Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 2207.05573

Simultaneous space and phase resolved X-ray polarimetry of the Crab Pulsar and Nebula

Niccolò Bucciantini·Riccardo Ferrazzoli·Matteo Bachetti·John Rankin·Niccolò Di Lalla·Carmelo Sgrò·Nicola Omodei·Takao Kitaguchi·Tsunefumi Mizuno·Shuichi Gunji·Eri Watanabe·Luca Baldini·Patrick Slane·Martin C. Weisskopf·Roger W. Romani·Andrea Possenti·Herman L. Marshall·Stefano Silvestri·Luigi Pacciani·Michela Negro·Fabio Muleri·Emma de Oña Wilhelmi·Fei Xie·Jeremy Heyl·Melissa Pesce-Rollins·Josephine Wong·Maura Pilia·Ivan Agudo·Lucio A. Antonelli·Wayne H. Baumgartner·Ronaldo Bellazzini·Stefano Bianchi·Stephen D. Bongiorno·Raffaella Bonino·Alessandro Brez·Fiamma Capitanio·Simone Castellano·Elisabetta Cavazzuti·Stefano Ciprini·Enrico Costa·Alessandra De Rosa·Ettore Del Monte·Laura Di Gesu·Alessandro Di Marco·Immacolata Donnarumma·Victor Doroshenko·Michal Dovčiak·Steven R. Ehlert·Teruaki Enoto·Yuri Evangelista·Sergio Fabiani·Javier A. Garcia·Kiyoshi Hayashida·Wataru Iwakiri·Svetlana G. Jorstad·Vladimir Karas·Jeffery J. Kolodziejczak·Henric Krawczynski·Fabio La Monaca·Luca Latronico·Ioannis Liodakis·Simone Maldera·Alberto Manfreda·Frédéric Marin·Andrea Marinucci·Alan P. Marscher·Francesco Massaro·Giorgio Matt·Ikuyuki Mitsuishi·C. -Y. Ng·Stephen L. O'Dell·Chiara Oppedisano·Alessandro Papitto·George G. Pavlov·Abel L. Peirson·Matteo Perri·Pierre-Olivier Petrucci·Juri Poutanen·Simonetta Puccetti·Brian D. Ramsey·Ajay Ratheesh·Paolo Soffitta·Gloria Spandre·Toru Tamagawa·Fabrizio Tavecchio·Roberto Taverna·Yuzuru Tawara·Allyn F. Tennant·Nicolas E. Thomas·Francesco Tombesi·Alessio Trois·Sergey Tsygankov·Roberto Turolla·Jacco Vink·Kinwah Wu·Silvia Zane
View original source ↗Read source document ↗Export metadata ↓

Abstract

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. They are the only objects for which previous X-ray polarisation has been reported. We present here the first Imaging X-ray Polarimetry Explorer (IXPE) observation of the Crab pulsar and nebula. The total pulsar pulsed emission in the [2-8] keV energy range is unpolarised. Significant polarisation up to 15% is detected only in the core of the main peak. The nebula has a total space integrated polarised degree of 20% and polarisation angle of 145deg. The polarised maps show a large variation in the local polarisation, and regions with polarised degree up to 45-50%. The polarisation pattern suggests a predominantly toroidal magnetic field.

Explore related subjects

astro-ph.HEastro-ph.IM

Keep this discovery

BibTeXRIS

Niccolò Bucciantini, Riccardo Ferrazzoli, Matteo Bachetti, John Rankin, Niccolò Di Lalla, Carmelo Sgrò, Nicola Omodei, Takao Kitaguchi, Tsunefumi Mizuno, Shuichi Gunji, Eri Watanabe, Luca Baldini, Patrick Slane, Martin C. Weisskopf, Roger W. Romani, Andrea Possenti, Herman L. Marshall, Stefano Silvestri, Luigi Pacciani, Michela Negro, Fabio Muleri, Emma de Oña Wilhelmi, Fei Xie, Jeremy Heyl, Melissa Pesce-Rollins, Josephine Wong, Maura Pilia, Ivan Agudo, Lucio A. Antonelli, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Alessandro Di Marco, Immacolata Donnarumma, Victor Doroshenko, Michal Dovčiak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Javier A. Garcia, Kiyoshi Hayashida, Wataru Iwakiri, Svetlana G. Jorstad, Vladimir Karas, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frédéric Marin, Andrea Marinucci, Alan P. Marscher, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, C. -Y. Ng, Stephen L. O'Dell, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Pierre-Olivier Petrucci, Juri Poutanen, Simonetta Puccetti, Brian D. Ramsey, Ajay Ratheesh, Paolo Soffitta, Gloria Spandre, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicolas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Kinwah Wu, Silvia Zane. 2022-07-12. Simultaneous space and phase resolved X-ray polarimetry of the Crab Pulsar and Nebula. https://arxiv.org/abs/2207.05573

