INTEGRAL-RXTE observations of Cygnus X-1

K. Pottschmidt; J. Wilms; M. Chernyakova; M.A. Nowak; J. Rodriguez; A.A. Zdziarski; V. Beckmann; P. Kretschmar; T. Gleissner; G.G. Pooley; S. Martinez-Nunez; T.J.L. Courvoisier; V. Schonfelder; R. Staubert

INTEGRAL-RXTE observations of Cygnus X-1

K. Pottschmidt, J. Wilms, M. Chernyakova, M.A. Nowak, J. Rodriguez, A.A. Zdziarski, V. Beckmann, P. Kretschmar, T. Gleissner, G.G. Pooley, S. Martinez-Nunez, T.J.L. Courvoisier, V. Schonfelder, R. Staubert

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

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 kTsimilar to50-90 keV and an optical depth of tausimilar to1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pisimilar to0.2-0.3. 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 detectors, with the remaining issues being mainly related to the flux calibration of INTEGRAL.

Original language	English
Journal	Astronomy and Astrophysics
Volume	411
Issue number	1
Pages (from-to)	L383-L388
ISSN	0004-6361
Publication status	Published - 2003

Keywords

gamma rays : observations
stars : individual : Cyg X-1
black hole physics
X-rays : general
X-rays : binaries

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title = "INTEGRAL-RXTE observations of Cygnus X-1",

abstract = "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 kTsimilar to50-90 keV and an optical depth of tausimilar to1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pisimilar to0.2-0.3. 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 detectors, with the remaining issues being mainly related to the flux calibration of INTEGRAL.",

keywords = "gamma rays : observations, stars : individual : Cyg X-1, black hole physics, X-rays : general, X-rays : binaries",

author = "K. Pottschmidt and J. Wilms and M. Chernyakova and M.A. Nowak and J. Rodriguez and A.A. Zdziarski and V. Beckmann and P. Kretschmar and T. Gleissner and G.G. Pooley and S. Martinez-Nunez and T.J.L. Courvoisier and V. Schonfelder and R. Staubert",

year = "2003",

language = "English",

volume = "411",

pages = "L383--L388",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "1",

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TY - JOUR

T1 - INTEGRAL-RXTE observations of Cygnus X-1

AU - Pottschmidt, K.

AU - Wilms, J.

AU - Chernyakova, M.

AU - Nowak, M.A.

AU - Rodriguez, J.

AU - Zdziarski, A.A.

AU - Beckmann, V.

AU - Kretschmar, P.

AU - Gleissner, T.

AU - Pooley, G.G.

AU - Martinez-Nunez, S.

AU - Courvoisier, T.J.L.

AU - Schonfelder, V.

AU - Staubert, R.

PY - 2003

Y1 - 2003

N2 - 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 kTsimilar to50-90 keV and an optical depth of tausimilar to1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pisimilar to0.2-0.3. 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 detectors, with the remaining issues being mainly related to the flux calibration of INTEGRAL.

AB - 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 kTsimilar to50-90 keV and an optical depth of tausimilar to1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pisimilar to0.2-0.3. 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 detectors, with the remaining issues being mainly related to the flux calibration of INTEGRAL.

KW - gamma rays : observations

KW - stars : individual : Cyg X-1

KW - black hole physics

KW - X-rays : general

KW - X-rays : binaries

M3 - Journal article

SN - 0004-6361

VL - 411

SP - L383-L388

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 1

ER -

INTEGRAL-RXTE observations of Cygnus X-1

Abstract

Keywords

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