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Title: THE UV LUMINOSITY FUNCTION OF STAR-FORMING GALAXIES VIA DROPOUT SELECTION AT REDSHIFTS z {approx} 7 AND 8 FROM THE 2012 ULTRA DEEP FIELD CAMPAIGN

Abstract

We present a catalog of high-redshift star-forming galaxies selected to lie within the redshift range z {approx_equal} 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 {approx}0.65 (0.25) mag fainter in absolute UV magnitude, at z {approx} 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 {approx} 7 and 27 at z {approx} 8. Incorporating brighter archival and ground-based samples, we measure the z {approx_equal} 7 UV luminosity function to an absolute magnitude limit of M{sub UV} = -17 and find a faint end Schechter slope of {alpha}=-1.87{sup +0.18}{sub -0.17}. Using a similar color-color selection at z {approx_equal} 8 that takes our newly added imaging in the F140W filtermore » into account, and incorporating archival data from the HIPPIES and BoRG campaigns, we provide a robust estimate of the faint end slope at z {approx_equal} 8, {alpha}=-1.94{sup +0.21}{sub -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.« less

Authors:
;  [1]; ;  [2]; ; ;  [3]; ; ; ; ; ;  [4];  [5];  [6]
  1. Department of Astrophysics, California Institute of Technology, MC 249-17, Pasadena, CA 91125 (United States)
  2. Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)
  3. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa City, Chiba 277-8582 (Japan)
  4. Institute for Astronomy, University of Edinburgh, Edinburgh EH9 3HJ (United Kingdom)
  5. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
  6. UPMC-CNRS, UMR7095, Institut d'Astrophysique de Paris, F-75014 Paris (France)
Publication Date:
OSTI Identifier:
22126701
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 768; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BALANCES; CATALOGS; EVOLUTION; FILTERS; GALAXIES; LUMINOSITY; PROBES; RED SHIFT; SPACE; STARS; TELESCOPES

Citation Formats

Schenker, Matthew A., Ellis, Richard S., Robertson, Brant E., Schneider, Evan, Ono, Yoshiaki, Ouchi, Masami, Stark, Daniel P., McLure, Ross J., Dunlop, James S., Bowler, Rebecca A. A., Curtis-Lake, Emma, Rogers, Alexander B., Cirasuolo, Michele, Koekemoer, Anton, Charlot, Stephane, and Furlanetto, Steven R., E-mail: schenker@astro.caltech.edu. THE UV LUMINOSITY FUNCTION OF STAR-FORMING GALAXIES VIA DROPOUT SELECTION AT REDSHIFTS z {approx} 7 AND 8 FROM THE 2012 ULTRA DEEP FIELD CAMPAIGN. United States: N. p., 2013. Web. doi:10.1088/0004-637X/768/2/196.
Schenker, Matthew A., Ellis, Richard S., Robertson, Brant E., Schneider, Evan, Ono, Yoshiaki, Ouchi, Masami, Stark, Daniel P., McLure, Ross J., Dunlop, James S., Bowler, Rebecca A. A., Curtis-Lake, Emma, Rogers, Alexander B., Cirasuolo, Michele, Koekemoer, Anton, Charlot, Stephane, & Furlanetto, Steven R., E-mail: schenker@astro.caltech.edu. THE UV LUMINOSITY FUNCTION OF STAR-FORMING GALAXIES VIA DROPOUT SELECTION AT REDSHIFTS z {approx} 7 AND 8 FROM THE 2012 ULTRA DEEP FIELD CAMPAIGN. United States. https://doi.org/10.1088/0004-637X/768/2/196
Schenker, Matthew A., Ellis, Richard S., Robertson, Brant E., Schneider, Evan, Ono, Yoshiaki, Ouchi, Masami, Stark, Daniel P., McLure, Ross J., Dunlop, James S., Bowler, Rebecca A. A., Curtis-Lake, Emma, Rogers, Alexander B., Cirasuolo, Michele, Koekemoer, Anton, Charlot, Stephane, and Furlanetto, Steven R., E-mail: schenker@astro.caltech.edu. 2013. "THE UV LUMINOSITY FUNCTION OF STAR-FORMING GALAXIES VIA DROPOUT SELECTION AT REDSHIFTS z {approx} 7 AND 8 FROM THE 2012 ULTRA DEEP FIELD CAMPAIGN". United States. https://doi.org/10.1088/0004-637X/768/2/196.
@article{osti_22126701,
title = {THE UV LUMINOSITY FUNCTION OF STAR-FORMING GALAXIES VIA DROPOUT SELECTION AT REDSHIFTS z {approx} 7 AND 8 FROM THE 2012 ULTRA DEEP FIELD CAMPAIGN},
author = {Schenker, Matthew A. and Ellis, Richard S. and Robertson, Brant E. and Schneider, Evan and Ono, Yoshiaki and Ouchi, Masami and Stark, Daniel P. and McLure, Ross J. and Dunlop, James S. and Bowler, Rebecca A. A. and Curtis-Lake, Emma and Rogers, Alexander B. and Cirasuolo, Michele and Koekemoer, Anton and Charlot, Stephane and Furlanetto, Steven R., E-mail: schenker@astro.caltech.edu},
abstractNote = {We present a catalog of high-redshift star-forming galaxies selected to lie within the redshift range z {approx_equal} 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 {approx}0.65 (0.25) mag fainter in absolute UV magnitude, at z {approx} 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 {approx} 7 and 27 at z {approx} 8. Incorporating brighter archival and ground-based samples, we measure the z {approx_equal} 7 UV luminosity function to an absolute magnitude limit of M{sub UV} = -17 and find a faint end Schechter slope of {alpha}=-1.87{sup +0.18}{sub -0.17}. Using a similar color-color selection at z {approx_equal} 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 {approx_equal} 8, {alpha}=-1.94{sup +0.21}{sub -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.},
doi = {10.1088/0004-637X/768/2/196},
url = {https://www.osti.gov/biblio/22126701}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 768,
place = {United States},
year = {Fri May 10 00:00:00 EDT 2013},
month = {Fri May 10 00:00:00 EDT 2013}
}