Suzaku and XMM-Newton view of Mrk 110 and Ark 564
Abstract
We report on the timing and spectral analysis of Suzaku observations of two Narrow Line Seyfert 1 sources, Ark 564 and Mrk 110 and XMM-Newton observation of Mrk 1040. For Mrk 110 and Ark 564 we have also analyzed the corresponding XMM-Newton observations for comparison. We find that a double Comptonization model explains the soft excess and the high energy continuum for both sources. The spectra of these two AGN seem to be analogous to the hard and soft states observed in Galactic Black hole binaries. The analogy is further strengthened by the Eddington ratio (in the 0.7-40 keV band) which is ∼0.03 for Mrk 110, similar to that of black holes binaries in the hard state, while for Ark 564 it is ∼0.2 consistent with that of the soft state. However, unlike the soft state of typical black hole binaries, Ark 564 is highly variable with rms increasing with energy. This suggests that the source is more like the soft state of Cygnus X-1, which is also highly variable, although there may be a difference in the bolometric Eddington ratio between the two. Mrk 110 shows significantly lower variability, which is expected due to the large black hole mass ∼10^8 M⊙ of the system. We have further investigated the multiple XMM-Newton observations of Ark 564 for the X-ray-optical correlation using data from Optical Monitor and EPIC PN instruments onboard XMM-Newton. We report the presence of soft time lags in the dominant variability timescale of 10^4 s and rms variability in the XMM-Newton observation of Mrk 1040.
- Publication:
-
Astronomical Society of India Conference Series
- Pub Date:
- 2013
- Bibcode:
- 2013ASInC...9R.133T