Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21711405r&link_type=abstract
American Astronomical Society, AAS Meeting #217, #114.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Ultraluminous/Luminous Infrared Galaxies (U/LIRGs) are an excellent laboratory for investigating galaxy formation and evolution. They are complex systems, running the gamut of galaxy nuclear types and covering a sequence of massive mergers from isolated starburst galaxies to completely coalesced mergers with post-starburst populations and strong AGN. The detailed relationship between star formation, AGN, the ISM environment, gas motions, and merger evolution in LIRGs remains poorly understood.
This talk presents the first results from a survey of nearby U/LIRGs from the GOALS sample. Our data come from WiFeS, a new IFU on the ANU 2.3m at Siding Spring Observatory. WiFeS has proved well suited for observing nearby U/LIRGs given its wide 25"x38" field of view, moderate R 7000 resolution and broad wavelength coverage (370-700 nm).
We investigate galactic winds, extended emission power sources, metallicity distributions and stellar populations in our sample of U/LIRGs, many of which are merging systems.
Our early results indicate extended LINER emission driven by slow shocks in some of our observed systems, which could have important implications for similar composite and LINER sources. We provide new slow shock models which provide an excellent fit to the observed line ratios.
I will also discuss the observations of the least IR luminous galaxy in our sample, NGC 839, which seems to be a precursor E+A galaxy.
Our work has shown that IFU data is incredibly useful for understanding key features of U/LIRGs and disentangling the composite nature of these complex systems.
Dopita Mike
Kewley Lisa
Rich Jeffrey
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