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        Discovery of an Ultraviolet Counterpart to an Ultra-Fast X-ray Outflow in the Quasar PG1211+143

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        Kriss_et_al_ultraviolet_counterpart_accepted_manuscript.pdf (PDF, 652Kb)
        Author
        Kriss, Gerard A.
        Lee, Julia C.
        Danehkar, Ashkbiz
        Nowak, Michael A.
        Fang, Taotao
        Hardcastle, Martin J.
        Neilsen, Joseph
        Young, Andrew
        Attention
        2299/20148
        Abstract
        We observed the quasar PG 1211+143 using the Cosmic Origins Spectrograph on the Hubble Space Telescope in 2015 April as part of a joint campaign with the Chandra X-ray Observatory and the Jansky Very Large Array. Our ultraviolet spectra cover the wavelength range 912-2100 Å. We find a broad absorption feature () at an observed wavelength of 1240 Å. Interpreting this as H i Lyα, in the rest frame of PG 1211+143 (z = 0.0809), this corresponds to an outflow velocity of -16,980 (outflow redshift ), matching the moderate ionization X-ray absorption system detected in our Chandra observation and reported previously by Pounds et al. With a minimum H i column density of , and no absorption in other UV resonance lines, this Lyα absorber is consistent with arising in the same ultrafast outflow as the X-ray absorbing gas. The Lyα feature is weak or absent in archival ultraviolet spectra of PG 1211+143, strongly suggesting that this absorption is transient, and intrinsic to PG 1211+143. Such a simultaneous detection in two independent wavebands for the first time gives strong confirmation of the reality of an ultrafast outflow in an active galactic nucleus.
        Publication date
        2018-02-02
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/aaa42b
        Other links
        http://hdl.handle.net/2299/20148
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