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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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
Volume694
Issue number1
DOIs
Publication statusPublished - 2009
Externally publishedYes

Fingerprint

photons
energy
signal-to-noise ratio
power law
spectral energy distribution
scattering
electron
signal to noise ratios
luminosity
statistics
gamma rays
continuums
electrons
x rays
distribution
cold
index

Keywords

  • Galaxies: active
  • X-rays: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Watanabe, S., Sato, R., Takahashi, T., Kataoka, J., Madejski, G., Sikora, M., ... Pursimo, T. (2009). Suzaku observations of the extreme mev blazar swift J0746.3+2548. Astrophysical Journal, 694(1), 294-301. https://doi.org/10.1088/0004-637X/694/1/294

Suzaku observations of the extreme mev blazar swift J0746.3+2548. / Watanabe, Shin; Sato, Rie; Takahashi, Tadayuki; Kataoka, Jun; Madejski, Greg; Sikora, Marek; Tavecchio, Fabrizio; Sambruna, Rita; Romani, Roger; Edwards, Philip G.; Pursimo, Tapio.

In: Astrophysical Journal, Vol. 694, No. 1, 2009, p. 294-301.

Research output: Contribution to journalArticle

Watanabe, S, Sato, R, Takahashi, T, Kataoka, J, Madejski, G, Sikora, M, Tavecchio, F, Sambruna, R, Romani, R, Edwards, PG & Pursimo, T 2009, 'Suzaku observations of the extreme mev blazar swift J0746.3+2548', Astrophysical Journal, vol. 694, no. 1, pp. 294-301. https://doi.org/10.1088/0004-637X/694/1/294
Watanabe, Shin ; Sato, Rie ; Takahashi, Tadayuki ; Kataoka, Jun ; Madejski, Greg ; Sikora, Marek ; Tavecchio, Fabrizio ; Sambruna, Rita ; Romani, Roger ; Edwards, Philip G. ; Pursimo, Tapio. / Suzaku observations of the extreme mev blazar swift J0746.3+2548. In: Astrophysical Journal. 2009 ; Vol. 694, No. 1. pp. 294-301.
@article{15394706187c42c3b36029350ff89b96,
title = "Suzaku observations of the extreme mev blazar swift J0746.3+2548",
abstract = "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.",
keywords = "Galaxies: active, X-rays: galaxies",
author = "Shin Watanabe and Rie Sato and Tadayuki Takahashi and Jun Kataoka and Greg Madejski and Marek Sikora and Fabrizio Tavecchio and Rita Sambruna and Roger Romani and Edwards, {Philip G.} and Tapio Pursimo",
year = "2009",
doi = "10.1088/0004-637X/694/1/294",
language = "English",
volume = "694",
pages = "294--301",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Suzaku observations of the extreme mev blazar swift J0746.3+2548

AU - Watanabe, Shin

AU - Sato, Rie

AU - Takahashi, Tadayuki

AU - Kataoka, Jun

AU - Madejski, Greg

AU - Sikora, Marek

AU - Tavecchio, Fabrizio

AU - Sambruna, Rita

AU - Romani, Roger

AU - Edwards, Philip G.

AU - Pursimo, Tapio

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

KW - Galaxies: active

KW - X-rays: galaxies

UR - http://www.scopus.com/inward/record.url?scp=68049148464&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=68049148464&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/694/1/294

DO - 10.1088/0004-637X/694/1/294

M3 - Article

VL - 694

SP - 294

EP - 301

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -