Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535003b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #350.03; Bulletin of the American Astronomical Society, Vol. 42, p.532
Astronomy and Astrophysics
Astronomy
Scientific paper
We use the ultra-deep WFC3/IR data over the HUDF and the Early Release Science WFC3/IR data over the CDF-South GOODS field to quantify the broadband spectral properties of star-forming galaxies at z 7-8. We determine the UV-continuum slopes (beta) in these galaxies, and compare the slopes with galaxies at later times to measure the evolution. For luminous L* galaxies, we measure a mean UV-continuum slope beta of -2.0+/-0.2, which is comparable to that derived at similar luminosities at z 5-6. However, for the lower luminosity 0.1L* galaxies, we measure a mean beta of -3.0. This is substantially bluer than is found for similar luminosity galaxies at z 4, just 800 Myr later, and even at z 5-6. In this presentation, we discuss the possible interpretations of these very blue UV-continuum slopes. We also discuss similarities with z 8 galaxy selections -- where the slopes appear equally blue.
Bouwens Rychard
Illingworth Garth
Oesch Pascal
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