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Lyman break galaxies at z>6

Published online by Cambridge University Press:  01 August 2006

Rychard J. Bouwens  and
Garth D. Illingworth
Rychard J. Bouwens
Affiliation:
UCO/Lick Observatory and Department of Astronomy, University of California Santa Cruz, Santa Cruz, California 95064, USA email: [email protected], [email protected]
Garth D. Illingworth
Affiliation:
UCO/Lick Observatory and Department of Astronomy, University of California Santa Cruz, Santa Cruz, California 95064, USA email: [email protected], [email protected]
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Abstract

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Extending the study of star-forming galaxies to z>6 is extremely difficult due to the faintness of the sources and the challenging nature of deep near-infrared observations. Nevertheless, current observations are now just good enough that we can begin drawing some conclusions about the nature of galaxies at z≳7. At present, deep near-infrared observations with NICMOS (reaching ≳27 AB mag at 5σ) cover more than 20arcmin2 of area with deep optical coverage and allow us to identify four strong z≃7–8 candidates. Comparing this sample with dropout samples at later times (z≃4–6), we are able to study evolution in the rest-frame UV LF over the range z≃8 to z≃4. We find strong evidence for significant evolution in the characteristic luminosity with time (brightening by ∼2 mag, from z≃8 to z≃4). The observed evolution appears to be the direct result of hierarchical growth in the galaxy population.

Keywords

galaxies: evolutiongalaxies: formationgalaxies: high-redshift
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Highlights of Astronomy 14: Highlights of Astronomy , August 2006 , pp. 246
Copyright
Copyright © International Astronomical Union 2007

References

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