Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940604r&link_type=abstract
American Astronomical Society, AAS Meeting #219, #406.04
Astronomy and Astrophysics
Astronomy
Scientific paper
Most of the star-forming galaxies at high redshifts, when observed at restframe UV wavelengths are found to contain kiloparsec-sized clumps, with stellar masses 109 M&sun; on average. These star-forming clumps having masses and sizes that are orders of magnitude larger than the starbursts observed at low redshifts, are a unique feature at z>1. In hydrodynamical simulations, the "clump phase" is a natural consequence of rapid gas accretion, large gas fraction, and large turbulence in the disk galaxies at early cosmic epochs. The near-infrared images from GOODS-ERS, HUDF, and CANDELS allows to examine the restframe optical properties of the clumps in unprecedented detail, and to obtain important constraints on their masses, star formation rates, color, M/L, and stellar ages. In this talk, I will present the recent results based on the observed restframe UV-optical properties of clumps, and discuss their implications in the context of current theories on clump formation and evolution.
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