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        An 80-kpc Ly alpha halo around a high-redshift type-2 quasi-stellar object

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        903198.pdf (PDF, 323Kb)
        Author
        Smith, Daniel
        Jarvis, M.J.
        Simpson, C.
        Martinez-Sansigre, A.
        Attention
        2299/3630
        Abstract
        We announce the discovery of an extended emission line region associated with a high redshift type-2 QSO. The halo, which was discovered in our new wide-field narrow-band survey, resides at z = 2.85 in the Spitzer First Look Survey region and is extended over 80 kpc. Deep VLBI observations imply that approximately 50 per cent of the radio emission is extended on scales > 200pc. The inferred AGN luminosity is sufficient to ionize the extended halo, and the optical emission is consistent with being triggered coevally with the radio source. The Lyman- α halo is as luminous as those found around high redshift radio galaxies, however the active nucleus is several orders of magnitude less luminous at radio wavelengths than those FRIIs more commonly associated with extended emission line regions. AMS05 appears to be a highredshift analogue to the radio-quiet quasar E1821+643which is core dominated but which also exhibits extended FRI-like structure and contains an optically powerfulAGN.
        Publication date
        2009
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1111/j.1365-2966.2008.14232.x
        Other links
        http://hdl.handle.net/2299/3630
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