Constraining the IMF with the Cosmic Spectral Energy Distribution

Details Constraining the IMF with the Cosmic Spectral Energy Distribution Constraining the IMF with the Cosmic Spectral Energy Distribution

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..440..377w&link_type=abstract

UP2010: Have Observations Revealed a Variable Upper End of the Initial Mass Function? ASP Conference Proceedings, Vol. 440. Pro

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the observed local Cosmic Spectral Energy Distribution (CSED) and Cosmic Star Formation History (CSFH) we constrain the high-mass slope of the stellar Initial Mass Function (IMF). We find that, together, the CSED and CSFH suggest that very steep high-mass slopes: α2>2.45 (c.f. Salpeter α2=2.35) are strongly disfavoured and that a slightly-shallower than Salpeter high-mass slope α2=2.2 produces the greatest correspondence. However, these conclusions are dependent on the accuracy of population synthesis models and the assumption of the fiducial ΛCDM cosmology.

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