A Statistical Study of Circumnuclear Morphology of Sigma-Drop Galaxies

Details A Statistical Study of Circumnuclear Morphology of Sigma-Drop Galaxies A Statistical Study of Circumnuclear Morphology of Sigma-Drop Galaxies

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..390..174c&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

Sigma-drop galaxies are characterized by a drop in the stellar velocity dispersion in their centers. One of the most likely theories to explain this phenomenon is that there is a young stellar population that has recently formed, and that has inherited the kinematics of the gas. We compare the morphology of the dust and the Hα emission in 20 σ-drop galaxies and in a matched control sample. We also study the total emission in CO and in HI in order to investigate any correlation between the occurrence of σ-drops and the amount of gas. We have found more circumnuclear spiral arms as outlined in dust, and more star formation in nuclear rings in the sigma-drop galaxies. That indicates that sigma-drops are probably related to starbursts, driven by gas inflows.

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