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arXiv 2008.11941astro-ph.HE
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寻找LOTAAS类星体的$γ$射线辐射

Searching for $γ$-ray emission from LOTAAS pulsars

Qi-Wei Lu, Zhong-Xiang Wang, Yi Xing

摘要:

低频阵列(LOFAR)最近进行了一项调查(LOFAR捆绑阵列全天空调查; LOTAAS),发现了73个新的双星。为了研究这类双星的性质,我们利用费米伽马射线空间望远镜(Fermi Gamma Ray Space Telescope,简称Fermi)上的大区域望远镜(LAT)的全天巡天观测数据,寻找它们的$γ$射线对应物,分析了70颗LOTAAS双星的LAT数据(不包括两颗毫秒双星和一颗已知自旋周期最长的23.5s双星)。我们找到了PSRJ 1017 $+$ 30的一个候选对应物,一旦它的定时解可用,就应该搜索它以获得$γ$射线脉动信号。对于其它LOTAAS谱仪,我们导出了它们的0.3 - 500GeV通量上限。为了将LOTAAS双星与已知的$γ$射线双星进行比较,我们还计算了Fermi LAT第四源星表中112颗$γ$射线双星的0.3 - 500 GeV的通量,并根据$γ$射线双星的性质,计算了LOTAAS双星的自旋下降光度上限。上限不是很严格,但有助于说明大多数LOTAAS天体可能具有$< 10^{33}$ erg s $^{-1}$自旋向下的光度,并且不能用费米LAT探测到。

英文摘要:

The LOw-Frequency ARray (LOFAR) has recently conducted a survey (LOFAR Tied-Array All-sky Survey; LOTAAS) for pulsars in the Northern hemisphere that resulted in discoveries of 73 new pulsars. For the purpose of studying the properties of these pulsars, we search for their $γ$-ray counterparts using the all-sky survey data obtained with the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope (Fermi).We analyze the LAT data for 70 LOTAAS pulsars (excluding two millisecond pulsars and one with the longest known spin period of 23.5s). We find one candidate counterpart to PSRJ1017$+$30, which should be searched for the $γ$-ray pulsation signal once its timing solution is available. For other LOTAAS pulsars, we derive their 0.3--500GeV flux upper limits. In order to compare the LOTAAS pulsars with the known $γ$-ray pulsars, we also derive the 0.3--500GeV $γ$-ray fluxes for 112 of the latter contained in the Fermi LAT fourth source catalog.Based on the properties of the $γ$-ray pulsars, we derive upper limits on the spin-down luminosities of the LOTAAS pulsars. The upper limits are not very constraining but help suggest that most of the LOTAAS pulsars probably have $< 10^{33}$erg s$^{-1}$ spin-down luminosities and are not expected to be detectable with Fermi LAT.

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