Suwa 2010 伽马暴的喷流可以穿过第一代恒星的包层

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Title:		Can Gamma-Ray Burst Jets Break Out the First Stars?
Authors:		Suwa, Yudai; Ioka, Kunihito
Publication:		eprint arXiv:1009.6001
Publication Date:		09/2010
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Comment:		19 pages, 2 figures
Bibliographic Code:		2010arXiv1009.6001S

Abstract

We show that a relativistic gamma-ray burst (GRB) jet can potentially pierce the envelope of very massive first generation star (Population III; Pop III) by using the stellar density profile to estimate both the jet luminosity (via accretion) and its penetrability. The jet breakout is possible even if the Pop III star has a supergiant hydrogen envelope without mass loss, thanks to the long-lived powerful accretion of the envelope itself. While the Pop III GRB is estimated to be energetic $E_{\gamma,\mathrm{iso}}\sim 10^{55}$ erg, the supergiant envelope hides the initial bright phase into the cocoon component, leading to a GRB with a long duration $\sim 1000(1+z)$ sec and an ordinary isotropic luminosity $\sim 10^{52}$ erg s$^{-1}$ ($\sim 10^{-9}$ erg cm$^{-2}$ s$^{-1}$ at redshift $z\sim 20$). The neutrino-annihilation is not effective for Pop III GRBs because of a low central temperature, while the magnetic mechanism is viable. We also derive analytic estimates of the breakout conditions, which are applicable to various progenitor models. The GRB luminosity and duration are found to be very sensitive to the core and envelope mass, providing possible probes of the first luminous objects at the end of the high redshift dark ages.

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