A Ly alpha halo around a quasar at redshift z=6.4

  1. Get@NRC: A Ly alpha halo around a quasar at redshift z=6.4 (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1088/0004-6256/142/6/186
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Journal titleThe Astronomical journal
Pages186-1186-7; # of pages: 7
Subjectcosmology: observations; quasars: emission lines; quasars: general
AbstractWe present long-slit spectroscopic data that reveal extended Lyα emission around the z = 6.417 radio-quiet quasar CFHQS J2329-0301. The Lyα emission is extended over 15 kpc and has a luminosity of >8 x 10³⁶ W, comparable to the most luminous Lyα halos known. The emission has complex kinematics, in part due to foreground absorption, which only partly covers the extended nebula. The velocity ranges from -500 km s⁻¹ to +500 km s⁻¹, with a peak remarkably close to the systemic velocity identified by broad Mg II emission of the quasar. There is no evidence for infall or outflow of the halo gas. We speculate that the Lyα emission mechanism is recombination after quasar photoionization of gas sitting within a high-mass dark matter halo. The immense Lyα luminosity indicates a higher covering factor of cold gas compared with typical radio-quiet quasars at lower redshift.
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AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19669798
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Record identifier094b6a2b-4ba3-45e6-a109-4a3a7b963b7b
Record created2012-03-16
Record modified2016-05-09
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