Explanipedia

X-Ray Polarization Detection of the Pulsar Wind Nebula in G21.5–0.9 with IXPE Open

Niccolò Di Lalla, N. Omodei, N. Bucciantini, Jack T. Dinsmore, Nicoló Cibrario , et al. · 2025

We present the X-ray polarization observation of G21.5−0.9, a young Galactic supernova remnant (SNR), conducted with the Imaging X-ray Polarimetry Explorer (IXPE) in 2023 October, with a total livetime of approximately 837 ks. Using differ…

LHCspin: a Polarized Gas Target for LHC Open

Alberto Accardi, Alessandro Bacchetta, L. Barion, G. Bedeschi, V. Benesova , et al. · 2025

The goal of the LHCspin project is to develop innovative solutions for measuring the 3D structure of nucleons in high-energy polarized fixed-target collisions at LHC, exploring new processes and exploiting new probes in a unique, previousl…

European Strategy for Particle Physics 2026: the NA60+/DiCE experiment at the SPS Open

C. Ahdida, G. Alocco, M. Arba, R. Arnaldi, S. Beolé , et al. · 2025

The exploration of the phase diagram of Quantum ChromoDynamics (QCD) is carried out by studying ultrarelativistic heavy-ion collisions. The energy range covered by the CERN SPS ($\sqrt{s_{\rm {NN}}} \sim 6-17$ GeV) is ideal for the investi…

Evidence for a shock-compressed magnetic field in the northwestern rim of Vela Jr. from X-ray polarimetry Open

Д. А. Прохоров, Yi-Jung Yang, Riccardo Ferrazzoli, Jacco Vink, Patrick Slane , et al. · 2024

Synchrotron X-ray emission has been detected from nearly a dozen young supernova remnants (SNRs). X-rays of synchrotron origin exhibit linear polarization in a regular, non-randomly oriented magnetic field. The significant polarized X-ray …

Evidence for a shock-compressed magnetic field in the northwestern rim of Vela Jr. from X-ray polarimetry Open

Dmitry A. Prokhorov, Yi-Jung Yang, Riccardo Ferrazzoli, Jacco Vink, Patrick Slane , et al. · 2024

Synchrotron X-ray emission has been detected from nearly a dozen young supernova remnants (SNRs). X-rays of synchrotron origin exhibit linear polarization in a regular, non-randomly oriented magnetic field. The significant polarized X-ray …

Analysis of Crab X-Ray Polarization Using Deeper Imaging X-Ray Polarimetry Explorer Observations Open

Josephine Wong, Tsunefumi Mizuno, N. Bucciantini, Roger W. Romani, Yi-Jung Yang , et al. · 2024

We present Crab X-ray polarization measurements using Imaging X-Ray Polarimetry Explorer (IXPE) data with a total exposure of 300 ks, three times more than the initial 2022 discovery paper. Polarization is detected in three times more puls…

Probing the polarized emission from SMC X-1: The brightest X-ray pulsar observed by IXPE Open

Sofia V. Forsblom, Sergey S. Tsygankov, Juri Poutanen, Victor Doroshenko, A. Alexander Mushtukov , et al. · 2024

Recent observations of X-ray pulsars (XRPs) performed by the Imaging X-ray Polarimetry Explorer (IXPE) have made it possible to investigate the intricate details of these objects in a new way, thanks to the added value of X-ray polarimetry…

Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry Open

Juri Poutanen, Sergey S. Tsygankov, Victor Doroshenko, Sofia V. Forsblom, Peter Jenke , et al. · 2024

Discovery of pulsations from a number of ultra-luminous X-ray (ULX) sources proved that accretion onto neutron stars can produce luminosities exceeding the Eddington limit by several orders of magnitude. The conditions necessary to achieve…

The imaging x-ray polarimetry explorer 2.5 years later Open

P. Soffitta, L. Baldini, W. H. Baumgartner, R. Bellazzini, Stephen D. Bongiorno , et al. · 2024

Soffitta, Paolo et al.-- Full list of the authors: Soffitta, Paolo; Baldini, Luca; Baumgartner, Wayne; Bellazzini, Ronaldo; Bongiorno, Stephen D.; Bucciantini, Niccolò; Costa, Enrico; Dovčiak, Michal; Ehlert, Steven; Kaaret, Philip E.; Kol…

Discovery of a strong rotation of the X-ray polarization angle in the galactic burster GX 13+1 Open

Anna Bobrikova, Sofia V. Forsblom, Alessandro Di Marco, Fabio La Monaca, Juri Poutanen , et al. · 2024

