A Cocoon of Freshly Accelerated Cosmic Rays Detected by Fermi in the Cygnus Superbubble

被引：2

作者：

Grenier, Isabelle A. ^{[1
,2
]}

Tibaldo, Luigi ^{[3
]}

机构：

[1] Univ Paris Diderot, CNRS, CEA Saclay, Lab AIM,CEA Irfu, F-91191 Gif Sur Yvette, France

[2] Inst Univ France, Gif Sur Yvette, France

[3] Stanford Univ, SLAC Natl Accelerator Lab, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

来源：

CENTENARY SYMPOSIUM 2012: DISCOVERY OF COSMIC RAYS | 2013年 / 1516卷

基金：

瑞典研究理事会;

关键词：

cosmic rays; OB associations; superbubble; gamma rays; GALAXY; ORIGIN;

D O I：

10.1063/1.4792578

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Conspicuous stellar clusters, with high densities of massive stars, powerful stellar winds, and intense UV flux, have formed over the past few million years in the large molecular clouds of the Cygnus X region, 1.4 kpc away from the Sun. By capturing the gamma-ray signal of young cosmic rays spreading in the interstellar medium surrounding the clusters, the Fermi Large Area Telescope (LAT) has confirmed the long-standing hypothesis that massive-star forming regions host cosmic-ray factories. The 50-pc wide cocoon of energetic particles appears to fill the interstellar cavities carved by the stellar activity. The cocoon provides a first test case to study the impact of wind-powered turbulence on the early phases of cosmic-ray diffusion (between the sources and the Galaxy at large) and to study the acceleration potential of this type of superbubble environment for in-situ cosmic-ray production or to energize Galactic cosmic rays passing by.

引用

页码：250 / 253

页数：4

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