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  1. No Access

    Article

    Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE

    The accretion of matter by compact objects can be inhibited by radiation pressure if the luminosity exceeds a critical value known as the Eddington limit. The discovery of ultraluminous X-ray sources has shown...

    Alexandra Veledina, Fabio Muleri, Juri Poutanen, Jakub Podgorný… in Nature Astronomy (2024)

  2. No Access

    Article

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

    In an accreting X-ray pulsar, a neutron star accretes matter from a companion star through an accretion disk. The magnetic field of the rotating neutron star disrupts the inner edge of the disk, funnelling the...

    Jeremy Heyl, Victor Doroshenko, Denis González-Caniulef, Ilaria Caiazzo… in Nature Astronomy (2024)

  3. No Access

    Article

    Discovery of X-ray polarization angle rotation in the jet from blazar Mrk 421

    The magnetic-field conditions in astrophysical relativistic jets can be probed by multiwavelength polarimetry, which has been recently extended to X-rays. For example, one can track how the magnetic field chan...

    Laura Di Gesu, Herman L. Marshall, Steven R. Ehlert, Dawoon E. Kim… in Nature Astronomy (2023)

  4. No Access

    Article

    X-ray polarization evidence for a 200-year-old flare of Sgr A*

    The centre of the Milky Way Galaxy hosts a black hole with a solar mass of about 4 million (Sagittarius A* (Sgr A)) that is very quiescent at present with a luminosity many orders of magnitude below those of acti...

    Frédéric Marin, Eugene Churazov, Ildar Khabibullin, Riccardo Ferrazzoli… in Nature (2023)

  5. No Access

    Article

    Simultaneous space and phase resolved X-ray polarimetry of the Crab pulsar and nebula

    The Crab pulsar and its nebula are among the most studied astrophysical systems, and constitute one of the most promising environments where high-energy processes and particle acceleration can be investigated....

    Niccolò Bucciantini, Riccardo Ferrazzoli, Matteo Bachetti, John Rankin… in Nature Astronomy (2023)

  6. No Access

    Article

    Determination of X-ray pulsar geometry with IXPE polarimetry

    Using observations of X-ray pulsar Hercules X-1 by the Imaging X-ray Polarimetry Explorer we report a highly significant (>17σ) detection of the polarization signal from an accreting neutron star. The observed de...

    Victor Doroshenko, Juri Poutanen, Sergey S. Tsygankov… in Nature Astronomy (2022)

  7. No Access

    Article

    Vela pulsar wind nebula X-rays are polarized to near the synchrotron limit

    Pulsar wind nebulae are formed when outflows of relativistic electrons and positrons hit the surrounding supernova remnant or interstellar medium at a shock front. The Vela pulsar wind nebula is powered by a y...

    Fei **e, Alessandro Di Marco, Fabio La Monaca, Kuan Liu, Fabio Muleri… in Nature (2022)

  8. Article

    Open Access

    Polarized blazar X-rays imply particle acceleration in shocks

    Most of the light from blazars, active galactic nuclei with jets of magnetized plasma that point nearly along the line of sight, is produced by high-energy particles, up to around 1 TeV. Although the jets are ...

    Ioannis Liodakis, Alan P. Marscher, Iván Agudo, Andrei V. Berdyugin… in Nature (2022)

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  9. Article

    Open Access

    A polarized view of the hot and violent universe

    X-ray polarimetry has long been considered the ‘holy grail’ of X-ray astronomy. Fortunately, after a silence of more than 40 years, the field is now rejuvenating. In fact, an X-ray polarimeter onboard a Cube-s...

    Paolo Soffitta, Niccolo’ Bucciantini, Eugene Churazov… in Experimental Astronomy (2021)

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  10. No Access

    Article

    Accretion in strong field gravity with eXTP

    In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and superm...

    Alessandra De Rosa, Phil Uttley, LiJun Gou… in Science China Physics, Mechanics & Astrono… (2018)

  11. No Access

    Article

    Physics and astrophysics of strong magnetic field systems with eXTP

    In this paper we present the science potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies of strongly magnetized objects. We will focus on the physics and astrophysics of strongly ...

    Andrea Santangelo, Silvia Zane, Hua Feng… in Science China Physics, Mechanics & Astrono… (2018)

  12. No Access

    Article

    Observatory science with eXTP

    In this White Paper we present the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to Observatory Science targets. These include flaring stars, supernova remnants, acc...

    Jean J. M. in ’t Zand, Enrico Bozzo… in Science China Physics, Mechanics & Astrono… (2018)

  13. No Access

    Article

    XIPE: the X-ray imaging polarimetry explorer

    Abstract X-ray polarimetry, sometimes alone, and sometimes coupled to spectral and temporal variability measurements and to imaging, allows a wealth of physical phenomena in astrophysics ...

    Paolo Soffitta, Xavier Barcons, Ronaldo Bellazzini, João Braga… in Experimental Astronomy (2013)

  14. No Access

    Chapter and Conference Paper

    MHD models of Pulsar Wind Nebulae

    PulsarWind Nebulae (PWNe) are bubbles or relativistic plasma that form when the pulsar wind is confined by the SNR or the ISM. Recent observations have shown a richness of emission features that has driven a r...

    Niccolò Bucciantini in High-Energy Emission from Pulsars and their Systems (2011)