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J/A+A/397/711       Comptonization and reflection in GRS 1915+105   (Rau+, 2003)

Comptonization and reflection of X-ray radiation and the X-ray-radio correlation in the χ-states of GRS 1915+105. Rau A., Greiner J. <Astron. Astrophys. 397, 711 (2003)> =2003A&A...397..711R
ADC_Keywords: X-ray sources ; Binaries, X-ray Keywords: X-ray: stars - stars: binaries: close - X-rays: individual: GRS 1915+105 Abstract: We present a comprehensive X-ray study of four years of pointed RXTE observations of GRS 1915+105 in the χ-state. We interpret the behavior of the hard power law tail spectrum as coming from inverse Compton scattering of soft disk photons on a thermally dominated hybrid corona above the accretion disk. GRS 1915+105 shows a strong, variable reflection amplitude. As in other BHC and in Seyfert galaxies, a correlation between the power law slope and the reflection was found. Also, the radio fluxes at 2.25GHz and 15GHz correlate with the power law slope, thus revealing a connection between the outflowing matter and the comptonizing region in the χ-states. Description: Results of the analysis of 139 RXTE spectra of GRS 1915+105 in the χ-state are shown. PCU0 of the Proportional Counter Array (PCA) and High Energy X-Ray Timing Experiment (HEXTE) Cluster 0 data were fitted in XSPEC 11.0 with a model consisting of of (i) photoelectric absorption (WABS; Balucinska-Church & McGammon, 1992, Cat. VI/62), (ii) a spectrum from an accretion disk consisting of multiple blackbody components (DISKBB) and (iii) a power law spectrum reflected from an ionized relativistic accretion disk (REFSCH; Fabian et al., 1989MNRAS.238..729F, Magdziarz & Zdziarski, 1995MNRAS.273..837M). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 19 15 11.5 +10 56 44 GRS 1915+105 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 161 139 Fitting results
See also: VI/62 : Photoelectric absorption cross-sections (Balucinska-Church+, 1992) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 "YYYY/MM/DD" Date Observational date 12- 21 F10.2 d JD Julian date 24- 27 I4 s Exp Exposure time 30- 33 I4 ct/s PCU0 Count rate in PCU0 36- 37 I2 ct/s H0 Count rate in Hexte cluster 0 40- 44 F5.2 keV kT Accretion disk temperature 47- 51 F5.2 keV E_kT Upper error of kT 53- 57 F5.2 keV e_kT Lower error of kT 59- 64 F6.2 --- Dbbno Accretion disk normalization (1) 66- 71 F6.2 --- E_Dbbno Upper error of Dbbno 73- 77 F5.2 --- e_Dbbno Lower error of Dbbno 80- 83 F4.2 --- Gamma Power law photon index (2) 86- 89 F4.2 --- E_Gamma Upper error of Gamma 92- 95 F4.2 --- e_Gamma Lower error of Gamma 97-101 F5.2 --- Refl Reflection amplitude 103-107 F5.2 --- E_Refl Upper error of Refl 109-113 F5.2 --- e_Refl Lower error of Refl 115-119 F5.1 ph/cm2/s/keV Kpo Power law normalization (2) 122-125 F4.1 ph/cm2/s/keV E_Kpo Upper error of Kpo 128-131 F4.1 ph/cm2/s/keV e_Kpo Lower error of Kpo 134-137 I4 --- xi Ionization parameter 140-143 I4 --- E_xi Upper error of xi 146-149 I4 --- e_xi Lower error pf xi 152-155 F4.2 --- c Factor for normalization of PCU0 and Hexte Cluster 0 158-161 F4.2 --- chi2 Reduced chi-square
Note (1): Dbbno = [ri/(D/10kpc)]2*cosθ , where ri is the inner disk radius Note (2): the Gamma index is such that N(E) = Kpo (E/Eo)-Gamma where N(E) = number of photons/keV/cm2/s, Kpo = normalization for Eo = 1keV
Acknowledgements: Arne Rau
(End) Arne Rau [MPE, Germany] 06-Oct-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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