Broad-band X-ray spectral temporal features of MAXI J1728-36 during its 2019 outburst: Implications on the accretion geometry through reflection spectroscopy
Abstract
We present our study of the Galactic X-ray transient MAXI J1728-36 during its 2019 outburst, using data obtained by Swift, NICER, and NuSTAR. The temporal features, such as Power Density Spectra and time lags are examined using the high time resolution capability of NICER. For our spectral study, we perform a joint fit to the NICER and NuSTAR data to create broadband spectra within the 0.5-78 keV energy range. Spectral modelling using simple disk black-body and power-law models provide the disk temperature and the spectral index of the source. We discover the presence of iron Kα and Ni XXVI lines at 6.4 and 8.2 keV, respectively. Apart from the emission line profiles, the residuals pattern indicate the presence of reflection from the disk. We explore the properties of the reflection profile using a non-relativistic model, such as PEXRAV, and a relativistic model, namely RELXILL. We present our conclusions on the accretion properties of the source based on our spectral and temporal studies, and discuss future prospects with the proposed-to-CSA X-ray mission Colibrì funded by Canadian Space Agency.
- Publication:
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44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.2348C