Multiwavelength observations of GRB afterglows

Castro-Tirado, A. J.

doi:10.1017/s1743921312012690

Cited by 16 publications

(18 citation statements)

References 37 publications

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“…However, further investigations over radio, optical, and X-ray bands are needed to specifically address the reason of radio lead for this atypical outburst. -Tirado et al (1992) discovered GRS 1915+105 using WATCH on board GRANAT satellite. Apparent superluminal jets were detected (Mirabel & Rodríguez (1994)).…”

Section: H 1743-322mentioning

confidence: 99%

Evidence of Outflow-induced Soft Lags of Galactic Black Holes

Patra

Chatterjee

Dutta

et al. 2019

ApJ

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The nature of lag variation of Galactic black holes remains enigmatic mostly because of nonlinear and nonlocal physical mechanisms which contribute to the lag of the photons coming from the region close to the central black holes. One of the widely accepted major sources of the hard lag is the inverse Comptonization mechanism. However, exact reason or reasons for soft lags is yet to be identified. In this paper, we report a possible correlation between radio intensities of several outbursting Galactic black hole candidates and amounts of soft lag. The correlation suggests that the presence of major outflows or jets also change the disk morphology along the line of sight of the observer which produces soft lags.

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Section: H 1743-322mentioning

confidence: 99%

Evidence of Outflow-induced Soft Lags of Galactic Black Holes

Patra

Chatterjee

Dutta

et al. 2019

ApJ

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“…GRS 1915+105 has been active since its discovery in 1992 (Castro-Tirado et al 1992) and has become one of the best studied Galactic BHBs. The source shows complex timing and spectral properties that are quite different from other BHBs (except for IGR J17091−3624, Altamirano et al 2011).…”

Section: Introductionmentioning

confidence: 99%

A systematic analysis of the phase lags associated with the type-C quasi-periodic oscillation in GRS 1915+105

Zhang

Méndez

Altamirano

et al. 2020

Monthly Notices of the Royal Astronomical Society

115

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We present a systematic analysis of the phase lags associated with the type-C QPOs in GRS 1915+105 using RXTE data. Our sample comprises of 620 RXTE observations with type-C QPOs ranging from ∼ 0.4 Hz to ∼ 6.3 Hz. Based on our analysis, we confirm that the QPO phase lags decrease with QPO frequency, and change sign from positive to negative at a QPO frequency of ∼ 2 Hz. In addition, we find that the slope of this relation is significantly different between QPOs below and above 2 Hz. The relation between the QPO lags and QPO rms can be well fitted with a broken line: as the QPO lags go from negative to positive, the QPO rms first increases, reaching its maximum at around zero lag, and then decreases. The phase-lag behaviour of the subharmonic of the QPO is similar to that of the QPO fundamental, where the subharmonic lags decrease with subharmonic frequency and change sign from positive to negative at a subharmonic frequency of ∼ 1 Hz; on the contrary, the second harmonic of the QPO shows a quite different phase-lag behaviour, where all the second harmonics show hard lags that remain more or less constant. For both the QPO and its (sub)harmonics, the slope of the lag-energy spectra shows a similar evolution with frequency as the average phase lags. This suggests that the lag-energy spectra drives the average phase lags. We discuss the possibility for the change in lag sign, and the physical origin of the QPO lags.

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“…At this precise location, an IR counterpart was reported (Mirabel et al 1993b, Castro-Tirado et al 1993, which was later confirmed by means of near-IR spectroscopy, showing variable, non Doppler-shifted emission lines, with the system suggested to be a low-mass X-ray binary (LMXB) (Castro-Tirado et al 1996), which was finally confirmed in 2001. See also Fig.…”

Section: The Discoverymentioning

confidence: 83%

GRS 1915+105 “celebrates its majority” (1992–2010)

Castro‐Tirado

2010

Proc. IAU

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Abstract. Over the 18 years since its discovery, GRS 1915+105 has continuously brightened in the X/γ-ray sky. It is considered the prototypical microquasar. Most of these are LMXBs that show sporadic ejection of matter at apparently superluminal velocities. In these the three basic ingredients of quasars are found: a black hole, an accretion disc and collimated jets of high energy particles, but in microquasars the black hole is only a few M instead of several × 10 6 M ; the accretion disc had mean thermal temperature of several × 10 6 K instead of several × 10 3 K, and the particles ejected at relativistic speeds travel distances of a few ly only, compared to few × 10 6 ly as in radio galaxies. However many open issues remain to be addressed.

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Multiwavelength observations of GRB afterglows

Cited by 16 publications

References 37 publications

Evidence of Outflow-induced Soft Lags of Galactic Black Holes

Evidence of Outflow-induced Soft Lags of Galactic Black Holes

A systematic analysis of the phase lags associated with the type-C quasi-periodic oscillation in GRS 1915+105

GRS 1915+105 “celebrates its majority” (1992–2010)

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