The role of the Cosmic Microwave Background in high-z star formation

R. Schneider, Kazuyuki Omukai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The origin of the stellar Initial Mass Function (IMF) and its variation with cosmic time or with diverse environmental conditions still lack a complete physical interpretation. Observation- ally, the present-day stellar IMF appears to have an almost universal profile, characterized by a power-law at large masses and flattening below a characteristic mass of ∼ 1M⊙. Among the many proposed explanations, the origin of the characteristic stellar mass and the broad peak of the IMF are best attributed to gravitational fragmentation, which sets the mean Jeans mass at cloud fragmentation. We present the results of a self-consistent study of the response of the mean Jeans mass at cloud fragmentation to metal line-cooling, dust-cooling and the Cosmic Microwave Background (CMB) based on a semi-analytic model of the thermal evolution of clouds with varying initial metal- licities and dust contents at different redshifts. We then discuss the implications of our findings for observational samples of very metal poor stars observed in the halo of our Galaxy.

Original languageEnglish
Title of host publicationTours Symposium on Nuclear Physics and Astrophysics - VII
Pages117-121
Number of pages5
DOIs
Publication statusPublished - 2010 Jul 20
Externally publishedYes
Event7th Tours Symposium on Nuclear Physics and Astrophysics - Kobe, Japan
Duration: 2009 Nov 162009 Nov 20

Publication series

NameAIP Conference Proceedings
Volume1238
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other7th Tours Symposium on Nuclear Physics and Astrophysics
CountryJapan
CityKobe
Period09/11/1609/11/20

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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