneppen, Albert and Steinhardt, Charles L. and Hensley, Hagan and Jermyn, Adam S. and Mostafa, Basel and Weaver, John R. (2022) Implications of a Temperature-dependent Initial Mass Function. I. Photometric Template Fitting. Astrophysical Journal, 931 (1). Art. No. 57. ISSN 0004-637X. doi:10.3847/1538-4357/ac695e.

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A universal stellar initial mass function (IMF) should not be expected from theoretical models of star formation, but little conclusive observational evidence for a variable IMF has been uncovered. In this paper, a parameterization of the IMF is introduced into photometric template fitting of the COSMOS2015 catalog. The resulting best-fit templates suggest systematic variations in the IMF, with most galaxies exhibiting top-heavier stellar populations than in the Milky Way. At fixed redshift, only a small range of IMFs are found, with the typical IMF becoming progressively top-heavier with increasing redshift. Additionally, subpopulations of ULIRGs, quiescent and star-forming galaxies are compared with predictions of stellar population feedback and show clear qualitative similarities to the evolution of dust temperatures.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Sneppen, Albert0000-0002-5460-6126
Steinhardt, Charles L.0000-0003-3780-6801
Jermyn, Adam S.0000-0001-5048-9973
Weaver, John R.0000-0003-1614-196X
Alternate Title:Implications of a Temperature Dependent IMF I: Photometric Template Fitting
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 September 21; revised 2022 March 9; accepted 2022 March 12; published 2022 May 25. The authors would like to thank Gabe Brammer, Tommy Clark, Andrei Diaconu, Vasily Kokorev, Vadim Rusakov, Sune Toft, and Darach Watson for helpful comments. C.L.S. is supported by ERC grant 648179 "ConTExt." The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant No. 140. The Flatiron Institute is supported by the Simons Foundation.
Funding AgencyGrant Number
European Research Council (ERC)648179
Danish National Research Foundation140
Simons FoundationUNSPECIFIED
Subject Keywords:Galaxy evolution; Initial mass function; Stellar mass functions
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Galaxy evolution (594); Initial mass function (796); Stellar mass functions (1612)
Record Number:CaltechAUTHORS:20220608-849345000
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Official Citation:Albert Sneppen et al 2022 ApJ 931 57
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115078
Deposited By: George Porter
Deposited On:14 Jun 2022 16:14
Last Modified:14 Jun 2022 16:14

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