J. Stierhof

Fingerprints of thermal Comptonization in accreting neutron stars. Plasma-vacuum interplay in cyclotron lines and polarisation

E. Sokolova-Lapa, D.K. Maniadakis, J. Stierhof, E. Ambrosi et autres

X-ray emission from accreting, strongly magnetised neutron stars and its pulse-phase variability probe their magnetic-field geometry, spin orientation, and emission processes. Whether the radiation emerges mainly from a hot spot or column, and whether its properties are shaped by bulk or thermal …

de, it, ch, gb, nl, es (code pays fourni par la source)

Double-hump spectrum, pulse profile dip, and pulsed fraction spectra from the low-accretion regime in the X-ray pulsar MAXI J0655-013

C. Malacaria, S.N. Pike, A. D'Aì, G. L. Israel et autres

Context. Accreting X-ray pulsars (XRPs) undergo different physical regimes depending on different mass accretion rates, with related changes in the emitted X-ray spectral properties. Recent observations have shown a dramatic change in the emission properties of this class of sources observed at …

Double-hump spectrum, pulse profile dip, and pulsed fraction spectra from the low-accretion regime in the X-ray pulsar MAXI J0655-013

C. Malacaria, S.N. Pike, A. D'Aì, G. L. Israel et autres

Context. Accreting X-ray pulsars (XRPs) undergo different physical regimes depending on different mass accretion rates, with related changes in the emitted X-ray spectral properties. Recent observations have shown a dramatic change in the emission properties of this class of sources observed at …

it, de, us, fr, es (code pays fourni par la source)

Double-hump spectrum, pulse profile dip, and pulsed fraction spectra from the low-accretion regime in the X-ray pulsar MAXI J0655-013

C. Malacaria, S.N. Pike, A. D'Aì, G. L. Israel et autres

Accreting X-ray pulsars (XRPs) undergo different physical regimes depending on the mass accretion rate. Recent observations have shown a dramatic change in the emission properties of this class of sources observed at low luminosity. We explore the timing and spectral properties of …

Multi-wavelength study of 1eRASS J085039.9−421151 with eROSITA,

A. Zainab, A. Avakyan, V. Doroshenko, P. Thalhammer et autres

The eROSITA instrument on board Spectrum-Roentgen-Gamma (SRG) has completed four scans of the X-ray sky, leading to the detection of almost one million X-ray sources in eRASS1 alone, including multiple new X-ray binary candidates. We report on analysis of the X-ray binary …

de, us, es (code pays fourni par la source)

The giant outburst of EXO 2030+375 I: Spectral and pulse profile evolution

P. Thalhammer, Ralf Ballhausen, E. Sokolova-Lapa, J. Stierhof et autres

The Be X-ray binary EXO 2030+375 went through its third recorded giant outburst from June 2021 to early 2022. We present the results of both spectral and timing analysis based on NICER monitoring, covering the 2-10 keV flux range from 20 to …

Vacuum polarization alters the spectra of accreting X-ray pulsars

E. Sokolova-Lapa, J. Stierhof, T. Dauser, J. Wilms

It is a common belief that for magnetic fields typical for accreting neutron stars in High-Mass X-ray Binaries vacuum polarization only affects the propagation of polarized emission in the neutron star magnetosphere. We show that vacuum resonances can significantly alter the emission …