Gas accretion from the cosmic web feeding disk galaxies

Bibcode
2017IAUS..321..208S
DOI
10.1017/S1743921316008863
Sánchez Almeida, J.; Olmo-García, A.; Elmegreen, B. G.; Muñoz-Tuñón, C.; Elmegreen, D. M.; Filho, M. E.; Pérez-Montero, E.; Amorín, R.
Bibliographical reference

Formation and Evolution of Galaxy Outskirts, Proceedings of the International Astronomical Union, IAU Symposium, Volume 321, pp. 208-210

Advertised on:
3
2017
Number of authors
8
IAC number of authors
4
Citations
0
Refereed citations
0
Description
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.
Type
Non-refereed
Galaxies
Intergalactic medium

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