Vertical Convection in Neutrino-Dominated Accretion Flows

Liu, Tong; Gu, Wei‐Min; Kawanaka, Norita; Li, Ang

doi:10.1088/0004-637x/805/1/37

Cited by 21 publications

(30 citation statements)

References 58 publications

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“…For example, Liu et al (2015a) presented that the vertical convection can suppress the radial advection, which effectively increase the neutrino emission rate. Moreover, Liu et al (2010) investigated the vertical structure of the NDAF model.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Testing black hole neutrino-dominated accretion discs for long-duration gamma-ray bursts

Song¹,

Liu²,

Gu³

et al. 2016

Mon. Not. R. Astron. Soc.

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Long-duration gamma-ray bursts (LGRBs) are generally considered to originate from the massive collapsars. It is believed that the central engine of gamma-ray bursts (GRBs) is a neutrino-dominated accretion flow (NDAF) around a rotating stellar-mass black hole (BH). The neutrino annihilation above the NDAF is a feasible mechanism to power GRB. In this work, we analyse the distributions of the isotropic gammaray radiated energy and jet kinetic energy of 48 LGRBs. According to the NDAF and fireball models, we estimate the mean accreted masses of LGRBs in our sample to investigate whether the NDAFs can power LGRBs with the reasonable BH parameters and conversion efficiency of neutrino annihilation. The results indicate that most of the values of the accreted masses are less than 5 M ⊙ for the extreme Kerr BHs and high conversion efficiency. It suggests that the NDAFs may be suitable for most ofLGRBs except for some extremely high energy sources.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Testing black hole neutrino-dominated accretion discs for long-duration gamma-ray bursts

Song¹,

Liu²,

Gu³

et al. 2016

Mon. Not. R. Astron. Soc.

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“…(i) The discovery of the X-ray afterglow (GRB 970228, Costa et al (1997)), characterized by an X-ray luminosity decreasing with a power-law with index of α X = −1.48 ± 0.32 (see de Pasquale et al 2006, as well as Li et al 2015;Pisani et al 2016;Li et al 2018b). In this article, we specifically address the astrophysical origin of the afterglow.…”

Section: The Largest Ever Multi-wavelength Observational Effortsmentioning

confidence: 99%

“…Thanks to the Swift satellite, the number of detected GRBs increased rapidly to 1300 sources with known redshifts (see, e.g., Giommi et al 2020). By analyzing the light-curve of some long GRBs, Nousek et al (2006) and Zhang et al (2006) discovered three power-law segments in the XRT flux light curves prior to the afterglow emission(see, also, Li et al 2015;Li et al 2018a). We refer in this article to these segments as the "Nousek-Zhang power-laws".…”

Section: The Largest Ever Multi-wavelength Observational Effortsmentioning

confidence: 99%

The morphology of the X-ray afterglows and of the jetted GeV emission in long GRBs

Ruffini,

Moradi,

Rueda

et al. 2021

Preprint

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We recall evidence that long gamma-ray bursts (GRBs) have binary progenitors and give new examples. Binary-driven hypernovae (BdHNe) consist of a carbon-oxygen core (CO core ) and a neutron star (NS) companion. For binary periods ∼ 5 min, the CO core collapse originates the subclass BdHN I characterized by: 1) an energetic supernova (the "SN-rise"); 2) a black hole (BH), born from the NS collapse by SN matter accretion, leading to a GeV emission with luminosity L GeV = A GeV t −α GeV , observed only in some cases; 3) a new NS (νNS), born from the SN, originating the X-ray afterglow with L X = A X t −α X , observed in all BdHN I. We record 378 sources and present for four prototypes GRBs 130427A, 160509A, 180720B and 190114C: 1) spectra, luminosities, SN-rise duration; 2) A X , α X = 1.48 ± 0.32, and 3) the νNS spin time-evolution. We infer a) A GeV , α GeV = 1.19 ± 0.04; b) the BdHN I morphology from time-resolved spectral analysis, three-dimensional simulations, and the GeV emission presence/absence in 54 sources within the Fermi-LAT boresight angle. For 25 sources, we give the integrated and time-varying GeV emission, 29 sources have no GeV emission detected and show X/gamma-ray flares previously inferred as observed along the binary plane. The 25/54 ratio implies the GeV radiation is emitted within a cone of half-opening angle ≈ 60 • from the normal to the orbital plane. We deduce BH masses 2.3-8.9 M and spin 0.27-0.87 by explaining the GeV emission from the BH energy extraction, while their time evolution validates the BH mass-energy formula.

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“…We can estimate V ann by integrating the region of θ < θ 0 and r < r out . Thus we can obtain the proportionality constant of the efficiency to the volume above the disk as a function of accretion rate from the vertically-integrated NDAF model where θ 0 corresponds to π/2 (Liu et al 2007(Liu et al , 2015a. Figure 16 displays the neutrino luminosity L ν and annihilation luminosity L νν as a function ofṁ.…”

Section: Convectionmentioning

confidence: 99%

“…Similar to the above discussion, one can calculate along with the evolution of the BH mass and spin, the relations between the neutrino annihilation energy E νν and T 90 by using the analytic formula of Zalamea & Beloborodov (2011) withṁ ign <ṁ <ṁ trap , i.e., where t s = t/(1 s). Figure 19(a) displays the individual neutrino annihilation energy of the SGRB data in Liu et al (2015a) compared with the typical theoretical lines. All curves correspond to the initial value of BH mass m 0 = 2.3, conversion factor ε = 0.3, and typical redshift z = 0.5, and all the lines are truncated at the disk mass m disk = 0.5.…”

Section: Evolution Of Ndafs For Grbsmentioning

confidence: 99%

Neutrino-dominated accretion flows as the central engine of gamma-ray bursts

Liu

Zhang

2017

New Astronomy Reviews

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111

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Neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black holes (BHs) are plausible candidates for the central engines of gamma-ray bursts (GRBs). NDAFs are hyperaccretion disks with accretion rates in the range of around 0.001-10 M ⊙ s −1 , which have high density and temperature and therefore are extremely optically thick and geometrically slim or even thick. We review the theoretical progresses in studying the properties of NDAFs as well as their applications to the GRB phenomenology. The topics include: the steady radial and vertical structure of NDAFs and the implications for calculating neutrino luminosity and annihilation luminosity, jet power due to neutrino-antineutrino annihilation and Blandford-Znajek mechanism and their dependences on parameters such as BH mass, spin, and accretion rate, time evolution of NDAFs, effect of magnetic fields, applications of NDAF theories to the GRB phenomenology such as lightcurve variability, extended emission, X-ray flares, kilonovae, etc., as well as probing NDAFs using multi-messenger signals such as MeV neutrinos and gravitational waves.

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Vertical Convection in Neutrino-Dominated Accretion Flows

Cited by 21 publications

References 58 publications

Testing black hole neutrino-dominated accretion discs for long-duration gamma-ray bursts

Testing black hole neutrino-dominated accretion discs for long-duration gamma-ray bursts

The morphology of the X-ray afterglows and of the jetted GeV emission in long GRBs

Neutrino-dominated accretion flows as the central engine of gamma-ray bursts

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