Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dms..conf..151s&link_type=abstract
DEEP MILLIMETER SURVEYS Implications for Galaxy Formation and Evolution. Held 19-21 June 2000 in University of Massachusetts, Am
Astronomy and Astrophysics
Astronomy
Scientific paper
Based on the properties of local ULIRGS, studies of high redshift galaxies undergoing starbursts will require better than arcsec resolution. Critical constraints such as the gas mass fraction (which might indicate the youth of the galaxies) and the existence of multiple nuclei (indicative of heirarchical merging) require both kinematic and spatially resolved imaging. In the luminous infrared galaxies, nuclear starbursts and active nuclei are fueled by extraordinarily large masses of gas and dust concentrated at radii of a few hundred pc by viscous accretion and the torques associated with galactic merging. The nearby ULIRGS are probably excellent analogs of galaxies seen at high redshift during the epoch of galaxy formation and growth. We summarize results from a NICMOS survey of 24 ultra-luminous IR galaxies together with mm-interferometry of the molecular gas in these galaxies. Eight of the 24 galaxies imaged with NICMOS have nuclear point sources and eleven have double nuclei. Nine of the 24 systems are fit better by an r1/4 law (rather than an exponential disk), suggesting that the young starburst population can relax rapidly in violent mergers. In the IR galaxies much of the enhancement in the star formation probably occurs via the collision of massive clouds since, often, large numbers of bright clusters may be found in the overlap regions of the colliding galaxies. The high resolution NICMOS and mm-wave interferometric imaging of the local ULIRG prototype, Arp 220 indicate double nuclei separated by ~ 350 pc, each of which is embedded in a massive gas and dust disk with typical column densities corrresponding to AV ~ 1000 mag. Studying such systems at high redshift clearly requires mm/submm observations.
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