0000000001008575

AUTHOR

Volker Beckmann

showing 3 related works from this author

INTEGRAL/RXTE Observations of Cygnus X-1

2003

We present first results from contemporaneous observations of Cygnus X-1 with INTEGRAL and RXTE, made during INTEGRAL's performance verification phase in 2002 November and December. Consistent with earlier results, the 3-250 keV data are well described by Comptonization spectra from a Compton corona with a temperature of kT~50-90 keV and an optical depth of tau~1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pi~0.2-0.3. A soft excess below 10 keV, interpreted as emission from the accretion disk, is seen to decrease during the 1.5 months spanned by our observations. Our results indicate a remarkable consistency among the independently calibrated de…

Black hole physics ; Individual stars ; Cyg X-1 ; Gamma rays ; X-rays observations ; BinariesAstrophysics::High Energy Astrophysical PhenomenaPhase (waves)FOS: Physical sciencesFlux02 engineering and technologyAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsCyg X-101 natural sciencesOmegaSpectral lineIonizationIndividual stars0103 physical sciencesOptical depth (astrophysics)0202 electrical engineering electronic engineering information engineeringCalibration010303 astronomy & astrophysicsOptical depthPhysics010308 nuclear & particles physicsGamma raysBinariesAstrophysics (astro-ph)X-rays observationsGamma rayAstronomyAstronomy and Astrophysics020206 networking & telecommunicationsBlack hole physics:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]CoronaSpace and Planetary ScienceReflection (physics)020201 artificial intelligence & image processingUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]AIP Conference Proceedings
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INTEGRALobservations of the Be/X-ray binary EXO 2030+375 during outburst

2005

We present a type-I outburst of the high-mass X-ray binary EXO 2030+375, detected during INTEGRAL's Performance and Verification Phase in December 2002 (on-source time about 10e+06 seconds). In addition, six more outbursts have been observed during INTEGRAL's Galactic Plane Scans. X-ray pulsations have been detected with a pulse period of 41.691798+-0.000016 s. The X-ray luminosity in the 5-300 keV energy range was 9.7*10e+36 erg/s, for a distance of 7.1 kpc. Two unusual features were found in the light curve, with an initial peak before the main outburst and another possible spike after the maximum. RXTE observations confirm only the existence of the initial spike. Although the initial pea…

PhysicsRange (particle radiation)Astrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)Phase (waves)X-ray binaryFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGalactic planeAstrophysicsLight curvePower lawLuminositySpherical geometrySpace and Planetary ScienceAstronomy & Astrophysics
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Assessing the effects of information on the level of support toward charismatic and inconspicuous wildlife species in a highly threatened wetland by …

2018

The inclusion of human communities into practical conservation of threatened species has received increasing recognition. One way to achieve this is to understand the current (actual) relation between people and wildlife in a specific territory (1,2,3). The advantage of such understanding is to predict public support towards wildlife species, and therefore develop accurate environmental management strategies (2). The willingness to pay method has been used for this purpose (3). Based on surveys, this method elicits the level of support of people by identifying the amount of money that a person would be willing to give to support conservation activities (3). In the present study it will be u…

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