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Gas accretion from the cosmic web in the local Universe

Published online by Cambridge University Press:  12 October 2016

J. Sánchez Almeida ,
B. G. Elmegreen ,
C. Muñoz-Tuñnón  and
D. M. Elmegreen
J. Sánchez Almeida
Affiliation:
Instituto de Astrofí sica de Canarias, E-38205 La Laguna, Tenerife, Spain email: [email protected], [email protected] Departamento de Astrofsica, Universidad de La Laguna, Tenerife, Spain
B. G. Elmegreen
Affiliation:
IBM Research Division, T.J. Watson Research Center, Yorktown Heights, NY 10598, USA email: [email protected]
C. Muñoz-Tuñnón
Affiliation:
Instituto de Astrofí sica de Canarias, E-38205 La Laguna, Tenerife, Spain email: [email protected], [email protected] Departamento de Astrofsica, Universidad de La Laguna, Tenerife, Spain
D. M. Elmegreen
Affiliation:
Department of Physics and Astronomy, Vassar College, Poughkeepsie, NY 12604, USA email: [email protected]
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Abstract

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Numerical simulations predict that gas accretion from the cosmic web drives star formation in disks galaxies. The process is important in low mass haloes (< 1012 M⊙), therefore, in the early universe when galaxies were low mass, but also in dwarf galaxies of the local universe. The gas that falls in is predicted to be tenuous, patchy, partly ionized, multi-temperature, and large-scale; therefore, hard to show in a single observation. One of the most compelling cases for gas accretion at work in the local universe comes from the extremely metal poor (XMP) galaxies. They show metallicity inhomogeneities associated with star-forming regions, so that large starbursts have lower metallicity than the underlying galaxy. Here we put forward the case for gas accretion from the web posed by XMP galaxies. Two other observational results are discussed too, namely, the fact that the gas consumption time-scale is shorter than most stellar ages, and the systematic morphological distortions of the HI around galaxies.

Keywords

Galaxies: evolutionGalaxies: formationGalaxies: generalGalaxies: high-redshiftGalaxies: star formationlarge-scale structure of Universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 390 - 393
Copyright
Copyright © International Astronomical Union 2016 

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