Investigating Possible Correlations between Gamma-Ray and Optical Lightcurves for TeV-Detected Northern Blazars over 8 Years of Observations
Investigating Possible Correlations between Gamma-Ray and Optical Lightcurves for TeV-Detected Northern Blazars over 8 Years of Observations
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DOI：
10.3390/galaxies11040081
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发表时间：
2023-07
期刊：
影响因子：
2.5
通讯作者：
A. Acharyya;A. Sadun
中科院分区：
文献类型：
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作者：
A. Acharyya;A. Sadun
Blazar是活动星系核(AGN)的一个子类，在我们的视线范围内有几度排列的相对论喷流，构成了TeV系统中探测到的大部分AGN。费米大面积望远镜(LAT)是一种对转换望远镜，对能量在20 MeV到2TeV之间的光子很敏感，能够每三个小时扫描整个伽马射线天空。尽管费米任务取得了显著的成功，但许多问题仍然没有得到回答，例如伽马射线产生的地点和涉及的发射机制。小行星对地撞击最后警报系统(ATLAS)是一种高节奏的全天探测系统，旨在有效地发现潜在危险的小行星，以及跟踪和搜索高度可变和瞬变源，如活动星系核。在这项研究中，我们研究了在2015年至2022年8年的观测中，在100 MeV-300GeV能区的费米-LAT观测与以679 nm为中心的R波段的ATLAS光学数据之间的可能相关性。在假设光学耀斑和伽马射线耀斑是由沿喷流向下传播的同一次爆发产生的假设下，对某些源发现的强烈关联表明了辐射的单区轻子模型。
Blazars are a subclass of active galactic nuclei (AGN) having relativistic jets aligned within a few degrees of our line-of-sight and form the majority of the AGN detected in the TeV regime. The Fermi-Large Area Telescope (LAT) is a pair-conversion telescope, sensitive to photons having energies between 20 MeV and 2 TeV, and is capable of scanning the entire gamma-ray sky every three hours. Despite the remarkable success of the Fermi mission, many questions still remain unanswered, such as the site of gamma-ray production and the emission mechanisms involved. The Asteroid Terrestrial-impact Last Alert System (ATLAS) is a high cadence all sky survey system optimized to be efficient for finding potentially dangerous asteroids, as well as in tracking and searching for highly variable and transient sources, such as AGN. In this study, we investigate possible correlations between the Fermi-LAT observations in the 100 MeV–300 GeV energy band and the ATLAS optical data in the R-band, centered at 679 nm, for a sample of 18 TeV-detected northern blazars over 8 years of observations between 2015 and 2022. Under the assumption that the optical and gamma-ray flares are produced by the same outburst propagating down the jet, the strong correlations found for some sources suggest a single-zone leptonic model of emission.