Spectral and timing studies of 2S 1417-624 during a giant outburst

Shivangi Gupta, Sachindra Naik, Gaurava Kumar Jaisawal*, Prahlad R. Epili

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We present the results obtained from timing and spectral studies of the accretion powered X-ray pulsar 2S 1417-624 during a giant outburst in 2009 by using Rossi X-ray Timing Explorer (RXTE) observations. X-ray pulsations were detected in the light curves obtained from all epochs of observations. The pulsar was found to be spinning-up during the outburst. The pulse profiles were observed to be strongly dependent on photon energy and luminosity. A double peaked profile at lower luminosity evolved into a triple peaked profile at the peak of the outburst which is further reverted back to a double peaked structure during the decay of the outburst. An anti-correlation was also observed between the pulse fraction and the source flux. The 3-70 keV energy spectrum of pulsar was well described with a power law modified with high energy cutoff model along with an iron fluorescence line at 6.4 keV. Based on the evolution of pulse profile, pulse fraction and spectral parameters across observed luminosity, we interpret our results in terms of changes in the pulsar beam configuration from sub-critical to super-critical regimes.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume479
Issue number4
Pages (from-to)5612-5619
ISSN0035-8711
DOIs
Publication statusPublished - 2018

Keywords

  • Stars: neutron
  • Pulsars: individual: 2S 1417-624
  • X-rays: stars

Cite this

Gupta, Shivangi ; Naik, Sachindra ; Jaisawal, Gaurava Kumar ; Epili, Prahlad R. / Spectral and timing studies of 2S 1417-624 during a giant outburst. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 479, No. 4. pp. 5612-5619.
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abstract = "We present the results obtained from timing and spectral studies of the accretion powered X-ray pulsar 2S 1417-624 during a giant outburst in 2009 by using Rossi X-ray Timing Explorer (RXTE) observations. X-ray pulsations were detected in the light curves obtained from all epochs of observations. The pulsar was found to be spinning-up during the outburst. The pulse profiles were observed to be strongly dependent on photon energy and luminosity. A double peaked profile at lower luminosity evolved into a triple peaked profile at the peak of the outburst which is further reverted back to a double peaked structure during the decay of the outburst. An anti-correlation was also observed between the pulse fraction and the source flux. The 3-70 keV energy spectrum of pulsar was well described with a power law modified with high energy cutoff model along with an iron fluorescence line at 6.4 keV. Based on the evolution of pulse profile, pulse fraction and spectral parameters across observed luminosity, we interpret our results in terms of changes in the pulsar beam configuration from sub-critical to super-critical regimes.",
keywords = "Stars: neutron, Pulsars: individual: 2S 1417-624, X-rays: stars",
author = "Shivangi Gupta and Sachindra Naik and Jaisawal, {Gaurava Kumar} and Epili, {Prahlad R.}",
year = "2018",
doi = "10.1093/mnras/sty1804",
language = "English",
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journal = "Royal Astronomical Society. Monthly Notices",
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Spectral and timing studies of 2S 1417-624 during a giant outburst. / Gupta, Shivangi; Naik, Sachindra; Jaisawal, Gaurava Kumar; Epili, Prahlad R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 479, No. 4, 2018, p. 5612-5619.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Spectral and timing studies of 2S 1417-624 during a giant outburst

AU - Gupta, Shivangi

AU - Naik, Sachindra

AU - Jaisawal, Gaurava Kumar

AU - Epili, Prahlad R.

PY - 2018

Y1 - 2018

N2 - We present the results obtained from timing and spectral studies of the accretion powered X-ray pulsar 2S 1417-624 during a giant outburst in 2009 by using Rossi X-ray Timing Explorer (RXTE) observations. X-ray pulsations were detected in the light curves obtained from all epochs of observations. The pulsar was found to be spinning-up during the outburst. The pulse profiles were observed to be strongly dependent on photon energy and luminosity. A double peaked profile at lower luminosity evolved into a triple peaked profile at the peak of the outburst which is further reverted back to a double peaked structure during the decay of the outburst. An anti-correlation was also observed between the pulse fraction and the source flux. The 3-70 keV energy spectrum of pulsar was well described with a power law modified with high energy cutoff model along with an iron fluorescence line at 6.4 keV. Based on the evolution of pulse profile, pulse fraction and spectral parameters across observed luminosity, we interpret our results in terms of changes in the pulsar beam configuration from sub-critical to super-critical regimes.

AB - We present the results obtained from timing and spectral studies of the accretion powered X-ray pulsar 2S 1417-624 during a giant outburst in 2009 by using Rossi X-ray Timing Explorer (RXTE) observations. X-ray pulsations were detected in the light curves obtained from all epochs of observations. The pulsar was found to be spinning-up during the outburst. The pulse profiles were observed to be strongly dependent on photon energy and luminosity. A double peaked profile at lower luminosity evolved into a triple peaked profile at the peak of the outburst which is further reverted back to a double peaked structure during the decay of the outburst. An anti-correlation was also observed between the pulse fraction and the source flux. The 3-70 keV energy spectrum of pulsar was well described with a power law modified with high energy cutoff model along with an iron fluorescence line at 6.4 keV. Based on the evolution of pulse profile, pulse fraction and spectral parameters across observed luminosity, we interpret our results in terms of changes in the pulsar beam configuration from sub-critical to super-critical regimes.

KW - Stars: neutron

KW - Pulsars: individual: 2S 1417-624

KW - X-rays: stars

U2 - 10.1093/mnras/sty1804

DO - 10.1093/mnras/sty1804

M3 - Journal article

VL - 479

SP - 5612

EP - 5619

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 4

ER -