Abstract
The Type I Seyfert galaxy Markarian 509 was observed with Suzaku in 2010 November, for a gross time span of 2.2 days. The timing and spectral properties of the 0.5-45 keV X-rays, detected with the XIS and HXD, consistently revealed the presence of a soft spectral component that remained constant while the total X-ray intensity varied by ±10%. This stable soft component, found in the 0.5-3.0 keV range, was interpreted as being a result of thermal Comptonization in a coronawith a temperature of ∼0.5 keV and an optical depth of ∼18. The time-avearged 0.5-45 keV Suzaku spectrum was reproduced successfully, as a combination of this thermal Comptonization component, a harder power-law of photon index ∼1.8, moderate reflection, and an iron K-emission line. By analyzing four archival Suzaku datasets of the same object obtained in 2006, the thermal Comptonization component, which was stable during 2.2-day pointing in 2010, was found to vary on time scales of a few weeks, independently of the power-law component. Implications of these results are discussed in terms of a "multi-zone Comptonization" view, obtained with Suzaku from the black-hole binary Cygnus X-1.
Original language | English |
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Pages (from-to) | S925-S936 |
Journal | Publications of the Astronomical Society of Japan |
Volume | 63 |
Issue number | SPEC. ISSUE 3 |
DOIs | |
Publication status | Published - 2011 Nov 25 |
Externally published | Yes |
Keywords
- Galaxies: Active
- Galaxies: Individual (Mrk 509)
- Galaxies: Seyfert
- X-rays: Galaxies
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science