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J/A+A/407/1039      X-ray power spectra of Cygnus X-1       (Pottschmidt+, 2003)

Long term variability of Cygnus X-1 I. X-ray spectral-temporal correlations in the hard state. Pottschmidt K., Wilms J., Nowak M.A., Pooley G.G., Gleissner T., Heindl W.A., Smith D.M., Remillard R., Staubert R. <Astron. Astrophys. 407, 1039 (2003)> =2003A&A...407.1039P
ADC_Keywords: X-ray sources ; Binaries, X-ray Mission_Name: RXTE Keywords: stars: individual: Cyg X-1 - binaries: close - X-rays: stars Abstract: We present the long term evolution of the timing properties of the black hole candidate Cygnus X-1 in the 0.002-128 Hz frequency range as monitored from 1998 to 2001 with the Rossi X-ray Timing Explorer (RXTE). For most of this period the source was in its hard state. Description: This file contains the results of the fits of multiple Lorentzians to the X-ray power spectra of Cygnus X-1 as presented in Table 2 of the paper. Note that the data are sorted according to the Proposal ID and the OBSID, and are thus not in temporal order. Fit parameters which were not present in the fit are identified by setting them to NULL, i.e., by leaving the respective field blank. Where the error-bars of a fit parameter are equal to NULL by leaving the respective field blank, the corresponding parameter has been held fixed at the value given in the table. Where both error-bars are zero, the fit parameter was a free parameter, but the error itself has not been determined (e.g., caused by numerical instability in the case of the narrow Lorentzian components). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 19 58 21.7 +35 12 05 Cyg X-1 = HD 226868 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 1860 130 Results of fitting multiple Lorentzians to selected power spectra of the Cyg X-1 RXTE/PCA monitoring observations from 1998-2001 in the frequency range from (1/512)Hz to 32Hz (P30157) or 128Hz (others), for the 2-13keV band table2.fit 2880 27 FITS version of table2
See also: J/PAZh/26/27 : Variability of Cyg X-1 (V1357) in 1995-1996 (Karitskaya+, 2000) J/AZh/78/408 : Variability of Cyg X-1 in 1994-1998 (Karitskaya+, 2001) http://heasarc.gsfc.nasa.gov/FTP/xte/data/archive : XTE Archive Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Proposal ! RXTE Proposal Number 16- 17 A2 --- ObsID ! Observation ID 31- 38 A8 --- PCUOff ! PCUs which were off 53- 65 F13.5 d StartObs ! MJD of Start of Observation 71- 80 A10 "YYYY.MM.DD" Date ! Date of Observation 89- 95 F7.1 s ExpTime ! Exposure time 96-110 E15.6 --- Chi2 ! Chi-Squared of Fit 119-120 I2 --- DOF ! Degrees of Freedom 121-140 E20.6 --- R1 ? Norm of Lorentz 1 (1) 141-160 E20.6 --- E_R1 ? Error on R1 upper 1sigma (1) 161-180 E20.6 --- e_R1 ? Error on R1, lower 1sigma (1) 181-200 E20.6 Hz f1 ? Center Frequency of Lorentz 1 201-220 E20.6 Hz E_f1 ? Error on f1, upper 1sigma 221-240 E20.6 Hz e_f1 ? Error on f1, lower 1sigma 241-260 E20.6 --- Q1 ? Quality-Factor of Lorentz 1 (1) 261-280 E20.6 --- E_Q1 ? Error on Q1, upper 1sigma (1) 281-300 E20.6 --- e_Q1 ? Error on Q1, lower 1sigma (1) 301-320 E20.6 Hz Peak1 ? Peak of Lorentz 1 (derived) 321-340 E20.6 --- R2 ? Norm of Lorentz 2 341-360 E20.6 --- E_R2 ? Error on R2, upper 1sigma 361-380 E20.6 --- e_R2 ? Error on R2, lower 1sigma 381-400 E20.6 Hz f2 ? Center Frequency of Lorentz 2 401-420 E20.6 Hz E_f2 ? Error on f2, upper 1sigma 421-440 E20.6 Hz e_f2 ? Error on f2, lower 1sigma 441-460 E20.6 --- Q2 ? Quality-Factor of Lorentz 2 (1) 461-480 E20.6 --- E_Q2 ? Error on Q2, upper 1sigma (1) 481-500 E20.6 --- e_Q2 ? Error on Q2, lower 1sigma (1) 501-520 E20.6 Hz Peak2 ? Peak of Lorentz 2 (derived) 521-540 E20.6 --- R3 ? Norm of Lorentz 3 (1) 541-560 E20.6 --- E_R3 ? Error on R3, upper 1sigma (1) 561-580 E20.6 --- e_R3 ? Error on R3, lower 1sigma (1) 581-600 E20.6 Hz f3 ? Center Frequency