Multi-epoch observations of extremely high-velocity emergent broad absorption

Jesse A. Rogerson, Patrick B. Hall, Paola Rodríguez Hidalgo, Patrik Pirkola, William N. Brandt, Nur Filiz Ak

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Abstract

We present the discovery of the highest velocity C IV broad absorption line to date in the z = 2.47 quasar SDSS J023011.28+005913.6, hereafter J0230. In comparing the public DR7 and DR9 spectra of J0230, we discovered an emerging broad absorption trough outflowing at ~60 000 km s-1,which we refer to as trough A. In pursuing followup observations of trough A, we discovered a second emergent CIV broad absorption trough outflowing at ~40 000 km s-1, namely trough B. In total, we collected seven spectral epochs of J0230 that demonstrate emergent and rapidly (~10 d in the rest-frame) varying broad absorption. We investigate two possible scenarios that could cause these rapid changes: bulk motion and ionization variability. Given our multi-epoch data, we were able to rule out some simple models of bulk motion, but have proposed twomore realistic models to explain the variability of both troughs. Trough A is likely an augmented 'crossing disc' scenario with the absorber moving at 10 000 < v(km s-1) < 18 000. Trough B can be explained by a flow-tube feature travelling across the emitting region at 8000 < v(km s-1) < 56 000. If ionization variability is the cause for the changes observed, trough A's absorber has ne ≥ 724 cm-3 and is at requal ≥ 2.00 kpc, or is at r < 2.00 kpc with no constraint on the density; trough B's absorber either has ne ≥ 1540 cm-3 and is at requal ≥ 1.37 kpc, or is at r < 1.37 kpc with no constraint on the density.

Original languageEnglish (US)
Pages (from-to)405-420
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume457
Issue number1
DOIs
StatePublished - Jan 11 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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