INTERGALACTIC MAGNETIC FIELDS AND GAMMA-RAY OBSERVATIONS OF EXTREME TeV BLAZARS

被引:49
作者
Arlen, Timothy C. [1 ]
Vassilev, Vladimir V. [1 ]
Weisgarber, Thomas [2 ]
Wakely, Scott P. [2 ]
Shafi, S. Yusef [3 ]
机构
[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[2] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
[3] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA
基金
美国国家科学基金会;
关键词
cosmic background radiation; gamma rays: general; large-scale structure of universe; magnetic fields; methods: numerical; radiation mechanisms: non-thermal; EXTRAGALACTIC BACKGROUND LIGHT; SPITZER-SPACE-TELESCOPE; ACTIVE GALACTIC NUCLEI; DIGITAL SKY SURVEY; COSMIC VOIDS; 1ES 0229+200; DATA RELEASE; LOWER-LIMIT; PAIR HALOS; ENERGY;
D O I
10.1088/0004-637X/796/1/18
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The intergalactic magnetic field (IGMF) in cosmic voids can be indirectly probed through its effect on electromagnetic cascades initiated by a source of teraelectronvolt (TeV) gamma-rays, such as active galactic nuclei (AGNs). AGNs that are sufficiently luminous at TeV energies, "extreme TeV blazars", can produce detectable levels of secondary radiation from inverse Compton scattering of the electrons in the cascade, provided that the IGMF is not too large. We review recent work in the literature that utilizes this idea to derive constraints on the IGMF for three TeV-detected blazars, 1ES 0229+200, 1ES 1218+304, and RGB J0710+591, and we also investigate four other hard-spectrum TeV blazars in the same framework. Through a recently developed, detailed, three-dimensional particle-tracking Monte Carlo code, incorporating all major effects of QED and cosmological expansion, we research the effects of major uncertainties, such as the spectral properties of the source, uncertainty in the ultraviolet and far-infrared extragalactic background light, undersampled very high energy (energy >= 100 GeV) coverage, past history of gamma-ray emission, source versus observer geometry, and the jet AGN Doppler factor. The implications of these effects on the recently reported lower limits of the IGMF are thoroughly examined to conclude that the presently available data are compatible with a zero-IGMF hypothesis.
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页数:18
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