CHARACTERIZING THE RADIO-X-RAY CONNECTION IN GRS 1915+105
- Laboratoire AIM, CEA/IRFU - CNRS/INSU - Universite Paris Diderot, CEA DSM/IRFU/SAp, Centre de Saclay, F-91191 Gif-sur-Yvette (France)
We analyzed radio and X-ray observations of GRS 1915+105, between 1995 May and 2006 June, focusing on the times characterized by radio flares and cycles of hard dips-soft spikes in the X-ray light curve. Assuming these flares to be discrete ejections, we applied a plasmon model to the radio data, with good agreement with the light curves. We fitted a total of 687 radio flares with a standard model of a plasmon. We found that the distribution of width is t{sub 0} = 1160 s with an rms deviation of 360 s, while that of the amplitude is S {sub max} = 59 mJy with an rms deviation of 28 mJy. The distribution of width is thus rather peaked, while that of the amplitude is not. Regarding radio and X-ray links, this study confirms previous observations on smaller data sets, namely that X-ray cycles of hard dips-soft spikes are always followed by radio flares. A strong correlation is found between the length of X-ray 'dips' in the X-ray light curves and the amplitude and fluence of the subsequent radio oscillations. A model of an exponential rise of the form L{sub 15GHz}({Delta}t) = L {sub max}(1 - exp(-({Delta}t - {Delta}t{sub min})/{tau}) is in good agreement with the observations, with the maximum fluence L{sub max} on the order of 70 Jy s, and the characteristic time {tau} on the order of 200-500 s. We discuss possible physical interpretations of this correlation, regarding the nature of the ejected material and the physical process responsible for the ejection.
- OSTI ID:
- 21455186
- Journal Information:
- Astrophysical Journal, Vol. 717, Issue 2; Other Information: DOI: 10.1088/0004-637X/717/2/1222; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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