SIMBAD references

2013ApJ...773..130T - Astrophys. J., 773, 130 (2013/August-3)

Spectral variability of IRAS 18325-5926 and constraints on the geometry of the scattering medium.

TRIPATHI S., MISRA R., DEWANGAN G.C., CHEERAN J., ABRAHAM S. and PHILIP N.S.

Abstract (from CDS):

We analyze Suzaku and XMM-Newton data of the highly variable Seyfert 2, IRAS 18325-5926. The spectra of the source are well modeled as a primary component described as an absorbed power law and a secondary power-law component which is consistent with being scattered emission from an on-axis extended highly ionized medium. We show that while the primary component varies on a wide range of timescales from 104-108 s, the scattered emission is variable only on timescales longer than 105 s. This implies that the extent of the scattering medium is greater than 1016 cm. The ratio of the scattered to primary flux (∼0.03) implies a column density for the scattering medium to be ∼1023/cm2. We argue that for such a medium to be highly ionized it must be located less than 1017 cm from the X-ray source. Thus, we localize the position and extent of scattering region to be ∼a fewx1016 cm, with an average particle density of ∼106/cm3. We consider the physical interpretation of these results, and as an aside we confirm the presence of a broad iron line emission in both the XMM-Newton and Suzaku observations.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - scattering

Simbad objects: 7

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