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Gas accretion from the cosmic web feeding disk galaxies

Published online by Cambridge University Press:  21 March 2017

J. Sánchez Almeida ,
A. Olmo-García ,
B. G. Elmegreen ,
C. Muñoz-Tuñón ,
D. M. Elmegreen ,
M. E. Filho ,
E. Pérez-Montero  and
R. Amorín
J. Sánchez Almeida
Affiliation:
Instituto Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, Spain
A. Olmo-García
Affiliation:
Instituto Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, Spain
B. G. Elmegreen
Affiliation:
IBM Research Division, T.J. Watson Research Center, Yorktown Heights, NY 10598, USA
C. Muñoz-Tuñón
Affiliation:
Instituto Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, Spain
D. M. Elmegreen
Affiliation:
Department of Physics and Astronomy, Vassar College, Poughkeepsie, NY 12604, USA
M. E. Filho
Affiliation:
Instituto Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, Spain SIM/CENTRA, Lisbon, Portugal Centro de Astrofísica da Universidade do Porto, Porto, Portugal Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, Lisboa, Portugal
E. Pérez-Montero
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain
R. Amorín
Affiliation:
INAF-Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy
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Abstract

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Disk galaxies in cosmological numerical simulations grow by accreting gas from the cosmic web. This gas reaches the external disk, and then spirals in dragged along by tidal forces and/or disk instabilities. The importance of gas infall is as clear from numerical simulations as it is obscure to observations. Extremely metal poor (XMP) galaxies seem to be the best example we have of the gas accretion process at work. They have large off-center starbursts which show significant metallicity drop compared with the host galaxy. This observation is naturally explained as a gas accretion event caught in the act. We present preliminary results of the kinematical properties of the metal poor starbursts in XMPs, which suggest that the starbursts are kinematically decoupled entities within the host galaxy.

Keywords

galaxies: abundancesgalaxies: formationintergalactic mediumgalaxies: irregulargalaxies: kinematics and dynamicsgalaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 208 - 210
Copyright
Copyright © International Astronomical Union 2017 

References

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