Evidence for ionized reprocessing in the X-ray spectrum of the Seyfert 1 Galaxy 1E1615+061

Details Evidence for ionized reprocessing in the X-ray spectrum of the Seyfert 1 Galaxy 1E1615+061 Evidence for ionized reprocessing in the X-ray spectrum of the Seyfert 1 Galaxy 1E1615+061

1998-09-02

arxiv.org/abs/astro-ph/9809013v1

Astronomy and Astrophysics

Astrophysics

9 pages, Latex, 6 Postscript figures, accepted for publication in Astronomy & Astrophysics

Scientific paper

The Seyfert 1 galaxy 1E1615+061 was observed to display a very steep and intense soft X-ray spectrum during a HEAO-1 A2 observation in the 1978. Such an exceptionally soft X-ray state has never been observed subsequently, but the source has continued to exhibit a large (up to a factor 6) range of X-ray intensity variability. The overall UV/X-ray spectrum of this source, observed during a multiwavelength campaign in 1991-1992, can be well fit with a self-consistent, low-m-dot accretion disk model. In this model, the soft X-rays result were suggested to arise from reflection of the nuclear emission by mildly ionized material in the inner regions of the disk. In this Paper we report the results of an ASCA observation in 1995 August, which give a direct confirmation of such a scenario. The spectrum may be modeled as a power-law with a photon index of 1.8, together with absorption consistent with the galactic line of sight value, substantial reflection from ionized material and an iron fluorescent K-alpha emission line. The centroid energy (~6.6--6.8 keV) implies a ionization stage >Fe XIX. The line profile is consistent with that expected from a kinematically and gravitationally distorted line around a black hole. These results provide the first direct evidence for the existence of considerable amount of ionized material around the nucleus of a "broad" Seyfert 1 galaxy.

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