Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Jacco Vink"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 505(1), 1413-1421. Oxford University Press
We present a systematic search for gamma-ray emission from supernovae (SNe) in the Fermi Large Area Telescope (LAT) Pass 8 data. The sample of targets consists of 55,880 candidates from the Open Supernova Catalog. We searched for gamma rays from SNe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd95e4bc3387324d7e01ed800e9ce648
https://dare.uva.nl/personal/pure/en/publications/search-for-gamma-rays-from-sne-with-a-variablesize-slidingtimewindow-analysis-of-the-fermilat-data(0c5a672f-8b78-4a48-a1b1-6431ca627b2b).html
https://dare.uva.nl/personal/pure/en/publications/search-for-gamma-rays-from-sne-with-a-variablesize-slidingtimewindow-analysis-of-the-fermilat-data(0c5a672f-8b78-4a48-a1b1-6431ca627b2b).html
Autor:
Michael Punch, Christo Venter, Christian Stegmann, Stefan Wagner, Andreas Zech, Yasunobu Uchiyama, M. Hörbe, L. Mohrmann, Hassan Abdalla, Albert Seyffert, Michael Backes, Laenita Lorraine Oberholzer, Dieter Horns, K. Nakashima, Tim Holch, K. Bernloehr, Naomi Tsuji, Heinrich J. Völk, Regis Terrier, Carlo Romoli, Gerard Fontaine, Tadayuki Takahashi, M. Fuessling, Hester Schutte, S. Steinmassl, Samuel Timothy Spencer, Sami Caroff, Victor Doroshenko, Frank M. Rieger, Clemens Hoischen, A. A. Zdziarski, P. T. O'Brien, Markus Holler, Q. Remy, Felix Jankowsky, Hannah Dalgleish, German Hermann, Paul Morris, Anne Lemiere, E. Kasai, Louis Du Plessis, Johann van der Walt, Martin Tluczykont, Dan Parsons, Anna Barnacka, D. Malyshev, Nukri Komin, Tom Armstrong, Felix Aharonian, Gilles Maurin, J. F. Glicenstein, David Sanchez, Krzysztof Katarzynski, Victor Barbosa Martins, Ira Jung, C. Arcaro, Sebastian Panny, Gianluca Giavitto, Angel Noel, Bruno Khelifi, Alison Mitchell, Santiago Pita, Werner Hofmann, Gašper Kukec Mezek, Atreyee Sinha, Emma Ona-Wilhelmi, Jonathan Mackey, Carlo van Rensburg, Gerd Puehlhofer, Lei Sun, Laura Olivera-Nieto, Hambeleleni Ndiyavala, Floriane Cangemi, A. Yusafzai, C. Levy, Alexandre Marcowith, Felix Werner, Thomas Lohse, Hend Yassin, Anton Dmytriiev, Manuel Meyer, Arnaud Mares, Manami Sasaki, Mathieu Naurois, Catherine Boisson, Jhilik Majumdar, N. Zywucka, Sumari Hattingh, Takaaki Tanaka, Gavin Rowell, Hector Rueda Ricarte, Mathieu Bony, Oguzhan Anguener, C. Moore, Riaan Steenkamp, Richard White, Kirsty Feijen, Heike Prokoph, Thomas Bylund, Rowan Batzofin, Andreas Zmija, Dorit Glawion, Samuel Zouari, Tomasz Bulik, Robert Brose, Andrea Santangelo, Jacco Vink, Michal Ostrowski, Anna Luashvili, Jacques Muller, Malgorzata Curlo, Marion Spir-Jacob, M. Lemoine-Goumard, Lente Dreyer, David Huber, J.