Suzaku studies of wide-band spectral variability of the bright type i Seyfert galaxy Markarian 509

Hirofumi Noda, Kazuo Makishima, Shin'Ya Yamada, Shunsuke Torii, Soki Sakurai, Kazuhiro Nakazawa

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


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 languageEnglish
Pages (from-to)S925-S936
JournalPublications of the Astronomical Society of Japan
Issue numberSPEC. ISSUE 3
Publication statusPublished - 2011 Nov 25
Externally publishedYes


  • Galaxies: Active
  • Galaxies: Individual (Mrk 509)
  • Galaxies: Seyfert
  • X-rays: Galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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