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No evidence for Lyman emission in spectroscopy of z > 7 candidate galaxies
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Caruana, J., Bunker, A. J., Wilkins, Stephen M., Stanway, Elizabeth R., Lacy, M., Jarvis, M. J., Lorenzoni, S. and Hickey, S. (2012) No evidence for Lyman emission in spectroscopy of z > 7 candidate galaxies. Monthly Notices of the Royal Astronomical Society, Vol.427 (No.4). pp. 3055-3070. doi:10.1111/j.1365-2966.2012.21996.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2012.21996.x
Abstract
We present Gemini/Gemini Near Infrared Spectrograph (GNIRS) spectroscopic observations of four z-band (z approximate to 7) dropout galaxies and Very Large Telescope (VLT)/XSHOOTER observations of one z-band dropout and three Y-band (z approximate to 8-9) dropout galaxies in the Hubble Ultra Deep Field, which were selected with Wide Field Camera 3 imaging on the Hubble Space Telescope. We find no evidence of Lyman alpha emission with a typical 5 sigma sensitivity of 5 x 10(-18) erg cm(-2) s(-1), and use the upper limits on Lyman alpha flux and the broad-band magnitudes to constrain the rest-frame equivalent widths for this line emission. Accounting for incomplete spectral coverage, we survey 3.0 z-band dropouts and 2.9 Y-band dropouts to a Lyman alpha rest-frame equivalent width limit > 120 angstrom (for an unresolved emission line); for an equivalent width limit of 50 angstrom the effective numbers of drop-outs surveyed fall to 1.2 z-band drop-outs and 1.5 Y-band drop-outs. A simple model where the fraction of high rest-frame equivalent width emitters follows the trend seen at z = 3-6.5 is inconsistent with our non-detections at z = 7-9 at the approximate to 1 sigma level for spectrally unresolved lines, which may indicate that a significant neutral H I fraction in the intergalactic medium suppresses the Lyman alpha line in z-drop and Y-drop galaxies at z > 7.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Wiley | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Vol.427 | ||||
Number: | No.4 | ||||
Page Range: | pp. 3055-3070 | ||||
DOI: | 10.1111/j.1365-2966.2012.21996.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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