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A Narrow Short-Duration GRB Jet from a Wide Central Engine. (arXiv:1505.05538v1 [astro-ph.HE])

May 22nd, 2015

Paul C. Duffell, Eliot Quataert, Andrew I. MacFadyen

We use two-dimensional relativistic hydrodynamic numerical calculations to
show that highly collimated relativistic jets can be produced in neutron star
merger models of short-duration gamma ray bursts without the need for a highly
directed engine or a large net magnetic flux. Even a hydrodynamic engine
generating a very wide sustained outflow on small scales can in principle
produce a highly collimated relativistic jet, facilitated by a dense
surrounding medium which provides a cocoon surrounding the jet core. An oblate
geometry to the surrounding gas significantly enhances the collimation process.
Previous numerical simulations have shown that the merger of two neutron stars
produces an oblate, expanding cloud of dynamical ejecta. We show that this gas
can efficiently collimate the central engine power much as the surrounding star
does in long-duration GRB models. For typical short-duration GRB central engine
parameters, we find jets with opening angles of order 10 degrees in which a
large fraction of the total outflow power of the central engine resides in
highly relativistic material. These results predict large differences in the
opening angles of outflows from binary neutron star mergers versus neutron
star-black hole mergers.


http://arxiv.org/abs/1505.05538


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Synchrotron Origin of the Typical GRB Band Function - A Case Study of GRB 130606B. (arXiv:1505.05858v1 [astro-ph.HE])

May 22nd, 2015


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Constraints on the Bulk Lorentz Factors of GRB X-Ray Flares. (arXiv:1505.04233v1 [astro-ph.HE])

May 19th, 2015


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Super-solar metallicity at the position of the ultra-long GRB130925A. (arXiv:1505.04415v1 [astro-ph.GA])

May 19th, 2015


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Probing the Cosmic Gamma-Ray Burst Rate with Trigger Simulations of the Swift Burst Alert Telescope. (arXiv:1311.4567v3 [astro-ph.HE] UPDATED)

May 19th, 2015


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GRB 140606B / iPTF14bfu: Detection of shock-breakout emission from a cosmological gamma-ray burst?. (arXiv:1505.03522v1 [astro-ph.HE])

May 16th, 2015


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A Tight $L_{\rm p, iso}-E'_{\rm p}-\Gamma_0$ Correlation of Gamma-Ray Bursts. (arXiv:1505.03660v1 [astro-ph.HE])

May 16th, 2015


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GRB 140606B / iPTF14bfu: Detection of shock-breakout emission from a cosmological gamma-ray burst?. (arXiv:1505.03522v1 [astro-ph.SR])

May 15th, 2015


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A Tight $L_{\rm p, iso}-E'_{\rm p}-\Gamma_0$ Correlation of Gamma-Ray Bursts. (arXiv:1505.03660v1 [astro-ph.HE])

May 15th, 2015


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Thermal Emissions Spanning the Prompt and the Afterglow Phase of the Ultra-long GRB 130925A. (arXiv:1505.03296v1 [astro-ph.HE])

May 14th, 2015


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