Suzaku observations of the extreme mev blazar swift J0746.3+2548

Shin Watanabe*, Rie Sato, Tadayuki Takahashi, Jun Kataoka, Greg Madejski, Marek Sikora, Fabrizio Tavecchio, Rita Sambruna, Roger Romani, Philip G. Edwards, Tapio Pursimo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We report the Suzaku observations of the high luminosity blazar SWIFT J0746.3+2548 (J0746) conducted in 2005 November. This object, which, with z = 2.979, is the highest redshift source observed in the Suzaku Guaranteed Time Observer period, is likely to show high gamma-ray flux peaking in the MeV range. As a result of the good photon statistics and high signal-to-noise ratio spectrum, the Suzaku observation clearly confirms that J0746 has an extremely hard spectrum in the energy range of 0.3-24 keV, which is well represented by a single power-law with a photon index of Γph ≃ 1.17 and Galactic absorption. The multiwavelength spectral energy distribution of J0746 shows two continuum components, and is well modeled assuming that the high-energy spectral component results from Comptonization of the broad-line region photons. In this paper, we search for the bulk Compton spectral features predicted to be produced in the soft X-ray band by scattering external optical/UV photons by cold electrons in a relativistic jet. We discuss and provide constraints on the pair content resulting from the apparent absence of such features.

Original languageEnglish
Pages (from-to)294-301
Number of pages8
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 2009
Externally publishedYes


  • Galaxies: active
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Suzaku observations of the extreme mev blazar swift J0746.3+2548'. Together they form a unique fingerprint.

Cite this