Environmental variation of the low-mass IMF

Autor:	Tanvir, Tabassum S, Krumholz, Mark R, Federrath, Christoph
Rok vydání:	2022
Předmět:	Astrophysics - Astrophysics of Galaxies Astrophysics - Solar and Stellar Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1093/mnras/stac2642
Popis:	We use a series of magnetohydrodynamic simulations including both radiative and protostellar outflow feedback to study the environmental variation of the initial mass function. The simulations represent a carefully-controlled experiment whereby we keep all dimensionless parameters of the flow constant except for those related to feedback. We show that radiation feedback suppresses the formation of lower mass objects more effectively as the surface density increases, but this only partially compensates for the decreasing Jeans mass in denser environments. Similarly, we find that protostellar outflows are more effective at suppressing the formation of massive stars in higher surface density environments. The combined effect of these two trends is towards an IMF with a lower characteristic mass and a narrower overall mass range in high surface density environments. We discuss the implications of these findings for the interpretation of observational evidence of IMF variation in early-type galaxies. Comment: 15 pages, 13 figures, accepted by MNRAS
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2206.04999 Zobrazit plný text záznamu View this record from Arxiv