2023/03/06 by Neal Titus Thomas, Thomas, Neal Titus, S. B. Gudennavar +3
Engineering · Physics and Astronomy · #Astrophysical Phenomena and Observations #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Mechanics and Biomechanics Studies
paper · pdf · doi:10.48550/arxiv.2303.02925
openalex publication_date 2023/03/06 · openalex created_date 2023/03/09 · openalex updated_date 2026/07/28
GX 3+1, an atoll type neutron star low-mass X-ray binary, was observed four times by Soft X-ray Telescope and The Large Area X-ray Proportional Counters on-board AstroSat between October 5, 2017 and August 9, 2018. The hardness-intensity-diagram of the source showed it to be in the soft spectral state during all the four observations. The spectra of the source could be adequately fit with a model consisting of blackbody (\mathttbbody) and power-law (\mathttpowerlaw) components. This yielded the blackbody radius and mass accretion rate to be ∼8 km and ∼2 × 10-9 M\odot y-1, respectively. In one of the observations, a Type I X-ray burst having a rise and e-folding time of 0.6 and 5.6 s, respectively, was detected. Time-resolved spectral analysis of the burst showed that the source underwent a photospheric radius expansion. The radius of the emitting blackbody in GX 3+1 and its distance were estimated to be 9.19 \substack+0.97 -0.82 km and 10.17 \substack+0.07 -0.18 kpc, respectively. Temporal analysis of the burst yielded upper limits of the fractional RMS amplitude of 7%, 5% and 6% during burst start, burst maximum and right after the radius expansion phase, respectively.