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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
No evidence for Lyman α emission in spectroscopy of z > 7 candidate galaxies
Monthly Notices of the Royal Astronomical Society, Volume 427, No. 4, Year 2012
Notification
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Description
We present Gemini/Gemini Near Infrared Spectrograph (GNIRS) spectroscopic observations of four z-band (z ≈ 7) dropout galaxies and Very Large Telescope (VLT)/XSHOOTER observations of one z-band dropout and three Y-band (z≈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 a emission with a typical 5s sensitivity of 5 × 10-18 erg cm-2 s-1, and use the upper limits on Lyman a 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 α rest-frame equivalent width limit >120 Å (for an unresolved emission line); for an equivalent width limit of 50 Å 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 ≈1σ level for spectrally unresolved lines, which may indicate that a significant neutral HI fraction in the intergalactic medium suppresses the Lyman α line in z-drop and Y-drop galaxies at z > 7. © 2012 The Authors.
Authors & Co-Authors
Caruana, Joseph
United Kingdom, Oxford
University of Oxford
Bunker, Andrew J.
United Kingdom, Oxford
University of Oxford
Wilkins, Stephen M.
United Kingdom, Oxford
University of Oxford
Stanway, Elizabeth R.
United Kingdom, Coventry
Faculty of Science, Engineering and Medicine
Lacy, Mark D.
United States, Charlottesville
National Radio Astronomy Observatory
Jarvis, Matthew J.
United Kingdom, Hatfield
University of Hertfordshire
South Africa, Bellville
University of the Western Cape
Lorenzoni, Silvio
United Kingdom, Oxford
University of Oxford
Hickey, Samantha
United Kingdom, Hatfield
University of Hertfordshire
Statistics
Citations: 77
Authors: 8
Affiliations: 5
Identifiers
Doi:
10.1111/j.1365-2966.2012.21996.x
ISSN:
00358711
e-ISSN:
13652966
Research Areas
Environmental
Health System And Policy
Study Design
Cross Sectional Study
Study Approach
Quantitative