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

	RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS
	Zhang, Jin1,2 ; Liang, En-Wei 3,4; Zhang, Shuang-Nan 1,5; Bai, J. M.6,7
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
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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000305738000080
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6187]
专题	国家天文台_空间科学研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Guangxi Teachers Educ Univ, Coll Phys & Elect Engn, Nanning 530001, Peoples R China 3.Guangxi Univ, Ctr Astrophys & Space Sci, GXU NAOC, Nanning 530004, Peoples R China 4.Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China 5.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 6.Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China 7.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Jin,Liang, En-Wei,Zhang, Shuang-Nan,et al. RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS[J]. ASTROPHYSICAL JOURNAL,2012,752(2).
APA	Zhang, Jin,Liang, En-Wei,Zhang, Shuang-Nan,&Bai, J. M..(2012).RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS.ASTROPHYSICAL JOURNAL,752(2).
MLA	Zhang, Jin,et al."RADIATION MECHANISMS AND PHYSICAL PROPERTIES OF GeV-TeV BL Lac OBJECTS".ASTROPHYSICAL JOURNAL 752.2(2012).