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Broadband Spectral Properties of MAXI J1348-630 using AstroSat Observations

RESEARCH IN ASTRONOMY AND ASTROPHYSICS (2023)

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Summary: In this study, the black hole candidate MAXI J1348-630 was analyzed using archived data from NuSTAR. The complete outburst evolution of the source from hard state to soft state and back was observed, with an intermediate state found during the transition. The spin parameter and inclination of the accretion disc were determined, as well as the significant truncation of the disc in the hard state.

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Estimation of spin and mass of the black hole in MAXI J1348-630 from the soft state using NICER and NuSTAR observations

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Summary: This study provides a detailed analysis of the transitions of type-B quasi-periodic oscillations (QPOs) in the black hole transient source MAXI J1348-630. The results suggest that type-B QPOs may originate from jet precession and the transitions could indicate instability of the disk-jet structure. Additionally, the study observes transitions from type-B to type-C QPOs, indicating a possible connection between stronger jets or the corona and type-C QPOs.

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A giant X-ray dust scattering ring discovered with SRG/eROSITA around the black hole transient MAXI J1348-630

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Summary: A giant dust scattering ring around the Black Hole transient MAXI J1348-630 was discovered during the first X-ray all-sky survey with SRG/eROSITA. The distance of MAXI J1348-630 was measured to be 3390 pc, making it one of the black hole transients with the most accurately determined distances. This led to a revised mass estimate for the black hole and highlighted the importance of dust scattering halos in making precise distance measurements towards X-ray sources.

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A two-component Comptonization model for the type-B QPO in MAXI J1348-630

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Broad-band spectral and timing properties of MAXI J1348-630 using AstroSat and NICER observations

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NuSTAR monitoring of MAXI J1348-630: evidence of high density disc reflection

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Summary: The study analyzed the broad-band spectral of all six NuSTAR observations of MAXI J1348-630 during its first outburst in 2019, finding that a simple model scheme was inadequate and exploring the possibility of high-density disc reflection using two different sets of models. The REFLIONX-based high-density disc reflection models lowered the iron abundance to around the solar value, with evidence of high-velocity outflow. Consistency in best-fitting parameters for different epochs and statistical significance of the model indicated the presence of high-density disc reflection in MAXI J1348-630.

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NICER uncovers the transient nature of the type-B quasi-periodic oscillation in the black hole candidate MAXI J1348-630

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