On the origin and survival of ultra-high-energy cosmic-ray nuclei in gamma-ray bursts and hypernovae

Xiang Yu Wang, Soebur Razzaque, Peter Istvan Meszaros

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The chemical composition of the ultra-high-energy (UHE) cosmic rays serves as an important clue to their origin. Recent measurements of the elongation rates by the Pierre Auger Observatory hint at the possible presence of heavy or intermediate-mass nuclei in the UHE cosmic rays. Gamma-ray bursts (GRBs) and hypernovae have been suggested as possible sources of the UHE cosmic rays. Here we derive constraints on the physical conditions under which UHE heavy nuclei, if they are accelerated in these sources, can survive in their intense photon fields. We find that in the GRB external shock and hypernova scenarios, UHE nuclei can easily survive photodisintegration. In the GRB internal shock scenario, UHE nuclei can also survive, provided the dissipation radius and/or the bulk Lorentz factor of the relativistic outflow are relatively large, or if the low-energy self-absorption break in the photon spectrum of the prompt emission occurs above several keV. In internal shocks and in the other scenarios, intermediate-mass UHE nuclei have a higher probability of survival against photodisintegration than UHE heavy nuclei such as Fe.

Original languageEnglish (US)
Pages (from-to)432-440
Number of pages9
JournalAstrophysical Journal
Volume677
Issue number1
DOIs
StatePublished - Apr 10 2008

Fingerprint

gamma ray bursts
cosmic ray
cosmic rays
nuclei
energy
shock
heavy nuclei
self absorption
photons
elongation
dissipation
observatories
chemical composition
outflow
observatory
radii

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Space and Planetary Science

Cite this

Wang, Xiang Yu ; Razzaque, Soebur ; Meszaros, Peter Istvan. / On the origin and survival of ultra-high-energy cosmic-ray nuclei in gamma-ray bursts and hypernovae. In: Astrophysical Journal. 2008 ; Vol. 677, No. 1. pp. 432-440.
@article{d687266c0c374e0ebc59cc9ba6d31a89,
title = "On the origin and survival of ultra-high-energy cosmic-ray nuclei in gamma-ray bursts and hypernovae",
abstract = "The chemical composition of the ultra-high-energy (UHE) cosmic rays serves as an important clue to their origin. Recent measurements of the elongation rates by the Pierre Auger Observatory hint at the possible presence of heavy or intermediate-mass nuclei in the UHE cosmic rays. Gamma-ray bursts (GRBs) and hypernovae have been suggested as possible sources of the UHE cosmic rays. Here we derive constraints on the physical conditions under which UHE heavy nuclei, if they are accelerated in these sources, can survive in their intense photon fields. We find that in the GRB external shock and hypernova scenarios, UHE nuclei can easily survive photodisintegration. In the GRB internal shock scenario, UHE nuclei can also survive, provided the dissipation radius and/or the bulk Lorentz factor of the relativistic outflow are relatively large, or if the low-energy self-absorption break in the photon spectrum of the prompt emission occurs above several keV. In internal shocks and in the other scenarios, intermediate-mass UHE nuclei have a higher probability of survival against photodisintegration than UHE heavy nuclei such as Fe.",
author = "Wang, {Xiang Yu} and Soebur Razzaque and Meszaros, {Peter Istvan}",
year = "2008",
month = "4",
day = "10",
doi = "10.1086/529018",
language = "English (US)",
volume = "677",
pages = "432--440",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

On the origin and survival of ultra-high-energy cosmic-ray nuclei in gamma-ray bursts and hypernovae. / Wang, Xiang Yu; Razzaque, Soebur; Meszaros, Peter Istvan.

In: Astrophysical Journal, Vol. 677, No. 1, 10.04.2008, p. 432-440.

Research output: Contribution to journalArticle

TY - JOUR

T1 - On the origin and survival of ultra-high-energy cosmic-ray nuclei in gamma-ray bursts and hypernovae

AU - Wang, Xiang Yu

AU - Razzaque, Soebur

AU - Meszaros, Peter Istvan

PY - 2008/4/10

Y1 - 2008/4/10

N2 - The chemical composition of the ultra-high-energy (UHE) cosmic rays serves as an important clue to their origin. Recent measurements of the elongation rates by the Pierre Auger Observatory hint at the possible presence of heavy or intermediate-mass nuclei in the UHE cosmic rays. Gamma-ray bursts (GRBs) and hypernovae have been suggested as possible sources of the UHE cosmic rays. Here we derive constraints on the physical conditions under which UHE heavy nuclei, if they are accelerated in these sources, can survive in their intense photon fields. We find that in the GRB external shock and hypernova scenarios, UHE nuclei can easily survive photodisintegration. In the GRB internal shock scenario, UHE nuclei can also survive, provided the dissipation radius and/or the bulk Lorentz factor of the relativistic outflow are relatively large, or if the low-energy self-absorption break in the photon spectrum of the prompt emission occurs above several keV. In internal shocks and in the other scenarios, intermediate-mass UHE nuclei have a higher probability of survival against photodisintegration than UHE heavy nuclei such as Fe.

AB - The chemical composition of the ultra-high-energy (UHE) cosmic rays serves as an important clue to their origin. Recent measurements of the elongation rates by the Pierre Auger Observatory hint at the possible presence of heavy or intermediate-mass nuclei in the UHE cosmic rays. Gamma-ray bursts (GRBs) and hypernovae have been suggested as possible sources of the UHE cosmic rays. Here we derive constraints on the physical conditions under which UHE heavy nuclei, if they are accelerated in these sources, can survive in their intense photon fields. We find that in the GRB external shock and hypernova scenarios, UHE nuclei can easily survive photodisintegration. In the GRB internal shock scenario, UHE nuclei can also survive, provided the dissipation radius and/or the bulk Lorentz factor of the relativistic outflow are relatively large, or if the low-energy self-absorption break in the photon spectrum of the prompt emission occurs above several keV. In internal shocks and in the other scenarios, intermediate-mass UHE nuclei have a higher probability of survival against photodisintegration than UHE heavy nuclei such as Fe.

UR - http://www.scopus.com/inward/record.url?scp=42549142977&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=42549142977&partnerID=8YFLogxK

U2 - 10.1086/529018

DO - 10.1086/529018

M3 - Article

VL - 677

SP - 432

EP - 440

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -