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Title:
Redshifts of Emission-Line Objects in the Hubble Ultra Deep Field
Authors:
Xu, Chun; Pirzkal, Norbert; Malhotra, Sangeeta; Rhoads, James E.; Mobasher, Bahram; Daddi, Emanuele; Gronwall, Caryl; Hathi, Nimish P.; Panagia, Nino; Ferguson, Henry C.; Koekemoer, Anton M.; Kümmel, Martin; Moustakas, Leonidas A.; Pasquali, Anna; di Serego Alighieri, Sperello; Vernet, Joel; Walsh, Jeremy R.; Windhorst, Rogier; Yan, Haojing
Affiliation:
AA(Space Telescope Science Institute, Baltimore, MD 21218, USA; .), AB(Space Telescope Science Institute, Baltimore, MD 21218, USA; .), AC(Space Telescope Science Institute, Baltimore, MD 21218, USA; .; School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA.), AD(Space Telescope Science Institute, Baltimore, MD 21218, USA; .; School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA.), AE(Space Telescope Science Institute, Baltimore, MD 21218, USA; .), AF(Spitzer Fellow, National Optical Astronomy Observatory, Tucson, AZ 85726, USA.), AG(Department of Astronomy, Pennsylvania State University, University Park, PA 16802, USA.), AH(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287, USA.), AI(Space Telescope Science Institute, Baltimore, MD 21218, USA; .), AJ(Space Telescope Science Institute, Baltimore, MD 21218, USA; .), AK(Space Telescope Science Institute, Baltimore, MD 21218, USA; .), AL(ESO Space Telescope European Coordinating Facility, D-85748 Garching, Germany.), AM(Space Telescope Science Institute, Baltimore, MD 21218, USA; .), AN(Institute of Astronomy, ETH Hoenggerberg, CH-8093 Zurich, Switzerland.), AO(INAF-Osservatorio Astrofisico di Arcetri, I-50125 Firenze, Italy.), AP(INAF-Osservatorio Astrofisico di Arcetri, I-50125 Firenze, Italy.), AQ(ESO Space Telescope European Coordinating Facility, D-85748 Garching, Germany.), AR(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA.), AS(Spitzer Science Center, Caltech, Pasadena, CA 91125, USA.)
Publication:
The Astronomical Journal, Volume 134, Issue 1, pp. 169-178. (AJ Homepage)
Publication Date:
07/2007
Origin:
UCP
AJ Keywords:
Galaxies: Formation, Galaxies: High-Redshift, Galaxies: Starburst
DOI:
10.1086/513512
Bibliographic Code:
2007AJ....134..169X

Abstract

We present redshifts for 115 emission-line objects in the Hubble Ultra Deep Field identified through the Grism ACS Program for Extragalactic Science (GRAPES) project using the slitless grism spectroscopy mode of the Advanced Camera for Surveys on the Hubble Space Telescope (HST). The sample was selected by an emission-line search on all extracted one-dimensional GRAPES spectra. We identify the emission lines using line wavelength ratios where multiple lines are detected in the grism wavelength range (5800 Å<~λ<~9600 Å), and using photometric redshift information where multiple lines are unavailable. We then derive redshifts using the identified lines. Our redshifts are accurate to δz~0.009, based on both statistical uncertainty estimates and comparison with published ground-based spectra. Over 40% of our sample is fainter than typical magnitude limits for ground-based spectroscopy (with iAB>25 mag). Such emission lines would likely remain undiscovered without our deep survey. The emission-line objects fall into three categories: (1) most are low- to moderate-redshift galaxies (0<=z<=2), including many actively star-forming galaxies with strong H II regions; (2) nine are high-redshift (4<=z<=7) Lyα emitters; and (3) at least three are candidate active galactic nuclei.
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