The X-ray light curve of 4U 2129+47

Ulmer, M. P.; Shulman, S.; Yentis, D.; Evans, W. D.; McNutt, D. P.; Meekins, J. F.; Wood, K. S.; Byram, E. T.; Chubb, T. A.; Friedman, H.

doi:10.1086/183181

Cited by 8 publications

(5 citation statements)

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“…The central question concerning the origin of this soft gamma ray emission is whether it is primarily diffuse or if it is greatly affected by one or more compact sources. There are 2 candidate hard X-ray point sources, the eclipsing LMXB 4U 2129+47 located at l = 91.58 • , b = −3.04 • (Thorstensen et al 1979;Ulmer et al 1980;Garcia 1994) and the X-ray pulsar Cep X-4 at l = 99.08 • , b = 3.78 • (Ulmer et al 1973;Koyama et al 1991). As can be seen from Figure 1 the detectors were more sensitive to both of these sources during viewing period 519.…”

Section: Origins and Implicationsmentioning

confidence: 93%

OSSE Observations of the Soft Gamma-Ray Continuum from the Galactic Plane at Longitude 95°

Skibo

Johnson

Kurfess

et al. 1997

The Astrophysical Journal

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We present the results of OSSE observations of the soft gamma ray continuum emission from the Galactic plane at longitude 95 • . Emission is detected between 50 and 600 keV where the spectrum is fit well by a power law with photon index −2.6 ± 0.3 and flux (4.0 ± 0.5) × 10 −2 photons s −1 cm −2 rad −1 MeV −1 at 100 keV. This spectral shape in this range is similar to that found for the continuum emission from the inner Galaxy but the amplitude is lower by a factor of four. This emission is either due to unresolved and previously unknown point sources or it is of diffuse origin, or a combination of the two. Simultaneous observations with OSSE and smaller field of view instruments operating in the soft gamma ray energy band, such as XTE or SAX, would help resolve this issue. If it is primarily diffuse emission due to nonthermal electron bremsstrahlung, as is the > 1 MeV Galactic ridge continuum, then the power in low energy cosmic ray electrons exceeds that of the nuclear component of the cosmic rays by an order of magnitude. This would have profound implications for the origin of cosmic rays and the energetics of the interstellar medium. Alternatively, if the emission is diffuse and thermal, then there must be a component of the interstellar medium at temperatures ∼ 10 9 K.

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Section: Origins and Implicationsmentioning

confidence: 93%

OSSE Observations of the Soft Gamma-Ray Continuum from the Galactic Plane at Longitude 95°

Skibo

Johnson

Kurfess

et al. 1997

The Astrophysical Journal

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“…4U 2129+47 was discovered in 1972 (Giaconni et al 1972;Gursky et al 1972) and, for a decade, it was seen by every X-ray instrument which pointed at it (e.g., Markert et al 1979;Thorstensen et al 1979;Ulmer et al 1980;Brinkman et al 1980;Warwick et al 1981;Amnuel et al 1982;Wood et al 1984;Garcia 1994). In 1983 EXOSAT failed to detect it (Pietsch et al 1983(Pietsch et al , 1986 adding 4U 2129+47 to the class of quasi-persistent X-ray transients.…”

Section: U 2129+47mentioning

confidence: 99%

Cooling of Accretion-Heated Neutron Stars

2017

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We present a brief, observational review about the study of the cooling behaviour of accretion-heated neutron stars and the inferences about the neutron-star crust and core that have been obtained from these studies. Accretion of matter during outbursts can heat the crust out of thermal equilibrium with the core and after the accretion episodes are over, the crust will cool down until crust-core equilibrium is restored. We discuss the observed properties of the crust cooling sources and what has been learned about the physics of neutron-star crusts. We also briefly discuss those systems that have been observed long after their outbursts were over, i.e, during times when the crust and core are expected to be in thermal equilibrium. The surface temperature is then a direct probe for the core temperature. By comparing the expected temperatures based on estimates of the accretion history of the targets with the observed ones, the physics of neutron-star cores can be investigated. Finally, we discuss similar studies performed for strongly magnetized neutron stars in which the magnetic field might play an important role in the heating and cooling of the neutron stars.Comment: Has appeared in Journal of Astrophysics and Astronomy special issue on 'Physics of Neutron Stars and Related Objects', celebrating the 75th birth-year of G. Srinivasan. In case of missing sources and/or references in the tables, please contact the first author and they will be included in updated versions of this revie

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“…Pos. (o < 1"): [128]; ADC: [1701]; total eclipses: [1153]; X-ray bursts: [465]; low state: [1240]; X-ray in quiescence: [463,464,1153]; X-ray orbital variations: [1592,1701]; opt. phm./UV sp.…”

Section: Conclusion and Remarksmentioning

confidence: 99%

A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)

Liu

Paradijs

Heuvel

2007

A&A

379

366

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We present a new edition of the catalogue of the low-mass X-ray binaries in the Galaxy and the Magellanic Clouds. The catalogue contains source name(s), coordinates, finding chart, X-ray luminosity, system parameters, and stellar parameters of the components and other characteristic properties of 187 low-mass X-ray binaries, together with a comprehensive selection of the relevant literature. The aim of this catalogue is to provide the reader with some basic information on the X-ray sources and their counterparts in other wavelength ranges (γ-rays, UV, optical, IR, and radio). Some sources, however, are only tentatively identified as low-mass X-ray binaries on the basis of their X-ray properties similar to the known low-mass X-ray binaries. Further identification in other wavelength bands is needed to finally determine the nature of these sources. In cases where there is some doubt about the low-mass nature of the X-ray binary this is mentioned. Literature published before 1 October 2006 has, as far as possible, been taken into account.

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The X-ray light curve of 4U 2129+47

Cited by 8 publications

References 0 publications

OSSE Observations of the Soft Gamma-Ray Continuum from the Galactic Plane at Longitude 95°

OSSE Observations of the Soft Gamma-Ray Continuum from the Galactic Plane at Longitude 95°

Cooling of Accretion-Heated Neutron Stars

A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)

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