Weakly magnetized neutron stars in X-ray binaries show a complex phenomenology with several spectral components that can be associated with the accretion disk, the boundary, and/or a spreading layer, a corona, and a wind. Spectroscopic inf…

Analysis of Crab X-ray Polarization using Deeper IXPE Observations Open

Josephine Wong, Tsunefumi Mizuno, N. Bucciantini, Roger W. Romani, Yi-Jung Yang , et al. · 2024

We present Crab X-ray polarization measurements using IXPE data with a total exposure of 300ks, three times more than the initial 2022 discovery paper. Polarization is detected in three times more pulsar phase bins, revealing an S-shaped $…

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

Jeremy Heyl, Victor Doroshenko, Denis González–Caniulef, Ilaria Caiazzo, Juri Poutanen , et al. · 2024

Probing the polarized emission from SMC X-1: the brightest X-ray pulsar observed by IXPE Open

Sofia V. Forsblom, Sergey S. Tsygankov, Juri Poutanen, Victor Doroshenko, Alexander A. Mushtukov , et al. · 2024

Recent observations of X-ray pulsars (XRPs) performed by the Imaging X-ray Polarimetry Explorer (IXPE) have made it possible to investigate the intricate details of these objects in a new way, thanks to the added value of X-ray polarimetry…

Tracking the X-Ray Polarization of the Black Hole Transient Swift J1727.8–1613 during a State Transition Open

Adam Ingram, Niek Bollemeijer, Alexandra Veledina, Michal Dovčiak, Juri Poutanen , et al. · 2024

We report on an observational campaign on the bright black hole (BH) X-ray binary Swift J1727.8–1613 centered around five observations by the Imaging X-ray Polarimetry Explorer. These observations track for the first time the evolution of …

Discovery of a Shock-compressed Magnetic Field in the Northwestern Rim of the Young Supernova Remnant RX J1713.7–3946 with X-Ray Polarimetry Open

Riccardo Ferrazzoli, Dmitry Prokhorov, N. Bucciantini, Patrick Slane, Jacco Vink , et al. · 2024

Supernova remnants (SNRs) provide insights into cosmic-ray acceleration and magnetic field dynamics at shock fronts. Recent X-ray polarimetric measurements by the Imaging X-ray Polarimetry Explorer (IXPE) have revealed radial magnetic fiel…

X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei: NGC 1068 Open

Frédéric Marin, Andrea Marinucci, M. Laurenti, Dawoon E. Kim, Thibault Barnouin , et al. · 2024

Context. NGC 1068 is the most observed radio-quiet active galactic nucleus (AGN) in polarimetry, yet its high-energy polarization has never been probed before due to a lack of dedicated polarimeters. Aims. Using the first X-ray polarimeter…

Studying geometry of the ultraluminous X-ray pulsar Swift J0243.6+6124 using X-ray and optical polarimetry Open

Juri Poutanen, Sergey S. Tsygankov, Victor Doroshenko, Sofia V. Forsblom, Peter Jenke , et al. · 2024

Discovery of pulsations from a number of ULXs proved that accretion onto neutron stars can produce luminosities exceeding the Eddington limit by several orders of magnitude. The conditions necessary to achieve such high luminosities as wel…

Pulsar-wind-nebula-powered Galactic center X-ray filament G0.13–0.11 Open

E. Churazov, Ildar Khabibullin, Thibault Barnouin, N. Bucciantini, E. Costa , et al. · 2024

We report the discovery of X-ray polarization from the X-ray-bright filament G0.13−0.11 in the Galactic center (GC) region. This filament features a bright, hard X-ray source that is most plausibly a pulsar wind nebula (PWN) and an extende…

X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei : NGC 1068 Open

Frédéric Marin, Andrea Marinucci, M. Laurenti, Dawoon E. Kim, Thibault Barnouin , et al. · 2024

We used the Imaging X-ray Polarimetry Explorer (IXPE) satellite to measure, for the first time, the 2-8 keV polarization of NGC 1068. We pointed IXPE for a net exposure time of 1.15 Ms on the target, in addition to two ~ 10 ks each Chandra…

X-Ray Polarization of the Black Hole X-Ray Binary 4U 1630–47 Challenges the Standard Thin Accretion Disk Scenario Open

Ajay Ratheesh, Michal Dovčiak, H. Krawczynski, Jakub Podgorný, Lorenzo Marra , et al. · 2024