-P. Lenain, Matthieu Renaud, Amid Nayerhoda, Hugh Spackman, Michael Kreter, Justine Devin, Sabrina Casanova, Anu Kundu, Stefan Klepser, V. Sahakian, G. Peron, Alessandro Montanari, Garret Cotter, Vikas Joshi, Zhiqiu Huang, T. Chand, Lott Frans, D. A. Prokhorov, K. Kosack, Sylvia Zhu, P. J. Meintjes, David Berge, Yves Gallant, Lukasz Stawarz, Stefan Ohm, Halim Ashkar, Fabian Leuschner, Jason John Watson, Davit Zargaryan, Arache Djannati-Ataï, Johannes Schaefer, S. J. Fegan, Andreas Quirrenbach, Gaëtan Fichet de Clairfontaine, Axel Donath, A. W. Chen, Stefan Funk, Alicja Wierzcholska, Guillem Marti'i-Devesa, P. Reichherzer, V. Poireau, Jimmy N.S. Shapopi, Jaqueline Catalano, Stefano Gabici, Ramin Marx, M. Panter, Michael Zacharias, Jim Hinton, Jean-Pierre Ernenwein, U. Katz, G. Lamanna, R. Konno, Isak Delberth Davids, Fabian Schüssler, A. Fiasson, Sabrina Einecke, Iryna Lypova, S. Sailer, Dmitry Khangulyan, Charles Thorpe-Morgan, Roberta Zanin, Emmanuel Moulin, Andrew Taylor, B. Rudak, Kathrin Egberts, Johannes Veh, J. Bolmont, Faical Ait-Benkhali, Kleopas Shiningayamwe, Jacek Niemiec, G. Vasileiadis, Monica Barnard, Yvonne Becherini, Denys Malyshev, Maria Haupt, Olaf Reimer, Edna Ruiz Velasco, Lenka Tomankova, Sébastien Le Stum, Thomas Murach, Christopher van Eldik, Rafal Moderski, Mohanraj Senniappan, Francois Brun, P. Vincent, Heiko Salzmann, Andreas Specovius, Yu Wun Wong, Vincent Marandon, Hannes Thiersen, Vardan Baghmanyan, Celine Armand, Dmitriy Kostunin, L. Giunti, Brian van Soelen, Thomas Tavernier, Markus Boettcher, Michelle Tsirou, M.-H. Grondin, Rachel Simoni, Anita Reimer, Constantin Steppa, Ullrich Schwanke, Jean Damascene Mbarubucyeye, Wlodek Kluzniak, Brian Reville, Connor Duffy, James Davies, R. J. Tuffs, B. Bi, Mischa Breuhaus, Pauline Chambery, Marek Jamrozy, Helene Sol, Paolo Marchegiani
Publikováno v:
PoS: Proceedings of Science, 395
Proceedings of 37th International Cosmic Ray Conference
INSPIRE-HEP
Proceedings of Science
HAL
PoS
37th International Cosmic Ray Conference
37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.780
Scopus-Elsevier
Proceedings of 37th International Cosmic Ray Conference
INSPIRE-HEP
Proceedings of Science
HAL
PoS
37th International Cosmic Ray Conference
37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.780
Scopus-Elsevier
Highly extended gamma-ray emission around the Geminga pulsar was discovered by Milagro and verified by HAWC. Despite many observations with Imaging Atmospheric Cherenkov Telescopes (IACTs), detection of gamma-ray emission on angular scales exceeding
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cead37d18bfb3b3b5b58a0dfabd6443d
https://hdl.handle.net/20.500.11850/589612
https://hdl.handle.net/20.500.11850/589612
Autor:
Emanuele Greco, Marco Miceli, Salvatore Orlando, Barbara Olmi, Fabrizio Bocchino, Shigehiro Nagataki, Lei Sun, Jacco Vink, Vincenzo Sapienza, Masaomi Ono, Akira Dohi, Giovanni Peres
Publikováno v:
The Astrophysical Journal
ZENODO
NARCIS
arXiv.org e-Print Archive
ORCID
Datacite
Astrophysical Journal, 931:132. IOP Publishing Ltd.
ZENODO
NARCIS
arXiv.org e-Print Archive
ORCID
Datacite
Astrophysical Journal, 931:132. IOP Publishing Ltd.
