Stellar Initial Mass Function over a range of redshifts
arXiv:2010.07692 · doi:10.1002/asna.202113897
Abstract
The stellar Initial Mass Function (IMF) seems to be close to universal in the local star-forming regions. However, this quantity of a newborn stellar population responds differently at gas metallicities than = 0. A view on the cosmic star formation history suggests that the cooling agents in the gas vary both in their types and molecular abundances. For instance, in the primordial gas environment, the gas temperature can be higher by a factor of 30 as compared to the present day. Stellar radiation feedback and cosmic microwave background (CMB) radiation may even contribute towards increasing the floor temperature of the star-forming gas which subsequently can leave profound impacts on the IMF. We present the contribution of the radiation sources towards the thermodynamical evolution of the Jeans unstable gas cloud which experiences fragmentation and mass accretion. We find evidence which suggests that the latter becomes the dominant process for star formation efficiencies (SFE) above 5 - 7 %, thus increasing the average mass of the stars. We focus on the isolated and binary stellar configurations emerging during the gas collapse. The binary fraction on average remains 0.476 and contributes significantly towards the total SFE of 15 %.
arXiv commentAccepted for publication in Astronomische Nachrichten. 6 pages, 5 figures, and 1 table. arXiv admin note: text overlap with arXiv:2003.07639
References in corpus (23)
- Galactic Stellar and Substellar Initial Mass Function
- On the variation of the Initial Mass Function
- A Universal Stellar Initial Mass Function? A Critical Look at Variations
- SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
- Rapid Formation of Molecular Clouds and Stars in the Solar Neighborhood
- Thermal and Fragmentation Properties of Star-forming Clouds in Low-metallicity Environments
- A Catalog of Multiplicity among Bright Stellar Systems
- The initial mass function : from Salpeter 1955 to 2005
- Fragmentation of star-forming clouds enriched with the first dust
- Constraining the Statistics of Population III Binaries
- Star formation in metal-poor gas clouds
- Is molecular gas necessary for star formation?
- Presupernova evolution and explosive nucleosynthesis of zero metal massive stars
- Simulations of the star-forming molecular gas in an interacting M51-like galaxy
- Metals, dust and the cosmic microwave background: fragmentation of high-redshift star-forming clouds
- On the First Generation of Stars
- Roll of the Dice: A Stochastically Sampled IMF Alters the Stellar Content of Simulated Dwarf Galaxies
- Binaries in star clusters and the origin of the field stellar population
- A detailed framework to incorporate dust in hydrodynamical simulations
- Consequences of cosmic microwave background-regulated star formation
- Do fragmentation and accretion affect the stellar Initial Mass Function?
- Thermal Regulation and the Star-Forming Main Sequence
- The systematically varying stellar IMF