Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..493o&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 493 - 494
Astronomy and Astrophysics
Astrophysics
1
X Rays: Seyfert Galaxies, X Rays: Quasars
Scientific paper
The authors present the results of ASCA observations of the warm absorber in five Seyfert-1 galaxies and one quasar. The most important result is the detection of the continuous increase in O VIII absorption depth in MCG -6-30-15 within half a day with the continuum decrease. If this change is due to the recombination of O IX ions, the density and radius for increased O VIII ions should be n ⪆ 106cm-3 and R ⪉ 1017cm, respectively. It is also shown that the filling factor of the matter should be very small, implying that the warm absorber is probably clumpy. These results suggest this warm absorber as some link to the broad line region (BLR). On the other hand, no significant change in O VII was observed in MCG -6-30-15. These results are explained by two distinct warm absorbers in the line-of-sight unless some unknown reason causes the stability of O VII near the BLR; one of them corresponding to O VIII is located near the BLR, and another corresponding to O VII is located far outside from the BLR.
Fabian Andrea C.
Inoue Hajime
Iwasawa Kashuzi
Kii Tsuneo
Matsuoka Masaru
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