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X-ray absorption and re-emission from an ionized outflow in the Type I quasi-stellar object 2MASS 234449+1221 observed by XMM-Newton

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journal contribution
posted on 2006-11-02, 17:35 authored by Kenneth A. Pounds, B.J. Wilkes, Kim L. Page
We report on the analysis of a short XMM–Newton observation of the reddened Type 1 quasistellar object (QSO) 2MASS 234449+1221 first identified in the Two-Micron All-Sky Survey (2MASS). The underlying X-ray continuum is found to be typical of a broad-line active galaxy, with photon index Γ ∼ 1.9. Low-energy absorption can be modelled by a column NH ∼ 10²² cm−² of moderately ionized gas or a smaller column of cold gas. Addition of a soft X-ray emission component significantly improves the fit in both cases. With the assumption that the soft X-ray flux represents emission from gas photoionized by the incident X-ray continuum, a comparison of the absorbed and emitted luminosities indicates a covering factor of ∼8–17 per cent. The unusual opportunity simultaneously to observe and quantify ionized absorption and emission in 2MASS 234449+1221 is due to the relatively large opacity – for a Type 1 active galactic nucleus (AGN) – of the absorbing gas, which depresses the normally strong continuum below ∼1 keV. A comparison of the soft X-ray emission of 2MASS 234449+1221 with that of other Type 1 and Type 2AGNs suggests the existence of an inner turbulent extension to ionized outflows, not detected in current high-resolution X-ray spectra.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2005, 362(3), pp.784-788.

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Blackwell

issn

0035-8711

eissn

1365-2966

Copyright date

2005

Available date

2006-11-02

Publisher version

http://www.wiley.com/bw/journal.asp?ref=0035-8711

Notes

The definitive version is available at www.blackwell-synergy.com.

Language

en

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