Timing analysis of the black hole candidate EXO 1846-031 with Insight-HXMT monitoring

Abstract

We present the observational results from a detailed timing analysis of the black hole candidate EXO 1846-031 during its outburst in 2019 with the observations of Insight-HXMT, NICER and MAXI. This outburst can be classfied roughly into four different states. Type-C quasi-periodic oscillations (QPOs) observed by NICER (about 0.1-6Hz) and Insight-HXMT (about 0.7-8Hz) are also reported in this work. Meanwhile, we study various physical quantities related to QPO frequency.The QPO rms-frequency relationship in three energy band 1-10 keV indicates that there is a turning pointing in frequency around 2 Hz,which is similar to that of GRS 1915+105. A possible hypothesis for the relationship above may be related to the inclination of the source, which may require a high inclination to explain it. The relationships between QPO frequency and QPO rms,hardness,total fractional rms and count rate have also been found in other transient sources, which can indicate that the origin of type-C QPOs is non-thermal.

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Cited by in corpus (9)

• A detailed view of low-frequency quasi-periodic oscillation in the broadband 0.2-200 keV with Insight-HXMT and NICER
• Insight-HXMT Study of the Inner Accretion Disk in the Black Hole Candidate EXO 1846--031
• The accretion flow geometry of MAXI J1820+070 through broadband noise research with Insight-HXMT
• Radio observations of the Black Hole X-ray Binary EXO 1846-031 re-awakening from a 34-year slumber
• Timing Analysis of a New Black Hole Candidate MAXI J1803-298 with Insight-HXMT and NICER
• High energy Millihertz quasi-periodic oscillations in 1A 0535+262 with Insight-HXMT challenge current models
• Accretion Flow Properties of EXO 1846-031 During its Multi-Peaked Outburst After Long Quiescence
• Evolution of QPOs in GX 339-4 and EXO 1846-031 with Insight-HXMT and NICER
• Impact of reflection Comptonization on X-ray reflection spectroscopy: the case of EXO 1846-031