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Title: Statistical properties of diffuse Lyα haloes around star-forming galaxies at z ~ 2
Authors: Rieko Momose
Masami Ouchi
Kimihiko Nakajima
Yoshiaki Ono
Takatoshi Shibuya
Kazuhiro Shimasaku
Suraphong Yuma
Masao Mori
Masayuki Umemura
University of Tokyo
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
National Tsing Hua University
Université de Genève
University of Tsukuba
Research Center for the Early Universe
Mahidol University
Keywords: Earth and Planetary Sciences
Issue Date: 11-Apr-2016
Citation: Monthly Notices of the Royal Astronomical Society. Vol.457, No.3 (2016), 2318-2330
Abstract: © 2016 The Authors. We present statistical properties of diffuse Lyα haloes (LAHs) around high-z star-forming galaxies with large Subaru samples of Lyα emitters (LAEs) at z = 2.2. We make subsamples defined by the physical quantities of LAEs' central Lyα luminosities, ultraviolet (UV) magnitudes, Lyα equivalent widths, and UV slopes, and investigate LAHs' radial surface brightness (SB) profiles and scale lengths rnas a function of these physical quantities. We find that there exist prominent LAHs around LAEs with faint Lyα luminosities, bright UV luminosities, and small Lyα equivalent widths in cumulative radial Lyα SB profiles. We confirm this trend with the anticorrelation between rnand Lyα luminosities (equivalent widths) based on the Spearman's rank correlation coefficient that is ρ = -0.9 (-0.7) corresponding to the 96 per cent (93 per cent) confidence level, although the correlation between rnand UV magnitudes is not clearly found in the rank correlation coefficient. Our results suggest that LAEs with properties similar to typical Lyman-break galaxies (with faint Lyα luminosities and small equivalent widths) possess more prominent LAHs. We investigate scenarios for the major physical origins of LAHs with our results. Because we find relatively small Lyα equivalent widths up to 77 Å in LAHs that include LAEs' central components, these results suggest that the cold stream scenario is not preferred. There remain two possible scenarios of Lyα scattering in circumgalactic medium and satellite galaxies that cannot be tested with our observational data.
ISSN: 13652966
Appears in Collections:Scopus 2016-2017

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