A new variability pattern in GRS 1915+105 with NICER and Insight-HXMT observations

Author:

Shi Zhihong12ORCID,Wu Qingwen2ORCID,Yan Zhen3ORCID,Lyu Bing4ORCID,Liu Hao5

Affiliation:

1. Department of Physics, The University of Hong Kong , Pokfulam Road, Hong Kong , China

2. School of Physics, Huazhong University of Science and Technology , 1037 Luoyu Road, Wuhan 430074 , China

3. Shanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030 , China

4. Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871 , China

5. University of Science and Technology of China , No.96, JinZhai Road Baohe District, Hefei, Anhui 230026 , China

Abstract

ABSTRACT We explore the timing and spectral properties of GRS 1915+105 based on X-ray observations of NICER and Insight-HXMT during the long outburst from 2017 to 2021. We find a new class of variability in the rising stage of the outburst that differs from the formerly reported patterns of light curves. This new variability pattern, which we name class ψ, is characterized by several periodic mini pulses superposed on another longer periodic pulse. The periods are ∼130 and ∼10 s for the main pulses and mini pulses, respectively, based on the analysis of power spectrum density and step-wise filter correlation (SFC), where the SFC method has an advantage in finding the superimposed periodic components. The mini pulses become weak or disappear when the luminosity increases and the light curves change into the classical class κ. The class ψ shows a softer spectrum with lower count rates compared to the class κ during the main pulse. The new class ψ shows peculiar timing and spectral properties compared to those of classic class κ, which can help us to explore the class transition mechanism in GRS 1915+105.

Funder

National Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Insight-HXMT Research Progress Since 2023;Chinese Journal of Space Science;2024

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