Implications of a Temperature Dependent IMF I: Photometric Template Fitting

Autor:	Sneppen, Albert, Steinhardt, Charles L., Hensley, Hagan, Jermyn, Adam S., Mostafa, Basel, Weaver, John R.
Rok vydání:	2022
Předmět:	Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.3847/1538-4357/ac695e
Popis:	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. Comment: Published in the 'The Astrophysical Journal'
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2205.11536 Zobrazit plný text záznamu View this record from Arxiv