The AstroSat observation of accreting millisecond X-ray pulsar SAX J1808.4-3658 during its 2019 outburst
The AstroSat observation of accreting millisecond X-ray pulsar SAX J1808.4-3658 during its 2019 outburst
We report on the analysis of the AstroSat dataset of the accreting millisecond X-ray pulsar SAX J1808.4-3658, obtained during its 2019 outburst. We found coherent pulsations at $\sim 401$ Hz and an orbital solution consistent with previous studies. The 3-20 keV pulse profile can be well fitted with three harmonically related sinusoidal components with background-corrected fractional amplitude of $\sim 3.5 \%$, $\sim 1.2 \%$ and $\sim 0.37 \%$ for fundamental, second and third harmonic, respectively. Our energy-resolved pulse profile evolution study indicate a strong energy dependence. We also observed a soft lag in fundamental and hard lag during its harmonic. The broadband spectrum of SAX J1808.4-3658 can be well described with a combination of thermal emission component with $kT \sim 1$ keV, a thermal Comptonization ($\Gamma \sim 1.67$) from the hot corona and broad emission lines due to Fe.
astro-ph.HE
3811–3818
Sharma, Rahul
76683c23-736b-450c-9c4e-2d18726c4b63
Sanna, Andrea
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Beri, Aru
69ed346a-f02a-4243-83f9-ad5ab4c4008c
Sharma, Rahul
76683c23-736b-450c-9c4e-2d18726c4b63
Sanna, Andrea
2c05dccc-d674-4ca7-b324-730eb73d6a36
Beri, Aru
69ed346a-f02a-4243-83f9-ad5ab4c4008c
Sharma, Rahul, Sanna, Andrea and Beri, Aru
(2022)
The AstroSat observation of accreting millisecond X-ray pulsar SAX J1808.4-3658 during its 2019 outburst.
Monthly Notices of the Royal Astronomical Society: Letters, 519 (3), .
(doi:10.1093/mnras/stac3779).
Abstract
We report on the analysis of the AstroSat dataset of the accreting millisecond X-ray pulsar SAX J1808.4-3658, obtained during its 2019 outburst. We found coherent pulsations at $\sim 401$ Hz and an orbital solution consistent with previous studies. The 3-20 keV pulse profile can be well fitted with three harmonically related sinusoidal components with background-corrected fractional amplitude of $\sim 3.5 \%$, $\sim 1.2 \%$ and $\sim 0.37 \%$ for fundamental, second and third harmonic, respectively. Our energy-resolved pulse profile evolution study indicate a strong energy dependence. We also observed a soft lag in fundamental and hard lag during its harmonic. The broadband spectrum of SAX J1808.4-3658 can be well described with a combination of thermal emission component with $kT \sim 1$ keV, a thermal Comptonization ($\Gamma \sim 1.67$) from the hot corona and broad emission lines due to Fe.
Text
2212.10088v1
- Author's Original
Text
The Astro Sat observation of accreting millisecond X-Ray pulsar SAX J1808.44.3658 during its 2019 outburst
- Accepted Manuscript
Text
stac3779
- Version of Record
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Accepted/In Press date: 19 December 2022
e-pub ahead of print date: 23 December 2022
Additional Information:
arXiv:2212.10088V1
Keywords:
astro-ph.HE
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Local EPrints ID: 474214
URI: http://eprints.soton.ac.uk/id/eprint/474214
ISSN: 1745-3925
PURE UUID: 43466ab9-8acf-49c3-9588-7eb24e5a1ac7
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Date deposited: 16 Feb 2023 17:36
Last modified: 17 Mar 2024 00:53
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Author:
Rahul Sharma
Author:
Andrea Sanna
Author:
Aru Beri
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