Gas Feedback and Angular Momentum Redistribution in Barred Galaxies within Dark Matter Halos

Details Gas Feedback and Angular Momentum Redistribution in Barred Galaxies within Dark Matter Halos Gas Feedback and Angular Momentum Redistribution in Barred Galaxies within Dark Matter Halos

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..390..382b&link_type=abstract

Pathways Through an Eclectic Universe ASP Conference Series, Vol. 390, proceedings of the conference held 23-27 April, 2007 at S

Astronomy and Astrophysics

Astronomy

Scientific paper

We have analyzed the effects of gas on the disk-halo evolution in barred galaxies using N-body/SPH simulations. Our main focus has been the angular momentum (J)~redistribution mediated by the stellar bar and the subsequent evolution of the galactic disk. We find that the stellar bars in disks with 0-8 percent gas fraction are primarily affected by the growth of a central mass concentration owing to the bar-driven gas inflow to the center. The almost abrupt weakening of the bars observed in all models is triggered either by vertical buckling (in gas-poor disks)~or by resonance heating (in gas-rich disks). The dark matter halo serves as the angular momentum sink for the stellar bar, thus compensating it for the angular momentum received from the gas.

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