Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008chjaa...8....1k&link_type=abstract
Chinese Journal of Astronomy and Astrophysics, Volume 8, Issue 1, pp. 1-11 (2008).
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
Using a simple color selection based on B-, z- and K-band photometry, BzK = (z-K)AB-(B-z)AB>-0.2, we picked out 52 star-forming galaxies at 1.4lsimzlsim2.5 (sBzKs) from a K-band selected sample (KVega<22.0) in an area of ~5.5 arcmin2 of the Hubble Ultra Deep Field (UDF). We develop a new photometric redshift method, and the error in our photometric redshifts is less than 0.02(1+z). From the photometric redshift distribution, we find the BzK color criterion can be used to select star-forming galaxies at 1.4lsimzlsim2.5 with KVega<22.0. Down to KVega<22.0, the number counts of sBzKs increase linearly with the K magnitude; the sBzKs are strongly clustered, and most of them have irregular morphologies on the ACS images. They have a median reddening of E(B-V)~0.28, an average star formation rate of ~36 Modot yr-1 and a typical stellar mass of ~1010Modot. The UV criterion for the galaxies at z~2 can select most of the faint sBzKs in the UDF, but it does not work well for bright, massive, highly-reddened, actively star-forming galaxies.
Kong Xu
Wang Min
Zhang Wanchuan
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