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The contribution of starbursts and normal galaxies to IR luminosity functions and the molecular gas content of the Universe at z<2

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posted on 2023-06-08, 17:22 authored by Mark Sargent, E Daddi, M Béthermin, D Elbaz
We present a parameter-less approach capable of predicting the shape of the infrared luminosity function at redshifts z =2. It relies on three observables: (1) the redshift evolution of the stellar mass function for star-forming galaxies, (2) the evolution of the specific star formation rate of main-sequence galaxies, and (3) the double-Gaussian decomposition of the specific star formation rate distribution at fixed stellar mass into the contributions (assumed to be redshift- and mass-invariant) from main-sequence and starburst activity. Using this self-consistent and simple framework, we identify the contributions of main-sequence and starburst activity to the global infrared luminosity function and find a constant or only weakly redshift-dependent contribution (8–14%) of starbursts to the star formation rate density at z =2. Over the same redshift range, we also infer the evolution of the cosmic abundance of molecular gas in star-forming galaxies, based on the relations between star formation rate and molecular gas mass followed by normal and starburst galaxies.

History

Publication status

  • Published

File Version

  • Published version

Journal

Asociacion Argentina de Astronomia La Plata Argentina Book Series

Publisher

Argentine Astronomical Society

Volume

4

Page range

116

Book title

Proceedings of the Second Workshop on Numerical and Observational Astrophysics: From the First Structures to the Universe Today

Series

A.A.A. Book Series of the Argentine Astronomical Society

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2014-05-21

First Open Access (FOA) Date

2018-01-25

First Compliant Deposit (FCD) Date

2016-03-22

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