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A unique X-ray unabsorbed Seyfert 2 galaxy IRAS F01475-0740 | | Huang Xing-Xing
; Wang Jun-Xian
; Tan Ying
; Yang Huan
; Huang Ya-Fang
; | | Date: |
12 May 2011 | | Abstract: | X-ray unabsorbed Seyfert 2 galaxies appear to have X-ray absorption column
densities that are too low (NH < 10^22 cm-2) to explain the absence of broad
emission lines in their optical spectra, challenging the standard AGN
unification model. In this paper we report Suzaku exposure on the X-ray
unabsorbed Seyfert 2 galaxy IRAS F01475-0740, in which a hidden broad line
region was detected through spectropolarimetric observation. The X-ray data
show rapid and significant variations on time scales down to 5 ks, indicating
that we are viewing its central engine directly. A newly obtained optical
spectrum and previous optical/X-ray data suggest that state transition is
unlikely in this source. These make IRAS F01475-0740 a very peculiar X-ray
unabsorbed Seyfert 2 galaxy which can only be explained by absorption from
materials with abnormally high dust-to-gas ratio (by a factor of > 4 larger
than Galactic). This is in contrast to most AGNs, which typically show
dust-to-gas ratios 3 - 100 times lower than the Galactic. | | Source: | arXiv, 1105.2448 | | Services: | Forum | Review | PDF | Favorites | |
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