Redshifts of emission-line objects in the hubble ultra deep field

Chun Xu; Norbert Pirzkal; Sangeeta Malhotra; James E. Rhoads; Bahram Mobasher; Emanuele Daddi; Caryl Gronwall; Nimish P. Hathi; Nino Panagia; Henry C. Ferguson; Anton M. Koekemoer; Martin Kümmel; Leonidas A. Moustakas; Anna Pasquali; Sperello Di Serego Alighieri; Joel Vernet; Jeremy R. Walsh; Rogier Windhorst; Haojing Yan

doi:10.1086/513512

Redshifts of emission-line objects in the hubble ultra deep field

Chun Xu, Norbert Pirzkal, Sangeeta Malhotra, James E. Rhoads, Bahram Mobasher, Emanuele Daddi, Caryl Gronwall, Nimish P. Hathi, Nino Panagia, Henry C. Ferguson, Anton M. Koekemoer, Martin Kümmel, Leonidas A. Moustakas, Anna Pasquali, Sperello Di Serego Alighieri, Joel Vernet, Jeremy R. Walsh, Rogier Windhorst, Haojing Yan

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

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 Z'AB > 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.

Original language	English (US)
Pages (from-to)	169-178
Number of pages	10
Journal	Astronomical Journal
Volume	134
Issue number	1
DOIs	https://doi.org/10.1086/513512
State	Published - Jul 2007

Keywords

Galaxies: formation
Galaxies: high-redshift
Galaxies: starburst

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/513512

Cite this

Xu, C., Pirzkal, N., Malhotra, S., Rhoads, J. E., Mobasher, B., Daddi, E., Gronwall, C., Hathi, N. P., Panagia, N., Ferguson, H. C., Koekemoer, A. M., Kümmel, M., Moustakas, L. A., Pasquali, A., Di Serego Alighieri, S., Vernet, J., Walsh, J. R., Windhorst, R., & Yan, H. (2007). Redshifts of emission-line objects in the hubble ultra deep field. Astronomical Journal, 134(1), 169-178. https://doi.org/10.1086/513512

Xu, C, Pirzkal, N, Malhotra, S, Rhoads, JE, Mobasher, B, Daddi, E, Gronwall, C, Hathi, NP, Panagia, N, Ferguson, HC, Koekemoer, AM, Kümmel, M, Moustakas, LA, Pasquali, A, Di Serego Alighieri, S, Vernet, J, Walsh, JR, Windhorst, R & Yan, H 2007, 'Redshifts of emission-line objects in the hubble ultra deep field', Astronomical Journal, vol. 134, no. 1, pp. 169-178. https://doi.org/10.1086/513512

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title = "Redshifts of emission-line objects in the hubble ultra deep field",

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 {\AA} ≤ λ≤ 9600 {\AA}), 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 Z'AB > 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.",

keywords = "Galaxies: formation, Galaxies: high-redshift, Galaxies: starburst",

author = "Chun Xu and Norbert Pirzkal and Sangeeta Malhotra and Rhoads, {James E.} and Bahram Mobasher and Emanuele Daddi and Caryl Gronwall and Hathi, {Nimish P.} and Nino Panagia and Ferguson, {Henry C.} and Koekemoer, {Anton M.} and Martin K{\"u}mmel and Moustakas, {Leonidas A.} and Anna Pasquali and {Di Serego Alighieri}, Sperello and Joel Vernet and Walsh, {Jeremy R.} and Rogier Windhorst and Haojing Yan",

year = "2007",

month = jul,

doi = "10.1086/513512",

language = "English (US)",

volume = "134",

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T1 - Redshifts of emission-line objects in the hubble ultra deep field

AU - Xu, Chun

AU - Pirzkal, Norbert

AU - Malhotra, Sangeeta

AU - Rhoads, James E.

AU - Mobasher, Bahram

AU - Daddi, Emanuele

AU - Gronwall, Caryl

AU - Hathi, Nimish P.

AU - Panagia, Nino

AU - Ferguson, Henry C.

AU - Koekemoer, Anton M.

AU - Kümmel, Martin

AU - Moustakas, Leonidas A.

AU - Pasquali, Anna

AU - Di Serego Alighieri, Sperello

AU - Vernet, Joel

AU - Walsh, Jeremy R.

AU - Windhorst, Rogier

AU - Yan, Haojing

PY - 2007/7

Y1 - 2007/7

N2 - 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 Z'AB > 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.

AB - 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 Z'AB > 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.

KW - Galaxies: formation

KW - Galaxies: high-redshift

KW - Galaxies: starburst

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JO - Astronomical Journal

JF - Astronomical Journal

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ER -

Redshifts of emission-line objects in the hubble ultra deep field

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Redshifts of UDF emission-line objects

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Redshifts of emission-line objects in the hubble ultra deep field

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ASJC Scopus subject areas

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Redshifts of UDF emission-line objects

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