ULTRA-HIGH-ENERGY COSMIC RAYS FROM CENTAURUS A: JET INTERACTION WITH GASEOUS SHELLS

被引：24

作者：

Gopal-Krishna ^{[1
]}

Biermann, Peter L. ^{[2
,6
,7
,8
,9
]}

De Souza, Vitor ^{[3
]}

Wiita, Paul J. ^{[4
,5
]}

机构：

[1] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[2] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP, Brazil

[4] Coll New Jersey, Dept Phys, Ewing, NJ 08628 USA

[5] Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30302 USA

[6] Univ Bonn, Dept Phys & Astron, D-5300 Bonn, Germany

[7] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[8] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA

[9] Karlsruher Inst Technol, Dept Phys, Karlsruhe, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 720卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

acceleration of particles; galaxies: individual (Cen A); galaxies: ISM; galaxies: jets; radio continuum: galaxies; GALACTIC NUCLEI SOURCES; LARGE-SCALE STRUCTURE; ACCELERATION; EMISSION; DYNAMICS; SPECTRUM; DRIVEN; WIND; GAS;

D O I：

10.1088/2041-8205/720/2/L155

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ultra-high-energy cosmic rays (UHECRs), with energies above similar to 6 x 10(19) eV, seem to show a weak correlation with the distribution of matter relatively near to us in the universe. It has earlier been proposed that UHECRs could be accelerated in either the nucleus or the outer lobes of the nearby radio galaxy Cen A. We show that UHECR production at a spatially intermediate location about 15 kpc northeast from the nucleus, where the jet emerging from the nucleus is observed to strike a large star-forming shell of gas, is a plausible alternative. A relativistic jet is capable of accelerating lower energy heavy seed cosmic rays (CRs) to UHECRs on timescales comparable to the time it takes the jet to pierce the large gaseous cloud. In this model, many CRs arising from a starburst, with a composition enhanced in heavy elements near the knee region around PeV, are boosted to ultra-high energies by the relativistic shock of a newly oriented jet. This model matches the overall spectrum shown by the Auger data and also makes a prediction for the chemical composition as a function of particle energy. We thus predict an observable anisotropy in the composition at high energy in the sense that lighter nuclei should preferentially be seen toward the general direction of Cen A. Taking into consideration the magnetic field models for the Galactic disk and a Galactic magnetic wind, this scenario may resolve the discrepancy between HiRes and Auger results concerning the chemical composition of UHECRs.

引用

页码：L155 / L158

页数：4

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