High‐Energy Spectral and Temporal Characteristics of GRO J1008−57

Shrader, C. R.; Sutaria, Firoza; Singh, K. P.; Macomb, D. J.

doi:10.1086/306785

Cited by 39 publications

(65 citation statements)

References 15 publications

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“…Based on the Suzaku data Yamamoto et al (2013) discovered a cyclotron line in the source spectrum at Ecyc = 75.5 +2.5 −1.5 keV. This detection reconfirms the previously suggested spectral feature around ∼ 80 keV (Shrader et al, 1999).…”

Section: Discussionsupporting

confidence: 53%

“…Orbital parameters were determined using data from different observatories as follows: P orb = 249.46 ± 0.10 d, ax sin i = 530 ± 60 lt-s, ω = −26 ± 8 deg, e = 0.68 ± 0.02 (Levine and Corbet, 2006a;Coe et al, 2007;Kuehnel et al, 2012). The combined spectrum from the CGRO and ASCA observations can be well approximated by a power law with the high energy cutoff and a 6.4-keV iron emission line (Shrader et al, 1999). An approximation of the INTEGRAL data results in the following spectral parameters: photon index 1.4 ± 0.1, cut-off energy E cut = 8.0 ± 1.0 keV, exponential folding E f old = 21 ± 2 keV (Coe et al, 2007).…”

Section: Discussionmentioning

confidence: 92%

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High-mass X-ray binaries in the Milky Way

Walter

Lutovinov

Bozzo

et al. 2015

Astron Astrophys Rev

234

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High-mass X-ray binaries are fundamental in the study of stellar evolution, nucleosynthesis, structure and evolution of galaxies and accretion processes. Hard X-rays observations by INTEGRAL and Swift have broadened significantly our understanding in particular for the super-giant systems in the Milky Way, which number has increased by almost a factor of three. INTEGRAL played a crucial role in the discovery, study and understanding of heavily obscured systems and of fast X-ray transients. Most super-giant systems can now be classified in three categories: classical/obscured, eccentric and fast transient.The classical systems feature low eccentricity and variability factor of ∼ 10 3 , mostly driven by hydrodynamic phenomena occurring on scales larger than the accretion radius. Among them, systems with short orbital periods and close to Roche-Lobe overflow or with slow winds, appear highly obscured. In eccentric systems, the variability amplitude can reach even higher factors, because of the contrast of the wind density along the orbit. Four super-giant systems, featuring fast outbursts, very short orbital periods and anomalously low accretion rates, are not yet understood.Simulations of the accretion processes on relatively large scales have progressed and reproduce parts of the observations. The combined effects of wind

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 92%

High-mass X-ray binaries in the Milky Way

Walter

Lutovinov

Bozzo

et al. 2015

Astron Astrophys Rev

234

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“…Even if the 88 keV feature is the second harmonic cyclotron line, as argued by Shrader et al (1999), GRO J1008−57 would be one of the most strongly magnetized neutron stars in an accreting system to date.…”

Section: Introductionmentioning

confidence: 95%

“…Above 20 keV the spectrum can be well described by an exponentially cutoff power law (Grove et al 1995;Shrader et al 1999;Coe et al 2007). Below 20 keV, Suzaku observations show a complex spectrum with Fe line fluorescent emission and a power-law continuum (Naik et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…A slight deviation from the continuum at 88 keV in CGRO-OSSE observations was interpreted by Shrader et al (1999) as a possible cyclotron line feature, i.e., as a feature caused by inelastic scattering of photons off electrons quantized in the strong magnetic field at the neutron star's poles (Schönherr et al 2007;Caballero & Wilms 2012;Pottschmidt et al 2012, and references therein). Even if the 88 keV feature is the second harmonic cyclotron line, as argued by Shrader et al (1999), GRO J1008−57 would be one of the most strongly magnetized neutron stars in an accreting system to date.…”

Section: Introductionmentioning

confidence: 99%

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GRO J1008−57: an (almost) predictable transient X-ray binary

Kühnel

Müller

Kreykenbohm

et al. 2013

A&A

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A study of archival RXTE, Swift, and Suzaku pointed observations of the transient high-mass X-ray binary GRO J1008−57 is presented. A new orbital ephemeris based on pulse arrival-timing shows the times of maximum luminosities during outbursts of GRO J1008−57 to be close to periastron at orbital phase −0.03. This makes the source one of a few for which outburst dates can be predicted with very high precision. Spectra of the source in 2005, 2007, and 2011 can be well described by a simple power law with high-energy cutoff and an additional black body at lower energies. The photon index of the power law and the black-body flux only depend on the 15-50 keV source flux. No apparent hysteresis effects are seen. These correlations allow us to predict the evolution of the pulsar's X-ray spectral shape over all outbursts as a function of just one parameter, the source's flux. If modified by an additional soft component, this prediction even holds during GRO J1008−57's 2012 type II outburst.

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Magnetic Fields of Neutron Stars in X-Ray Binaries

Revnivtsev

Mereghetti

2016

Space Sciences Series of ISSI

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A substantial fraction of the known neutron stars resides in X-ray binaries -systems in which one compact object accretes matter from a companion star. Neutron stars in X-ray binaries have magnetic fields among the highest found in the Universe, spanning at least the range from ∼ 10 8 to several 10 13 G. The magnetospheres around these neutron stars have a strong influence on the accretion process, which powers most of their emission. The magnetic field intensity and geometry, are among the main factors responsible for the large variety of spectral and timing properties observed in the X-ray energy range, making these objects unique laboratories to study the matter behavior and the radiation processes in magnetic fields unaccessible on Earth. In this paper we review the main observational aspects related to the presence of magnetic fields in neutron star X-ray binaries and some methods that are used to estimate their strength.

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High‐Energy Spectral and Temporal Characteristics of GRO J1008−57

Cited by 39 publications

References 15 publications

High-mass X-ray binaries in the Milky Way

High-mass X-ray binaries in the Milky Way

GRO J1008−57: an (almost) predictable transient X-ray binary

Magnetic Fields of Neutron Stars in X-Ray Binaries

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