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The Kinematics of Extended Hα Emission in Blue Compact Galaxies

Published online by Cambridge University Press:  01 August 2006

T. Marquart ,
G. Östlin ,
N. Bergvall ,
P. Masegosa ,
P. Amram  and
I. Márquez
T. Marquart
Affiliation:
Uppsala Astronomical Observatory, Box 515, 75120 Uppsala, Sweden email: [email protected]
G. Östlin
Affiliation:
Stockholms Observatory, Sweden
N. Bergvall
Affiliation:
Uppsala Astronomical Observatory, Box 515, 75120 Uppsala, Sweden email: [email protected]
P. Masegosa
Affiliation:
Instituto de Astrofísica de Andalucía, Spain
P. Amram
Affiliation:
Observatoire Astronomique Marseille-Provence, France
I. Márquez
Affiliation:
Instituto de Astrofísica de Andalucía, Spain
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Abstract

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Blue Compact Galaxies (BCGs) have received interest mainly because they comprise the best available test-beds for studies of low-metallicity star formation (SF) and allow the study of relatively unevolved systems at low redshift. Their ongoing phase of intense star formation is a transient phenomenon and the best candidates for its trigger are interactions and mergers. Studies of the kinematics are important for the understanding of this process.

We present spatially resolved kinematics from the Hα line in five BCGs that show an extended region of ionised emission around the central starburst. We find this region to have near-spherical isophotes at large radii and to be dynamically decoupled from a central disturbance. A scenario where the strong triggered star formation in the center ionises the surrounding gas cloud, still following its original motions, can qualitatively explain these common features. The poster, including the figures, can be found at http://kern-2pt/thomasmarquart.net/pspdf/prague-marquart.pdf.

Keywords

galaxies: dwarfgalaxies: kinematics and dynamicsgalaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 321
Copyright
Copyright © International Astronomical Union 2007

References

Östlin, G., Amram, P., Bergvall, N., Masegosa, J., Boulesteix, J., & Márquez, I., 2001, A&A, 374, 800.Google Scholar
Veilleux, S., Shopbell, P. L., Rupke, D. S., Bland-Hawthorn, J., & Cecil, G., 2003, AJ 126, 2185.CrossRefGoogle Scholar