The radiative efficiency of relativistic jet and wind: A case study of GRB 070110

Abstract

A rapidly spinning, strongly magnetized neutron star is invoked as the central engine for some Gamma-ray bursts (GRBs), especially, the $"$internal plateau$"$ feature of X-ray afterglow. However, for these $"$internal plateau$"$ GRBs, how to produce their prompt emission remains an open question. Two different physical process have been proposed in the literature, (1) a new-born neutron star is surrounded by a hyper-accreting and neutrino cooling disk, the GRB jet can be powered by neutrino annihilation aligning the spin axis; (2) a differentially rotating millisecond pulsar was formed due to different angular velocity between the interior core and outer shell parts of the neutron star, which can power an episodic GRB jet. In this paper, by analyzing the data of one peculiar GRB 070110 (with internal plateau), we try to test which model being favored. By deriving the physical parameters of magnetar with observational data, the parameter regime for initial period ($P_0$) and surface polar cap magnetic field ($B_{\mathrm{p}}$) of the central NS are $(0.96\sim 1.2)\mathrm{ms}$ and $(2.4\sim 3.7)\times 10^{14}\mathrm{G}$, respectively. The radiative efficiency of prompt emission is about ${\eta }_{\gamma }\sim 6\%$. However, the radiative efficiency of internal plateau (${\eta }_{\mathrm{X}}$) is larger than $31\%$ assuming the $M_{\mathrm{NS}}\sim 1.4M_{\odot }$ and $P_0\sim 1.2\mathrm{ms}$. The clear difference between the radiation efficiencies of prompt emission and internal plateau implies that they maybe originated from different components (e.g. prompt emission from the relativistic jet powered by neutrino annihilation, while the internal plateau from the magnetic outflow wind).

5 pages, 2 figures. 1 Table, Accepted for publication in MNRAS

References in corpus (12)

• The Physics of Gamma-Ray Bursts and Relativistic Jets
• The Internal-Collision-Induced Magnetic Reconnection and Turbulence (ICMART) Model of Gamma-Ray Bursts
• Gamma-Ray Bursts: Progress, Problems & Prospects
• Short Duration Gamma-Ray Bursts with Extended Emission from Proto-Magnetar Spin-Down
• X-Ray Flares from Postmerger Millisecond Pulsars
• A Comprehensive Analysis of the Swift/XRT Data: II. Diverse Physical Origins of the Shallow Decay Segment
• The Millisecond Magnetar Central Engine in short GRBs
• The X-ray afterglow flat segment in short GRB 051221A: Energy injection from a millisecond magnetar?
• Hyper-accreting black hole as GRB central engine. I: Baryon loading in GRB jets
• Magnetically Torqued Neutrino-Dominated Accretion Flows for Gamma-ray Bursts
• Hyperaccreting Neutron-Star Disks and Neutrino Annihilation
• Hyperaccretion Disks around Neutron Stars

Cited by in corpus (9)

• Magnetar central engine and possible gravitational wave emission of nearby short GRB 160821B
• Signature of a New-Born Black Hole from the Collapse of a Supra-massive Millisecond Magnetar
• What can we learn from "internal plateaus"? The peculiar afterglow of GRB 070110
• Magnetar as Central Engine of Gamma-Ray Bursts: Central Engine-Jet Connection, Wind-Jet Energy Partition, and Origin of Some Ultra-Long Bursts
• Early Evolution of a Newborn Magnetar with Strong Precession Motion in GRB 180620A
• Comparison of the Characteristics of Magnetars Born in Death of Massive Stars and Merger of Compact Objects With {\em Swift} Gamma-Ray Burst Data
• Early Optical Observations of GRB 150910A: Bright Jet Optical Afterglow and X-ray Dipole Radiation from a Magnetar Central Engine
• To power the X-ray plateaus of gamma-ray bursts through larger amplitude electromagnetic waves
• Magnetar as Central Engine of Gamma-Ray Bursts: Quasi-Universal Jet, Event Rate and X-ray Luminosity Function of Dipole Radiations