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Date and Time of the Query: 2019-08-17 T09:23:22 PDT
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For refcode 2013ApJ...771..100N:
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2013ApJ...771..100N A Suzaku Discovery of a Slowly Varying Hard X-Ray Continuum from the Type I Seyfert Galaxy NGC 3516 Noda, Hirofumi; Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya Abstract. The bright type I Seyfert galaxy NGC 3516 was observed by Suzaku twice, in 2005 October 12-15 and 2009 October 28-November 2, for a gross time coverage of 242 and 544 ks and a net exposure of 134 and 255 ks, respectively. The 2-10 keV luminosity was 2.8 x 10^41^ erg s^--1^ in 2005 and 1.6 x 10^41^ erg s^--1^ in 2009. The 1.4-1.7 keV and 1.7-10 keV count rates both exhibited peak-to-peak variations of a factor of ~2 in 2005 and ~4 in 2009. In both observations, the 15-45 keV count rate was less variable. The 2-10 keV spectrum in 2005 was significantly more convex than that in 2009. Through a count-count plot technique, the 2-45 keV signals in both sets of data were successfully decomposed in a model-independent way into two distinct broadband components. One is a variable emission with a featureless spectral shape, and the other is a non-varying hard component accompanied by a prominent Fe-K emission line at 6.33 keV (6.40 keV in the rest frame). The former was successfully fitted by an absorbed power-law model, while the latter requires a new hard continuum in addition to a reflection component from distant materials. The spectral and variability differences between the two observations are mainly attributed to long-term changes of this new hard continuum, which was stable on timescales of several hundreds of kiloseconds. Key words: galaxies: active, galaxies: individual: NGC 3516, galaxies: Seyfert, X-rays: galaxies
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