论文标题
探测扁平频谱无线电类准4C+21.35的光子ALP振荡
Probing photon-ALP oscillations from the flat spectrum radio quasar 4C+21.35
论文作者
论文摘要
扁平频谱无线电类星体（FSRQ）是GEV能量上最发光的大弹药。在本文中，我们探测了最新的高能（VHE）$γ$ -RAY观测值FSRQ 4C+21.35（PKS 1222+216）的光子轴样粒子（ALP）振荡效应。 $γ$ - 射线光谱是由合作进行的主要大气伽马成像Cherenkov望远镜（魔术），非常有活力的辐射成像望远镜阵列系统（Veritas）和Fermi大面积望远镜（Fermi-lat），涵盖了两个活动的VHE flares flares of 4c+21.35 sed。零值和ALP假设下的阶段，并设置ALP参数空间的合并限制。 FSRQ 4C+21.35设置的95％$ \ rm C.L. $合并限制在$ M_A-G_ {Aγ} $平面中以魔术，Veritas和Fermi-lat测量的观测值大致在photon-alp coupling $ g_ {aγ} \ gtrsim 8 \ gtrsim 8 \ \ \ gm conphite-alp con alp质量$ [\，2 \ times 10^{ - 10} \，{\ rm ev} \ sillssim m_a \ sillsim 2 \ times 10^{ - 8} \，\ rm ev \，] $。与Fermi-lat设置的NGC 1275的约束相比，从FSRQ 4C+21.35中的光子ALP耦合$ g_ {Aγ} $得出的严格限制结果，而该结果可以稍微扩大低水量区域的ALP $ M_A $限制。
Flat spectrum radio quasar (FSRQ) is the most luminous blazar at the GeV energies. In this paper, we probe the photon-axion-like particle (ALP) oscillation effect on the latest very-high-energy (VHE) $γ$-ray observations of the FSRQ 4C+21.35 (PKS 1222+216). The $γ$-ray spectra are measured by the collaborations Major Atmospheric Gamma Imaging Cherenkov Telescopes (MAGIC), Very Energetic Radiation Imaging Telescope Array System (VERITAS), and Fermi Large Area Telescope (Fermi-LAT), which cover two activity VHE flares of 4C+21.35 in 2010 and 2014. We show the spectral energy distributions (SEDs) of these two phases under the null and ALP hypotheses, and set the combined limit on the ALP parameter space. The 95% $\rm C.L.$ combined limit set by the FSRQ 4C+21.35 observations measured by MAGIC, VERITAS, and Fermi-LAT in the $m_a-g_{aγ}$ plane is roughly at the photon-ALP coupling $g_{aγ} \gtrsim 8\times 10^{-12} \rm \, GeV^{-1}$ for the ALP mass $[\,2\times 10^{-10}\, {\rm eV} \lesssim m_a \lesssim 2\times 10^{-8}\, \rm eV\,]$. Compared with the constraint of NGC 1275 set by Fermi-LAT, no stringent limit result is derived with the photon-ALP coupling $g_{aγ}$ from the FSRQ 4C+21.35, while this result could slightly broaden the ALP mass $m_a$ limit at the low-mass region.
