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The UV Luminosity Function of Star-forming Galaxies via Dropout Selection at Redshifts z ~ 7 and 8 from the 2012 Ultra Deep Field Campaign

Schenker, Matthew A. and Robertson, Brant E. and Ellis, Richard S. and Ono, Yoshiaki and McLure, Ross J. and Dunlop, James S. and Koekemoer, Anton and Bowler, Rebecca A. A. and Ouchi, Masami and Curtis-Lake, Emma and Rogers, Alexander B. and Schneider, Evan and Charlot, Stéphane and Stark, Daniel P. and Furlanetto, Steven R. and Cirasuolo, Michele (2013) The UV Luminosity Function of Star-forming Galaxies via Dropout Selection at Redshifts z ~ 7 and 8 from the 2012 Ultra Deep Field Campaign. Astrophysical Journal, 768 (2). Art. No. 196. ISSN 0004-637X.

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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 ɑ =-1.87^(+0.18)_(-0.17). 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, ɑ =-1.94^(+0.21)_(-0.24). 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Robertson, Brant E.0000-0002-4271-0364
Ellis, Richard S.0000-0001-7782-7071
Koekemoer, Anton0000-0002-6610-2048
Ouchi, Masami0000-0002-1049-6658
Furlanetto, Steven R.0000-0002-0658-1243
Additional Information:© 2013 American Astronomical Society. Received 2013 January 7; accepted 2013 March 22; published 2013 April 26. US authors acknowledge financial support from the Space Telescope Science Institute under award HST-GO-12498.01-A. J.S.D. acknowledges support of the European Research Council and the Royal Society. R.J.M. acknowledges funding from the Leverhulme Trust. S.C. acknowledges the support of the European Commission through the Marie Curie Initial Training Network ELIXIR. This work is based on data from the Hubble Space Telescope operated by NASA through the Space Telescope Science Institute via the association of Universities for Research in Astronomy, Inc. under contract NAS5-26555.
Funding AgencyGrant Number
European Research Council (ERC)UNSPECIFIED
Leverhulme TrustUNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Subject Keywords: dark ages, reionization, first stars; galaxies: evolution; galaxies: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20130605-091235436
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Official Citation:The UV Luminosity Function of Star-forming Galaxies via Dropout Selection at Redshifts z ~ 7 and 8 from the 2012 Ultra Deep Field Campaign Matthew A. Schenker, Brant E. Robertson, Richard S. Ellis, Yoshiaki Ono, Ross J. McLure, James S. Dunlop, Anton Koekemoer, Rebecca A. A. Bowler, Masami Ouchi, Emma Curtis-Lake, Alexander B. Rogers, Evan Schneider, Stephane Charlot, Daniel P. Stark, Steven R. Furlanetto, and Michele Cirasuolo doi:10.1088/0004-637X/768/2/196
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38804
Deposited By: Ruth Sustaita
Deposited On:05 Jun 2013 16:37
Last Modified:09 Mar 2020 13:19

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