RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS

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	RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS
	Zhang, J1,2 ; Liang, EW3 ; Zhang, SN 1,4; Bai JM(白金明)5,6
刊名	ASTROPHYSICAL JOURNAL
	2012-06-20
卷号	752 期号:2
关键词	BL Lacertae objects: general gamma rays: galaxies radiation mechanisms: non-thermal
ISSN号	0004-637X
通讯作者	Zhang, J (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
产权排序	第五完成单位
英文摘要	BL Lac objects are the best candidates to study the jet properties since their spectral energy distributions (SEDs) are less contaminated by the emission from the accretion disk and external Compton processes. We compile the broadband SEDs observed with Fermi/LAT and other instruments from literature for 24 TeV BL Lac objects. Two SEDs, which are identified as a low or high state according to its flux density at 1 TeV, are available for each of 10 objects. These SEDs can be explained well with the synchrotron+synchrotron-self-Compton model. We constrain the magnetic field strength (B) and the Doppler factor (delta) of the radiation region by incorporating the chi(2)-minimization technique and the gamma-ray transparency condition. Twenty-four out of the 34 SEDs can constrain B and delta in the 1 sigma significance level, and others only present the limits for both B and delta. The typical values of B and delta are 0.1-0.6 G and 10-35, respectively. The derived values of gamma(b) are significantly different among sources and even among the low and high states of a given source. Prominent flux variations with a clear spectral shift are observed, and a tentative correlation between the ratio of the flux density at 1 TeV and the ratio of gamma(b) in the low and high states is presented, likely indicating that the relativistic shocks for the electron acceleration may be responsible for the flux variations and the spectral shift. A weak anti-correlation between the jet power and the mass of the central black hole is observed, i.e., P-jet proportional to M-BH(-1), which disfavors the scenario of a pure accretion-driven jet. Implications for the blazar sequence and the intergalactic magnetic field from our results are also briefly discussed.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY EMISSION ; ACTIVE GALACTIC NUCLEI ; SIMULTANEOUS MULTIWAVELENGTH OBSERVATIONS ; COMPLEX SPECTRAL VARIABILITY ; SUPERMASSIVE BLACK-HOLES ; FERMI BRIGHT BLAZARS ; LARGE-AREA TELESCOPE ; X-RAY ; MAGNETIC-FIELDS ; 1ES 2344+514
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/752/2/157/meta
语种	英语
WOS记录号	WOS:000305738000080
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5421]
专题	云南天文台_丽江天文观测站（南方基地）云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 2.College of Physics and Electronic Engineering, Guangxi Teachers Education University, Nanning 530001, China 3.Department of Physics and GXU-NAOC, Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China 4.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 5.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式 GB/T 7714	Zhang, J,Liang, EW,Zhang, SN,et al. RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS[J]. ASTROPHYSICAL JOURNAL,2012,752(2).
APA	Zhang, J,Liang, EW,Zhang, SN,&Bai JM.(2012).RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS.ASTROPHYSICAL JOURNAL,752(2).
MLA	Zhang, J,et al."RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS".ASTROPHYSICAL JOURNAL 752.2(2012).