SWIFT J1756.9−2508: spectral and timing properties of its 2018 outburst

Rosario Iaria, Simona Michela Mazzola, Angelo Francesco Gambino, Tiziana Di Salvo, Riggio, Bozzo, Pintore, Sanna, Burderi, Papitto, Ferrigno

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3 Citazioni (Scopus)

Abstract

We discuss the spectral and timing properties of the accreting millisecond X-ray pulsar SWIFT J1756.9-2508 observed by XMM-Newton, NICER, and NuSTAR during the X-ray outburst occurred in April 2018. The spectral properties of the source are consistent with a hard state dominated at high energies by a non-thermal power-law component with a cut-off at similar to 70 keV. No evidence of iron emission lines or reflection humps has been found. From the coherent timing analysis of the pulse profiles, we derived an updated set of orbital ephemerides. Combining the parameters measured from the three outbursts shown by the source in the last similar to 11 yr, we investigated the secular evolution of the spin frequency and the orbital period. We estimated a neutron magnetic field of 3.1 x 10(8) < B-PC < 4.5 x 10(8) G and measured an orbital period derivative of -4.1 x 10(-12) < P-orb< 7.1 x 10(-12) s s(-1).We also studied the energy dependence of the pulse profile by characterizing the behaviour of the pulse fractional amplitude in the energy range 0.3-80 keV. These results are compared with those obtained from the previous outbursts of SWIFT J1756.9-2508 and other previously known accreting millisecond X-ray pulsars.
Lingua originaleEnglish
pagine (da-a)1658-1666
Numero di pagine9
RivistaMonthly Notices of the Royal Astronomical Society
Volume481
Stato di pubblicazionePublished - 2018

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outburst
time measurement
orbitals
pulsars
ephemerides
energy
x rays
pulse amplitude
XMM-Newton telescope
profiles
pulses
newton
power law
cut-off
magnetic field
iron
neutrons
magnetic fields
analysis
parameter

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cita questo

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title = "SWIFT J1756.9−2508: spectral and timing properties of its 2018 outburst",
abstract = "We discuss the spectral and timing properties of the accreting millisecond X-ray pulsar SWIFT J1756.9-2508 observed by XMM-Newton, NICER, and NuSTAR during the X-ray outburst occurred in April 2018. The spectral properties of the source are consistent with a hard state dominated at high energies by a non-thermal power-law component with a cut-off at similar to 70 keV. No evidence of iron emission lines or reflection humps has been found. From the coherent timing analysis of the pulse profiles, we derived an updated set of orbital ephemerides. Combining the parameters measured from the three outbursts shown by the source in the last similar to 11 yr, we investigated the secular evolution of the spin frequency and the orbital period. We estimated a neutron magnetic field of 3.1 x 10(8) < B-PC < 4.5 x 10(8) G and measured an orbital period derivative of -4.1 x 10(-12) < P-orb< 7.1 x 10(-12) s s(-1).We also studied the energy dependence of the pulse profile by characterizing the behaviour of the pulse fractional amplitude in the energy range 0.3-80 keV. These results are compared with those obtained from the previous outbursts of SWIFT J1756.9-2508 and other previously known accreting millisecond X-ray pulsars.",
author = "Rosario Iaria and Mazzola, {Simona Michela} and Gambino, {Angelo Francesco} and {Di Salvo}, Tiziana and Riggio and Bozzo and Pintore and Sanna and Burderi and Papitto and Ferrigno",
year = "2018",
language = "English",
volume = "481",
pages = "1658--1666",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",

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TY - JOUR

T1 - SWIFT J1756.9−2508: spectral and timing properties of its 2018 outburst

AU - Iaria, Rosario

AU - Mazzola, Simona Michela

AU - Gambino, Angelo Francesco

AU - Di Salvo, Tiziana

AU - Riggio, null

AU - Bozzo, null

AU - Pintore, null

AU - Sanna, null

AU - Burderi, null

AU - Papitto, null

AU - Ferrigno, null

PY - 2018

Y1 - 2018

N2 - We discuss the spectral and timing properties of the accreting millisecond X-ray pulsar SWIFT J1756.9-2508 observed by XMM-Newton, NICER, and NuSTAR during the X-ray outburst occurred in April 2018. The spectral properties of the source are consistent with a hard state dominated at high energies by a non-thermal power-law component with a cut-off at similar to 70 keV. No evidence of iron emission lines or reflection humps has been found. From the coherent timing analysis of the pulse profiles, we derived an updated set of orbital ephemerides. Combining the parameters measured from the three outbursts shown by the source in the last similar to 11 yr, we investigated the secular evolution of the spin frequency and the orbital period. We estimated a neutron magnetic field of 3.1 x 10(8) < B-PC < 4.5 x 10(8) G and measured an orbital period derivative of -4.1 x 10(-12) < P-orb< 7.1 x 10(-12) s s(-1).We also studied the energy dependence of the pulse profile by characterizing the behaviour of the pulse fractional amplitude in the energy range 0.3-80 keV. These results are compared with those obtained from the previous outbursts of SWIFT J1756.9-2508 and other previously known accreting millisecond X-ray pulsars.

AB - We discuss the spectral and timing properties of the accreting millisecond X-ray pulsar SWIFT J1756.9-2508 observed by XMM-Newton, NICER, and NuSTAR during the X-ray outburst occurred in April 2018. The spectral properties of the source are consistent with a hard state dominated at high energies by a non-thermal power-law component with a cut-off at similar to 70 keV. No evidence of iron emission lines or reflection humps has been found. From the coherent timing analysis of the pulse profiles, we derived an updated set of orbital ephemerides. Combining the parameters measured from the three outbursts shown by the source in the last similar to 11 yr, we investigated the secular evolution of the spin frequency and the orbital period. We estimated a neutron magnetic field of 3.1 x 10(8) < B-PC < 4.5 x 10(8) G and measured an orbital period derivative of -4.1 x 10(-12) < P-orb< 7.1 x 10(-12) s s(-1).We also studied the energy dependence of the pulse profile by characterizing the behaviour of the pulse fractional amplitude in the energy range 0.3-80 keV. These results are compared with those obtained from the previous outbursts of SWIFT J1756.9-2508 and other previously known accreting millisecond X-ray pulsars.

UR - http://hdl.handle.net/10447/338141

M3 - Article

VL - 481

SP - 1658

EP - 1666

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -