Possible Evidence for Cosmic-Ray Acceleration in the Type Ia SNR RCW 86: Spatial Correlation between TeV Gamma-Rays and Interstellar Atomic Protons

被引:19
作者
Sano, H. [1 ,2 ]
Rowell, G. [3 ]
Reynoso, E. M. [4 ]
Jung-Richardt, I. [5 ]
Yamane, Y. [2 ]
Nagaya, T. [2 ]
Yoshiike, S. [2 ]
Hayashi, K. [2 ]
Torii, K. [6 ]
Maxted, N. [7 ]
Mitsuishi, I. [2 ]
Inoue, T. [2 ]
Inutsuka, S. [2 ]
Yamamoto, H. [2 ]
Tachihara, K. [2 ]
Fukui, Y. [1 ,2 ]
机构
[1] Nagoya Univ, Inst Adv Res, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan
[2] Nagoya Univ, Dept Phys, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan
[3] Univ Adelaide, Sch Phys Sci, North Terrace, Adelaide, SA 5005, Australia
[4] UBA, CONICET, IAFE, Ave Int Guraldes 2620,Pabellon IAFE,Ciudad Univ, Buenos Aires, DF, Argentina
[5] Univ Erlangen Nurnberg, Phys Inst, Erwin Rommel Str 1, D-91058 Erlangen, Germany
[6] Natl Inst Nat Sci, Nobeyama Radio Observ, Natl Astron Observ Japan, Minamisa Ku, 462-2 Nobeyama, Nagano 3841305, Japan
[7] Univ New South Wales, Australian Def Force Acad, Sch Sci, Canberra, ACT 2600, Australia
基金
澳大利亚研究理事会;
关键词
cosmic rays; gamma rays: ISM; ISM: clouds; ISM: individual objects (RCW 86); ISM: supernova remnants; MAGNETIC-FIELD AMPLIFICATION; MOLECULAR CLOUDS; PARTICLE-ACCELERATION; SUZAKU OBSERVATION; EMISSION; GAS; DISCOVERY; REMNANTS; STAR;
D O I
10.3847/1538-4357/ab108f
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a detailed morphological study of TeV gamma-rays, synchrotron radiation, and interstellar gas in the young Type Ia supernova remnant (SNR) RCW 86. We find that the interstellar atomic gas shows good spatial correlation with the gamma-rays, indicating that the TeV gamma-rays from RCW 86 are likely predominantly of hadronic origin. In contrast, the spatial correlation between the interstellar molecular cloud and the TeV gamma-rays is poor in the southeastern shell of the SNR. We argue that this poor correlation can be attributed to the low-energy cosmic rays (similar to 1 TeV) not penetrating into the dense molecular cloud due to an enhancement of the turbulent magnetic field around the dense cloud of similar to 10-100 mu G. We also find that the southwestern shell, which is bright in both synchrotron X-ray and radio continuum radiation, shows a significant gamma-ray excess compared with the interstellar proton column density, suggesting that leptonic gamma-rays via inverse Compton scattering possibly contribute alongside the hadronic gamma-rays. The total cosmic-ray energies of the young TeV gamma-ray SNRs-RX J1713.7-3946, Vela Jr, HESS J1731-347, and RCW 86-are roughly similar, which indicates that cosmic rays can be accelerated in both the core-collapse and Type Ia supernovae. The total energy of cosmic rays derived using the gas density, similar to 10(48)-10(49) erg, gives a safe lower limit due mainly to the low filling factor of interstellar gas within the shell.
引用
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页数:13
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