Redshifts of Emission-Line Objects in the Hubble Ultra Deep Field | Zendy

Chun Xu | Zendy; N. Pirzkal | Zendy; Sangeeta Malhotra | Zendy; James E. Rhoads | Zendy; Bahram Mobasher | Zendy; E. Daddi | Zendy; C. Gronwall | Zendy; Nimish P. Hathi | Zendy; N. Panagia | Zendy; Henry C. Ferguson | Zendy; Anton M. Koekemoer | Zendy; M. Kümmel | Zendy; Leonidas A. Moustakas | Zendy; A. Pasquali | Zendy; S. di Serego Alighieri | Zendy; J. Vernet | Zendy; J. R. Walsh | Zendy; Rogier A. Windhorst | Zendy; Haojing Yan | Zendy

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Redshifts of Emission-Line Objects in the Hubble Ultra Deep Field

Author(s) -

Chun Xu,

N. Pirzkal,

Sangeeta Malhotra,

James E. Rhoads,

Bahram Mobasher,

E. Daddi,

C. Gronwall,

Nimish P. Hathi,

N. Panagia,

Henry C. Ferguson,

Anton M. Koekemoer,

M. Kümmel,

Leonidas A. Moustakas,

A. Pasquali,

S. di Serego Alighieri,

J. Vernet,

J. R. Walsh,

Rogier A. Windhorst,

Haojing Yan

Publication year - 2007

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/513512

Subject(s) - grism , redshift , physics , astrophysics , galaxy , emission spectrum , hubble ultra deep field , astronomy , hubble deep field , spectroscopy , wide field camera 3 , line (geometry) , redshift survey , spectral line , hubble space telescope , geometry , mathematics

We present redshifts for 115 emission line objects in the Hubble Ultra DeepField (HUDF) identified through the GRism ACS Program for Extragalactic Science(GRAPES) project using the slitless grism spectroscopy mode of the ACS Cameraon the Hubble Space Telescope (HST). The sample was selected by an emissionline search on all extracted 1-dimensional GRAPES spectra. We identify theemission lines using line wavelength ratios where multiple lines are detectedin the grism wavelength range (5800A < lambda < 9600A), and using photometricredshift information where multiple lines are unavailable. We then deriveredshifts using the identified lines. Our redshifts are accurate to delta(z) =0.009, based on both statistical uncertainty estimates and comparison withpublished ground-based spectra. Over 40% of our sample is fainter than typicalmagnitude limits for ground-based spectroscopy (with i_{AB}>25 mag). Suchemission lines would likely remain undiscovered without our deep survey. Theemission line objects fall into 3 categories: 1) Most are low to moderateredshift galaxies (0 < z < 2), including many actively star forming galaxieswith strong HII regions; 2) 9 are high redshift (4 < z < 7) Lyman-alphaemitters; and 3) at least 3 are candidate AGNs.Comment: 30 pages, 5 figures. Accepted for publication in The Astronomical Journa

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