Diffuse neutrino intensity from the inner jets of active galactic nuclei: Impacts of external photon fields and the blazar sequence

被引：238

作者：

Murase, Kohta ^{[1
]}

Inoue, Yoshiyuki ^{[2
,3
,4
]}

Dermer, Charles D. ^{[5
]}

机构：

[1] Hubble Fellow Inst Adv Study, Princeton, NJ 08540 USA

[2] Stanford Univ, Dept Phys, Kavli Inst Particle Astrophys & Cosmol, Menlo Pk, CA 94025 USA

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[4] Japan Aerosp Explorat Agcy, JAXA ITY Fellow Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2525210, Japan

[5] Naval Res Lab, Space Sci Div, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 02期

关键词：

EXTRAGALACTIC BACKGROUND LIGHT; HIGH-ENERGY NEUTRINOS; GAMMA-RAY BURSTS; DEEP GALAXY COUNTS; X-RAY; COSMIC-RAYS; LUMINOSITY FUNCTION; RADIO; EMISSION; SPECTRUM;

D O I：

10.1103/PhysRevD.90.023007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study high-energy neutrino production in inner jets of radio-loud active galactic nuclei (AGN), taking into account effects of external photon fields and the blazar sequence. We show that the resulting diffuse neutrino intensity is dominated by quasar-hosted blazars, in particular, flat spectrum radio quasars, and that PeV-EeV neutrino production due to photohadronic interactions with broadline and dust radiation is unavoidable if the AGN inner jets are ultrahigh-energy cosmic-ray (UHECR) sources. Their neutrino spectrum has a cutoff feature around PeV energies since target photons are due to Ly alpha emission. Because of infrared photons provided by the dust torus, neutrino spectra above PeV energies are too hard to be consistent with the IceCube data unless the proton spectral index is steeper than 2.5, or the maximum proton energy is less than or similar to 100 PeV. Thus, the simple model has difficulty in explaining the IceCube data. For the cumulative neutrino intensity from blazars to exceed similar to 10(-8) GeV cm(-2) s(-1) sr(-1), their local cosmic-ray energy generation rate would be similar to 10-100 times larger than the local UHECR emissivity but is comparable to the averaged gamma-ray blazar emissivity. Interestingly, future detectors such as the Askaryan Radio Array can detect similar to 0.1-1 EeV neutrinos even in more conservative cases, allowing us to indirectly test the hypothesis that UHECRs are produced in the inner jets. We find that the diffuse neutrino intensity from radio-loud AGN is dominated by blazars with gamma-ray luminosity of greater than or similar to 10(48) erg s(-1), and the arrival directions of their similar to 1-100 PeV neutrinos correlate with the luminous blazars detected by Fermi.

引用

页数：18

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