Evidence for local mass accretion rate variations in the disc of GRS 1915+105

Migliari, S.; Belloni, T.

doi:10.1051/0004-6361:20030484

Cited by 24 publications

(35 citation statements)

References 23 publications

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“…X-ray spectra of black hole binaries have been modeled as the combination of various soft and hard components, which may include but are not limited to: thermal radiation from the accretion disk, power-law emission, an explicit treatment of Comptonization, or bremsstrahlung emission. For the highly variable states of GRS 1915+105, a model consisting of a multi-temperature accretion disk plus some type of power law has been especially effective at tracking the relative changes in the accretion disk and Comptonization (see, e.g., Belloni et al 1997a;Migliari & Belloni 2003).…”

Section: Rxte Pcamentioning

confidence: 99%

The Physics of the “Heartbeat” State of GRS 1915+105

Neilsen

Remillard

Lee

2011

ApJ

158

282

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We present the first detailed phase-resolved spectral analysis of a joint Chandra High-Energy Transmission Grating Spectrometer and Rossi X-ray Timing Explorer observation of the ρ variability class in the microquasar GRS 1915+105. The ρ cycle displays a high-amplitude, double-peaked flare that recurs roughly every 50 s and is sometimes referred to as the "heartbeat" oscillation. The spectral and timing properties of the oscillation are consistent with the radiation pressure instability and the evolution of a local Eddington limit in the inner disk. We exploit strong variations in the X-ray continuum, iron emission lines, and the accretion disk wind to probe the accretion geometry over nearly six orders of magnitude in distance from the black hole. At small scales (1-10 R g ), we detect a burst of bremsstrahlung emission that appears to occur when a portion of the inner accretion disk evaporates due to radiation pressure. Jet activity, as inferred from the appearance of a short X-ray hard state, seems to be limited to times near minimum luminosity, with a duty cycle of ∼10%. On larger scales (10 5 -10 6 R g ), we use detailed photoionization arguments to track the relationship between the fast X-ray variability and the accretion disk wind. For the first time, we are able to show that changes in the broadband X-ray spectrum produce changes in the structure and density of the accretion disk wind on timescales as short as 5 s. These results clearly establish a causal link between the X-ray oscillations and the disk wind and therefore support the existence of a disk-jet-wind connection. Furthermore, our analysis shows that the mass-loss rate in the wind may be sufficient to cause long-term oscillations in the accretion rate, leading to state transitions in GRS 1915+105.

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Section: Rxte Pcamentioning

confidence: 99%

The Physics of the “Heartbeat” State of GRS 1915+105

Neilsen

Remillard

Lee

2011

ApJ

158

282

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“…This class shows distinctive characteristics and has not been analysed as deeply as, for instance, class β (see e.g. Mirabel et al 1998; Markwardt, Swank & Taam 1999; Migliari & Belloni 2003). Note that the θ and β observations shown in Fig.…”

Section: Class θ: Colours and Spectramentioning

confidence: 99%

High-frequency quasi-periodic oscillations from GRS 1915+105 in its C state

Belloni¹,

Soleri²,

Casella³

et al. 2006

Monthly Notices of the Royal Astronomical Society

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We report the results of a systematic timing analysis of RXTE observations of GRS 1915+105 when the source was in its variability class θ, characterized by alternating soft and hard states on a time‐scale of a few hundred seconds. The aim was to examine the high‐frequency part of the power spectrum in order to confirm the hectohertz quasi‐periodic oscillations (QPO) previously reported from observations from mixed variability behaviours. During the hard intervals (corresponding to state C in the classification of Belloni et al.), we find a significant QPO at a frequency of ∼170 Hz, although much broader (Q∼2) than previously reported. No other significant peak is observed at frequencies >30 Hz. A time‐resolved spectral analysis of selected observations shows that the hard intervals from class θ show a stronger and steeper (Γ= 2.8–3.0) power‐law component than hard intervals from other classes. We discuss these results in the framework of hectohertz QPOs reported from GRS 1915+105 and other black hole binaries.

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“…The dip ends with a bright spike, followed by 10–15 min of soft, bright X‐ray flares. These flares are coincident with strong optically thin radio/infrared oscillations (baby jets), but there is an ongoing debate as to whether these discrete ejections are produced during the dip itself or at the time of the X‐ray spike (Mirabel et al 1998; Eikenberry et al 1998; Migliari & Belloni 2003; Rothstein, Eikenberry & Matthews 2005; Rodriguez et al 2008a).…”

Section: Introductionmentioning

confidence: 99%

Accretion disc wind variability in the states of the microquasar GRS 1915+105

Neilsen

Petschek

Lee

2012

Monthly Notices of the Royal Astronomical Society

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Continuing our study of the role and evolution of accretion disc winds in the microquasar GRS 1915+105, we present high‐resolution spectral variability analysis of the β and γ states with the Chandra High‐Energy Transmission Grating Spectrometer. By tracking changes in the absorption lines from the accretion disc wind, we find new evidence that radiation links the inner and outer accretion discs on a range of time‐scales. As the central X‐ray flux rises during the high‐luminosity γ state, we observe the progressive overionization of the wind. In the β state, we argue that changes in the inner disc leading to the ejection of a transient ‘baby jet’ also quench the highly ionized wind from the outer disc. Our analysis reveals how the state, structure and X‐ray luminosity of the inner accretion disc all conspire to drive the formation and variability of highly ionized accretion disc winds.

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Evidence for local mass accretion rate variations in the disc of GRS 1915+105

Cited by 24 publications

References 23 publications

The Physics of the “Heartbeat” State of GRS 1915+105

The Physics of the “Heartbeat” State of GRS 1915+105

High-frequency quasi-periodic oscillations from GRS 1915+105 in its C state

Accretion disc wind variability in the states of the microquasar GRS 1915+105

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