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Showing 1–11 of 11 results

Advanced filters: Author: Iván Agudo Clear advanced filters

Complex rotational dynamics of the neutron star in Hercules X-1 revealed by X-ray polarization

IXPE has revealed how the spin of the accreting neutron star Hercules X-1 changes in three dimensions. The spin axis of the star moves both through the star and across the sky, hinting that the crust of the star is asymmetric by almost one part in a million.

Jeremy Heyl
Victor Doroshenko
Silvia Zane
Research18 Jun 2024
Nature Astronomy

Volume: 8, P: 1047-1053
Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE

The accretion geometry of X-ray binary Cygnus X-3 is determined here from IXPE observations. X-ray polarization reveals a narrow funnel with reflecting walls, which focuses emission, making Cyg X-3 appear as an ultraluminous X-ray source.

Alexandra Veledina
Fabio Muleri
Silvia Zane
Research21 Jun 2024
Nature Astronomy

Volume: 8, P: 1031-1046
X-ray polarization evidence for a 200-year-old flare of Sgr A^*

A study reports the measurement of the polarization degree and angle of X-rays from Sagittarius A^* reflected off a nearby cloud, indicating an X-ray flare about 200 years ago.

Frédéric Marin
Eugene Churazov
Silvia Zane
Research21 Jun 2023
Nature

Volume: 619, P: 41-45
Simultaneous space and phase resolved X-ray polarimetry of the Crab pulsar and nebula

X-ray polarization measurements of the Crab nebula and pulsar by the IXPE satellite reveal a global toroidal magnetic field with large variations in local polarization, suggesting a more complex turbulence distribution than anticipated.

Niccolò Bucciantini
Riccardo Ferrazzoli
Silvia Zane
Research06 Apr 2023
Nature Astronomy

Volume: 7, P: 602-610
Determination of X-ray pulsar geometry with IXPE polarimetry

X-ray polarimetry observations with the Imaging X-ray Polarimetry Explorer constrain the accretion geometry in an X-ray pulsar and provide evidence for a misalignment of the spin, magnetic and orbital axes in Her X-1.

Victor Doroshenko
Juri Poutanen
Fei Xie
Research24 Oct 2022
Nature Astronomy

Volume: 6, P: 1433-1443
Vela pulsar wind nebula X-rays are polarized to near the synchrotron limit

Polarization can exceed 60% at the leading edge of the inner part of the Vela pulsar wind nebula; in contrast with the case of the supernova remnant, the electrons in the pulsar wind nebula are accelerated with little or no turbulence in a highly uniform magnetic field.

Fei Xie
Alessandro Di Marco
Silvia Zane
Research21 Dec 2022
Nature

Volume: 612, P: 658-660
Polarized blazar X-rays imply particle acceleration in shocks

Polarization measurements are reported for the blazar Mk501, revealing a degree of X-ray polarization that is more than twice the optical value and supporting the shock-accelerated energy-stratified electron population scenario.

Ioannis Liodakis
Alan P. Marscher
Silvia Zane
ResearchOpen Access23 Nov 2022
Nature

Volume: 611, P: 677-681
Discovery of X-ray polarization angle rotation in the jet from blazar Mrk 421

In June 2022, the IXPE satellite observed a shock passing through the jet of active galaxy Markarian 421. The rotation of the X-ray-polarized radiation over a 5-day period revealed that the jet contains a helical magnetic field.

Laura Di Gesu
Herman L. Marshall
Silvia Zane
Research17 Jul 2023
Nature Astronomy

Volume: 7, P: 1245-1258
The first wave of the COVID-19 epidemic in Spain was associated with early introductions and fast spread of a dominating genetic variant

Analysis of 2,170 SARS-CoV-2 sequences from the first wave of the COVID-19 epidemic in Spain provides insights into transmission patterns and the effects of lockdown on the emergence of new variants.

Mariana G. López
Álvaro Chiner-Oms
Iñaki Comas
Research30 Sept 2021
Nature Genetics

Volume: 53, P: 1405-1414
Impact of SARS-CoV-2 infection therapies on the risk of venous thromboembolism and cardiovascular events from the SEMI-COVID-19 Registry

Crhistian-Mario Oblitas
Pablo Demelo-Rodríguez
Hector Meijide Míguez
ResearchOpen Access05 Mar 2025
Scientific Reports

Volume: 15, P: 1-13
Mortality reduction in older COVID-19-patients hospitalized in Spain during the second pandemic wave from the SEMI-COVID-19 Registry

José-Manuel Casas-Rojo
Juan-Miguel Antón-Santos
Hector Meijide Míguez
ResearchOpen Access18 Oct 2023
Scientific Reports

Volume: 13, P: 1-18