QUASI-PERIODIC VARIATIONS IN X-RAY EMISSION AND LONG-TERM RADIO OBSERVATIONS: EVIDENCE FOR A TWO-COMPONENT JET IN Sw J1644+57

Wang, Jiu-Zhou; Lei, Wei‐Hua; Wang, Ding-Xiong; Zou, Yuan‐Chuan; Zhang, Bing; Huang, Chang‐Yin

doi:10.1088/0004-637x/788/1/32

Cited by 37 publications

(30 citation statements)

References 63 publications

(120 reference statements)

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“…The combined MM and radio observations extending to ∼ 200 days show clearly two components of the light curves (see § 3.1 and Fig. 2), indicating that the jet is structured (Berger et al 2012;Wang et al 2014;Liu, Pe'er & Loeb 2015).…”

Section: Detections Of Tdes With Existing Observationsmentioning

confidence: 87%

“…However, we note from The model parameters are given in Table 2. These parameters are somewhat different from those in Wang et al (2014), because of the likelihood fitting technique adopted in this work. Note, however, these parameters are only a set of representative ones which can describe the data, because of strong degeneracies of the model parameters.…”

Section: On-axis Tdesmentioning

confidence: 96%

“…The jet-CNM interaction generates shocks to accelerate electrons (or even cosmic rays) which radiate via synchrotron and/or inverse Compton scattering, giving rise to the so-called afterglow emission. The evolution of a jet during the propagation in the CNM includes roughly three (Wang et al 2014), compared with the observational data (Berger et al 2012;Zauderer et al 2013). Horizontal lines show the sensitivities of the LMT and ALMA at different bands (Table 3).…”

Section: On-axis Tdesmentioning

confidence: 99%

“…A two-component jet model has been developed by Wang et al (2014), to explain the complex multi-wavelength light curves of Sw J1644+57. We use a similar but improved version of the model to fit the multi-wavelength and multi-epoch data (Berger et al 2012;Zauderer et al 2013).…”

Section: On-axis Tdesmentioning

confidence: 99%

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Catching jetted tidal disruption events early in millimetre

Yuan

Wang

Lei

et al. 2016

Mon. Not. R. Astron. Soc.

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Relativistic jets can form from at least some tidal disruption events (TDEs) of (sub-)stellar objects around supermassive black holes. We detect the millimeter (MM) emission of IGR J12580+0134 -the nearest TDE known in the galaxy NGC 4845 at the distance of only 17 Mpc, based on Planck all-sky survey data. The data show significant flux jumps after the event, followed by substantial declines, in all six high frequency Planck bands from 100 GHz to 857 GHz. We further show that the evolution of the MM flux densities are well consistent with our model prediction from an off-axis jet, as was initially suggested from radio and X-ray observations. This detection represents the second TDE with MM detections; the other is Sw J1644+57, an on-axis jetted TDE at redshift of 0.35. Using the on-and off-axis jet models developed for these two TDEs as templates, we estimate the detection potential of similar events with the Large Millimeter Telescope (LMT) and the Atacama Large Millimeter/submillimeter Array (ALMA). Assuming an exposure of one hour, we find that the LMT (ALMA) can detect jetted TDEs up to redshifts z ∼ 1 (2), for a typical disrupted star mass of ∼ 1 M ⊙ . The detection rates of on-and off-axis TDEs can be as high as ∼ 0.6 (13) and 10 (220) per year, respectively, for the LMT (ALMA). We briefly discuss how such observations, together with follow-up radio monitoring, may lead to major advances in understanding the jetted TDEs themselves and the ambient environment of the CNM.

