Cosmic X-ray Sources

Bowyer, S.; Byram, E. T.; Chubb, T. A.; Friedman, H.

doi:10.1126/science.147.3656.394

Cited by 290 publications

(149 citation statements)

References 5 publications

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“…This opens the possibility to constrain modified theories of gravity with rather local precision observations of astrophysical objects in the Galaxy. Cygnus X-1 was discovered at X-rays by Bowyer et al (1965). Early dynamical studies of the compact object suggested the presence of an accreting black hole (e.g.…”

Section: Discussionmentioning

confidence: 99%

Accretion disks around black holes in modified strong gravity

Pérez

Romero

Bergliaffa

2013

A&A

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Context. Stellar-mass black holes offer what is perhaps the best scenario to test theories of gravity in the strong-field regime. In particular, f (R) theories, which have been widely discus in a cosmological context, can be constrained through realistic astrophysical models of phenomena around black holes. Aims. We aim at building radiative models of thin accretion disks for both Schwarzschild and Kerr black holes in f (R) gravity. Methods. We study particle motion in f (R)-Schwarzschild and Kerr space-times.Results. We present the spectral energy distribution of the accretion disk around constant Ricci scalar f (R) black holes, and constrain specific f (R) prescriptions using features of these systems.Conclusions. A precise determination of both the spin and accretion rate onto black holes along with X-ray observations of their thermal spectrum might allow to identify deviations of gravity from general relativity. We use recent data on the high-mass X-ray binary Cygnus X-1 to restrict the values of the parameters of a class of f (R) models.

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Section: Discussionmentioning

confidence: 99%

Accretion disks around black holes in modified strong gravity

Pérez

Romero

Bergliaffa

2013

A&A

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“…A rocket borne X-ray detector, launched in 1964, discovered the persistently bright X-ray source Cygnus X-1 [35]. Its exact nature was not clear, however, until its optical identification with the O-type star HDE 226868 [36][37][38].…”

Section: The Identification Of Galactic Black Hole Candidates (Gbhcs)mentioning

confidence: 99%

Fluorescent iron lines as a probe of astrophysical black hole systems

2003

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“…In this work we investigate the spectral properties of the Galactic source GX 3+1 (Bowyer et al 1965), which is a bright, persistent accreting low mass x-ray binary (LMXB). A number of type I X-ray bursts, likely due to burning helium, has been detected, with decay timescales ranging from tens of seconds up to hours (e.g.…”

Section: Introductionmentioning

confidence: 99%

Study of the reflection spectrum of the accreting neutron star GX 3+1 using XMM–Newton and INTEGRAL

Pintore

Salvo

Bozzo

et al. 2015

Monthly Notices of the Royal Astronomical Society

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Broad emission features of abundant chemical elements, such as Iron, are commonly seen in the X-ray spectra of accreting compact objects and their studies can provide useful information about the geometry of the accretion processes. In this work, we focus our attention on GX 3+1, a bright, persistent accreting low mass X-ray binary, classified as an atoll source. Its spectrum is well described by an accretion disc plus a stable comptonizing, optically thick corona which dominates the X-ray emission in the 0.3-20 keV energy band. In addition, four broad emission lines are found and we associate them with reflection of hard photons from the inner regions of the accretion disc where doppler and relativistic effects are important. We used self-consistent reflection models to fit the spectra of the 2010 XMM-Newton observation and the stacking of the whole datasets of 2010 INTEGRAL observations. We conclude that the spectra are consistent with reflection produced at ∼ 10 gravitational radii by an accretion disc with an ionization parameter of ξ ∼ 600 erg cm s −1 and viewed under an inclination angle of the system of ∼ 35°. Furthermore, we detected for the first time for GX 3+1, the presence of a powerlaw component dominant at energies higher than 20 keV, possibly associated with an optically thin component of non-thermal electrons.

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Cosmic X-ray Sources

Abstract: Eight new sources of cosmic x-rays were detected by two Aerobee surveys in 1964. One source, from Sagittarius, is close to the galactic center, and the other, from Ophiuchus, may coincide with Kepler's 1604 supernova. All the x-ray sources are fairly close to the galactic plane.

Cited by 290 publications

References 5 publications

Accretion disks around black holes in modified strong gravity

Accretion disks around black holes in modified strong gravity

Fluorescent iron lines as a probe of astrophysical black hole systems

Study of the reflection spectrum of the accreting neutron star GX 3+1 using XMM–Newton and INTEGRAL

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