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arXiv 2103.09158astro-ph.HEgr-qc
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GRB 180720 B的X射线和GeV余辉及sub-TeV发射

X-ray and GeV afterglows and sub-TeV emission of GRB 180720B

R. Moradi, Liang Li, J. A. Rueda, R. Ruffini, N. Sahakyan, Y. Wang

摘要:

GRB 180720 B,由{PDMATHAMM Fermi}-GBM观测到,具有红移PDMATHAMN,各向同性能量PDMATHAMO erg,以及由尼尔·盖尔斯·斯威夫特卫星上的XRT观测到的X射线余辉,在这里被归类为双星驱动的超新星I(BdHN I)。BdHN I是长伽玛暴,其双星祖先由一个碳氧核(CO $_{\rm core}$)和一个轨道周期为$\sim 5$ min的中子星(NS)伴星组成。CO $_{\rm core}$的引力坍缩在其中心产生一颗超新星(SN)和一颗新的中子星($ν$ NS)。SN超临界吸积到伴星NS上,引发其引力坍缩,形成黑洞(BH)。BH视界附近的电动过程导致了具有幂律光度$L_{\rm GeV}\propto t^{-1.19\pm0.04}$的长时间GeV发射,由BH旋转能提供动力。相应地,我们确定了BH的质量和自旋。$ν$ NS通过其脉冲状发射和回退吸积将能量注入磁化的SN喷出物中,产生同步辐射。这就解释了\textit{long-lasting} X射线余辉与幂律光度$L_X \propto t^{-1.48\pm 0.32}$,由$ν$ NS旋转能量激励。我们将其应用于GRB 180720 B,确定$ν$ NS磁场和自旋。我们还分析了高能立体系统(H.E.S.S.)观测到的GRB 180720 B发射,在$100$-$440$ GeV能量下,在Fermi-GBM触发后h,$10.1$-$12.1$。我们建议,这\textit{short-term}辐射的能量$2.4\times 10^{50}$尔格和持续时间$\sim 10^3$ s,是由一个"毛刺"事件,突然注入相对论电子到$ν$ NS磁层在其减速阶段。

英文摘要:

GRB 180720B, observed by {\it Fermi}-GBM, with redshift $z=0.653$, isotropic energy $E_{\rm iso}=5.92\times 10^{53}$ erg, and X-ray afterglow observed by the XRT onboard the Neil Gehrels Swift satellite, is here classified as a Binary-driven Hypernova I (BdHN I). BdHN I are long GRBs with a binary progenitor composed of a carbon-oxygen core (CO$_{\rm core}$) and a neutron star (NS) companion with orbital period $\sim 5$ min. The gravitational collapse of the CO$_{\rm core}$ generates a supernova (SN) and a new NS ($ν$NS) at its center. The SN hypercritical accretion onto the companion NS triggers its gravitational collapse forming a black hole (BH). An electrodynamical process near the BH horizon leads to the long-lasting GeV emission with power-law luminosity $L_{\rm GeV}\propto t^{-1.19\pm0.04}$, powered by the BH rotational energy. Correspondingly, we determine the BH mass and spin. The $ν$NS via its pulsar-like emission and fallback accretion injects energy into the magnetized SN ejecta generating synchrotron radiation. This explains the \textit{long-lasting} X-ray afterglow with power-law luminosity $L_X \propto t^{-1.48\pm 0.32}$, energized by the $ν$NS rotational energy. We apply this to GRB 180720B determining the $ν$NS magnetic field and spin. We also analyze the GRB 180720B emission observed by the High-Energy Stereoscopic System (H.E.S.S.), at $100$-$440$ GeV energies, $10.1$-$12.1$ h after the Fermi-GBM trigger. We propose that this \textit{short-term} radiation of energy $2.4\times 10^{50}$ erg and duration $\sim 10^3$ s, is powered by a "glitch" event that suddenly injects relativistic electrons into the $ν$NS magnetosphere during its slowing down phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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