O VIII resonant absorption in PKS 2155 - 304 - A hot wind

Details O VIII resonant absorption in PKS 2155 - 304 - A hot wind O VIII resonant absorption in PKS 2155 - 304 - A hot wind

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..104k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 1, 1985, p. 104-108. Research supported by the University of Cali

Astronomy and Astrophysics

Astrophysics

36

Absorption Spectra, Bl Lacertae Objects, Stellar Winds, X Ray Spectra, Gas Ionization, Mass Flow, Oxygen, Photoionization, Ultraviolet Spectra

Scientific paper

The broad X-ray absorption feature in PKS 2155 - 304 could be due to O VIII Ly-alpha resonant absorption in a wind with outflow speeds up to about 30,000 km/s. The properties of such a wind are calculated. A homogeneous, spherically symmetric wind would involve a mass flux of about a 1000 solar masses/year, but this estimate could be greatly reduced if the outflow were beamed, and/or the absorbing gas were clumped into small clouds. In the latter case, the O VIII absorption offers clues to the physical state of thermal material closer to the central energy source than the clouds which produce optical emission lines in quasars.

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