Environmental variation of the low-mass IMF

Author:

Tanvir Tabassum S1,Krumholz Mark R12ORCID,Federrath Christoph12

Affiliation:

1. Research School of Astronomy and Astrophysics, Australian National University , Canberra, ACT 2611, Australia

2. Australian Research Council Centre of Excellence in All Sky Astrophysics (ASTRO3D) , Canberra, ACT 2611, Australia

Abstract

ABSTRACT We use a series of magnetohydrodynamic simulations including both radiative and protostellar outflow feedback to study environmental variation of the initial mass function (IMF). 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 for these findings for the interpretation of observational evidence of IMF variation in early type galaxies.

Funder

Australian Research Council

National Computational Infrastructure

NCI

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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1. The Interplay between the Initial Mass Function and Star Formation Efficiency through Radiative Feedback at High Stellar Surface Densities;The Astrophysical Journal Letters;2024-05-22

2. Consequences of a low-mass high-pressure star formation mode in early galaxies;Monthly Notices of the Royal Astronomical Society;2024-05-06

3. The universal variability of the stellar initial mass function probed by the TIMER survey;Astronomy & Astrophysics;2024-04

4. The metallicity dependence of the stellar initial mass function;Monthly Notices of the Royal Astronomical Society;2023-11-21

5. Can massive stars form in low mass clouds?;Monthly Notices of the Royal Astronomical Society;2023-09-07

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