A pilot survey for C III] emission in the reionization era: Gravitationally lensed z ∼ 7-8 galaxies in the Frontier Fields cluster Abell 2744

Adi Zitrin, Richard S. Ellis, Sirio Belli, Daniel P Stark

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report results of a search for C iii] 1907, 1909 emission using Keck's MOSFIRE spectrograph in a sample of 7 candidates () lensed by the Hubble Frontier Field cluster Abell 2744. Earlier work has suggested the promise of using the C iii] doublet for redshift confirmation of galaxies in the reionization era given that Lyα (λ1216) is likely attenuated by the neutral intergalactic medium. The primary challenge of this approach is the feasibility of locating C iii] emission without advanced knowledge of the spectroscopic redshift. With an integration time of 5 hr in the H band, we reach a median flux limit (in between the skylines) of ergs cm<sup>-2</sup> s<sup>-1</sup> but no convincing C iii] emission was found. We also incorporate preliminary measurements from two other CLASH/HFF clusters in which, similarly, no line was detected, but these were observed to lesser depth. Using the known distribution of OH emission and the photometric redshift likelihood distribution of each lensed candidate, we present statistical upper limits on the mean total C iii] rest-frame equivalent width (EW) for our sample. For a signal-to-noise ratio of 5, we estimate that the typical C iii] doublet rest-frame EW is, with 95% confidence,. Although consistent with the strength of earlier detections in brighter objects at , our study illustrates the necessity of studying more luminous or strongly lensed examples prior to the launch of the James Webb Space Telescope.

Original languageEnglish (US)
Article numberL7
JournalAstrophysical Journal Letters
Volume805
Issue number1
DOIs
StatePublished - May 20 2015

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galaxies
James Webb Space Telescope
intergalactic media
erg
signal-to-noise ratio
spectrographs
confidence
signal to noise ratios
estimates
distribution
detection

Keywords

  • cosmology: observations
  • galaxies: clusters: general
  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift
  • gravitational lensing: strong

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

A pilot survey for C III] emission in the reionization era : Gravitationally lensed z ∼ 7-8 galaxies in the Frontier Fields cluster Abell 2744. / Zitrin, Adi; Ellis, Richard S.; Belli, Sirio; Stark, Daniel P.

In: Astrophysical Journal Letters, Vol. 805, No. 1, L7, 20.05.2015.

Research output: Contribution to journalArticle

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abstract = "We report results of a search for C iii] 1907, 1909 emission using Keck's MOSFIRE spectrograph in a sample of 7 candidates () lensed by the Hubble Frontier Field cluster Abell 2744. Earlier work has suggested the promise of using the C iii] doublet for redshift confirmation of galaxies in the reionization era given that Lyα (λ1216) is likely attenuated by the neutral intergalactic medium. The primary challenge of this approach is the feasibility of locating C iii] emission without advanced knowledge of the spectroscopic redshift. With an integration time of 5 hr in the H band, we reach a median flux limit (in between the skylines) of ergs cm-2 s-1 but no convincing C iii] emission was found. We also incorporate preliminary measurements from two other CLASH/HFF clusters in which, similarly, no line was detected, but these were observed to lesser depth. Using the known distribution of OH emission and the photometric redshift likelihood distribution of each lensed candidate, we present statistical upper limits on the mean total C iii] rest-frame equivalent width (EW) for our sample. For a signal-to-noise ratio of 5, we estimate that the typical C iii] doublet rest-frame EW is, with 95{\%} confidence,. Although consistent with the strength of earlier detections in brighter objects at , our study illustrates the necessity of studying more luminous or strongly lensed examples prior to the launch of the James Webb Space Telescope.",
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