J/A+A/513/A21GRS 1915+105 timing analysis (Massaro+, 2010)

The complex behaviour of the microquasar GRS 1915+105 in the rho class observed with Beppo-SAX. I: Timing analysis. Massaro E., Ventura G., Massa F., Feroci M., Mineo T., Cusumano G., Casella P., Belloni T. <Astron. Astrophys. 513, A21 (2010)> =2010A&A...513A..21MADC_Keywords: QSOs ; X-ray sources ; AccretionKeywords: binaries: close - accretion, accretion disks - stars: individual: GRS 1915+105 - X-rays: starsAbstract: GRS 1915+105 was observed by BeppoSAX for about 10 days in October 2000. For about 80% of the time, the source was in the variability class rho, characterised by a series of recurrent bursts. We describe the results of the timing analysis performed on the MECS (1.6-10keV) and PDS (15-100keV) data. The X-ray count rate from GRS 1915+105 showed an increasing trend with different characteristics in the various energy bands: in the bands (1.6-3keV) and (15-100keV), it was nearly stable in the first part of the pointing and increased in a rather short time by about 20%, while in the energy range (3-10keV) the increase had a smoother trend.Description: Table A2 contains initial times (starting from 20 October 2000 at UT=21h26m55s, duration and mean count rates in the MECS (1.6-10keV), and PDS (15-100keV) of all time series for the pointing of October 2000. Multiplicity of bursts: for each series we report the number of complete bursts, the numbers of bursts with multiplicities from p1 to p4 and higher and the number of anomalous bursts. Table A3 contains results of the Fourier and wavelet spectral analysis and the classification of the considered 89 MECS time series. For each series is given the name code, the P1/P2 power ratio of two highest peaks, the recurrence time of the unique (for the S series) and of the two (for the T series) dominant peaks or the centroid and the interval width (for the M series), the temporal resolution at the peak, the time scale of the maximum in the wavelet spectra, the ratio R_w and the series classification.Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 19 15 11.6 +10 56 44 GRS 1915+105 = V* V1487 Aql ----------------------------------------------------------File Summary:

FileName Lrecl Records Explanations

ReadMe 80 . This file tablea2.dat 71 172 Initial times and multiplicity of bursts tablea3.dat 48 102 Results of the Fourier and wavelet spectral analysis

See also: J/A+A/397/711 : Comptonization and reflection in GRS 1915+105 (Rau+, 2003) J/ApJ/657/409 : K-band light curve of GRS 1915+105 (Neil+, 2007)Byte-by-byte Description of file: tablea2.dat

Bytes Format Units Label Explanations

1- 4 A4 --- Series Series code 6- 13 F8.1 s Time Initial time, origin is 20 October 2000 at UT=21h26m55s 15- 20 F6.1 s Dur Duration of burst 22- 26 F5.1 ct Ct(1.6-10) MECS (1.6-10keV) mean count rate [energy channels 36-220] 28- 31 F4.1 ct Ct(1.6-3) MECS (1.6-3.0keV) mean count rate [energy channels 36-66] 33- 37 F5.1 ct Ct(3-5) MECS (3.0-5.0keV) mean count rate [energy channels 67-110] 39- 42 F4.1 ct Ct(5-10) MECS (5.0-10keV) mean count rate [energy channels 110-220] 44- 47 F4.1 ct Ct(15-150) ?=- PDS (15-150keV) mean count rate 49- 50 I2 --- Nbursts Number of complete bursts 52- 53 I2 --- Np1 Number of p1 bursts 55- 56 I2 --- Np2 Number of p2 bursts 58- 59 I2 --- Np3 Number of p3 bursts 61- 62 I2 --- Np4 Number of p4 bursts 64 I1 --- Np>4 Number of p>4 bursts 66- 69 F4.2 --- N<p> Mean burst multiplicity 71 I1 --- Nab Number of anomalous bursts

Byte-by-byte Description of file: tablea3.dat

Bytes Format Units Label Explanations

1- 4 A4 --- Series Series code 6- 9 F4.2 --- P1/P2 ?=- P1/P2 power ratio of two highest peaks 11- 14 F4.1 s Trec ? Recurrence time of the unique (for the S series) or the first (for the T series) dominant peak 16- 19 F4.1 s Trec2 ? Recurrence time of the second dominant peak (for the T series) 21- 24 F4.1 s Trec3 ? Recurrence time of the centroid (for the M series) 26- 29 F4.1 s Width ? Interval width (for the M series) 31- 33 F3.1 s Deltat Temporal resolution at the peak 35- 39 F5.1 s <Tmax> Time scale of the maximum in the wavelet spectra 41- 45 F5.2 % Rw Ratio Rw (=sigma_T_/<Tmax>) of the standard deviation of the T_{J,max}to its mean value across the series (1) 47- 48 A2 --- Type S, T or M series classification

Note (1): The Rw ratio can be then taken as a measure of the stability of the recurrence time.

Acknowledgements: Enrico Massaro, enrico.massaro(at)uniroma1.it(End)Patricia Vannier [CDS] 12-Mar-2010

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