ar X iv : a st ro - p h / 97 06 24 4 v 1 2 4 Ju n 19 97 GRS 1915 + 105 : Flares , QPOs and other events at 15 GHz
نویسنده
چکیده
Monitoring with the Ryle Telescope at 15 GHz of the Galactic X-ray transient source GRS 1915+105 has revealed a remarkable range of rapid and extended flares which appear to be related to the X-ray emission as recorded by the RXTE all-sky monitor. Quasi-periodic oscillations in the range 20 – 40 min have been found and are probably related to oscillations in the soft X-ray flux.
منابع مشابه
ar X iv : a st ro - p h / 02 08 06 8 v 1 2 A ug 2 00 2 Fast Infrared Sub - Flares From GRS 1915 + 105
We report the discovery of fast (∼ 100 sec) 2.2 µm flares from the micro-quasar GRS 1915+105, which are superimposed on longer (∼ 30 min), brighter flares corresponding to episodes of jet formation. The number and strength of the sub-flares in each bright flare varies, and does not seem to correlate in any obvious way with the underlying light curve or with changes in the X-ray emission. Howeve...
متن کاملar X iv : a st ro - p h / 98 07 20 4 v 1 2 0 Ju l 1 99 8 Spectroscopy of Infrared Flares from the Microquasar GRS 1915 + 105
We present near-infrared medium-resolution (R ∼ 875) spectra of the microquasar GRS 1915+105 on 1997 August 13-15 UTC from the Hale 200-inch telescope. The spectra show broad emission lines of He I (2.058 µm) and H I (2.166 µm-Brγ), consistent with previous work. On August 14 UTC, we took spectra with ∼ 6-minute time resolution during infrared flaring events similar to those reported in Eikenbe...
متن کاملar X iv : a st ro - p h / 97 10 37 4 v 1 1 N ov 1 99 7 Evidence for a Disk - Jet Interaction in the Microquasar GRS 1915 + 105
We report simultaneous X-ray and infrared (IR) observations of the Galactic microquasar GRS1915+105 using XTE and the Palomar 200-inch telescope on August 13-15, 1997 UTC. During the last two nights, the microquasar GRS 1915+105 exhibited quasi-regular X-ray/infrared (IR) flares with a spacing of ∼ 30 minutes. While the physical mechanism triggering the flares is currently unknown, the one-to-o...
متن کاملar X iv : a st ro - p h / 96 12 12 8 v 1 1 3 D ec 1 99 6 The Pattern of Correlated X - ray Timing and Spectral Behavior in GRS 1915 + 105
From data obtained from the PCA in the 2-11 keV and 11-30.5 keV energy range, GRS 1915+105 is seen during RXTE observations between 1996 May and October on two separate branches in a hardness intensity diagram. On the hard branch, GRS 1915+105 exhibits narrow quasi-periodic oscillations ranging from 0.5 to 6 Hz with ∆ν ν ∼ 0.2. The QPOs are observed over intensities ranging from about 6,000 to ...
متن کاملar X iv : a st ro - p h / 97 06 06 1 v 1 6 J un 1 99 7 Study of the synchrotron and inverse Compton radiations of relativistic jets in GRS 1915 + 105
We show that comparison of the detailed calculations of the synchrotron radiation of expanding magnetized clouds (plasmoids) with the temporal and spectral evolution of radio flares observed from the recently discovered galactic " microquasar " GRS 1915+105 imposes strong constraints on the model parameters of relativistic plasmoids, in particular, on the absolute values and time-dependence of ...
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تاریخ انتشار 1997