Ultra-high energy neutrino fluxes from supermassive AGN black holes
详细信息 查看全文
- 作者：G. Ter-Kazarian (1)
- 关键词：Galaxies ; Black holes ; Neutrinos ; Cosmic rays
- 刊名：Astrophysics and Space Science
- 出版年：2014
- 出版时间：February 2014
- 年：2014
- 卷：349
- 期：2
- 页码：919-938
- 全文大小：726 KB
- 作者单位：G. Ter-Kazarian (1)
1. Byurakan Astrophysical Observatory, Byurakan, 378433, Aragatsotn District, Armenia - ISSN：1572-946X
文摘
We compute the ultra-high energy (UHE) neutrino fluxes from plausible accreting supermassive black holes closely linking to the 377 active galactic nuclei (AGNs). They have well-determined black hole masses collected from the literature. The neutrinos are produced via simple or modified URCA processes, even after the neutrino trapping, in superdense proto-matter medium. The resulting fluxes are ranging from: (1)?(quark reactions)-span class="a-plus-plus inline-equation id-i-eq1"> $J^{q}_{\nu\varepsilon}/(\varepsilon_{d}\ \mathrm{erg}\,\mathrm{cm}^{-2}\,\mathrm{s}^{-1}\,\mathrm{sr}^{-1})\simeq8.29\times 10^{-16}$ to 3.18×10?, with the average $\overline{J}^{q}_{\nu\varepsilon}\simeq5.53\times 10^{-10}\varepsilon_{d}\ \mathrm{erg}\,\mathrm{cm}^{-2}\,\mathrm{s}^{-1}\,\mathrm{sr}^{-1}$ , where ε d ?0?2 is the opening parameter; (2)?(pionic reactions)-span class="a-plus-plus inline-equation id-i-eq3"> $J^{\pi}_{\nu\varepsilon} \simeq0.112J^{q}_{\nu\varepsilon}$ , with the average $J^{\pi}_{\nu\varepsilon} \simeq3.66\times 10^{-11}\varepsilon_{d}\ \mathrm{erg}\,\mathrm{cm}^{-2}\,\mathrm{s}^{-1}\,\mathrm{sr}^{-1}$ ; and (3)?(modified URCA processes)-span class="a-plus-plus inline-equation id-i-eq5"> $J^{URCA}_{\nu\varepsilon}\simeq7.39\times10^{-11} J^{q}_{\nu\varepsilon}$ , with the average $\overline{J}^{URCA}_{\nu\varepsilon} \simeq2.41\times10^{-20} \varepsilon_{d}\ \mathrm{erg}\,\mathrm{cm}^{-2}\,\mathrm{s}^{-1}\,\mathrm{sr}^{-1}$ . We conclude that the AGNs are favored as promising pure neutrino sources, because the computed neutrino fluxes are highly beamed along the plane of accretion disk, peaked at high energies and collimated in smaller opening angle θ?em class="a-plus-plus">ε d .