Looking for the first galaxies: Lensing or blank fields?

Details Looking for the first galaxies: Lensing or blank fields? Looking for the first galaxies: Lensing or blank fields?

2009-10-26

arxiv.org/abs/0910.4910v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17 pages, 13 figures, accepted for publication in A&A

Scientific paper

The identification and study of the first galaxies remains one of the most exciting topics in observational cosmology. The determination of the best possible observing strategies is a very important choice in order to build up a representative sample of spectroscopically confirmed sources at high-z (z>7), beyond the limits of present-day observations. This paper is intended to precisely adress the relative efficiency of lensing and blank fields in the identification and study of galaxies at 6~7. Also in this case, the number of z>8 sources expected at the typical depth of JWST (AB~28-29) is much higher in lensing than in blank fields (e.g. a factor of ~10 for AB<~28). Blank field surveys with a large field of view are needed to prove the bright end of the LF at z>6-7, whereas lensing clusters are particularly useful for exploring the mid to faint end of the LF.

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