IMPLICATIONS OF PLASMA BEAM INSTABILITIES FOR THE STATISTICS OF THE FERMI HARD GAMMA-RAY BLAZARS AND THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND

被引：25

作者：

Broderick, Avery E. ^{[1
,2
]}

Pfrommer, Christoph ^{[3
]}

Puchwein, Ewald ^{[3
]}

Chang, Philip ^{[4
]}

机构：

[1] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[2] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[3] Heidelberg Inst Theoret Studies, D-69118 Heidelberg, Germany

[4] Univ Wisconsin, Dept Phys, Milwaukee, WI 53211 USA

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 790卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

BL Lacertae objects: general; gamma rays: diffuse background; gamma rays: general; infrared: diffuse background; plasmas; radiation mechanisms: non-thermal; ACTIVE GALACTIC NUCLEI; OPTICAL LUMINOSITY EVOLUTION; LARGE-AREA TELESCOPE; COSMOLOGICAL IMPACT; SIMPLIFIED VIEW; COSMIC VOIDS; PAIR BEAMS; RADIO; LIGHT; SPECTRA;

D O I：

10.1088/0004-637X/790/2/137

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fermi has been instrumental in constraining the luminosity function and redshift evolution of gamma-ray bright BL Lac objects, a subpopulation of blazars with almost featureless optical spectra. This includes limits on the spectrum and anisotropy of the extragalactic gamma-ray background (EGRB), redshift distribution of nearby Fermi active galactic nuclei (AGNs), and the construction of a log N-log S relation. Based on these, it has been argued that the evolution of the gamma-ray bright BL Lac population must be much less dramatic than that of other AGNs. However, critical to such claims is the assumption that inverse Compton cascades reprocess emission above a TeV into the Fermi energy range, substantially enhancing the strength of the observed limits. Here we demonstrate that in the absence of such a process, due, e.g., to the presence of virulent plasma beam instabilities that preempt the cascade, a population of TeV-bright BL Lac objects that evolve similarly to quasars is consistent with the population of hard gamma-ray BL Lac objects observed by Fermi. Specifically, we show that a simple model for the properties and luminosity function is simultaneously able to reproduce their log N-log S relation, local redshift distribution, and contribution to the EGRB and its anisotropy without any free parameters. Insofar as the naturalness of a picture in which the hard gamma-ray BL Lac population exhibits the strong redshift evolution observed in other tracers of the cosmological history of accretion onto halos is desirable, this lends support for the absence of the inverse Compton cascades and the existence of the beam plasma instabilities.

引用

页数：17

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