A broadband spectral analysis of 4U 1702-429 using XMM-Newton and Beppo SAX data

Simona Michela Mazzola, Tiziana Di Salvo, Rosario Iaria, Angelo Francesco Gambino, Riggio, Sanna, Segreto, Andrea Santangelo, Mazzola, Del Santo, Burderi, D'Amico

Risultato della ricerca: Book/Film/Article review

1 Citazione (Scopus)

Abstract

Context. Most of the X-ray binary systems containing neutron stars classified as Atoll sources show two different spectral states, referred to as soft and hard. Moreover, a large number of these systems show a reflection component relativistically smeared in their spectra, which provides information on the innermost region of the system. Aims. Our aim is to investigate the poorly studied broadband spectrum of the low-mass X-ray binary system 4U 1702-429, which was recently analysed combining XMM-Newton and INTEGRAL data. The peculiar value of the reflection fraction brought us to analyse further broadband spectra of 4U 1702-429. Methods. We re-analysed the spectrum of the XMM-Newton/INTEGRAL observation of 4U 1702-429 in the 0.3-60 keV energy range and we extracted three 0.1-100 keV spectra of the source analysing three observations collected with the BeppoSAX satellite. Results. We find that the XMM-Newton/INTEGRAL spectrum is well fitted using a model composed of a disc blackbody plus a Comptonised component and a smeared reflection component. We used the same spectral model for the BeppoSAX spectra, finding that the addition of a smeared reflection component is statistically significant. The best-fit values of the parameters are compatible to each other for the BeppoSAX spectra. We find that the reflection fraction is 0.05-0.01+0.3 for the XMM-Newton/INTEGRAL spectrum and between 0.15 and 0.4 for the BeppoSAX ones. Conclusions. The relative reflection fraction and the ionisation parameter are incompatible between the XMM-Newton/INTEGRAL and the BeppoSAX observations and the characteristics of the Comptonising corona suggest that the source was in a soft state in the former observation and in a hard state in the latter.
Lingua originaleEnglish
pagine (da-a)A89-
Numero di pagine10
RivistaDefault journal
Volume621
Stato di pubblicazionePublished - 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cita questo

A broadband spectral analysis of 4U 1702-429 using XMM-Newton and Beppo SAX data. / Mazzola, Simona Michela; Di Salvo, Tiziana; Iaria, Rosario; Gambino, Angelo Francesco; Riggio; Sanna; Segreto; Santangelo, Andrea; Mazzola; Del Santo; Burderi; D'Amico.

In: Default journal, Vol. 621, 2019, pag. A89-.

Risultato della ricerca: Book/Film/Article review

Mazzola, SM, Di Salvo, T, Iaria, R, Gambino, AF, Riggio, Sanna, Segreto, Santangelo, A, Mazzola, Del Santo, Burderi & D'Amico 2019, 'A broadband spectral analysis of 4U 1702-429 using XMM-Newton and Beppo SAX data', Default journal, vol. 621, pagg. A89-.
Mazzola, Simona Michela ; Di Salvo, Tiziana ; Iaria, Rosario ; Gambino, Angelo Francesco ; Riggio ; Sanna ; Segreto ; Santangelo, Andrea ; Mazzola ; Del Santo ; Burderi ; D'Amico. / A broadband spectral analysis of 4U 1702-429 using XMM-Newton and Beppo SAX data. In: Default journal. 2019 ; Vol. 621. pagg. A89-.
@article{4d6df2881142489da08c23e27d1ed022,
title = "A broadband spectral analysis of 4U 1702-429 using XMM-Newton and Beppo SAX data",
abstract = "Context. Most of the X-ray binary systems containing neutron stars classified as Atoll sources show two different spectral states, referred to as soft and hard. Moreover, a large number of these systems show a reflection component relativistically smeared in their spectra, which provides information on the innermost region of the system. Aims. Our aim is to investigate the poorly studied broadband spectrum of the low-mass X-ray binary system 4U 1702-429, which was recently analysed combining XMM-Newton and INTEGRAL data. The peculiar value of the reflection fraction brought us to analyse further broadband spectra of 4U 1702-429. Methods. We re-analysed the spectrum of the XMM-Newton/INTEGRAL observation of 4U 1702-429 in the 0.3-60 keV energy range and we extracted three 0.1-100 keV spectra of the source analysing three observations collected with the BeppoSAX satellite. Results. We find that the XMM-Newton/INTEGRAL spectrum is well fitted using a model composed of a disc blackbody plus a Comptonised component and a smeared reflection component. We used the same spectral model for the BeppoSAX spectra, finding that the addition of a smeared reflection component is statistically significant. The best-fit values of the parameters are compatible to each other for the BeppoSAX spectra. We find that the reflection fraction is 0.05-0.01+0.3 for the XMM-Newton/INTEGRAL spectrum and between 0.15 and 0.4 for the BeppoSAX ones. Conclusions. The relative reflection fraction and the ionisation parameter are incompatible between the XMM-Newton/INTEGRAL and the BeppoSAX observations and the characteristics of the Comptonising corona suggest that the source was in a soft state in the former observation and in a hard state in the latter.",
keywords = "Accretion, accretion disks; Stars: Individual: 4U 1702-429; Stars: neutron; X-rays: Binaries; Astronomy and Astrophysics; Space and Planetary Science",
author = "Mazzola, {Simona Michela} and {Di Salvo}, Tiziana and Rosario Iaria and Gambino, {Angelo Francesco} and Riggio and Sanna and Segreto and Andrea Santangelo and Mazzola and {Del Santo} and Burderi and D'Amico",
year = "2019",
language = "English",
volume = "621",
pages = "A89--",
journal = "Default journal",

