Probing blackbody components in gamma-ray bursts from black hole neutrino-dominated accretion flows

TL;DR

This paper investigates whether neutrino annihilation in black hole accretion flows can explain blackbody components observed in gamma-ray bursts, supporting the NDAF model with observational data.

Contribution

It provides observational evidence that supports the neutrino annihilation process in NDAFs as the origin of blackbody components in GRBs.

Findings

Most GRBs' accretion rates and black hole properties are consistent with NDAF predictions.

The observed blackbody components can be explained by neutrino annihilation in NDAFs.

Supports the NDAF model as a viable central engine for GRBs.

Abstract

A stellar-mass black hole (BH) surrounded by a neutrino-dominated accretion flow (NDAF) is generally considered to be the central engine of gamma-ray bursts (GRBs). Neutrinos escaping from the disk will annihilate out of the disk to produce the fireball that could power GRBs with blackbody (BB) components. The initial GRB jet power and fireball launch radius are related to the annihilation luminosity and annihilation height of the NDAFs, respectively. In this paper, we collect 7 GRBs with known redshifts and identified BB components to test whether the NDAF model works. We find that, in most cases, the values of the accretion rates and the central BH properties are all in the reasonable range, suggesting that these BB components indeed originate from the neutrino annihilation process.