The Galactic Center: A Petaelectronvolt Cosmic-ray Acceleration Factory

doi:10.3847/1538-4357/aa5f58

IHEP OpenIR > 粒子天体物理中心

	The Galactic Center: A Petaelectronvolt Cosmic-ray Acceleration Factory
	Guo YQ(郭义庆); Tian Z(田珍); Wang Z(王振); Guo, YQ; Tian, Z; Wang, Z; Li, HJ; Chen, TL
	2017
发表期刊	ASTROPHYSICAL JOURNAL (IF:5.533[JCR-2016],5.342[5-Year])
ISSN	0004-637X
EISSN	1538-4357
卷号	836 期号:2 页码:233
文章类型	Article
摘要	The multiteraelectronvolt gamma-rays from the galactic center (GC) have a cutoff at tens of teraelectronvolts, whereas the diffuse emission has no such cutoff, which is regarded as an indication of petaelectronvolt proton acceleration by the HESS experiment. It is important to understand the inconsistency and study the possibility that petaelectronvolt cosmic-ray acceleration could account for the apparently contradictory point and diffuse gamma-ray spectra. In this work, we propose that the cosmic rays are accelerated up to greater than petaelectronvolts in the GC. The interaction between cosmic rays and molecular clouds is responsible for the multiteraelectronvolt gamma-ray emissions from both the point and diffuse sources today. Enhanced by the small volume filling factor (VFF) of the clumpy structure, the absorption of the gamma-rays leads to a sharp cutoff spectrum at tens of teraelectronvolts produced in the GC. Away from the GC, the VFF grows, and the absorption enhancement becomes negligible. As a result, the spectra of gamma-ray emissions for both point and diffuse sources can be successfully reproduced under such a self-consistent picture. In addition, a "surviving tail" at similar to 100 TeV is expected from the point source, which can be observed by future projects CTA and LHAASO. Neutrinos are simultaneously produced during proton-proton (PP) collision. With 5-10 years of observations, the KM3Net experiment will be able to detect the petaelectronvolt source according to our calculation.
关键词	cosmic rays Galaxy: center
DOI	10.3847/1538-4357/aa5f58
关键词[WOS]	ENERGY GAMMA-RAYS ; SGR A-ASTERISK ; INTERSTELLAR RADIATION-FIELD ; CIRCUMNUCLEAR DISK ; SAGITTARIUS-A ; NEUTRAL-GAS ; BLACK-HOLE ; FLARE ; LUMINOSITY ; EMISSION
收录类别	SCI ; SCOPUS ; ADS ; INSPIREHEP
语种	英语
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000401169200001
ADS Bibcode	2017ApJ...836..233G
ADS URL	https://ui.adsabs.harvard.edu/abs/2017ApJ...836..233G
ADS引文	https://ui.adsabs.harvard.edu/abs/2017ApJ...836..233G/citations
AXRIV号	164
INSPIRE ID	1452780
INSPIRE URL	https://inspirehep.net/record/1452780
引用统计	正在获取... 被引频次：17 [ADS]
文献类型	期刊论文
条目标识符	https://ir.ihep.ac.cn/handle/311005/284279
专题	粒子天体物理中心实验物理中心
作者单位	中国科学院高能物理研究所
第一作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Guo YQ,Tian Z,Wang Z,et al. The Galactic Center: A Petaelectronvolt Cosmic-ray Acceleration Factory[J]. ASTROPHYSICAL JOURNAL,2017,836(2):233.
APA	郭义庆.,田珍.,王振.,Guo, YQ.,Tian, Z.,...&Chen, TL.(2017).The Galactic Center: A Petaelectronvolt Cosmic-ray Acceleration Factory.ASTROPHYSICAL JOURNAL,836(2),233.
MLA	郭义庆,et al."The Galactic Center: A Petaelectronvolt Cosmic-ray Acceleration Factory".ASTROPHYSICAL JOURNAL 836.2(2017):233.