A large energy-dependent X-ray polarization degree is detected by the Imaging X-ray Polarimetry Explorer (IXPE) in the high-soft emission state of the black hole X-ray binary 4U 1630–47. The highly significant detection (at ≈50 σ confidenc…

X-Ray Polarimetry of the Dipping Accreting Neutron Star 4U 1624–49 Open

M. Lynne Saade, P. Kaaret, Andrea Gnarini, Juri Poutanen, F. Ursini , et al. · 2024

We present the first X-ray polarimetric study of the dipping accreting neutron star 4U 1624−49 with the Imaging X-ray Polarimetry Explorer. We report a detection of polarization in the nondip time intervals with a confidence level of 99.99…

INFN ScienzaPerTutti: an overview of the annual contest for schools Open

Susanna Bertelli, L. Bandiera, M. Battaglieri, M. Cinausero, Cecilia Collà Ruolo , et al. · 2024

ScienzaPerTutti, literally ScienceForAll, is the web portal dedicated to Physics education and popularization of science curated by INFN Italian National Institute for Nuclear Physics’ researchers. The contents are mainly addressed to High…

First detection of polarization in X-rays for PSR B0540-69 and its nebula Open

Fei Xie, Josephine Wong, Fabio La Monaca, Roger W. Romani, Jeremy Heyl , et al. · 2024

We report on X-ray polarization measurements of the extra-galactic Crab-like PSR B0540-69 and its Pulsar Wind Nebula (PWN) in the Large Magellanic Cloud (LMC), using a ~850 ks Imaging X-ray Polarimetry Explorer (IXPE) exposure. The PWN is …

Engaging children with science, the INFN Kids project Open

Susanna Bertelli, M. Andreotti, Roberta Antolini, I. Balossino, Serena Barone , et al. · 2024

INFN Kids is a science education project of the Italian National Institute for Nuclear Physics \naddressed to young people of Primary and Middle schools age. The initiative aims at raising \nchildren’s curiosity towards science with a focu…

First Detection of Polarization in X-Rays for PSR B0540-69 and Its Nebula Open

Fei Xie, Josephine Wong, Fabio La Monaca, Roger W. Romani, Jeremy Heyl , et al. · 2024

We report on X-ray polarization measurements of the extragalactic Crab-like PSR B0540-69 and its Pulsar Wind Nebula (PWN) in the Large Magellanic Cloud, using a ∼850 ks Imaging X-ray Polarimetry Explorer (IXPE) exposure. The PWN is unresol…

IXPE observation confirms a high spin in the accreting black hole 4U 1957+115 Open

Lorenzo Marra, M. Brigitte, Nicole Rodriguez Cavero, Sohee Chun, James F. Steiner , et al. · 2024

We present the results of the first X-ray polarimetric observation of the low-mass X-ray binary 4U 1957+115, performed with the Imaging X-ray Polarimetry Explorer in May 2023. The binary system has been in a high-soft spectral state since …

Discovery of a strong rotation of the X-ray polarization angle in the galactic burster GX 13+1 Open

Anna Bobrikova, Sofia V. Forsblom, Alessandro Di Marco, Fabio La Monaca, Juri Poutanen , et al. · 2024

Weakly magnetized neutron stars in X-ray binaries show complex phenomenology with several spectral components that can be associated with the accretion disk, boundary and/or spreading layer, a corona, and a wind. Spectroscopic information …

X-Ray Polarized View of the Accretion Geometry in the X-Ray Binary Circinus X-1 Open

John Rankin, Fabio La Monaca, Alessandro Di Marco, Juri Poutanen, Anna Bobrikova , et al. · 2024

Cir X-1 is a neutron star X-ray binary characterized by strong variations in flux during its eccentric ∼16.6 day orbit. There are also strong variations in the spectral state, and it has historically shown both atoll and Z state properties…

X-Ray Polarization of the Eastern Lobe of SS 433 Open

P. Kaaret, Riccardo Ferrazzoli, Stefano Silvestri, Michela Negro, Alberto Manfreda , et al. · 2024

How astrophysical systems translate the kinetic energy of bulk motion into the acceleration of particles to very high energies is a pressing question. SS 433 is a microquasar that emits TeV γ -rays indicating the presence of high-energy pa…

Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1 Open

Fabio La Monaca, Alessandro Di Marco, Juri Poutanen, Matteo Bachetti, S. Motta , et al. · 2024

The Imaging X-ray Polarimetry Explorer measured with high significance the X-ray polarization of the brightest Z-source, Sco X-1, resulting in the nominal 2–8 keV energy band in a polarization degree of 1.0% ± 0.2% and a polarization angle…

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