Study of the Largest Multiwavelength Campaign of the Microquasar GRS 1915+105

Abstract

We present the results from a multiwavelength campaign of GRS 1915+105 performed from 2000 April 16 to 25. This is one of the largest coordinated set of observations ever performed for this source, covering the wide energy band in radio (13.3-0.3 cm), near-infrared (J-H-K), X-rays and Gamma-rays (from 1 keV to 10 MeV). During the campaign GRS 1915+105 was predominantly in the "plateau" (or low/hard) state but sometimes showed soft X-ray oscillations: before April 20.3, rapid, quasi-periodic (~= 45 min) flare-dip cycles were observed. The radio flares observed on April 17 shows frequency- dependent peak delay, consistent with an expansion of synchrotron-emitting region starting at the transition from the hard-dip to the soft-flare states in X-rays. On the other hand, infrared flares on April 20 appear to follow (or precede) the beginning of X-ray oscillations with an inconstant time delay of ~= 5-30 min. This implies that the infrared emitting region is located far from the black hole by >~ 10E13 cm, while its size is <~ 10E12 cm constrained from the time variability. We find a good correlation between the quasi-steady flux level in the near-infrared band and in the X-ray band. From this we estimate that the reprocessing of X-rays, probably occurring in the outer parts of the accretion disk, accounts for about 20-30% of the observed K magnitude in the plateau state. The OSSE spectrum in the 0.05-10 MeV band is represented by a single power law with a photon index of 3.1 extending to ~1 MeV with no cutoff. The power-law slope above ~30 keV is found to be very similar between different states in spite of large flux variations in soft X-rays, implying that the electron energy distribution is not affected by the change of the state in the accretion disk.

arXiv comment31 pages, 11 figures. Accepted for publication in ApJ, vol. 571, 2002. Minor corrections. Figure 2 is revised (numbers on the top axis are corrected). References are updated

References in corpus (28)

• Sources of Relativistic Jets in the Galaxy
• Radiation mechanisms and geometry of Cygnus X-1 in the soft state
• Powerful jets from black hole X-ray binaries in Low/Hard X-ray states
• MERLIN observations of relativistic ejections from GRS 1915+105
• In-flight Performance of the High Energy X-ray Timing Experiment on the Rossi X-ray Timing Explorer
• An unusually massive stellar black hole in the Galaxy
• AU-Scale Synchrotron Jets and Superluminal Ejecta in GRS 1915+105
• An unstable central disk in the superluminal black-hole X-ray binary GRS 1915+105
• Simultaneous X-ray and gamma-ray observations of Cyg X-1 in the hard state by Ginga and OSSE
• A Black Hole in the Superluminal source SAX J1819.3-2525 (V4641 Sgr)
• Hard X-ray states and radio emission in GRS 1915+105
• Gamma-Ray Spectral States of Galactic Black Hole Candidates
• High resolution Chandra HETG and RXTE observations of GRS 1915+105 : A hot disk atmosphere & cold gas enriched in Iron and Silicon
• The Chandra HETGS and RXTE view of GRS 1915+105
• The variable radio emission from GRS 1915+105
• Evidence for a Disk-Jet Interaction in the Microquasar GRS 1915+105
• OSSE and RXTE Observations of GRS 1915+105: Evidence for Non-thermal Comptonization
• The very flat radio - millimetre spectrum of Cygnus X-1
• Identification of the donor in the X-ray binary GRS 1915+105
• Rapid infrared flares in GRS 1915+105 : evidence for infrared synchrotron emission
• XTE J1550-564: A superluminal ejection during the September 1998 outburst
• Infrared synchrotron oscillations in GRS 1915+105
• Radio Emission and the Timing Properties of the Hard X-ray State of GRS 1915+105
• Giant repeated ejections from GRS 1915+105
• Faint Infrared Flares from the Microquasar GRS 1915+105
• A search for possible interactions between ejections from GRS 1915+105 and the surrounding interstellar medium
• Disk-Jet Connection in the Microquasar GRS 1915+105 and IR and Radio Emission
• Excess sub-millimetre emission from GRS 1915+105

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• A Massive Jet Ejection Event from the Microquasar SS 433 Accompanying Rapid X-Ray Variability
• Broadband X-ray Spectral and Timing Analyses of the Black Hole Binary Candidate Swift J1658.2-4242: Rapid Flux Variation and the Turn-on of a Transient QPO
• Connection between accretion disk and superluminal radio jets and the role of radio plateau state in GRS 1915+105
• Observations of Rapid Disk-Jet Interaction in the Microquasar GRS 1915+105
• Is the plateau state in GRS 1915+105 equivalent to canonical hard states?
• 2.5-dimensional solution of the advective accretion disk: A self-similar approach
• Near-Infrared and X-Ray Observations of XSS J12270-4859
• Modeling the Broadband Spectral Energy Distribution of the Microquasars XTE J1550-564 and H 1743-322
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• Identification of a 12-17 day timescale in X-ray observations of GRS 1915+105
• HST/NICMOS Observations of Fast Infrared Flickering in the Microquasar GRS 1915+105
• Searching for quantum-gravity footprint around stellar-mass black holes
• Multi-wavelength observation of MAXI J1348$-$630 during the outburst in 2019