Late-time observations of the relativistic tidal disruption flare candidate Swift J1112.2−8238

Brown, Gordon G.; Levan, A. J.; Stanway, Elizabeth R.; Krühler, T.; Tanvir, N. R.; Davies, Luke J. M.; Fruchter, A. S.; Cenko, S. Bradley; Metzger, Brian D.

doi:10.1093/mnras/stx2193

Cited by 28 publications

(21 citation statements)

References 92 publications

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“…In the model, the luminosity produced within the accretion disk is necessarily exhausted anisotropically from the ZEBRA through bipolar jets owing to the supercritical nature of the accretion. In agreement with this condition, the three TDEs so far observed that display jetted activity -Swift J1644+57 (e.g., Bloom et al 2011), Swift 20158+05 (Cenko et al 2012, and Swift J1112 (Brown et al 2015(Brown et al , 2017) -were likely accreting at a super-Eddington rate. In particular, J1644 and J1112 were associated with black holes of respective mass M h 3 × 10 6 M (Levan et al 2016) and M h 5 × 10 6 M (Brown et al 2015), and though there are uncertainties related to the beaming factors of the jets (the isotropic luminosities were well above the Eddington limit for these SMBHs), the luminosities of those systems were likely super-Eddington by factors of at least 10-100.…”

Section: Discussionmentioning

confidence: 54%

Super-Eddington accretion in tidal disruption events: the impactof realistic fallback rates on accretion rates

Coughlin

Nixon

2018

Monthly Notices of the Royal Astronomical Society

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After the tidal disruption of a star by a massive black hole, disrupted stellar debris can fall back to the hole at a rate significantly exceeding its Eddington limit. To understand how black hole mass affects the duration of super-Eddington accretion in tidal disruption events, we first run a suite of simulations of the disruption of a Solarlike star by a supermassive black hole of varying mass to directly measure the fallback rate onto the hole, and we compare these fallback rates to the analytic predictions of the "frozen-in" model. Then, adopting a Zero-Bernoulli Accretion flow as an analytic prescription for the accretion flow around the hole, we investigate how the accretion rate onto the black hole evolves with the more accurate fallback rates calculated from the simulations. We find that numerically-simulated fallback rates yield accretion rates onto the hole that can, depending on the black hole mass, be nearly an order of magnitude larger than those predicted by the frozen-in approximation. Our results place new limits on the maximum black hole mass for which super-Eddington accretion occurs in tidal disruption events.

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Section: Discussionmentioning

confidence: 54%

Super-Eddington accretion in tidal disruption events: the impactof realistic fallback rates on accretion rates

Coughlin

Nixon

2018

Monthly Notices of the Royal Astronomical Society

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“…Radio emission has been observed from only 6 TDE's so far. In all of the jetted TDE events, like the aforementioned Sw J1644+57 and Sw J2058+05, as well as Sw J1112.2 (Brown et al 2017), 5GHz radio luminosities of 10 40 − 10 42 erg s −1 have been observed. In these events, the radio emission, like the X-ray emission, is thought to arise from the relativistic jets that are oriented toward our line of sight.…”

Section: Cygnus A-2 As a Tdementioning

confidence: 87%

Evidence for a TDE origin of the radio transient Cygnus A-2

Vries

Wise

Nulsen

et al. 2019

Monthly Notices of the Royal Astronomical Society

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In 2015, a radio transient named Cygnus A-2 was discovered in Cygnus A with the Very Large Array. Because of its radio brightness (νF ν ≈ 6×10 39 erg s −1 ), this transient likely represents a secondary black hole in orbit around the AGN. Using Chandra ACIS observations from 2015 to 2017, we have looked for an X-ray counterpart to Cygnus A-2. The separation of 0.42 arcsec means that Cygnus A-2 can not be spatially resolved, but by comparing the data with simulated marx data, we put an upper limit to the 2-10 keV X-ray luminosity of Cygnus A-2 of 1 × 10 43 erg s −1 . Using the Fundamental Plane for accreting black holes, we find that our upper limit to the X-ray flux of Cygnus A-2 in 2015-2017 disfavours the interpretation of Cygnus A-2 as a steadily accreting black hole. We suggest instead that Cygnus A-2 is the radio afterglow of a tidal disruption event (TDE), and that a peak in the 2-10 keV luminosity of the nuclear region in 2013, when it was observed by Swift and NuSTAR, is X-ray emission from the TDE. A TDE could naturally explain the X-ray light curve of the nuclear region, as well as the appearance of a short-lived, fast, and ionized outflow previously detected in the 2013 NuSTAR spectrum. Both the radio and X-ray luminosities fall in between typical luminosities for 'thermal' and 'jetted' TDE types, suggesting that Cygnus A-2 would be unlike previously seen TDE's.

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“…Bloom et al 2011;Burrows et al 2011;Levan et al 2011); Swift J2058+0516 (e.g. Cenko et al 2012;Pasham et al 2015) and Swift J1112.2−8238 (Brown et al 2015(Brown et al , 2017. In all three cases, the sources showed bright, rapidly variable and long lasting X-ray emission (brighter than commonly seen in ther-⋆ E-mail: K.Wiersema@warwick.ac.uk mal spectrum TDEs), and a bright radio counterpart.…”

Section: Introductionmentioning

confidence: 93%

Polarimetry of relativistic tidal disruption event Swift J2058+0516

Wiersema

Higgins

Levan

et al. 2019

Monthly Notices of the Royal Astronomical Society

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A small fraction of candidate tidal disruption events (TDEs) show evidence of powerful relativistic jets, which are particularly pronounced at radio wavelengths, and likely contribute non-thermal emission at a wide range of wavelengths. A non-thermal emission component can be diagnosed using linear polarimetry, even when the total received light is dominated by emission from an accretion disk or disk outflow. In this paper we present Very Large Telescope (VLT) measurements of the linear polarisation of the optical light of jetted TDE Swift J2058+0516. This is the second jetted TDE studied in this manner, after Swift J1644+57. We find evidence of non-zero optical linear polarisation, P V ∼ 8%, a level very similar to the near-infrared polarimetry of Swift J1644+57. These detections provide an independent test of the emission mechanisms of the multiwavelength emission of jetted tidal disruption events.

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Late-time observations of the relativistic tidal disruption flare candidate Swift J1112.2−8238

Cited by 28 publications

References 92 publications

Super-Eddington accretion in tidal disruption events: the impactof realistic fallback rates on accretion rates

Super-Eddington accretion in tidal disruption events: the impactof realistic fallback rates on accretion rates

Evidence for a TDE origin of the radio transient Cygnus A-2

Polarimetry of relativistic tidal disruption event Swift J2058+0516

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