Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14

Ducci, L.; Mereghetti, S.; Götz, D.; Santangelo, A.

doi:10.1051/0004-6361/201527029

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…Hard X-ray spectral components were subsequently detected with INTEGRAL in other AXPs (1RXS 1708−4009 and 4U 0142+61; Revnivtsev et al 2004;Kuiper et al 2006;den Hartog et al 2008b), as well as in the two brightest SGRs: 1806−20 (Mereghetti et al, 2005a;Molkov et al, 2005;Esposito et al, Götz et al 2006c;Ducci et al 2015. As an example, we show in Fig.…”

Section: The Discovery Of Persistent Hard X-ray Emissionmentioning

confidence: 67%

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The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars

Papitto¹,

Falanga

Hermsen

et al. 2020

New Astronomy Reviews

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In the last 25 years, a new generation of X-ray satellites imparted a significant leap forward in our knowledge of X-ray pulsars. The discovery of accreting and transitional millisecond pulsars proved that disk accretion can spin up a neutron star to a very high rotation speed. The detection of MeV-GeV pulsed emission from a few hundreds of rotation-powered pulsars probed particle acceleration in the outer magnetosphere, or even beyond. Also, a population of two dozens of magnetars has emerged. INTEGRAL played a central role to achieve these results by providing instruments with high temporal resolution up to the hard X-ray/soft γ-ray band and a large field of view imager with good angular resolution to spot hard X-ray transients. In this article, we review the main contributions by INTEGRAL to our understanding of the pulsating hard X-ray sky, such as the discovery and characterization of several accreting and transitional millisecond pulsars, the generation of the first catalog of hard X-ray/soft γ-ray rotation-powered pulsars, the detection of polarization in the hard X-ray emission from the Crab pulsar, and the discovery of persistent hard X-ray emission from several magnetars.

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Section: The Discovery Of Persistent Hard X-ray Emissionmentioning

confidence: 67%

“…Credit: den Hartog et al, A&A, 489, 245 (2008), reproduced with permission (ESO). Götz et al 2006c;Ducci et al 2015. As an example, we show in Fig.…”

Section: The Discovery Of Persistent Hard X-ray Emissionmentioning

confidence: 99%

The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars

Papitto¹,

Falanga

Hermsen

et al. 2020

New Astronomy Reviews

Self Cite

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“…The hard X-ray spectrum of the magnetar SGR 1900+14 has been studied by several groups. The authors of [98] utilized INTEGRAL data from 2003-2013, where SGR 1900+14 was within 12 • from the center of the field of view of IBIS/ISGRI. The spectrum between 22-150 keV was fit by a power-law with photon index Γ = 1.9 ± 0.3 and the flux was F 20−100 = 1.11 ± 0.17 × 10 −11 erg cm −2 s −1 .…”

Section: Sgr 1900+14mentioning

confidence: 99%

Magnetars and axion-like particles: probes with the hard X-ray spectrum

Fortin

Guo

Harris

et al. 2021

J. Cosmol. Astropart. Phys.

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Quiescent hard X-ray and soft gamma-ray emission from neutron stars constitute a promising frontier to explore axion-like-particles (ALPs). ALP production in the core peaks at energies of a few keV to a few hundreds of keV; subsequently, the ALPs escape and convert to photons in the magnetosphere. The emissivity goes as ∼ T 6 while the conversion probability is enhanced for large magnetic fields, making magnetars, with their high core temperatures and strong magnetic fields, ideal targets for probing ALPs. We compute the energy spectrum of photons resulting from conversion of ALPs in the magnetosphere and then compare it against hard X-ray data from NuSTAR, INTEGRAL, and XMM-Newton for a set of eight magnetars for which such data exists. Upper limits are placed on the product of the ALP-nucleon and ALP-photon couplings. For the production in the core, we perform a calculation of the ALP emissivity in degenerate nuclear matter modeled by a relativistic mean field theory. The reduction of the emissivity due to improvements to the one-pion exchange approximation is incorporated, as is the suppression of the emissivity due to proton superfluidity in the neutron star core. A range of core temperatures is considered, corresponding to different models of the steady heat transfer from the core to the stellar surface. For the subsequent conversion, we solve the coupled differential equations mixing ALPs and photons in the magnetosphere. The conversion occurs due to a competition between the dipolar magnetic field and the photon refractive index induced by the external magnetic field. Semi-analytic expressions are provided alongside the full numerical results. We also present an analysis of the uncertainty on the axion limits we derive due to the uncertainties in the magnetar masses, nuclear matter equation of state, and the proton superfluid critical temperature.

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“…The hard X-ray spectrum of the magnetar SGR 1900+14 has been studied by several groups. The authors of [94] utilized INTEGRAL data from 2003-2013, where SGR 1900+14 was within 12 • from the center of the field of view of IBIS/ISGRI. The spectrum between 22-150 keV was fit by a power-law with photon index Γ = 1.9 ± 0.3 and the flux was F 20−100 = 1.11 ± 0.17 × 10 −11 erg cm −2 s −1 .…”

Section: Sgr 1900+14mentioning

confidence: 99%

Magnetars and Axion-like Particles: Probes with the Hard X-ray Spectrum

Fortin,

Guo,

Harris

et al. 2021

Preprint

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Quiescent hard X-ray and soft gamma-ray emission from neutron stars constitute a promising frontier to explore axion-like-particles (ALPs). ALP production in the core peaks at energies of a few keV to a few hundreds of keV; subsequently, the ALPs escape and convert to photons in the magnetosphere. The emissivity goes as ∼ T 6 while the conversion probability is enhanced for large magnetic fields, making magnetars, with their high core temperatures and strong magnetic fields, ideal targets for probing ALPs. We compute the energy spectrum of photons resulting from conversion of ALPs in the magnetosphere and then compare it against hard Xray data from NuSTAR, INTEGRAL, and XMM-Newton for a set of eight magnetars for which such data exists. Upper limits are placed on the product of the ALP-nucleon and ALP-photon couplings. For the production in the core, we perform a careful calculation of the ALP emissivity in degenerate nuclear matter modeled by a relativistic mean field theory. The reduction of the emissivity due to improvements to the one-pion exchange approximation is incorporated, as is the strong suppression of the emissivity due to nucleon superfluidity in the neutron star core. A range of core temperatures is considered, corresponding to different models of the steady heat transfer from the core to the stellar surface. Our treatment also includes the first calculation of the emissivity due to n + p → n + p + a processes in the limit of strongly degenerate nuclear matter. For the subsequent conversion, we solve the coupled differential equations mixing ALPs and photons in the magnetosphere. The conversion occurs due to a competition between the dipolar magnetic field and the photon refractive index induced by the external magnetic field. Semi-analytic expressions are provided alongside the full numerical results.

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Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14

Cited by 4 publications

References 23 publications

The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars

The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars

Magnetars and axion-like particles: probes with the hard X-ray spectrum

Magnetars and Axion-like Particles: Probes with the Hard X-ray Spectrum

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