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Section: Detections Of Tdes With Existing Observationsmentioning

confidence: 87%

Section: On-axis Tdesmentioning

confidence: 96%

Section: On-axis Tdesmentioning

confidence: 99%

Section: On-axis Tdesmentioning

confidence: 99%

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Catching jetted tidal disruption events early in millimetre

Yuan

Wang

Lei

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Recently, three unusual TDE candidates have been discovered by Swift, i.e., Swift J164449.3+573451, Swift J2058.4+0516, and Swift J1112.2-8238 (hereafter Sw J1644+57, Sw J2058 +05, and Sw J1112-82 for short, respectively), which have very bright nonthermal hard X-ray and radio emissions (Bloom et al 2011;Burrows et al 2011;Krimm et al 2011aKrimm et al , 2011bZauderer et al 2011;Cenko et al 2012;Brown et al 2015). The luminous nonthermal X-ray and radio emissions are thought to be produced by relativistic jets (Bloom et al 2011;Burrows et al 2011;Levan et al 2011;Zauderer et al 2011;Cao & Wang 2012;Metzger et al 2012;Wang et al 2014;Liu et al 2015). Sw J1644+57 shows a highly variable light curve in X-rays, as observed by the X-ray Telescope on board Swift.…”

Section: Introductionmentioning

confidence: 99%

Search for High-Energy Gamma-Ray Emission From Tidal Disruption Events With the Fermi Large Area Telescope

Peng

Tang

Wang

2016

ApJ

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Massive black holes at galaxy center may tear apart a star when the star passes occasionally within the disruption radius, which is the so-called tidal disruption event (TDE). Most TDEs radiate with thermal emission resulting from the acceleration disk, but three TDEs have been detected in bright nonthermal X-ray emission, which is interpreted as arising from the relativistic jets. A search for high-energy gamma-ray emission from one relativistic TDE (Swift J164449.3+573451) with the Fermi Large Area Telescope (LAT) has yielded nondetection. In this paper, we report the search for high-energy emission from the other two relativistic TDEs (Swift J2058.4+0516 and Swift J1112.2-8238) during the flare period. No significant GeV emission is found, with an upper limit fluence in the LAT energy range being less than 1% of that in X-rays. Compared with gamma-ray bursts and blazars, these TDEs have the lowest flux ratio between GeV emission and X-ray emission. The nondetection of high-energy emission from relativistic TDEs could be due to the fact that the high-energy emission is absorbed by soft photons in the source. Based on this hypothesis, upper limits on the bulk Lorentz factors,  G 30, are then obtained for the jets in these TDEs. We also search for high-energy gamma-ray emission from the nearest TDE discovered to date, ASASSN-14li. No significant GeV emission is found, and an upper limit of ( -) Ĺ 0.1 10 GeV 4.4 10 42 erg s −1(at 95% confidence level) is obtained for the first 10 7 s after the disruption.

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Tidal disruption of stars by supermassive black holes: Status of observations

Komossa

2015

Journal of High Energy Astrophysics

368

295

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Stars in the immediate vicinity of supermassive black holes (SMBHs) can be ripped apart by the tidal forces of the black hole. The subsequent accretion of the stellar material causes a spectacular flare of electromagnetic radiation. Here, we provide a review of the observations of tidal disruption events (TDEs), with an emphasis on the important contributions of Swift to this field. TDEs represent a new probe of matter under strong gravity, and have opened up a new window into studying accretion physics under extreme conditions. The events probe relativistic effects, provide a new means of measuring black hole spin, and represent signposts of intermediate-mass BHs, binary BHs and recoiling BHs. Luminous, high-amplitude X-ray flares, matching key predictions of the tidal disruption scenario, have first been discovered with ROSAT, and more recently with other missions and in other wavebands. The Swift discovery of two γ -ray emitting, jetted TDEs, never seen before, has provided us with a unique probe of the early phases of jet formation and evolution, and Swift J1644+75 has the best covered lightcurve of any TDE to date. Further, Swift has made important contributions in providing well-covered lightcurves of TDEs discovered with other instruments, setting constraints on the physics that govern the TDE evolution, and including the discovery of the first candidate binary SMBH identified from a TDE lightcurve.

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QUASI-PERIODIC VARIATIONS IN X-RAY EMISSION AND LONG-TERM RADIO OBSERVATIONS: EVIDENCE FOR A TWO-COMPONENT JET IN Sw J1644+57

Cited by 37 publications

References 63 publications

Catching jetted tidal disruption events early in millimetre

Catching jetted tidal disruption events early in millimetre

Search for High-Energy Gamma-Ray Emission From Tidal Disruption Events With the Fermi Large Area Telescope

Tidal disruption of stars by supermassive black holes: Status of observations

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