在最短时间尺度上研究耀星变率的新方法及其在 S5 1803+784 上的应用

IF 10.2 4区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Journal of High Energy Astrophysics Pub Date : 2024-11-12 DOI:10.1016/j.jheap.2024.11.008

M.S. Butuzova, V.A. Guseva, M.A. Gorbachev, A.S. Krivenko, S.V. Nazarov

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引用次数: 0

摘要

我们提出了一种新方法，用于研究从几小时到几天的时间尺度上炽星亮度变化特性的演变。这种方法的精髓在于沿着整个光变曲线探测连续定位的时间间隔，在这些时间间隔内，可以利用结构函数确定变率的特征时间。我们将这种方法应用于 TESS 任务提供的持续数天的统一数据序列，该数据序列来自于炽星 S5 1803+784。然后，我们将发现的变率时间参数与 B-、V-、R-和 I-光度观测数据结合起来进行分析。发现变率的振幅和特征时间之间存在相关性。这些值与辐射光谱指数的关系尚未揭示。我们的结论是，短时间尺度上的变化是由于光学发射区不同体积部分的多普勒因子不同而形成的。同时，辐射光谱也略微偏离了幂律。

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A new method for studying the blazar variability on the shortest time scales and its application to S5 1803+784

We propose a new method for investigating the evolution of the properties of the blazar brightness variability on timescales from a few hours to a few days. Its essence lies in detecting sequentially located time intervals along the entire light curve, within which it is possible to determine the characteristic time of variability using the structure function. We applied this method to uniform data series lasting several days provided by the TESS mission for blazar S5 1803+784. Then, we analyzed the found time parameters of variability coupled with the data of B-, V-, R-, and I-photometric observations. A correlation was found between the amplitude and the characteristic time of variability. The relation of these values with the spectral index of radiation has not been revealed. We conclude that the variability on a short time scale is formed due to the different Doppler factors for having different volume parts of the optical emitting region. At the same time, the radiation spectrum deflects slightly from the power-law.

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来源期刊

Journal of High Energy Astrophysics Earth and Planetary Sciences-Space and Planetary Science

CiteScore

9.70

自引率

5.30%

发文量

审稿时长

65 days

期刊介绍： The journal welcomes manuscripts on theoretical models, simulations, and observations of highly energetic astrophysical objects both in our Galaxy and beyond. Among those, black holes at all scales, neutron stars, pulsars and their nebula, binaries, novae and supernovae, their remnants, active galaxies, and clusters are just a few examples. The journal will consider research across the whole electromagnetic spectrum, as well as research using various messengers, such as gravitational waves or neutrinos. Effects of high-energy phenomena on cosmology and star-formation, results from dedicated surveys expanding the knowledge of extreme environments, and astrophysical implications of dark matter are also welcomed topics.