Strong X-ray Absorption in a BALQSO: PHL5200

Details Strong X-ray Absorption in a BALQSO: PHL5200 Strong X-ray Absorption in a BALQSO: PHL5200

1995-10-03

arxiv.org/abs/astro-ph/9510009v1

Astronomy and Astrophysics

Astrophysics

uuencoded compressed postscript file. Figure 1 not included. To appear in the Ap.J. Letters. Also available at http://hea-ww

Scientific paper

We present $\it {ASCA}$ observations of the z=1.98 prototype BALQSO: PHL5200. 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 (N$_H = 1.3^{+2.3}_{-1.1} \times 10^{23}$ 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 two to three orders of magnitude larger than earlier estimates of column densities in BALQSOs. This implies that the BAL systems are much more highly ionized than previously thought.

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