Discovery of a 272 second periodic variation in the X-ray source GX 304-1

McClintock, J. E.; Nugent, J. J.; Li, F. K.; Rappaport, S.

doi:10.1086/182499

Cited by 44 publications

(29 citation statements)

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“…Such a sharp dip in pulse profile is also seen in several other sources; GX 304-1 (e.g. McClintock et al 1977), 4U 1626-67 (e.g. Kii et al 1986), A0535+262 (e.g.…”

Section: Introductionsupporting

confidence: 56%

A Suzaku View of Accretion-powered X-Ray Pulsar GX 1+4

Yoshida

Kitamoto

Suzuki

et al. 2017

ApJ

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We present results obtained from a Suzaku observation of the accretion powered X-ray pulsar GX 1+4. Broad-band continuum spectrum of the pulsar was found to be better described by a simple model consisting of a blackbody component and an exponential cutoff power-law than the previously used compTT continuum model. Though the pulse profile had a sharp dip in soft X-rays (<10 keV), phaseresolved spectroscopy confirmed that the dimming was not due to increase in photoelectric absorption. Phase-sliced spectral analysis showed the presence of a significant spectral modulation beyond 10 keV except for the dip phase. A search for the presence of cyclotron resonance scattering feature in the Suzaku spectra yielded a negative result. Iron K-shell (K α and K β ) emission lines from nearly neutral iron ions (

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“…Such a sharp dip in pulse profile is also seen in several other sources; GX 304-1 (e.g. McClintock et al 1977), 4U 1626-67 (e.g. Kii et al 1986), A0535+262 (e.g.…”

Section: Introductionsupporting

confidence: 56%

A Suzaku View of Accretion-powered X-Ray Pulsar GX 1+4

Yoshida

Kitamoto

Suzuki

et al. 2017

ApJ

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“…A pulsar nature of the source was established with the detection of ∼ 272 s pulsations (Huckle et al, 1977;McClintock et al, 1977). Later a long-term study with the Vela 5B satellite revealed a 132.5-day periodicity of flaring events (Priedhorsky and Terrell, 1983), attributable to the binary period.…”

Section: Discussionmentioning

confidence: 95%

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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“…No Doppler variation is seen in the pulse period, ruling out a short orbital period (P > 18 d;McClintock et al, 1977).…”

Section: Observationsmentioning

confidence: 92%

“…The disk rim must therefore be continually resupplied at the appropriate tilt and phase . Merritt and Petterson (1980) overcame the time-scale problem by showing that a viscously coupled disk could precess as a unit, with a period corresponding to the (larger) forced precission period at some interior radius. However, the outer boundary condition, which establishes the tilted outer edge in the first place, is unexplained in their model.…”

Section: \ M2 /mentioning

confidence: 99%

Long-term cycles in cosmic X-ray sources

Priedhorsky

Holt

1987

Space Sci Rev

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Most of what we know about galactic X-ray binaries comes from their time variation, particularly periodic variations corresponding to neutron star rotation, and binary motion. Longer cycles or quasi-cycles are much harder to observe because of the shortage of instrumentation suitable for long-term monitoring. Nonetheless, cycle with periods up to a few years have been seen in several galactic binaries.Cycles of ~ 30-300 days have been confirmed for four high-mass systems, LMC X-4, Her X-l, SS433, and Cyg X-l, and are suspected in several others. These cycles are observed in both the X-ray and optical bands, and represent cyclic variations in both the inner and outer parts of the accretion disk. Some component of these systems is precessing, but we are not certain which. It could be a misaligned companion star; the outer rim of the accretion disk, driven by radiative feedback; or the neutron star.Several low-mass X-ray binaries have quasi-periodic cycles, with periods ranging from 89 to 2 years. The amplitude of modulation ranges between ~ 50 and 100 ~o, i.e., both 'persistent' and 'transient' objects fall into this class. This activity is reminiscent of the superoutburst cycles of the SU UMa cataclysmic variables, and may be caused by similar mass-transfer instabilities.Periodic outbursts in the Be/neutron star systems seem to result from variable mass transfer in a wide, eccentric orbit. The relationship between the orbital cycle and the flux outbursts, however, is not well understood, and even the equivalence of the outburst and binary cycles remains hypothetical for most objects. Most likely, the periodic outbursts result from enhanced mass transfer at periastron.Compared to other aspects of X-ray astronomy, long-term activity has been much less intensively studied by both observers and theoreticians. A simple all-sky monitor in permanent operation could provide for the X-ray sky the same kind of data base provided to optical observers by the Harvard plates.

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Discovery of a 272 second periodic variation in the X-ray source GX 304-1

Cited by 44 publications

References 0 publications

A Suzaku View of Accretion-powered X-Ray Pulsar GX 1+4

A Suzaku View of Accretion-powered X-Ray Pulsar GX 1+4

High-mass X-ray binaries in the Milky Way

Long-term cycles in cosmic X-ray sources

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