Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732503m&link_type=abstract
American Astronomical Society, AAS Meeting #217, #325.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astrophysics
Scientific paper
Recent studies using Keck and VLT integral field units (IFU) have unveiled the spatially-resolved detailed kinematics of star-forming monsters at z 2-3, close to the peak in star-formation rate density. Optically-selected galaxies have been the principal targets of these studies. Although disagreement concerning whether systemic rotation or turbulent motions dominate the internal dynamics of these objects, authors agree in their findings of high velocity dispersions, up to ten times the velocity dispersions in the local Universe ( 10 km/s). It remains an open question whether these findings are representative of "normal" galaxies at high redshift. Current instrument sensitivities limit our exploration of the high-redshift universe to the most extreme, massive and luminous cases. Although stacking analysis allow us to probe for the less-luminous galaxy populations, a myriad of open questions remain on the astrophysical details of the galaxy "garden-variety" at these high redshifts.
More recently, a sample of super-compact UV-luminous galaxies unveiled by the Galaxy Evolution Explorer (GALEX) has been shown to be an excellent local analog at z 0.2 for the high-redshift Lyman-Break Galaxy population. We have undertaken the study of a sample of compact UV-luminous galaxies at z 0.2, which are complementary to these Lyman-break local analogs in the interest of exploring the similarities (or perhaps differences) of the less-massive, yet strongly starbursting systems that high-redshift studies are unable to probe. We have targeted a sample of 10 compact UVLGs with Magellan/IMACS using the Integral Field Unit mode, which gives us access to the full rest-frame optical line emission of these z 0.2 objects. Through a simultaneous spatial and spectral insight we seek to obtain unparalleled insight to the distribution of dust (as given by the distribution of the observed Balmer decrement), metallicity and internal kinematics of these objects.
Bai Lianfa
Goncalves Thiago S.
Law David R.
Ludlum K.
Menéndez-Delmestre Karín
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