Strong X-Ray Absorption in a Broad Absorption Line Quasar: PHL 5200

Details Strong X-Ray Absorption in a Broad Absorption Line Quasar: PHL 5200 Strong X-Ray Absorption in a Broad Absorption Line Quasar: PHL 5200

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...455l...9m&link_type=abstract

Astrophysical Journal Letters v.455, p.L9

Astronomy and Astrophysics

Astronomy

60

Galaxies: Quasars: Individual Alphanumeric: Phl 5200, Galaxies: Quasars: Absorption Lines, X-Rays: Galaxies

Scientific paper

We present ASCA observations of the z = 1.98 prototype broad absorption line quasar (BALQSO): PHL 5200. The source was detected in both SIS and GIS. A power-law spectrum ( alpha E = 0.6^{+0.9}_{-0.6} ) with large intrinsic absorption (NH = 1.3^{+2.3}_{-1.1} x 1023 cm-2) best describes the spectrum. Excess column density over the local Galactic value is required at the 99% confidence level. This detection suggests that, although BALQSOs are X-ray--quiet, it is strong absorption in the BAL region that makes them appear faint to low-energy X-ray experiments. The required intrinsic absorbing column density is 2--3 orders of magnitude larger than earlier estimates of column densities in BALQSOs. This implies that the BAL systems are much more highly ionized than was previously thought.

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