NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar

Angelo Francesco Gambino, Rosario Iaria, Alessio Marino, Tiziana Di Salvo, Enoto, Altamirano, Riggio, Ducci, Guillot, Bozzo, Bult, Sanna, Jaisawal, Ray, Marino, Arzoumanian, Burderi, Markwardt, Strohmayer, GendreauChakrabarty, Wolff, Papitto, Ferrigno, Bogdanov

Risultato della ricerca: Article

6 Citazioni (Scopus)

Abstract

We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4 M and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuSTAR, swift and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of ∼0.7 keV by electrons heated to 21 keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron Kα complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.
Lingua originaleEnglish
pagine (da-a)L8-
Numero di pagine5
RivistaASTRONOMY & ASTROPHYSICS
Volume617
Stato di pubblicazionePublished - 2018

Fingerprint

spectroscopic telescopes
pulsars
neutron stars
seeds
seed
x rays
eclipses
outburst
light curve
inclination
dip
energy spectra
temperature
signatures
broadband
modulation
iron
orbitals
electron
photons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cita questo

NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar. / Gambino, Angelo Francesco; Iaria, Rosario; Marino, Alessio; Di Salvo, Tiziana; Enoto; Altamirano; Riggio; Ducci; Guillot; Bozzo; Bult; Sanna; Jaisawal; Ray; Marino; Arzoumanian; Burderi; Markwardt; Strohmayer; Gendreau; Chakrabarty; Wolff; Papitto; Ferrigno; Bogdanov.

In: ASTRONOMY & ASTROPHYSICS, Vol. 617, 2018, pag. L8-.

Risultato della ricerca: Article

Gambino, AF, Iaria, R, Marino, A, Di Salvo, T, Enoto, Altamirano, Riggio, Ducci, Guillot, Bozzo, Bult, Sanna, Jaisawal, Ray, Marino, Arzoumanian, Burderi, Markwardt, Strohmayer, Gendreau, Chakrabarty, Wolff, Papitto, Ferrigno & Bogdanov 2018, 'NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar', ASTRONOMY & ASTROPHYSICS, vol. 617, pagg. L8-.
Gambino, Angelo Francesco ; Iaria, Rosario ; Marino, Alessio ; Di Salvo, Tiziana ; Enoto ; Altamirano ; Riggio ; Ducci ; Guillot ; Bozzo ; Bult ; Sanna ; Jaisawal ; Ray ; Marino ; Arzoumanian ; Burderi ; Markwardt ; Strohmayer ; Gendreau ; Chakrabarty ; Wolff ; Papitto ; Ferrigno ; Bogdanov. / NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar. In: ASTRONOMY & ASTROPHYSICS. 2018 ; Vol. 617. pagg. L8-.
@article{e19c803197b44e2ba0f90eba07988a26,
title = "NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar",
abstract = "We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4 M and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuSTAR, swift and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of ∼0.7 keV by electrons heated to 21 keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron Kα complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.",
keywords = "Accretion, Accretion disks, Astronomy and Astrophysics, Pulsars: general, Space and Planetary Science, Stars: low-mass, Stars: neutron, X-rays: binaries",
author = "Gambino, {Angelo Francesco} and Rosario Iaria and Alessio Marino and {Di Salvo}, Tiziana and Enoto and Altamirano and Riggio and Ducci and Guillot and Bozzo and Bult and Sanna and Jaisawal and Ray and Marino and Arzoumanian and Burderi and Markwardt and Strohmayer and Gendreau and Chakrabarty and Wolff and Papitto and Ferrigno and Bogdanov",
year = "2018",
language = "English",
volume = "617",
pages = "L8--",
journal = "ASTRONOMY & ASTROPHYSICS",
issn = "0004-6361",

}

TY - JOUR

T1 - NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar

AU - Gambino, Angelo Francesco

AU - Iaria, Rosario

AU - Marino, Alessio

AU - Di Salvo, Tiziana

AU - Enoto, null

AU - Altamirano, null

AU - Riggio, null

AU - Ducci, null

AU - Guillot, null

AU - Bozzo, null

AU - Bult, null

AU - Sanna, null

AU - Jaisawal, null

AU - Ray, null

AU - Marino, null

AU - Arzoumanian, null

AU - Burderi, null

AU - Markwardt, null

AU - Strohmayer, null

AU - Gendreau, null

AU - Chakrabarty, null

AU - Wolff, null

AU - Papitto, null

AU - Ferrigno, null

AU - Bogdanov, null

PY - 2018

Y1 - 2018

N2 - We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4 M and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuSTAR, swift and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of ∼0.7 keV by electrons heated to 21 keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron Kα complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.

AB - We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4 M and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuSTAR, swift and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of ∼0.7 keV by electrons heated to 21 keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron Kα complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.

KW - Accretion

KW - Accretion disks

KW - Astronomy and Astrophysics

KW - Pulsars: general

KW - Space and Planetary Science

KW - Stars: low-mass

KW - Stars: neutron

KW - X-rays: binaries

UR - http://hdl.handle.net/10447/338139

UR - https://www.aanda.org/articles/aa/abs/2018/09/aa34160-18/aa34160-18.html

M3 - Article

VL - 617

SP - L8-

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

ER -