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

IceCube neutrino point-source searches in the direction of the KM3NeT ultra-high-energy event

While still under construction, the KM3NeT Astroparticle Research with Cosmics in the Abyss (ARCA) detector recorded a $\sim$200 PeV neutrino on February 13th, 2023. This event is the highest-energy neutrino reported. IceCube, a cubic kilometer neutrino detector located at the geographic South Pole, has previously detected neutrinos up to approximately 10 PeV. We search for high-energy neutrinos from the location of the KM3NeT event using 15 years of IceCube data and considering three temporal hypotheses: steady or flaring in time coincidence, or at an arbitrary time. We find no evidence for neutrino emission for any of the studies performed. Correspondingly, we set upper limits on the neutrino flux from a point source in the direction of KM3-230213A. We compare these limits to KM3NeT's estimated flux and show that an astrophysical explanation of this event is strongly constrained for a variety of spectral assumptions for a steady or transient point source with the flux inferred from the single KM3NeT ultra-high-energy event assuming a spectral index of 2.0.

astro-ph.HE↗
arXiv2026

Evidence for the binary nature of the long-period radio transient ASKAP/DART J1832-0911

Long-period transients are a class of periodic pulsed radio source repeating on the minute to hour timescale. Recently, an increasing number of them are being identified as binary systems, specifically white dwarfs with low-mass main-sequence companions. In this work we analyse the most luminous long-period transient discovered to date, ASKAP/DART J1832-0911, with two years of radio data, and propose that it, too, may be a white dwarf system, although in a far more compact orbit than the aforementioned. The pulses are composed of quasi-periodic components which evolve in a systematic way over days and months. The source is highly linearly or elliptically polarised and its brightness enabled very high signal-to-noise measurement of the time-resolved Faraday rotation measure, which was found to vary across pulse phase. The linear polarisation position angle, circular polarised fraction, and spectral index also varied systematically in ways not typical of pulsars and magnetars. We show that an ultra-compact asynchronous polar explains much of the phenomenology of ASKAP/DART J1832-0911, in particular the evolution of the pulse morphology, rotation measure variation, and periodic X-ray emission, although we cannot conclusively prove a binary nature. However, our model makes testable predictions.

astro-ph.HE↗
arXiv2026

Nonbirefringent model of orthogonal polarization modes in radio pulsars - New view on S swing and mode structure in pulsar beam

Two orthogonal polarization modes observed in radio pulsar signals have long been attributed to proper modes of wave oscillation in strongly magnetized plasma. Yet it has been shown recently that they show up readily for extended emission regions that produce incoherently-superposed polarization signal. In this paper we present a two-dimensional polarization model based on incoherent superposition of radio signals. The model involves a single proper mode, say the O mode, but leads to the appearance of two orthogonal polarization tracks and naturally produces the triple form of polarization mode segregation in averaged profiles (central mode flanked on boths sides by another mode), as well as the displacement of modes in latitude, previously inferred from beam mapping. In the case of conal emission regions, the modelled polarization tends to mimic general polarization properties of the rotating vector model (RVM). However, the reason for this is the symmetry of the emission region - not the usual projection of dipolar magnetic azimuths. Thus the emerging RVM parameters reveal geometry of the emission region, not of the dipolar magnetic field. The results strongly support the vital role of nonbirefringent modal effects in radio pulsar profiles. Two proper modes may not be needed to explain observations of two orthogonal polarization tracks.

astro-ph.HE↗