Abstract
Context. 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. Aims. 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. Methods. The Suzaku spectrum was analyzed, and the results compared with previous ASCA and XMM-Newton observations. Results. 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.
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