Radio and X-Ray Variability of the Galactic Superluminal Source GRS 1915+105

Foster, Rosalind; Waltman, E. B.; Tavani, M.; Harmon, B. A.; Zhang, S. N.; Pačiesas, W. S.; Ghigo, F. D.

doi:10.1086/310199

Cited by 97 publications

(102 citation statements)

References 14 publications

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“…Long periods of the χ luminosity class during which compact jets are present are called plateau, and often precede or follow a giant ejection (see e.g. Foster et al 1996;Fender et al 1999;Dhawan et al 2000;Klein-Wolt et al 2002;Fuchs et al 2003b). -Miramond et al (2002) presented an ISO spectrophotometric study of Cygnus X−3 in quiescence, and found the MIR continuum to be due to free-free emission from the winds of the Wolf-Rayet companion star with perhaps a contribution from a cold dust component (see Fuchs et al 2006, for similar conclusions on SS 433).…”

Section: Grs 1915+105mentioning

confidence: 99%

LONG-TERM MULTI-WAVELENGTH STUDIES OF GRS 1915+105. I. A HIGH-ENERGY AND MID-INFRARED FOCUS WITHRXTE/INTEGRALANDSPITZER

Rahoui

Chaty

Rodríguez

et al. 2010

ApJ

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To date, mid-infrared properties of Galactic black hole binaries have barely been investigated in the framework of multi-wavelength campaigns. Yet, studies in this spectral domain are crucial to get complementary information on the presence of dust and/or on the physical processes such as dust heating and thermal bremsstrahlung. Here, we report a long-term multi-wavelength study of the microquasar GRS 1915+105. On the one hand, we aimed at understanding the origins of the mid-infrared emission, and on the other hand, at searching for correlation with the high-energy and/or radio activities. We observed the source at several epochs between 2004 and 2006 with the photometer IRAC and spectrometer IRS, both mounted on the Spitzer Space Telescope. When available, we completed our set of data with quasi-simultaneous RXTE /INTEGRAL highenergy and/or Ryle radio observations from public archives. We then studied the mid-infrared environment and activities of GRS 1915+105 through spectral analysis and broad band fitting of its radio to X-ray spectral energy distributions. We detected polycyclic aromatic hydrocarbon molecules in all but one IRS spectra of GRS 1915+105 which unambiguously proves the presence of a dust component, likely photoionised by the high-energy emission. We also argue that this dust is distributed in a disc-like structure heated by the companion star, as observed in some Herbig Ae/Be and isolated cool giant stars. Moreover, we show that some of the soft X-ray emission emanating from the inner regions of the accretion disc is reprocessed and thermalised in the outer part. This leads to a mid-infrared excess that is very likely correlated to the soft X-ray emission.We exclude thermal bremsstrahlung as contributing significantly in this spectral domain.-3 -

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Section: Grs 1915+105mentioning

confidence: 99%

LONG-TERM MULTI-WAVELENGTH STUDIES OF GRS 1915+105. I. A HIGH-ENERGY AND MID-INFRARED FOCUS WITHRXTE/INTEGRALANDSPITZER

Rahoui

Chaty

Rodríguez

et al. 2010

ApJ

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“…In fact, the radio emission during the plateau state is considered to originate from the steady, compact jet ( [8]). …”

Section: Discussionmentioning

confidence: 99%

“…Arai characterized by the prolonged hard X-ray emission associated with the steady synchrotron radio emission (e.g., [8]). Plateau states have a precursor flare (e.g., [13]).…”

Section: Near-infrared Observation Of Grs 1915+105mentioning

confidence: 99%

Nearinfrared observation of GRS 1915+105 in the soft state

Arai¹

2009

Proceedings of VII Microquasar Workshop: Microquasars and Beyond — PoS(MQW7)

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We report detailed, long term near-infrared (NIR) light curves of GRS 1915+105 in 2007GRS 1915+105 in -2008, covering its long "soft state" for the first time. From our NIR monitoring and the X-ray data of the All Sky Monitor (ASM) onboard Rossi X-ray Timing Explorer (RXTE), we discovered that the NIR flux dropped by >1 mag during short X-ray flares with a time-scale of days. With the termination of the soft state, the H − K s color reddened and the anti-correlation pattern was broken. The observed H − K s color variation suggests that the dominant NIR source was an accretion disk during the soft state. The short X-ray flares during the soft state were associated with spectral hardening in X-rays and increasing radio emission indicating jet ejection. The temporal NIR fading during the X-ray flares, hence, implies a sudden decrease of the contribution of the accretion disk when the jet is ejected.

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“…In particular, there is a phenomenological relation between the X-ray "plateau" state and strong radio flares. The plateau state is characterized by a quasi-steady, optically-thick radio emission at the 50-200 mJy level, while the X-ray spectrum is dominated by a hard power-law component (Foster et al 1996;Fender et al 1999). It is sometimes related to one of the canonical states of X-ray binaries, namely the low/hard state (Klein-Wolt et al 2002).…”

Section: Introductionmentioning

confidence: 99%

HESS upper limits on very high energy gamma-ray emission from the microquasar GRS 1915+105

Acero¹,

Aharonian²,

Akhperjanian³

et al. 2009

A&A

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Context. High energy particles reside in the relativistic jets of microquasars, making them possible sources of very high energy radiation (VHE, >100 GeV). Detecting this emission would provide a new handle on jet physics. Aims. Observations of the microquasar GRS 1915+105 with the HESS telescope array were undertaken in 2004-2008 to search for VHE emission. Methods. Stereoscopic imaging of Cherenkov radiation from extensive air showers is used to reconstruct the energy and direction of the incident gamma rays. Results. There is no evidence for a VHE gamma-ray signal either from the direction of the microquasar or its vicinity. An upper limit of 6.1 × 10 −13 ph cm −2 s −1 (99.9% confidence level) is set on the photon flux above 410 GeV, equivalent to a VHE luminosity of ∼10 34 erg s −1 at 11 kpc. Conclusions. The VHE to X-ray luminosity ratio in GRS 1915+105 is at least four orders of magnitude lower than the ratio observed in gamma-ray binaries. The VHE radiative efficiency of the compact jet is less than 0.01% based on its estimated total power of 10 38 erg s −1 . Particle acceleration in GRS 1915+105 is not efficient at high energies and/or the magnetic field is too strong. It is also possible that VHE gamma-rays are produced by GRS 1915+105, but the emission is highly time-dependent.

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Radio and X-Ray Variability of the Galactic Superluminal Source GRS 1915+105

Cited by 97 publications

References 14 publications

LONG-TERM MULTI-WAVELENGTH STUDIES OF GRS 1915+105. I. A HIGH-ENERGY AND MID-INFRARED FOCUS WITHRXTE/INTEGRALANDSPITZER

LONG-TERM MULTI-WAVELENGTH STUDIES OF GRS 1915+105. I. A HIGH-ENERGY AND MID-INFRARED FOCUS WITHRXTE/INTEGRALANDSPITZER

Nearinfrared observation of GRS 1915+105 in the soft state

HESS upper limits on very high energy gamma-ray emission from the microquasar GRS 1915+105

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