Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3902g&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #39.02; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from a FUSE survey of local starburst galaxies. We combine ongoing observations from the FUSE Starburst Legacy Project with archival observations to create the largest sample to date ( 50) of far-ultraviolet (FUV) galaxy spectra.
In contrast to the local universe where observations of galaxies in the FUV are limited by atmospheric absorption, relatively large samples of star forming galaxies have been observed at high redshifts. Rest wavelength FUV observations of Lyman break galaxies (LBGs) provide important insights into galaxy formation and evolution. The FUV wavelength regime is rich in absorption features that probe the characteristics of galactic outflows, the inter-stellar medium (ISM), and stellar content. FUV observations can help constrain outflow velocities, energetics, and the chemical composition of galactic outflows.
Outflows from LBGs also play a role in reionizing the universe and enriching the IGM. Our sample provides an important benchmark to compare LBGs to our local galaxy population. The proximity of our galaxies also allows us to assemble a complimentary multiwavelength (e.g. X-ray) data set that is not possible at high redshifts.
Preliminary results from our study include evidence that the outflow speeds of neutral and low ionization lines increase with the star formation rate (SFR). The OVI absorption line is also significantly broader and more blueshifted than the lower ionization lines. This is consistent with OVI production at the interface between the hot outrushing gas and the cooler ions. These results show that our study provides a unique view of starburst galaxies that will play an important role in constraining galaxy formation and evolution.
Aloisi Alessandra
Grimes John P.
Heckman Tim
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