Since the day of its explosion, supernova (SN) 1987A has been closely monitored to study its evolution and to detect its central compact relic. In fact, the formation of a neutron star is strongly supported by the detection of neutrinos from the SN.
Autor:
Jacco Vink
Publikováno v:
Astronomy and Astrophysics Library ISBN: 9783030552299
The connection between supernovae and neutron stars goes back to the seminal publications by W. Baade and F. Zwicky in 1934, in which they coined both the term “super-nova”, suggested a connection between cosmic rays and “super-novae” and pos
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83336e82dd313164516ae1721aac485e
https://doi.org/10.1007/978-3-030-55231-2_6
https://doi.org/10.1007/978-3-030-55231-2_6
Autor:
Natalia Żywucka, M. de Naurois, T. Chand, Frank M. Rieger, J. Bolmont, S. Colafrancesco, Ruizhi Yang, W. Kluźniak, S. Eschbach, Jim Hinton, R. Simoni, Dmitry Khangulyan, Christopher J. Moore, G. Fontaine, M. Büchele, D. A. Sanchez, T. Tavernier, L. Mohrmann, Denys Malyshev, J. Veh, S. Klepser, B. Khélifi, H. M. Schutte, C. Perennes, D. Glawion, Christoph Deil, Mohanraj Senniappan, A.A. Zdziarski, A. Djannati-Ataï, Y.A. Gallant, Gavin Rowell, Stefan Funk, T. Takahashi, Gianluca Giavitto, Axel Donath, A. W. Chen, M. Bryan, J. Dyks, D. Zaborov, I. Oya, G. Heinzelmann, K. Shiningayamwe, T. Lohse, Yvonne Becherini, M. Renaud, H. Iwasaki, M. Holler, J.-P. Ernenwein, P. Vincent, R. D. Parsons, G. Emery, H. Odaka, Christo Venter, D. Huber, M. Arakawa, D. Berge, M. Capasso, Matteo Cerruti, Nachiketa Chakraborty, F. Niederwanger, A. Marcowith, A. Zech, E. Leser, Jacco Vink, R. Rauth, Sabrina Casanova, C. Arcaro, I. Jung-Richardt, T. Vuillaume, G. Hermann, D. Gottschall, Werner Hofmann, Regis Terrier, J. Becker Tjus, A. Schulz, Carlo Romoli, M. Panter, M. Seglar-Arroyo, H. Ndiyavala, B. van Soelen, Felix Aharonian, M. Haupt, Lukasz Stawarz, Michael Punch, V. Doroshenko, M. Spir-Jacob, R. Tuffs, R. C. G. Chaves, E. O. Angüner, A. Priyana Noel, L. O'c. Drury, S. Saito, J.F. Glicenstein, D. J. van der Walt, S. Raab, Andreas Quirrenbach, C. Steppa, J.-P. Lenain, N. Shafi, K. Egberts, Robert Wagner, K. Kosack, J. Hahn, Reinhard Schlickeiser, M. Tsirou, G. Vasileiadis, M. Kraus, S. Chandra, S. Nakashima, G. Martí-Devesa, M. Katsuragawa, Ruben Lopez-Coto, M.