TY - JOUR
T1 - THE UV luminosity function of star-forming galaxies via dropout selection at redshifts z ∼ 7 and 8 from the 2012 ultra deep field campaign
AU - Schenker, Matthew A.
AU - Robertson, Brant E.
AU - Ellis, Richard S.
AU - Ono, Yoshiaki
AU - McLure, Ross J.
AU - Dunlop, James S.
AU - Koekemoer, Anton
AU - Bowler, Rebecca A.A.
AU - Ouchi, Masami
AU - Curtis-Lake, Emma
AU - Rogers, Alexander B.
AU - Schneider, Evan
AU - Charlot, Stephane
AU - Stark, Daniel P.
AU - Furlanetto, Steven R.
AU - Cirasuolo, Michele
PY - 2013/5/10
Y1 - 2013/5/10
N2 - We present a catalog of high-redshift star-forming galaxies selected to lie within the redshift range z ≃ 7-8 using the Ultra Deep Field 2012 (UDF12), the deepest near-infrared (near-IR) exposures yet taken with the Hubble Space Telescope (HST). As a result of the increased near-IR exposure time compared to previous HST imaging in this field, we probe ∼0.65 (0.25) mag fainter in absolute UV magnitude, at z ∼ 7 (8), which increases confidence in a measurement of the faint end slope of the galaxy luminosity function. Through a 0.7 mag deeper limit in the key F105W filter that encompasses or lies just longward of the Lyman break, we also achieve a much-refined color-color selection that balances high redshift completeness and a low expected contamination fraction. We improve the number of dropout-selected UDF sources to 47 at z ∼ 7 and 27 at z ∼ 8. Incorporating brighter archival and ground-based samples, we measure the z ≃ 7 UV luminosity function to an absolute magnitude limit of M UV = -17 and find a faint end Schechter slope of . Using a similar color-color selection at z ≃ 8 that takes our newly added imaging in the F140W filter into account, and incorporating archival data from the HIPPIES and BoRG campaigns, we provide a robust estimate of the faint end slope at z ≃ 8, . We briefly discuss our results in the context of earlier work and that derived using the same UDF12 data but with an independent photometric redshift technique.
AB - We present a catalog of high-redshift star-forming galaxies selected to lie within the redshift range z ≃ 7-8 using the Ultra Deep Field 2012 (UDF12), the deepest near-infrared (near-IR) exposures yet taken with the Hubble Space Telescope (HST). As a result of the increased near-IR exposure time compared to previous HST imaging in this field, we probe ∼0.65 (0.25) mag fainter in absolute UV magnitude, at z ∼ 7 (8), which increases confidence in a measurement of the faint end slope of the galaxy luminosity function. Through a 0.7 mag deeper limit in the key F105W filter that encompasses or lies just longward of the Lyman break, we also achieve a much-refined color-color selection that balances high redshift completeness and a low expected contamination fraction. We improve the number of dropout-selected UDF sources to 47 at z ∼ 7 and 27 at z ∼ 8. Incorporating brighter archival and ground-based samples, we measure the z ≃ 7 UV luminosity function to an absolute magnitude limit of M UV = -17 and find a faint end Schechter slope of . Using a similar color-color selection at z ≃ 8 that takes our newly added imaging in the F140W filter into account, and incorporating archival data from the HIPPIES and BoRG campaigns, we provide a robust estimate of the faint end slope at z ≃ 8, . We briefly discuss our results in the context of earlier work and that derived using the same UDF12 data but with an independent photometric redshift technique.
KW - dark ages
KW - first stars
KW - galaxies: evolution
KW - galaxies: formation
KW - reionization
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U2 - 10.1088/0004-637X/768/2/196
DO - 10.1088/0004-637X/768/2/196
M3 - Article
AN - SCOPUS:84877030476
SN - 0004-637X
VL - 768
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 196
ER -