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arXiv 2201.05888astro-ph.GAastro-ph.HE
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非喷流窄线Seyfert 1星系:SDSS J163401 .94+480940.1的夜间光学变率研究

Intra-night optical variability study of a non-jetted narrow-line Seyfert 1 galaxy: SDSS J163401.94+480940.1

Vineet Ojha

摘要:

SDSS J163401.94 $+$ 480940.2是一个没有喷流的射电大声窄线塞弗特1(NLSy1)星系。该物体的光学监测分两次夜间进行,每次$\geq$ 3小时,DOT为3.6米。夜间光学变率(INOV)的特性首次提出了这个源。我们在SDSS J163401.94 $+$ 480940.2的两个监测时段之一中探测到了一个意想不到的显著耀斑,其快速增亮阶段意味着$\sim$ 22分钟的分钟般倍增时间,从而接近FSRQ PKS 1222 $+$ 21在400 GeV观测到的极快的分钟般变化。一个分钟般的变化检测表明存在相对论射流与一个小视角。我们简要地讨论了在甚长基线阵列(VLBA)观测中未探测到相对论喷流的可能机制。

英文摘要:

SDSS J163401.94$+$480940.2 is a non-jetted radio-loud narrow-line Seyfert 1 (NLSy1) galaxy. Optical monitoring of this object was carried out in two intra-night sessions each $\geq$ 3 hrs with 3.6m DOT. Intra-night optical variability (INOV) characterization is presented for the first time for this source. We have detected an unexpected remarkable flare in one of two monitoring sessions of SDSS J163401.94$+$480940.2, whose rapid brightening phase implied a minute like doubling time of $\sim$ 22 minutes, thereby approaching to the extremely fast minute like variability, observed from FSRQ PKS 1222$+$21 at 400 GeV. The detection of a minute-like variability suggests the existence of relativistic jets with a small viewing angle. We briefly discuss the possible mechanisms for the non-detection of relativistic jets in its Very Long Baseline Array (VLBA) observations.

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