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Red Parkes-Quasars: Evidence for Soft X-ray Absorption | | Frank J. Masci
; Michael J. Drinkwater
; Rachel L. Webster
; | | Date: |
25 Aug 1998 | | Subject: | astro-ph | | Abstract: | The Parkes Half-Jansky Flat Spectrum Sample contains a large number of sources with unusually red optical-to-near-infrared 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 {it ROSAT} All-Sky Survey provided by Siebert et al. (1998). Significant ($>3sigma$ confidence level) correlations between optical (and near-infrared)--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 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 ($0< A_{V}< 6$ magnitudes) implied by the observed optical reddening. Excess X-ray absorption by warm (ionised) gas, (ie. a `warm absorber’) is not required. | | Source: | arXiv, astro-ph/9808286 | | Services: | Forum | Review | PDF | Favorites | |
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