Hard X‐ray states and radio emission in GRS 1915+105

By M. Klein-Wolt, Robert P. Fender, G. Pooley, T. Belloni, Simone Migliari, E. Morgan, M. van der Klis. 2001

165 citations recorded by the source corpus.

We compare simultaneous Ryle Telescope radio and Rossi X-Ray Timing Explorer X-ray observations of the galactic microquasar GRS 1915+105, using the classification of the X-ray behaviour in terms of three states as previously established. We find a strong (one-to-one) relation between radio oscillation events and series of spectrally hard states in the X-ray light curves, if the hard states are longer than ∼100 s and are 'well separated' from each other. In all other cases the source shows either low-level or high-level radio emission, but no radio oscillation events. During intervals when the source stays in the hard spectral state for periods of days to months, the radio behaviour is quite different; during some of these intervals a quasi-continuous jet is formed with an almost flat synchrotron spectrum extending to at least the near-infrared. Based on the similarities between the oscillation profiles at different wavelengths, we suggest a scenario which can explain most of the complex X-ray:radio behaviour of GRS 1915+105. We compare this behaviour with that of other black hole sources, and challenge previous reports of a relation between spectrally soft X-ray states and the radio emission.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/8a6c0d488254b8d494934e71c9eb6b960dd39a2f

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

The Spin of the Near-Extreme Kerr Black Hole GRS 1915+105 (2006, background): “GRS 1915+105 (hereafter GRS1915) frequently displays extraordinary X-ray variability that is not mimicked by any other black hole system (e.g., Belloni et al. 2000; Klein-Wolt et al. 2002).”
GRS 1915+105 and the Disc-Jet Coupling in Accreting Black Hole Systems (2004, background): “However, a general characteristic did emerge early on, namely that plateau states are generally followed (and perhaps preceded) by major ejection events (e.g., Foster et al. 1996, Fender et al. 1999, Dhawan et al. 2000, Klein-Wolt et al. 2002) (see Figure 19).”
WATCHDOG: A COMPREHENSIVE ALL-SKY DATABASE OF GALACTIC BLACK HOLE X-RAY BINARIES (2015, background): “Modelling of this X-ray variability has led to major insights into the connection between the accretion disk and relativistic jets in XRBs (Belloni et al. 1997; Klein-Wolt et al. 2002).”
Radio/X-ray correlation in the low/hard state of GX 339-4 (2003, background): “A more complex relation, but still indicating a relation between radio emitting electrons and the hard X-ray power law dominated state (like that in the LHS of BHC), is found in GRS 1915+105 (Klein-Wolt et al. 2002).”
On the Origin of Radio Emission in the X-Ray States of XTE J1650–500 during the 2001-2002 Outburst (2004, background): “Oscillations between states A, B and C are correlated with radio flaring activity (e.g. Klein-Wolt et al. 2002) with stronger radio emission in the spectrally hard state C, whereas the soft states are never associated with bright radio emission.”
A Unified Model for Black Hole X-Ray Binary Jets? (2004, background): “It has clearly been established in this source that phases of hard (C) X-ray emission lasting more than a few hundreds of seconds are associated with radio events, and that when the source is only in soft (A,B) states there is no radio emission (Klein-Wolt et al. 2002).”