A search for lyman break galaxies in the Chandra Deep Field South using swift ultraviolet/optical telescope

Antara R. Basu-Zych, Ann E. Hornschemeier, Erik A. Hoversten, Bret Lehmer, Caryl Gronwall

Research output: Contribution to journalArticle

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Abstract

While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. In this study, we use the UV/Optical Telescope (UVOT) instrument on board Swift to discover 0.5 < z < 2 Lyman break galaxies (LBGs). UVOT has covered 266 arcmin2 at >60ks exposure time, achieving a limiting magnitude of u < 24.5, in the Chandra Deep Field South (CDF-S). Applying UVOT near-ultraviolet color selection, we select 50 UV-dropouts from this UVOT CDF-S data. We match the selected sources with available multiwavelength data from Great Observatories Origins Deep Survey (GOODS) South, Multiwavelength Survey by Yale-Chile, and COMBO-17 to characterize the spectral energy distributions for these galaxies and determine stellar masses, star formation rates (SFRs), and dust attenuations. We compare these properties for LBGs selected in this paper versus z 3 LBGs and other CDF-S galaxies in the same redshift range (0.5 < z < 2), identified using photometric redshift techniques. The z 1 LBGs have stellar masses of 〈logM */M〉 = 9.4 0.6, which is slightly lower than z 3 LBGs (〈logM */M〉 = 10.2 0.4) and slightly higher compared with the z 1 CDF-S galaxies (〈logM */M〉 = 8.7 0.7). Similarly, our sample of z 1 LBGs has SFRs (derived using both ultraviolet and infrared data, where available) of 〈logSFR/(M yr-1)〉 = 0.7 0.6, nearly an order of magnitude lower than z 3 LBGs (〈logSFR/M yr-1〉 = 1.5 0.4), but slightly higher than the comparison z 1 sample of CDF-S galaxies (〈logSFR/M yr-1〉 = 0.2 0.7). We find that our z 1 UV-dropouts have 〈A FUV〉 = 2.0 1.0, which is higher than z 3 LBGs (〈A FUV〉 = 1.0 0.5), but similar to the distribution of dust attenuations in the other CDF-S galaxies (〈A FUV〉 2.8 1.5). Using the GOODS-South multiwavelength catalog of galaxies, we simulate a larger and fainter sample of LBGs to compare their properties with those of the UVOT-selected LBG sample. We conclude that UVOT can be useful for finding and studying the bright end of 0.5 < z < 2.0 LBGs.

Original languageEnglish (US)
Article number98
JournalAstrophysical Journal
Volume739
Issue number2
DOIs
StatePublished - Oct 1 2011

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telescopes
galaxies
observatory
optical instrument
dust
dropouts
star formation rate
stellar mass
observatories
attenuation
spectroscopy
Chile
spectral energy distribution
gamma ray bursts
catalogs
energy
color
distribution
rate
exposure

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Basu-Zych, Antara R. ; Hornschemeier, Ann E. ; Hoversten, Erik A. ; Lehmer, Bret ; Gronwall, Caryl. / A search for lyman break galaxies in the Chandra Deep Field South using swift ultraviolet/optical telescope. In: Astrophysical Journal. 2011 ; Vol. 739, No. 2.
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abstract = "While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. In this study, we use the UV/Optical Telescope (UVOT) instrument on board Swift to discover 0.5 < z < 2 Lyman break galaxies (LBGs). UVOT has covered 266 arcmin2 at >60ks exposure time, achieving a limiting magnitude of u < 24.5, in the Chandra Deep Field South (CDF-S). Applying UVOT near-ultraviolet color selection, we select 50 UV-dropouts from this UVOT CDF-S data. We match the selected sources with available multiwavelength data from Great Observatories Origins Deep Survey (GOODS) South, Multiwavelength Survey by Yale-Chile, and COMBO-17 to characterize the spectral energy distributions for these galaxies and determine stellar masses, star formation rates (SFRs), and dust attenuations. We compare these properties for LBGs selected in this paper versus z 3 LBGs and other CDF-S galaxies in the same redshift range (0.5 < z < 2), identified using photometric redshift techniques. The z 1 LBGs have stellar masses of 〈logM */M⊙〉 = 9.4 0.6, which is slightly lower than z 3 LBGs (〈logM */M⊙〉 = 10.2 0.4) and slightly higher compared with the z 1 CDF-S galaxies (〈logM */M⊙〉 = 8.7 0.7). Similarly, our sample of z 1 LBGs has SFRs (derived using both ultraviolet and infrared data, where available) of 〈logSFR/(M⊙ yr-1)〉 = 0.7 0.6, nearly an order of magnitude lower than z 3 LBGs (〈logSFR/M ⊙ yr-1〉 = 1.5 0.4), but slightly higher than the comparison z 1 sample of CDF-S galaxies (〈logSFR/M⊙ yr-1〉 = 0.2 0.7). We find that our z 1 UV-dropouts have 〈A FUV〉 = 2.0 1.0, which is higher than z 3 LBGs (〈A FUV〉 = 1.0 0.5), but similar to the distribution of dust attenuations in the other CDF-S galaxies (〈A FUV〉 2.8 1.5). Using the GOODS-South multiwavelength catalog of galaxies, we simulate a larger and fainter sample of LBGs to compare their properties with those of the UVOT-selected LBG sample. We conclude that UVOT can be useful for finding and studying the bright end of 0.5 < z < 2.0 LBGs.",
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A search for lyman break galaxies in the Chandra Deep Field South using swift ultraviolet/optical telescope. / Basu-Zych, Antara R.; Hornschemeier, Ann E.; Hoversten, Erik A.; Lehmer, Bret; Gronwall, Caryl.

