Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704

Tiziana Di Salvo; Rosario Iaria; null Altamirano; null Riggio; null Degenaar; Thomas Maccarone; null Bozzo; null Bahramian; null Sanna; null Wijnands; null Sivakoff; null Heinke; null Burderi; null Possenti; null Papitto; null D'Amico; null Ferrigno; null Burgay

Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704

Tiziana Di Salvo, Rosario Iaria, Altamirano, Riggio, Degenaar, Thomas Maccarone, Bozzo, Bahramian, Sanna, Wijnands, Sivakoff, Heinke, Burderi, Possenti, Papitto, D'Amico, Ferrigno, Burgay

Fisica e Chimica - Emilio Segrè

Risultato della ricerca: Article › peer review

23 Citazioni (Scopus)

Abstract

We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597-3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in the globular cluster NGC 6256 at a distance of 9.1 kpc. The X-ray pulsations show a clear Doppler modulation that implies an orbital period of â¼46 min and a projected semi-major axis of â¼5 lt-ms, which makes IGR J16597-3704 an ultracompact X-ray binary system. We estimated a minimum companion mass of 6.5 Ã 10-10Mâ, assuming a neutron star mass of 1.4 Mâ, and an inclination angle of <75Â° (suggested by the absence of eclipses or dips in its light curve). The broad-band energy spectrum of the source is well described by a disk blackbody component (kT â¼ 1.4 keV) plus a comptonised power-law with photon index â¼2.3 and an electron temperature of â¼30 keV. Radio pulsations from the source were unsuccessfully searched for with the Parkes Observatory.

Lingua originale	English
Numero di pagine	5
Rivista	ASTRONOMY & ASTROPHYSICS
Volume	610
Stato di pubblicazione	Published - 2018

All Science Journal Classification (ASJC) codes

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title = "Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704",

abstract = "We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597-3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in the globular cluster NGC 6256 at a distance of 9.1 kpc. The X-ray pulsations show a clear Doppler modulation that implies an orbital period of {\^a}¼46 min and a projected semi-major axis of {\^a}¼5 lt-ms, which makes IGR J16597-3704 an ultracompact X-ray binary system. We estimated a minimum companion mass of 6.5 {\~A} 10-10M{\^a}, assuming a neutron star mass of 1.4 M{\^a}, and an inclination angle of <75{\^A}° (suggested by the absence of eclipses or dips in its light curve). The broad-band energy spectrum of the source is well described by a disk blackbody component (kT {\^a}¼ 1.4 keV) plus a comptonised power-law with photon index {\^a}¼2.3 and an electron temperature of {\^a}¼30 keV. Radio pulsations from the source were unsuccessfully searched for with the Parkes Observatory.",

author = "{Di Salvo}, Tiziana and Rosario Iaria and Altamirano and Riggio and Degenaar and Thomas Maccarone and Bozzo and Bahramian and Sanna and Wijnands and Sivakoff and Heinke and Burderi and Possenti and Papitto and D'Amico and Ferrigno and Burgay",

year = "2018",

language = "English",

volume = "610",

journal = "ASTRONOMY & ASTROPHYSICS",

issn = "0004-6361",

}

TY - JOUR

T1 - Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704

AU - Di Salvo, Tiziana

AU - Iaria, Rosario

AU - Altamirano, null

AU - Riggio, null

AU - Degenaar, null

AU - Maccarone, Thomas

AU - Bozzo, null

AU - Bahramian, null

AU - Sanna, null

AU - Wijnands, null

AU - Sivakoff, null

AU - Heinke, null

AU - Burderi, null

AU - Possenti, null

AU - Papitto, null

AU - D'Amico, null

AU - Ferrigno, null

AU - Burgay, null

PY - 2018

Y1 - 2018

N2 - We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597-3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in the globular cluster NGC 6256 at a distance of 9.1 kpc. The X-ray pulsations show a clear Doppler modulation that implies an orbital period of â¼46 min and a projected semi-major axis of â¼5 lt-ms, which makes IGR J16597-3704 an ultracompact X-ray binary system. We estimated a minimum companion mass of 6.5 Ã 10-10Mâ, assuming a neutron star mass of 1.4 Mâ, and an inclination angle of <75Â° (suggested by the absence of eclipses or dips in its light curve). The broad-band energy spectrum of the source is well described by a disk blackbody component (kT â¼ 1.4 keV) plus a comptonised power-law with photon index â¼2.3 and an electron temperature of â¼30 keV. Radio pulsations from the source were unsuccessfully searched for with the Parkes Observatory.

AB - We report the discovery of X-ray pulsations at 105.2 Hz (9.5 ms) from the transient X-ray binary IGR J16597-3704 using NuSTAR and Swift. The source was discovered by INTEGRAL in the globular cluster NGC 6256 at a distance of 9.1 kpc. The X-ray pulsations show a clear Doppler modulation that implies an orbital period of â¼46 min and a projected semi-major axis of â¼5 lt-ms, which makes IGR J16597-3704 an ultracompact X-ray binary system. We estimated a minimum companion mass of 6.5 Ã 10-10Mâ, assuming a neutron star mass of 1.4 Mâ, and an inclination angle of <75Â° (suggested by the absence of eclipses or dips in its light curve). The broad-band energy spectrum of the source is well described by a disk blackbody component (kT â¼ 1.4 keV) plus a comptonised power-law with photon index â¼2.3 and an electron temperature of â¼30 keV. Radio pulsations from the source were unsuccessfully searched for with the Parkes Observatory.

UR - http://hdl.handle.net/10447/282149

M3 - Article

SN - 0004-6361

VL - 610

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

ER -

Discovery of 105 Hz coherent pulsations in the ultracompact binary IGR J16597-3704

Abstract

All Science Journal Classification (ASJC) codes

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