Searching for z 7.7 Lyα emitters in the cosmos field with newfirm

Hannah B. Krug, Sylvain Veilleux, Vithal Tilvi, Sangeeta Malhotra, James Rhoads, Pascale Hibon, Rob Swaters, Ron Probst, Arjun Dey, Mark Dickinson, Buell Tomasson Jannuzi

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The study of Lyα emission in the high-redshift universe is a useful probe of the epoch of reionization, as the Lyα line should be attenuated by the intergalactic medium (IGM) at low to moderate neutral hydrogen fractions. Here we present the results of a deep and wide imaging search for Lyα emitters in the Cosmological Evolution Survey field. We have used two ultra-narrowband filters (filter width of 8-9 ) on the NOAO Extremely Wide-Field Infrared Mosaic camera, installed on the Mayall 4 m telescope at Kitt Peak National Observatory, in order to isolate Lyα emitters at z = 7.7; such ultra-narrowband imaging searches have proved to be excellent at detecting Lyα emitters. We found 5σ detections of four candidate Lyα emitters in a survey volume of 2.8 × 104Mpc3 (total survey area 760 arcmin2). Each candidate has a line flux greater than 8 × 10-18ergs-1cm-2. Using these results to construct a luminosity function and comparing to previously established Lyα luminosity functions at z = 5.7 and z = 6.5, we find no conclusive evidence for evolution of the luminosity function between z = 5.7 and z = 7.7. Statistical Monte Carlo simulations suggest that half of these candidates are real z = 7.7 targets, and spectroscopic follow-up will be required to verify the redshift of these candidates. However, our results are consistent with no strong evolution in the neutral hydrogen fraction of the IGM between z = 5.7 and z = 7.7, even if only one or two of the z = 7.7 candidates are spectroscopically confirmed.

Original languageEnglish (US)
Article number122
JournalAstrophysical Journal
Volume745
Issue number2
DOIs
StatePublished - Feb 1 2012
Externally publishedYes

Fingerprint

cosmos
emitters
intergalactic media
luminosity
hydrogen
filter
narrowband
filters
field survey
observatory
probe
observatories
universe
cameras
time measurement
telescopes
simulation
probes

Keywords

  • dark ages, reionization, first stars
  • galaxies: high-redshift
  • galaxies: luminosity function, mass function

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Krug, H. B., Veilleux, S., Tilvi, V., Malhotra, S., Rhoads, J., Hibon, P., ... Jannuzi, B. T. (2012). Searching for z 7.7 Lyα emitters in the cosmos field with newfirm. Astrophysical Journal, 745(2), [122]. https://doi.org/10.1088/0004-637X/745/2/122

Searching for z 7.7 Lyα emitters in the cosmos field with newfirm. / Krug, Hannah B.; Veilleux, Sylvain; Tilvi, Vithal; Malhotra, Sangeeta; Rhoads, James; Hibon, Pascale; Swaters, Rob; Probst, Ron; Dey, Arjun; Dickinson, Mark; Jannuzi, Buell Tomasson.

In: Astrophysical Journal, Vol. 745, No. 2, 122, 01.02.2012.

Research output: Contribution to journalArticle

Krug, HB, Veilleux, S, Tilvi, V, Malhotra, S, Rhoads, J, Hibon, P, Swaters, R, Probst, R, Dey, A, Dickinson, M & Jannuzi, BT 2012, 'Searching for z 7.7 Lyα emitters in the cosmos field with newfirm', Astrophysical Journal, vol. 745, no. 2, 122. https://doi.org/10.1088/0004-637X/745/2/122
Krug HB, Veilleux S, Tilvi V, Malhotra S, Rhoads J, Hibon P et al. Searching for z 7.7 Lyα emitters in the cosmos field with newfirm. Astrophysical Journal. 2012 Feb 1;745(2). 122. https://doi.org/10.1088/0004-637X/745/2/122
Krug, Hannah B. ; Veilleux, Sylvain ; Tilvi, Vithal ; Malhotra, Sangeeta ; Rhoads, James ; Hibon, Pascale ; Swaters, Rob ; Probst, Ron ; Dey, Arjun ; Dickinson, Mark ; Jannuzi, Buell Tomasson. / Searching for z 7.7 Lyα emitters in the cosmos field with newfirm. In: Astrophysical Journal. 2012 ; Vol. 745, No. 2.
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abstract = "The study of Lyα emission in the high-redshift universe is a useful probe of the epoch of reionization, as the Lyα line should be attenuated by the intergalactic medium (IGM) at low to moderate neutral hydrogen fractions. Here we present the results of a deep and wide imaging search for Lyα emitters in the Cosmological Evolution Survey field. We have used two ultra-narrowband filters (filter width of 8-9 ) on the NOAO Extremely Wide-Field Infrared Mosaic camera, installed on the Mayall 4 m telescope at Kitt Peak National Observatory, in order to isolate Lyα emitters at z = 7.7; such ultra-narrowband imaging searches have proved to be excellent at detecting Lyα emitters. We found 5σ detections of four candidate Lyα emitters in a survey volume of 2.8 × 104Mpc3 (total survey area 760 arcmin2). Each candidate has a line flux greater than 8 × 10-18ergs-1cm-2. Using these results to construct a luminosity function and comparing to previously established Lyα luminosity functions at z = 5.7 and z = 6.5, we find no conclusive evidence for evolution of the luminosity function between z = 5.7 and z = 7.7. Statistical Monte Carlo simulations suggest that half of these candidates are real z = 7.7 targets, and spectroscopic follow-up will be required to verify the redshift of these candidates. However, our results are consistent with no strong evolution in the neutral hydrogen fraction of the IGM between z = 5.7 and z = 7.7, even if only one or two of the z = 7.7 candidates are spectroscopically confirmed.",
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