SIMBAD references

2009A&A...496..653M - Astronomy and Astrophysics, volume 496, 653-658 (2009/3-4)

Suzaku observation of the Phoenix galaxy.

MATT G., BIANCHI S., AWAKI H., COMASTRI A., GUAINAZZI M., IWASAWA K., JIMENEZ-BAILON E. and NICASTRO F.

Abstract (from CDS):

In recent years, several Seyfert 2 galaxies have been discovered that change state when observed in X-rays a few years apart, switching from Compton-thin to reflection-dominated or viceversa. We observed a member of this class of ``Changing-look'' sources, the Phoenix galaxy, with Suzaku, with the aim of better understanding the nature of the variations. The Suzaku spectrum was analyzed, and the results compared with previous ASCA and XMM-Newton observations. The source was caught in a Compton-thin state, as in XMM-Newton, but differently from ASCA. Comparing the Suzaku and XMM-Newton observations, a variation in the column density of the absorber on a time scale of years is discovered. A similar change, but on much shorter time scales (i.e. ks) may also explain the count-rate variations during the Suzaku observations. A soft excess is also present, likely due to continuum and line emission from photoionized circumnuclear matter.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: individual: Phoenix - X-rays: galaxies

Simbad objects: 6

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2019.10.20-12:09:28

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