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Title: AstroSat observation of the magnetar SGR J1830−0645 during its first detected X-ray outburst
Authors: Sharma, Rahul
Jain, Chetana
Paul, Biswajit
Seshadri, T. R.
Keywords: stars
SGR J1830−0645
Issue Date: 1-Oct-2023
Publisher: Oxford University Press on behalf of Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2023, Vol. 526, p4877
Abstract: We present here timing and spectral analyses of SGR J1830−0645 based on an AstroSat observation carried out on 2020 October 16, about a week after the onset of its first detected X-ray outburst. Using data taken with the Soft X-ray Telescope (SXT) and Large Area X-ray Proportional Counter (LAXPC), we have detected 0.9–10 keV coherent pulsations at a period of ∼10.4 s. The pulse profiles were single-peaked, asymmetric, and consisted of minor peaks attributable to hotspots on the neutron star surface. The pulsed fraction evolved significantly with energy, increasing to energies around 5 keV with a steep drop thereafter. The 0.9–25 keV SXT–LAXPC energy spectrum is best described with two thermal components having temperatures ∼0.46 and ∼1.1 keV (emission radii of ∼2.4 and ∼0.65 km, respectively, assuming a distance of 4 kpc) along with a power-law component having a photon index of ∼0.39. We report the detection of 67 X-ray bursts having an average duration of ∼33 ms. The brightest burst lasted for about 90 ms and had a 3–25 keV fluence of ∼5 × 10−9 erg cm−2 .
Description: Open Access
ISSN: 0035-8711
1365-2966 (Online)
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Copyright: 2023 The Author(s)
Appears in Collections:Research Papers (A&A)

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