A CENSUS OF STAR-FORMING GALAXIES AT z = 1-3 IN THE SUBARU DEEP FIELD
- Department of Physics and Astronomy, UCLA, Box 951547, Los Angeles, CA (United States)
- Department of Astronomy, School of Science, University of Tokyo, Bunkyo, Tokyo (Japan)
- Institute of Astronomy, University of Tokyo, Mitaka, Tokyo (Japan)
- Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo (Japan)
- The Hakubi Project, Kyoto University, Kyoto (Japan)
- Department of Applied Science, UC Davis, Davis, CA (United States)
Several UV and near-infrared color selection methods have identified galaxies at z = 1-3. Since each method suffers from selection biases, we have simultaneously applied three leading techniques (Lyman break, BX/BM, and BzK selection) in the Subaru Deep Field. This field has reliable ({Delta}z/(1 + z) = 0.02-0.09) photometric redshifts for {approx}53,000 galaxies from 20 bands (1500 A-2.2 {mu}m). The BzK, LBG, and BX/BM samples suffer contamination from z < 1 interlopers of 6%, 8%, and 20%, respectively. Around the redshifts where it is most sensitive (z {approx} 1.9 for star-forming BzK, z {approx} 1.8 for z {approx} 2 LBGs, z {approx} 1.6 for BM, and z {approx} 2.3 for BX), each technique finds 60%-80% of the census of the three methods. In addition, each of the color techniques shares 75%-96% of its galaxies with another method, which is consistent with previous studies that adopt identical criteria on magnitudes and colors. Combining the three samples gives a comprehensive census that includes {approx}90% of z{sub phot} = 1-3 galaxies, using standard magnitude limits similar to previous studies. In fact, we find that among z = 1-2.5 galaxies in the color selection census, 81%-90% of them can be selected by just combining the BzK selection with one of the UV techniques (z {approx} 2 LBG or BX and BM). The average galaxy stellar mass, reddening, and star formation rates (SFRs) all decrease systematically from the sBzK population to the LBGs, and to the BX/BMs. The combined color selections yield a total cosmic SFR density of 0.18 {+-} 0.03 M{sub sun} yr{sup -1} Mpc{sup -3} for K{sub AB} {approx}< 24. We find that 65% of the star formation is in galaxies with E(B - V) > 0.25 mag, even though they are only one-fourth of the census by number.
- OSTI ID:
- 21578405
- Journal Information:
- Astrophysical Journal, Vol. 735, Issue 2; Other Information: DOI: 10.1088/0004-637X/735/2/91; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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