In: Astrophysical Journal, Vol. 739, No. 2, 98, 01.10.2011.

Research output: Contribution to journalArticle

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AU - Gronwall, Caryl

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N2 - While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. In this study, we use the UV/Optical Telescope (UVOT) instrument on board Swift to discover 0.5 < z < 2 Lyman break galaxies (LBGs). UVOT has covered 266 arcmin2 at >60ks exposure time, achieving a limiting magnitude of u < 24.5, in the Chandra Deep Field South (CDF-S). Applying UVOT near-ultraviolet color selection, we select 50 UV-dropouts from this UVOT CDF-S data. We match the selected sources with available multiwavelength data from Great Observatories Origins Deep Survey (GOODS) South, Multiwavelength Survey by Yale-Chile, and COMBO-17 to characterize the spectral energy distributions for these galaxies and determine stellar masses, star formation rates (SFRs), and dust attenuations. We compare these properties for LBGs selected in this paper versus z 3 LBGs and other CDF-S galaxies in the same redshift range (0.5 < z < 2), identified using photometric redshift techniques. The z 1 LBGs have stellar masses of 〈logM */M⊙〉 = 9.4 0.6, which is slightly lower than z 3 LBGs (〈logM */M⊙〉 = 10.2 0.4) and slightly higher compared with the z 1 CDF-S galaxies (〈logM */M⊙〉 = 8.7 0.7). Similarly, our sample of z 1 LBGs has SFRs (derived using both ultraviolet and infrared data, where available) of 〈logSFR/(M⊙ yr-1)〉 = 0.7 0.6, nearly an order of magnitude lower than z 3 LBGs (〈logSFR/M ⊙ yr-1〉 = 1.5 0.4), but slightly higher than the comparison z 1 sample of CDF-S galaxies (〈logSFR/M⊙ yr-1〉 = 0.2 0.7). We find that our z 1 UV-dropouts have 〈A FUV〉 = 2.0 1.0, which is higher than z 3 LBGs (〈A FUV〉 = 1.0 0.5), but similar to the distribution of dust attenuations in the other CDF-S galaxies (〈A FUV〉 2.8 1.5). Using the GOODS-South multiwavelength catalog of galaxies, we simulate a larger and fainter sample of LBGs to compare their properties with those of the UVOT-selected LBG sample. We conclude that UVOT can be useful for finding and studying the bright end of 0.5 < z < 2.0 LBGs.

AB - While the Swift satellite is primarily designed to study gamma-ray bursts, its ultraviolet and optical imaging and spectroscopy capabilities are also being used for a variety of scientific programs. In this study, we use the UV/Optical Telescope (UVOT) instrument on board Swift to discover 0.5 < z < 2 Lyman break galaxies (LBGs). UVOT has covered 266 arcmin2 at >60ks exposure time, achieving a limiting magnitude of u < 24.5, in the Chandra Deep Field South (CDF-S). Applying UVOT near-ultraviolet color selection, we select 50 UV-dropouts from this UVOT CDF-S data. We match the selected sources with available multiwavelength data from Great Observatories Origins Deep Survey (GOODS) South, Multiwavelength Survey by Yale-Chile, and COMBO-17 to characterize the spectral energy distributions for these galaxies and determine stellar masses, star formation rates (SFRs), and dust attenuations. We compare these properties for LBGs selected in this paper versus z 3 LBGs and other CDF-S galaxies in the same redshift range (0.5 < z < 2), identified using photometric redshift techniques. The z 1 LBGs have stellar masses of 〈logM */M⊙〉 = 9.4 0.6, which is slightly lower than z 3 LBGs (〈logM */M⊙〉 = 10.2 0.4) and slightly higher compared with the z 1 CDF-S galaxies (〈logM */M⊙〉 = 8.7 0.7). Similarly, our sample of z 1 LBGs has SFRs (derived using both ultraviolet and infrared data, where available) of 〈logSFR/(M⊙ yr-1)〉 = 0.7 0.6, nearly an order of magnitude lower than z 3 LBGs (〈logSFR/M ⊙ yr-1〉 = 1.5 0.4), but slightly higher than the comparison z 1 sample of CDF-S galaxies (〈logSFR/M⊙ yr-1〉 = 0.2 0.7). We find that our z 1 UV-dropouts have 〈A FUV〉 = 2.0 1.0, which is higher than z 3 LBGs (〈A FUV〉 = 1.0 0.5), but similar to the distribution of dust attenuations in the other CDF-S galaxies (〈A FUV〉 2.8 1.5). Using the GOODS-South multiwavelength catalog of galaxies, we simulate a larger and fainter sample of LBGs to compare their properties with those of the UVOT-selected LBG sample. We conclude that UVOT can be useful for finding and studying the bright end of 0.5 < z < 2.0 LBGs.

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