-H. Grondin, M. Böttcher, R. Blackwell, E. Ruiz-Velasco, L. Dirson, Stefan Ohm, Léa Jouvin, S. Pita, F. Schüssler, P. deWilt, J. King, F. Voisin, Julien Lefaucheur, A. Dmytriiev, R. Moderski, S. Gabici, A. Fiasson, J. Lau, L. Oakes, I.D. Davids, Alison Mitchell, L. Rinchiuso, P.J. Meintjes, Heike Prokoph, Zorawar Wadiasingh, R. J. White, S. Fegan, Dieter Horns, V. Poireau, Monica Barnard, P.-O. Petrucci, H. Abdalla, D. Jankowsky, Q. Piel, C. Stegmann, Nu. Komin, Marek Jamrozy, Catherine Boisson, Helene Sol, Pierre Brun, A.S. Seyffert, A. Carosi, M. Füßling, M.A. Kastendieck, S. Bonnefoy, N. Tsuji, F. Gaté, J. Devin, G. Henri, D. A. Prokhorov, D. Tiziani, C. Hoischen, Ullrich Schwanke, A. Specovius, R. Steenkamp, A. Reimer, J. Bregeon, Francois Brun, B. Condon, Michael Backes, H. Yoneda, Tim Holch, M. Tluczykont, E. Moulin, Tomasz Bulik, T. Bylund, A. Jacholkowska, S. Caroff, Celine Armand, F. Jankowsky, Stefan Wagner, Yasunobu Uchiyama, C. van Rensburg, M. Zacharias, C. Trichard, F. Ait Benkhali, Manami Sasaki, S. Schwemmer, Andrea Santangelo, A. Ziegler, G. Maurin, A. Wierzcholska, C. Mariaud, Jacek Niemiec, Olaf Reimer, Thomas Murach, A. Lemière, M. Lemoine-Goumard, I. Shilon, Heinrich J. Völk, R. Marx, P. Bordas, I. Lypova, G. Lamanna, J. Zorn, U. Katz, J.-P. Tavernet, B. Rudak, V. Marandon, K. Katarzyński, A.M. Taylor, V. Sahakian, M. Mohamed, M. Ostrowski, Konrad Bernlöhr, B. Peyaud, G. Pühlhofer, R. Zanin, P. T. O'Brien, Atreyee Sinha, C. van Eldik
Publikováno v:
Nature Astron.
Nature Astron., 2020, 4 (2), pp.167-173. ⟨10.1038/s41550-019-0910-0⟩
Nat.Astron.
Nat.Astron., 2019, 4 (2), pp.167-173. ⟨10.1038/s41550-019-0910-0⟩
Nature Astronomy
Nature Astronomy, Nature Publishing Group, 2019, 28
Digital.CSIC. Repositorio Institucional del CSIC
instname
Nature Astronomy, 4(2). Nature Publishing Group
Nature astronomy 4, 167–173 (2019). doi:10.1038/s41550-019-0910-0
Nature astronomy
Nature Astron., 2020, 4 (2), pp.167-173. ⟨10.1038/s41550-019-0910-0⟩
Nat.Astron.
Nat.Astron., 2019, 4 (2), pp.167-173. ⟨10.1038/s41550-019-0910-0⟩
Nature Astronomy
Nature Astronomy, Nature Publishing Group, 2019, 28
Digital.CSIC. Repositorio Institucional del CSIC
instname
Nature Astronomy, 4(2). Nature Publishing Group
Nature astronomy 4, 167–173 (2019). doi:10.1038/s41550-019-0910-0
Nature astronomy
arXiv:1909.09494v2
H.E.S.S. Collaboration: et al.
The support of the Namibian authorities and of the University of Namibia in facilitating the construction and operation of H.E.S.S. is gratefully acknowledged, as is the support by the Germa
H.E.S.S. Collaboration: et al.
