Computer Science – Databases
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop50189s&link_type=abstract
Spitzer Proposal ID #50189
Computer Science
Databases
Scientific paper
Lyman break galaxies (LBGs) at high redshifts (z>5) probe the earliest stages of massive galaxy formation, exploring a low-metallicity/low-mass regime seldom seen in today's universe. In order to overcome the difficulty of studying the most distant objects, we have identified a rare set of local galaxies with rest-frame ultraviolet-optical properties similar to those of z>5 LBGs from the joint GALEX-SDSS databases. We propose to extend our study of these galaxies into the infrared, studying their stellar, dust and gas content, and for the first time obtaining a true estimate of the specific star formation density in this mode of star formation. In particular, these observations should help answer several key unknowns about the highest redshift LBGs. With IRS spectroscopy we will determine whether the molecular gas is too heated to continue star formation for an extended period, explaining the short-lived and stochastic star formations seen at z=5. Photoionization analysis of ratios of high ionization potential forbidden lines available in combination with the strong, narrow optical emission lines will determine the hardness of the ionising spectrum. Finally, a full UV-Far-IR SED employing data from GALEX, SDSS, IRAC and MIPS will allow us to relate these intense starbursts to other known starbursts, in particular the amount of dust emission per unit mass and quantity of obscured star formation in these systems.
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