20-100 keV properties of cataclysmic variables detected in the INTEGRAL/IBIS survey

Barlow, E. J.; Knigge, Christian; Bird, A. J.; Dean, Anthony J.; Clark, D. J.; Hill, A. B.; Molina, M.; Sguera, V.

doi:10.1111/j.1365-2966.2006.10836.x

Cited by 110 publications

(147 citation statements)

References 59 publications

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“…The only outlier is MU Cam where our temperature (and mass) is substantially greater. However, in a recent analysis of XMM-Newton and INTEGRAL data, Staude et al (2008) conclude that the estimate of Barlow et al (2006) seems too low. These authors attempted a combined XMM-INTEGRAL fit, and arrive at a temperature of 35 ± 10 keV, which they describe as "convincing agreement with the INTEGRAL data points".…”

Section: Discussion Of Individual Objectsmentioning

confidence: 99%

Intermediate polars in the Swift/BAT survey: spectra and white dwarf masses

Brunschweiger

Greiner

Ajello

et al. 2009

A&A

100

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Context. White dwarf masses in cataclysmic variables are difficult to determine accurately, but are fundamental for understanding binary system parameters, as well as binary evolution. Aims. We investigate the X-ray spectral properties of a sample of Intermediate Polars (IP) detected above 15 keV to derive the masses of their accreting white dwarfs. Methods. We use data from the Swift/BAT instrument which during the first 2.5 yrs of operation has detected 22 known intermediate polars. The X-ray spectra of these sources are used to estimate the mass of the white dwarfs. Results. We are able to produce a mass estimate for 22 out of 29 of the confirmed intermediate polars.Comparison with previous mass measurements shows good agreement. For GK Per, we were able to detect spectral changes due to the changes in the accretion rate. Conclusions. The Swift/BAT detector with its combination of sensitivity and all-sky coverage provides an ideal tool to determine accurate white dwarf masses in intermediate polars. This method should be applied to other magnetic white dwarf binaries.

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Section: Discussion Of Individual Objectsmentioning

confidence: 99%

Intermediate polars in the Swift/BAT survey: spectra and white dwarf masses

Brunschweiger

Greiner

Ajello

et al. 2009

A&A

100

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“…den Hartog et al 2006;Molkov et al 2004) and population types (Barlow et al 2006;Bassani et al 2007;Sazonov et al 2007;Beckmann et al 2006Beckmann et al , 2009.…”

Section: Introductionmentioning

confidence: 99%

The catalog of variable sources detected byINTEGRAL

Telezhinsky¹,

Eckert

Savchenko

et al. 2010

A&A

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Context. During its 6 years of operation, INTEGRAL/ISGRI has detected more than 500 sources. Many of these sources are variable. Taking into account that nearly half of INTEGRAL/ISGRI sources are new and many of them remain unidentified, the variability properties of the sources can provide additional constraints to help us to classify and identify the unknown sources. Aims. To study the variability properties of the sources detected by INTEGRAL/ISGRI, we develop a method to quantify the variability of a source. We describe here our techniques and compile a catalog of the sources that fit our criteria of variability. Methods. We use the natural time binning of INTEGRAL observations called Science Window (≈2000 s) and test the hypothesis that the detected sources are constant using a χ 2 all-sky map in three energy bands (20-40, 40-100, 100-200 keV). We calculate an intrinsic variance of the flux in individual pixels and use it to define the fractional variability of a source. The method is sensitive to the source variability on timescales of one Science Window and higher. We concentrate only on the sources that were already reported to be detected by INTEGRAL.Results. We present a catalog of 202 sources found to be significantly variable. For the catalog sources, we give the measure of variability and fluxes with corresponding errors in the 20-40, 40-100 and 100-200 keV energy bands, and we present some statistics about the population of variable sources. The description of the physical properties of the variable sources will be given in a forthcoming paper.

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“…IPs occupy a very small fraction of CVs; about 50 confirmed IPs account only for ∼2% of catalogued CVs (Downes et al 2001;Barlow et al 2006). Nevertheless, their particular brightness in the hard X-rays to soft γ-rays makes IPs to stand out when the sky is seen in these bands.…”

Section: Introductionmentioning

confidence: 99%

Suzaku X-Ray Study of an Anomalous Source XSS J12270–4859

Saitou

Tsujimoto

Ebisawa

et al. 2009

Publications of the Astronomical Society of Japan

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We report the results of the Suzaku X-ray observation of XSS J12270-4859, one of the hard X-ray sources in the INTEGRAL catalogue. The object has been classified as an intermediate polar (IP) by optical spectra and a putative X-ray period of ∼860 s. With a 30 ks exposure of Suzaku, we obtained a well-exposed spectrum in the 0.2-70 keV band. We conclude against the previous IP classification based on the lack of Fe Kα emission features in the spectrum and the failure to confirm the previously reported X-ray period. Instead, the X-ray light curve is filled with exotic phenomena, including repetitive flares lasting ∼100 s, occasional dips with no apparent periodicities, spectral hardening after some flares, and bimodal changes pivoting between quiet and active phases. The rapid flux changes, the dips, and the power-law spectrum point toward the interpretation that this is a low-mass X-ray binary. Some temporal characteristics are similar to those in the Rapid Burster and GRO J1744-28, making XSS J12270-4859 a very rare object.

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20-100 keV properties of cataclysmic variables detected in the INTEGRAL/IBIS survey

Cited by 110 publications

References 59 publications

Intermediate polars in the Swift/BAT survey: spectra and white dwarf masses

Intermediate polars in the Swift/BAT survey: spectra and white dwarf masses

The catalog of variable sources detected byINTEGRAL

Suzaku X-Ray Study of an Anomalous Source XSS J12270–4859

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