NuSTAR and AstroSat observations of GX 9$+$1: Spectral and temporal studies
Neal Titus Thomas, S. B. Gudennavar, S. G. Bubbly

TL;DR
This study uses NuSTAR and AstroSat data to analyze the spectral and temporal properties of the neutron star binary GX 9+1, revealing its soft spectral state, disk parameters, magnetic field estimates, and variability features.
Contribution
It provides the first combined spectral and temporal analysis of GX 9+1 with detailed disk, magnetic, and variability measurements using multiple observatories.
Findings
GX 9+1 was in a soft spectral state during observations.
Estimated the neutron star's magnetic field strength as approximately 2.08×10^8 G.
Detected broad Lorentzian components indicating noise in the temporal data.
Abstract
We have studied the spectro-temporal properties of the neutron star low mass X-ray binary GX 91 using data from \textit{NuSTAR/FPM} and \textit{AstroSat/SXT} and \textit{LAXPC}. The hardness-intensity diagram of the source showed it to be in the soft spectral state during both observations. \textit{NuSTAR} spectral analysis yielded an inclination angle () 29 and inner disk radius () 19.01 km. Assuming that the accretion disk was truncated at the Alfv\'en radius during the observation, the upper limit of the magnetic dipole moment () and the magnetic field strength () at the poles of the neutron star in GX 91 were calculated to be 1.45 G cm and 2.08 G, respectively (for 1). Flux resolved spectral analysis with \textit{AstroSat} data showed the source to be in the soft spectral…
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