Broadband spectral analysis of MXB 1659-298 in its soft and hard state

Risultato della ricerca: Article

Abstract

Context. The X-ray transient eclipsing source MXB 1659-298 went into outburst in 1999 and 2015. During these two outbursts the source was observed by XMM-Newton, NuSTAR, and Swift/XRT. Aims. Using these observations, we studied the broadband spectrum of the source to constrain the continuum components and to verify whether it had a reflection component, as is observed in other X-ray eclipsing transient sources. Methods. We combined the available spectra to study the soft and hard state of the source in the 0.45-55 keV energy range. Results. We report a reflection component in the soft and hard state. The direct emission in the soft state can be modeled with a thermal component originating from the inner accretion disk plus a Comptonized component associated with an optically thick corona surrounding the neutron star. On the other hand, the direct emission in the hard state is described only by a Comptonized component with a temperature higher than 130 keV; this component is associated with an optically thin corona. We observed narrow absorption lines from highly ionized ions of oxygen, neon, and iron in the soft spectral state. We investigated where the narrow absorption lines form in the ionized absorber. The equivalent hydrogen column density associated with the absorber is close to 6 × 1023 cm-2 and 1.3 × 1023 cm-2 in the soft and hard state, respectively.
Lingua originaleEnglish
pagine (da-a)A138-
Numero di pagine12
RivistaASTRONOMY & ASTROPHYSICS
Volume630
Stato di pubblicazionePublished - 2019

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spectrum analysis
broadband
coronas
absorbers
XMM-Newton telescope
accretion disks
neon
newton
neutron stars
x rays
continuums
iron
oxygen
hydrogen
ions

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cita questo

@article{c6d3deae16974402943bae1c2e1720a8,
title = "Broadband spectral analysis of MXB 1659-298 in its soft and hard state",
abstract = "Context. The X-ray transient eclipsing source MXB 1659-298 went into outburst in 1999 and 2015. During these two outbursts the source was observed by XMM-Newton, NuSTAR, and Swift/XRT. Aims. Using these observations, we studied the broadband spectrum of the source to constrain the continuum components and to verify whether it had a reflection component, as is observed in other X-ray eclipsing transient sources. Methods. We combined the available spectra to study the soft and hard state of the source in the 0.45-55 keV energy range. Results. We report a reflection component in the soft and hard state. The direct emission in the soft state can be modeled with a thermal component originating from the inner accretion disk plus a Comptonized component associated with an optically thick corona surrounding the neutron star. On the other hand, the direct emission in the hard state is described only by a Comptonized component with a temperature higher than 130 keV; this component is associated with an optically thin corona. We observed narrow absorption lines from highly ionized ions of oxygen, neon, and iron in the soft spectral state. We investigated where the narrow absorption lines form in the ionized absorber. The equivalent hydrogen column density associated with the absorber is close to 6 × 1023 cm-2 and 1.3 × 1023 cm-2 in the soft and hard state, respectively.",
author = "Tiziana Bassi and Mazzola, {Simona Michela} and {Di Salvo}, Tiziana and Gambino, {Angelo Francesco} and Alessio Marino and Rosario Iaria and Riggio and Sanna and Marino and Bassi and Burderi and D'Amico",
year = "2019",
language = "English",
volume = "630",
pages = "A138--",
journal = "ASTRONOMY & ASTROPHYSICS",
issn = "0004-6361",

}

TY - JOUR

T1 - Broadband spectral analysis of MXB 1659-298 in its soft and hard state

AU - Bassi, Tiziana

AU - Mazzola, Simona Michela

AU - Di Salvo, Tiziana

AU - Gambino, Angelo Francesco

AU - Marino, Alessio

AU - Iaria, Rosario

AU - Riggio, null

AU - Sanna, null

AU - Marino, null

AU - Bassi, null

AU - Burderi, null

AU - D'Amico, null

PY - 2019

Y1 - 2019

N2 - Context. The X-ray transient eclipsing source MXB 1659-298 went into outburst in 1999 and 2015. During these two outbursts the source was observed by XMM-Newton, NuSTAR, and Swift/XRT. Aims. Using these observations, we studied the broadband spectrum of the source to constrain the continuum components and to verify whether it had a reflection component, as is observed in other X-ray eclipsing transient sources. Methods. We combined the available spectra to study the soft and hard state of the source in the 0.45-55 keV energy range. Results. We report a reflection component in the soft and hard state. The direct emission in the soft state can be modeled with a thermal component originating from the inner accretion disk plus a Comptonized component associated with an optically thick corona surrounding the neutron star. On the other hand, the direct emission in the hard state is described only by a Comptonized component with a temperature higher than 130 keV; this component is associated with an optically thin corona. We observed narrow absorption lines from highly ionized ions of oxygen, neon, and iron in the soft spectral state. We investigated where the narrow absorption lines form in the ionized absorber. The equivalent hydrogen column density associated with the absorber is close to 6 × 1023 cm-2 and 1.3 × 1023 cm-2 in the soft and hard state, respectively.

AB - Context. The X-ray transient eclipsing source MXB 1659-298 went into outburst in 1999 and 2015. During these two outbursts the source was observed by XMM-Newton, NuSTAR, and Swift/XRT. Aims. Using these observations, we studied the broadband spectrum of the source to constrain the continuum components and to verify whether it had a reflection component, as is observed in other X-ray eclipsing transient sources. Methods. We combined the available spectra to study the soft and hard state of the source in the 0.45-55 keV energy range. Results. We report a reflection component in the soft and hard state. The direct emission in the soft state can be modeled with a thermal component originating from the inner accretion disk plus a Comptonized component associated with an optically thick corona surrounding the neutron star. On the other hand, the direct emission in the hard state is described only by a Comptonized component with a temperature higher than 130 keV; this component is associated with an optically thin corona. We observed narrow absorption lines from highly ionized ions of oxygen, neon, and iron in the soft spectral state. We investigated where the narrow absorption lines form in the ionized absorber. The equivalent hydrogen column density associated with the absorber is close to 6 × 1023 cm-2 and 1.3 × 1023 cm-2 in the soft and hard state, respectively.

UR - http://hdl.handle.net/10447/387778

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

M3 - Article

VL - 630

SP - A138-

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

ER -