of Lorentz 3 601-620 E20.6 Hz E_f3 ? Error on f3, upper 1sigma 621-640 E20.6 Hz e_f3 ? Error on f3, lower 1sigma 641-660 E20.6 --- Q3 ? Quality-Factor of Lorentz 3 (1) 661-680 E20.6 --- E_Q3 ? Error on Q3, upper 1sigma (1) 681-700 E20.6 --- e_Q3 ? Error on Q3, lower 1sigma (1) 701-720 E20.6 Hz Peak3 ? Peak of Lorentz 3 (derived) 721-740 E20.6 --- R4 ? Norm of Lorentz 4 (1) 741-760 E20.6 --- E_R4 ? Error on R4, upper 1sigma (1) 761-780 E20.6 --- e_R4 ? Error on R4, lower 1sigma (1) 781-800 E20.6 Hz f4 ? Center Frequency of Lorentz 4 801-820 E20.6 Hz E_f4 ? Error on f4, upper 1sigma 821-840 E20.6 Hz e_f4 ? Error on f4, lower 1sigma 841-860 E20.6 --- Q4 ? Quality-Factor of Lorentz 4 (1) 861-880 E20.6 --- E_Q4 ? Error on Q4, upper 1sigma (1) 881-900 E20.6 --- e_Q4 ? Error on Q4, lower 1sigma (1) 901-920 E20.6 Hz Peak4 ? Peak of Lorentz 4 (derived) 921-940 E20.6 --- R5 ? Norm of Lorentz 5 (1) 941-960 E20.6 --- E_R5 ? Error on R5, upper 1sigma (1) 961-980 E20.6 --- e_R5 ? Error on R5, lower 1sigma (1) 981-1000 E20.6 Hz f5 ? Center Frequency of Lorentz 5 1001-1020 E20.6 Hz E_f5 ? Error on f5, upper 1sigma 1021-1040 E20.6 Hz e_f5 ? Error on f5, lower 1sigma 1041-1060 E20.6 --- Q5 ? Quality-Factor of Lorentz 5 (1) 1061-1080 E20.6 --- E_Q5 ? Error on Q5, upper 1sigma (1) 1081-1100 E20.6 --- e_Q5 ? Error on Q5, lower 1sigma (1) 1101-1120 E20.6 Hz Peak5 ? Peak of Lorentz 5 (derived) 1121-1140 E20.6 --- R6 ? Norm of Lorentz 6 (1) 1141-1160 E20.6 --- E_R6 ? Error on R6, upper 1sigma (1) 1161-1180 E20.6 --- e_R6 ? Error on R6, lower 1sigma (1) 1181-1200 E20.6 Hz f6 ? Center Frequency of Lorentz 6 1201-1220 E20.6 Hz E_f6 ? Error on f6, upper 1sigma 1221-1240 E20.6 Hz e_f6 ? Error on f6, lower 1sigma 1241-1260 E20.6 --- Q6 ? Quality-Factor of Lorentz 6 (1) 1261-1280 E20.6 --- E_Q6 ? Error on Q6, upper 1sigma (1) 1281-1300 E20.6 --- e_Q6 ? Error on Q6, lower 1sigma (1) 1301-1320 E20.6 Hz Peak6 ? Peak of Lorentz 6 (derived) 1321-1340 E20.6 --- R7 ? Norm of Lorentz 7 (1) 1341-1360 E20.6 --- E_R7 ? Error on R7, upper 1sigma (1) 1361-1380 E20.6 --- e_R7 ? Error on R7, lower 1sigma (1) 1381-1400 E20.6 Hz f7 ? Center Frequency of Lorentz 7 1401-1420 E20.6 Hz E_f7 ? Error on f7, upper 1sigma 1421-1440 E20.6 Hz e_f7 ? Error on f7, lower 1sigma 1441-1460 E20.6 --- Q7 ? Quality-Factor of Lorentz 7 (1) 1461-1480 E20.6 --- E_Q7 ? Error on Q7, upper 1sigma (1) 1481-1500 E20.6 --- e_Q7 ? Error on Q7, lower 1sigma (1) 1501-1520 E20.6 Hz Peak7 ? Peak of Lorentz 7 (derived) 1521-1540 E20.6 --- R8 ? Norm of Lorentz 8 (1) 1541-1560 E20.6 --- E_R8 ? Error on R8, upper 1sigma (1) 1561-1580 E20.6 --- e_R8 ? Error on R8, lower 1sigma (1) 1581-1600 E20.6 Hz f8 ? Center Frequency of Lorentz 8 1601-1620 E20.6 Hz E_f8 ? Error on f8, upper 1sigma 1621-1640 E20.6 Hz e_f8 ? Error on f8, lower 1sigma 1641-1660 E20.6 --- Q8 ? Quality-Factor of Lorentz 8 (1) 1661-1680 E20.6 --- E_Q8 ? Error on Q8, upper 1sigma (1) 1681-1700 E20.6 --- e_Q8 ? Error on Q8, lower 1sigma (1) 1701-1720 E20.6 Hz Peak8 ? Peak of Lorentz 8 (derived) 1721-1740 E20.6 --- Power ? Norm of Power-Law (A) (2) 1741-1760 E20.6 --- E_Power ? Error on Power-Law, +1sigma 1761-1780 E20.6 --- e_Power ? Error on Power-Law, -1sigma 1793-1800 F8.6 --- Alpha ? Slope of Power-Law (2) 1813-1820 F8.6 --- E_Alpha ? Error on Alpha, upper 1sigma 1833-1840 F8.6 --- e_Alpha ? Error on Alpha, lower 1sigma 1856-1860 F5.3 --- Gamma ? Photon Index of X-ray Spectrum
Note (1): We describe the power spectra as the sum of Lorentzian profiles around the resonance frequency F of the form: L(f) = 1/π . (2R2QF) / (F2 + 4Q2(f-F)2) where F is the resonance frequency of the Lorentzian, Q ∼ F/ΔF(FWHM) its quality factor, and R its normalization constant. Note (2): Power-law of the form: PL(f)=R*f
Acknowledgements: Katja Pottschmidt
(End) Patricia Bauer [CDS] 19-Aug-2003
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