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, J; Liang, EW; Zhang SN(张双南); Zhang, SN; Bai, JM
刊名	ASTROPHYSICAL JOURNAL
	2012
卷号	752 期号:2 页码:157
关键词	BL Lacertae objects: general gamma rays: galaxies radiation mechanisms: non-thermal
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
收录类别	SCI
WOS记录号	WOS:000305738000080
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224436]
专题	高能物理研究所_粒子天体物理中心
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):157.
APA	Zhang, J,Liang, EW,张双南,Zhang, SN,&Bai, JM.(2012).RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS.ASTROPHYSICAL JOURNAL,752(2),157.
MLA	Zhang, J,et al."RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS".ASTROPHYSICAL JOURNAL 752.2(2012):157.