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Date and Time of the Query: 2019-08-19 T05:54:06 PDT
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For refcode 2012MNRAS.427.3055C:
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Copyright by Royal Astronomical Society. 2012MNRAS.427.3055C No evidence for Lyman {alpha} emission in spectroscopy of z > 7 candidate galaxies Caruana, Joseph; Bunker, Andrew J.; Wilkins, Stephen M.; Stanway, Elizabeth R.; Lacy, Mark; Jarvis, Matt J.; Lorenzoni, Silvio; Hickey, Samantha Abstract. 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 {alpha} emission with a typical 5sigma 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 A (for an unresolved emission line); for an equivalent width limit of 50 A 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 ~1sigma 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. Based on observations collected at the European Organization for Astronomical Research in the Southern Hemisphere, Chile, as part of programme 086.A-0968(B). Key words: galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: starburst, ultraviolet: galaxies
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