Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532904p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #329.04; Bulletin of the American Astronomical Society, Vol. 42, p.427
Astronomy and Astrophysics
Astronomy
Scientific paper
Luminous compact blue galaxies (LCBGs) are a diverse class of galaxies characterized by high luminosities, blue colors, and high surface brightness. While they were relatively common at a redshift of one, and contribute a significant fraction to the star formation rate density at the time, today they are a factor of ten rarer and contribute negligibly to the star formation rate density. As such, they are one of the most rapidly evolving populations of galaxies in the Universe. Given their location at the high luminosity, high mass tip of the blue sequence, LCBGs sit at the critical juncture of galaxies that are evolving from the blue to the red sequence.
As part of our multi-wavelength survey of the local LCBGs, we have been using the VLA and GMRT to map a sample of LCBGs in HI 21 cm emission to study their kinematics. Our goal is to determine if single-dish HI observations represent a true measure of the dynamical mass of LCBGs and to look for signatures of recent interactions that may be triggering LCBGs. Our data show that while some LCBGs are in an ongoing interaction, many appear isolated. While all LCBGs contain HI and show signatures of rotation, the population does not lie on the Tully-Fisher relation nor can it evolve onto it. Furthermore, the HI maps of many LCBGs show signatures of dynamically hot components, suggesting that we are seeing the formation of a thick disk or spheroid in at least some LCBGs. There is good agreement between the HI and Hα kinematics for LCBGs, and both are similar in appearance to the Hα kinematics of high redshift star-forming galaxies. Our combined data suggest that star formation in LCBGs is primarily quenched by virial heating, consistent with model predictions.
Garland Catherine
Guzman Rafael
Perez-Gallego J.
Pisano Daniel J.
Rabidoux Katherine
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