}

TY - JOUR

T1 - A broadband spectral analysis of 4U 1702-429 using XMM-Newton and Beppo SAX data

AU - Mazzola, Simona Michela

AU - Di Salvo, Tiziana

AU - Iaria, Rosario

AU - Gambino, Angelo Francesco

AU - Riggio, null

AU - Sanna, null

AU - Segreto, null

AU - Santangelo, Andrea

AU - Mazzola, null

AU - Del Santo, null

AU - Burderi, null

AU - D'Amico, null

PY - 2019

Y1 - 2019

N2 - Context. Most of the X-ray binary systems containing neutron stars classified as Atoll sources show two different spectral states, referred to as soft and hard. Moreover, a large number of these systems show a reflection component relativistically smeared in their spectra, which provides information on the innermost region of the system. Aims. Our aim is to investigate the poorly studied broadband spectrum of the low-mass X-ray binary system 4U 1702-429, which was recently analysed combining XMM-Newton and INTEGRAL data. The peculiar value of the reflection fraction brought us to analyse further broadband spectra of 4U 1702-429. Methods. We re-analysed the spectrum of the XMM-Newton/INTEGRAL observation of 4U 1702-429 in the 0.3-60 keV energy range and we extracted three 0.1-100 keV spectra of the source analysing three observations collected with the BeppoSAX satellite. Results. We find that the XMM-Newton/INTEGRAL spectrum is well fitted using a model composed of a disc blackbody plus a Comptonised component and a smeared reflection component. We used the same spectral model for the BeppoSAX spectra, finding that the addition of a smeared reflection component is statistically significant. The best-fit values of the parameters are compatible to each other for the BeppoSAX spectra. We find that the reflection fraction is 0.05-0.01+0.3 for the XMM-Newton/INTEGRAL spectrum and between 0.15 and 0.4 for the BeppoSAX ones. Conclusions. The relative reflection fraction and the ionisation parameter are incompatible between the XMM-Newton/INTEGRAL and the BeppoSAX observations and the characteristics of the Comptonising corona suggest that the source was in a soft state in the former observation and in a hard state in the latter.

AB - Context. Most of the X-ray binary systems containing neutron stars classified as Atoll sources show two different spectral states, referred to as soft and hard. Moreover, a large number of these systems show a reflection component relativistically smeared in their spectra, which provides information on the innermost region of the system. Aims. Our aim is to investigate the poorly studied broadband spectrum of the low-mass X-ray binary system 4U 1702-429, which was recently analysed combining XMM-Newton and INTEGRAL data. The peculiar value of the reflection fraction brought us to analyse further broadband spectra of 4U 1702-429. Methods. We re-analysed the spectrum of the XMM-Newton/INTEGRAL observation of 4U 1702-429 in the 0.3-60 keV energy range and we extracted three 0.1-100 keV spectra of the source analysing three observations collected with the BeppoSAX satellite. Results. We find that the XMM-Newton/INTEGRAL spectrum is well fitted using a model composed of a disc blackbody plus a Comptonised component and a smeared reflection component. We used the same spectral model for the BeppoSAX spectra, finding that the addition of a smeared reflection component is statistically significant. The best-fit values of the parameters are compatible to each other for the BeppoSAX spectra. We find that the reflection fraction is 0.05-0.01+0.3 for the XMM-Newton/INTEGRAL spectrum and between 0.15 and 0.4 for the BeppoSAX ones. Conclusions. The relative reflection fraction and the ionisation parameter are incompatible between the XMM-Newton/INTEGRAL and the BeppoSAX observations and the characteristics of the Comptonising corona suggest that the source was in a soft state in the former observation and in a hard state in the latter.

KW - Accretion

KW - accretion disks; Stars: Individual: 4U 1702-429; Stars: neutron; X-rays: Binaries; Astronomy and Astrophysics; Space and Planetary Science

UR - http://hdl.handle.net/10447/338143

UR - https://www.aanda.org/

M3 - Book/Film/Article review

VL - 621

SP - A89-

JO - Default journal

JF - Default journal

ER -