Star formation in UV-bright interacting galaxies
Nelson, Charles H.
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Galaxy interactions are known to drive interstellar gas toward the nuclear regions, thus triggering bursts of star formation. To investigate the relationship between galaxy interactions and the induced star formation, we obtained from the 40-inch telescope at Mt. Laguna U, B, V, and R images of NGC3395 & NGC3396 (an interacting pair) and NGC3991, NGC3994, & NGC3995 (an interacting trio), all of which exhibit strong UV emission known to be a signature of vigorous star formation. By comparing our multi-color data with star formation models, we can determine the age and strength of each star-forming region, and thus characterize the star-formation history of each object. One possibility is that interactions produce a “chain reaction” – one burst triggering another burst and so on – which should be discernible from the distribution of ages across the galaxy. We compare results from the NCG3991/4/5 trio with results from the NGC3395/6 pair.
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Hulsebus, Alan; Nelson, Charles H.; Ragan, Sarah; McGleam, Catherine (2005-06-23)The interacting pair NGC3395 and NGC3396 and the interacting trio and NGC3991, NGC3994, and NGC3995 emit strongly in the ultraviolet, indicating multiple regions of active star formation. To investigate the nature of the ...
Bennett, Wendy; Madland, Mark; Weinzirl, Timothy; Nelson, Charles H. (2007-06-01)Recent searches for massive black holes in galactic nuclei show that they are common if not ubiquitous. Furthermore, there are important relationships between black hole mass and properties characterizing the size and ...
Weinzirl, Timothy; Bennett, Wendy; Madland, Mark (2007-05-29)Seyfert galaxies, in which accretion onto a massive nuclear black hole acts as a powerful energy source, allegedly have bulges more luminous per unit mass than those in normal galaxies. We have tested this claim through ...