Firm detection of a cyclotron resonance feature with Suzaku in the X-ray spectrum of GRO J1008-57 during a giant outburst in 2012
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Abstract
<jats:title>Abstract</jats:title> <jats:p>We report on the firm detection of a cyclotron resonance scattering feature (CRSF) in the X-ray spectrum of the Be X-ray binary pulsar, GRO J1008−57, achieved by the Suzaku Hard X-ray Detector during a giant outburst which was detected by the MAXI Gas Slit Camera in 2012 November. The Suzaku observation was carried out on 2012 November 20, outburst maximum when the X-ray flux reached ∼ 0.45 Crab in 4–10 keV, which corresponds to a luminosity of 1.1 × 1038 erg s−1 in 0.5–100 keV at 5.8 kpc. The obtained broadband X-ray spectrum from 0.5 keV to 118 keV revealed a significant absorption feature, considered as the fundamental CRSF, at ∼ 76 keV. This unambiguously reconfirms the previously suggested ∼ 80 keV spectral feature in GRO J1008−57. The implied surface magnetic field, 6.6 × 1012 G, is the highest among binary X-ray pulsars from which CRSFs have ever been detected.</jats:p>
Journal
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- Publications of the Astronomical Society of Japan
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Publications of the Astronomical Society of Japan 66 (3), 59-, 2014
Tokyo : Astronomical Society of Japan
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Details 詳細情報について
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- CRID
- 1523669555675785984
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- NII Article ID
- 40020140487
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- NII Book ID
- AA1082896X
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- ISSN
- 00046264
- 2053051X
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- NDL BIB ID
- 025616989
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- Text Lang
- en
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- NDL Source Classification
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- ZM33(科学技術--宇宙科学)
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- Data Source
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- NDL
- Crossref
- CiNii Articles
- KAKEN
