Red Parkes quasars: Evidence for soft X-ray absorption

Masci, F. J., Drinkwater, M. J. and Webster, R. L. (1999) Red Parkes quasars: Evidence for soft X-ray absorption. Astrophysical Journal, 510 2: 703-709. doi:10.1086/306611

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Author Masci, F. J.
Drinkwater, M. J.
Webster, R. L.
Title Red Parkes quasars: Evidence for soft X-ray absorption
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
Publication date 1999-01-10
Year available 1999
Sub-type Article (original research)
DOI 10.1086/306611
Open Access Status File (Publisher version)
Volume 510
Issue 2
Start page 703
End page 709
Total pages 7
Place of publication Philadelphia, PA, United States
Publisher University of Chicago Press
Language eng
Abstract The Parkes Half-Jansky Flat-Spectrum Sample contains a large number of sources with unusually red optical-to-near-infrared (NIR) continua. If this is to be interpreted as extinction by dust in the line of sight, then associated material might also give rise to absorption in the soft X-ray regime. This hypothesis is tested using broadband (0.1-2.4 keV) data from the ROSAT All-Sky Survey. Significant (>3 sigma confidence level) correlations between the optical (and NIR)-to-soft X-ray continuum slope and optical extinction are found in the data, consistent with absorption by material with metallicity and a range in the gas-to-dust ratio as observed in the local ISM. Under this simple model, the soft X-rays are absorbed at a level consistent with the range of extinctions (0 < A(V) < 6 mag) implied by the observed optical reddening. Excess X-ray absorption by warm (ionized) gas, (i.e., a warm absorber) is not required by the data.
Keyword Astronomy & Astrophysics
Dust, Extinction
Magellanic Cloud
Optically Quiet
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 13 Aug 2007, 20:55:40 EST