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Implications of a Temperature-dependent Initial Mass Function. II. An Updated View of the Star-forming Main Sequence

Steinhardt, Charles L. and Sneppen, Albert and Mostafa, Basel and Hensley, Hagan and Jermyn, Adam S. and Lopez, Adrian and Weaver, John and Brammer, Gabriel and Clark, Thomas H. and Davidzon, Iary and Diaconu, Andrei C. and Mobasher, Bahram and Rusakov, Vadim and Toft, Sune (2022) Implications of a Temperature-dependent Initial Mass Function. II. An Updated View of the Star-forming Main Sequence. Astrophysical Journal, 931 (1). Art. No. 58. ISSN 0004-637X. doi:10.3847/1538-4357/ac62d6.

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The stellar initial mass function (IMF) is predicted to depend upon the temperature of gas in star-forming molecular clouds. The introduction of an additional parameter, TIMF, into photometric template fitting, allows galaxies to be fit with a range of IMFs. Three surprising new features appear: (1) most star-forming galaxies are best fit with a bottom-lighter IMF than the Milky Way; (2) most star-forming galaxies at fixed redshift are fit with a very similar IMF; and (3) the most-massive star-forming galaxies at fixed redshift instead exhibit a less bottom-light IMF, similar to that measured in quiescent galaxies. Additionally, since stellar masses and star formation rates both depend on the IMF, these results slightly modify the resulting relationship, while yielding similar qualitative characteristics to previous studies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Steinhardt, Charles L.0000-0003-3780-6801
Sneppen, Albert0000-0002-5460-6126
Jermyn, Adam S.0000-0001-5048-9973
Weaver, John0000-0003-1614-196X
Brammer, Gabriel0000-0003-2680-005X
Clark, Thomas H.0000-0003-3873-968X
Davidzon, Iary0000-0002-2951-7519
Diaconu, Andrei C.0000-0002-6459-8772
Rusakov, Vadim0000-0001-7633-3985
Toft, Sune0000-0003-3631-7176
Alternate Title:Implications of a Temperature Dependent IMF II: An Updated View of the Star-Forming Main Sequence
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 11; accepted 2022 March 28; published 2022 May 25. The authors would like to thank Vasily Kokorev and Darach Watson for useful discussions. C.L.S. is supported by ERC grant 648179 "ConTExt." B.M. is supported by the Tombrello Fellowship. A.L. is supported by the Selove Prize. 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
Tombrello FellowshipUNSPECIFIED
Danish National Research Foundation140
Simons FoundationUNSPECIFIED
Subject Keywords:Star formation; Star forming regions; Initial mass function; Galaxy quenching; Galaxy evolution
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Star formation (1569); Star forming regions (1565); Initial mass function (796); Galaxy quenching (2040); Galaxy evolution (594)
Record Number:CaltechAUTHORS:20220629-450215700
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Official Citation:Charles L. Steinhardt et al 2022 ApJ 931 58
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115294
Deposited By: Tony Diaz
Deposited On:30 Jun 2022 16:09
Last Modified:30 Jun 2022 16:09

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