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Title:
Emergence of a quasar outflow
Authors:
Hamann, F.; Kaplan, K. F.; Hidalgo, P. Rodríguez; Prochaska, J. X.; Herbert-Fort, S.
Affiliation:
AA(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA), AB(Department of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA 95064, USA), AC(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA; Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA), AD(Department of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; University of California Observatories - Lick Observatory, University of California, Santa Cruz, CA 95064, USA), AE(University of Arizona/Steward Observatory, 933 N Cherry Avenue, Tucson, AZ 85721, USA)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 391, Issue 1, pp. L39-L43. (MNRAS Homepage)
Publication Date:
11/2008
Origin:
MNRAS
MNRAS Keywords:
galaxies: active, quasars: absorption lines, quasars: general, quasars: individual: J105400.40+034801.2
DOI:
10.1111/j.1745-3933.2008.00554.x
Bibliographic Code:
2008MNRAS.391L..39H

Abstract

We report the first discovery of the emergence of a high-velocity broad-line outflow in a luminous quasar, J105400.40+034801.2, at redshift z ~ 2.1. The outflow is evident in ultraviolet CIV and SiIV absorption lines with velocity shifts v ~ 26300 km s-1 and deblended widths FWHM ~4000 km s-1. These features are marginally strong and broad enough to be considered broad absorption lines (BALs), but their large velocities exclude them from the standard BAL definition. The outflow lines appeared between two observations in the years 2002.18 and 2006.96. A third observation in 2008.48 showed the lines becoming ~40 per cent weaker and 10 to 15 per cent narrower. There is no evidence for acceleration or for any outflow gas at velocities <~23000 km s-1. The lines appear to be optically thick, with the absorber covering just 20 per cent of the quasar continuum source. This indicates a characteristic absorber size of ~4 × 1015 cm, but with a BAL-like total column density logNH(cm-2) >~ 21.2 and average space density nH >~ 2 × 105 cm-3. We attribute the emergence of the outflow lines to a substantial flow structure moving across our line of sight, possibly near the ragged edge of the main BAL flow or possibly related to the onset of a BAL evolutionary phase.
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