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Published May 20, 2022 | Accepted Version + Published
Journal Article Open

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

Abstract

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.

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.

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Published - Sneppen_2022_ApJ_931_57.pdf

Accepted Version - 2205.11536.pdf

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Additional details

Created:
August 22, 2023
Modified:
October 24, 2023