Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536501v&link_type=abstract
American Astronomical Society, AAS Meeting #215, #365.01; Bulletin of the American Astronomical Society, Vol. 42, p.553
Astronomy and Astrophysics
Astronomy
Scientific paper
Luminous Infrared Galaxies (LIRGs) play an important role in the star formation history of the Universe. Local LIRGs are undergoing intense bursts of star formation, and in most cases they involve tidal interactions and major mergers between massive disk galaxies.
One of the primary components of the Great Observatories All-sky LIRG Survey (GOALS) are high-resolution images in F435W and F814W filters acquired for 88 LIRGs with LIR > 1011.4 Lsun using the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS). These observations provide a unique opportunity to study the largest data set currently available for optically-visible super star clusters (SSCs) in merging galaxies.
In this talk, I will begin by presenting highlights from a study of over 6000 SSCs detected in the 12 most cluster-rich systems in the GOALS sample; each LIRG in this subset contains more than 200 SSCs detected at optical wavelengths. The analysis includes luminosity functions, B-I colors, and constraining of the cluster ages by fitting with Bruzual-Charlot stellar population models.
The spatial distribution of these optical clusters is then compared with that of star formation as traced by PAH (Spitzer) and far-UV (GALEX) emission to determine whether the SSCs are essentially the unobscured portion of the much more energetic starburst, or are decoupled from the infrared-producing burst. The analysis is then extended to the complete sample of 88 LIR > 1011.4 Lsun LIRGs.
Armus Lee
Evans Aaron
GOALS Team
Howell John
Kim Dongseok
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