6 papers
Energy-dependent Optical/Near-infrared and X-ray Correlations in Swift J1727.8-1613
Ruican Ma, Federico Vincentelli, Diego Altamirano +5
We present a timing analysis of the black hole transient Swift J1727.8-1613 during its intermediate state. We use coordinated broadband X-ray observations from Insight-HXMT (2-150…
Discovery of a quasi-periodic oscillation non-harmonically related to the Type-C QPO in the hard intermedidate state of MAXI J1820+070
Pei Jin, Mariano Méndez, Federico GarcÃa +2
We present a detailed timing analysis of the transition from the hard-intermediate state (HIMS) to the soft-intermediate state (SIMS) in MAXI J1820+070 using NICER observations. Th…
Multiwavelength Analysis of the Einstein Probe X-ray Transient EP240305a
Ruican Ma, Ye Li, Lian Tao +32
We report multiwavelength observations of EP240305a, an uncatalogued X-ray transient detected by the Einstein Probe on March 5, 2024. The source exhibits distinct characteristics a…
Unveiling hidden millihertz quasi-periodic oscillations in 1A 0535+262
Zihan Yang, Ruican Ma, Mariano Méndez +9
Be/X-ray binary pulsars show transient outbursts and complex timing behaviour, including millihertz quasi-periodic oscillations (QPOs), whose physical origin and energy dependence…
Gaussian process analysis of type-B quasiperiodic oscillations in the black hole X-ray binary MAXI J1348-630
Yiran Wang, Ruican Ma, Haiyun Zhang +1
We analyzed Insight-HXMT data of the black hole X-ray binary MAXI J1348-630 during the type-B QPO phase of its 2019 outburst. Using the Gaussian process method, we applied an addit…
The nature of an imaginary quasi-periodic oscillation in the soft-to-hard transition of MAXI J1820+070
Candela Bellavita, Mariano Méndez, Federico GarcÃa +2
A recent study shows that if the power spectra (PS) of accreting compact objects consist of a combination of Lorentzian functions that are coherent in different energy bands but in…