The support of the Namibian authorities and of the University of Namibia in facilitating the construction and operation of H.E.S.S. is gratefully acknowledged, as is the support by the Germa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44a34a2841e1515d845115a83891a46a
https://hal.science/hal-02483963
https://hal.science/hal-02483963
Publikováno v:
Astronomy & Astrophysics, 629:A51. EDP Sciences
Magnetars are regarded as the most magnetized neutron stars in the Universe. Aiming to unveil what kinds of stars and supernovae can create magnetars, we have performed a state-of-the-art spatially resolved spectroscopic X-ray study of the supernova
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38958fffbfd75b9a28a67c02fe1c2891
https://dare.uva.nl/personal/pure/en/publications/spatially-resolved-xray-study-of-supernova-remnants-that-host-magnetars(87d42635-c0c3-451d-978b-c2331faf5302).html
https://dare.uva.nl/personal/pure/en/publications/spatially-resolved-xray-study-of-supernova-remnants-that-host-magnetars(87d42635-c0c3-451d-978b-c2331faf5302).html
Autor:
P. deWilt, J. King, C. Mariaud, J. Zorn, J. Dyks, Matteo Cerruti, Nachiketa Chakraborty, Jacek Niemiec, D. J. van der Walt, Florian Gaté, R. C. G. Chaves, E. O. Angüner, G. Lamanna, S. Nakashima, Olaf Reimer, H. Yoneda, Werner Hofmann, J. Lau, Michelle Tsirou, N. Shafi, Natalia Żywucka, M. de Naurois, Michael Punch, L. Rinchiuso, Michael Backes, Sami Caroff, Thomas Murach, D. A. Prokhorov, K. Kosack, Konrad Bernlöhr, M.-H. Grondin, G. Emery, Stefan Ohm, S. Saito, Axel Donath, A. W. Chen, F. Niederwanger, Markus Böttcher, M. Seglar-Arroyo, S. Pita, G. Pühlhofer, Krzysztof Katarzynski, Tim Holch, Ramin Marx, M. Panter, U. Katz, Jacco Vink, Catherine Boisson, A. Reimer, Marek Jamrozy, Ruizhi Yang, Stefano Gabici, Naomi Tsuji, Emmanuel Moulin, Pierre Brun, V. Marandon, I. Oya, M. Kraus, Helene Sol, I. Shilon, Sabrina Casanova, M. Büchele, F. Ait Benkhali, Anton Dmytriiev, Jean-Pierre Ernenwein, A. Fiasson, Manami Sasaki, L. Oakes, C. Perennes, S. Schwemmer, Andrea Santangelo, J. Bolmont, S. J. Fegan, A. Djannati-Ataï, R. D. Parsons, V. Poireau, Dieter Horns, D. Jankowsky, Johannes Veh, M. Tluczykont, F. Schüssler, A. Schulz, S. Bonnefoy, H. Abdalla, M. A. Kastendieck, T. Chand, G. Vasileiadis, Constantin Steppa, E. de Oña Wilhelmi, Isak Delberth Davids, M. Mohamed, E. Leser, Włodek Kluźniak, Roberta Zanin, Y. A. Gallant, Clemens Hoischen, A. A. Zdziarski, Nu. Komin, Iryna Lypova, Gianluca Giavitto, Heinrich J. Völk, Yvonne Becherini, P. T. O'Brien, Ullrich Schwanke, M. Renaud, B. van Soelen, B. Condon, Riaan Steenkamp, B. Khélifi, G. Hermann, Regis Terrier, Rachel Simoni, Carlo Romoli, Christoph Deil, B. Rudak, D. Gottschall, Anne Lemiere, Justine Devin, Mohanraj Senniappan, A. Carosi, K. Egberts, Masanori Arakawa, Pascal Vincent, H. Odaka, Frank M. Rieger, R. Blackwell, E. Ruiz-Velasco, Thomas Bylund, S. Raab, I. Jung-Richardt, Tadayuki Takahashi, A. S. Seyffert, Atreyee Sinha, Kirsty Feijen, C. van Eldik, Victor Doroshenko, Markus Holler, G. Heinzelmann, Felix Jankowsky, D. Berge, M. Füßling, N. Maxted, R. J. Tuffs, Felix Aharonian, G. Martí-Devesa, H. Prokoph, Jim Hinton, Dmitry Khangulyan, Alison Mitchell, S. Eschbach, Thomas Lohse, H. Iwasaki, L. Tibaldo, J.-P. Tavernet, Kleopas Shiningayamwe, F. Voisin, Reinhard Schlickeiser, S. Colafrancesco, S. Chandra, M. Capasso, Michal Ostrowski, V. Sahakian, J.-P. Lenain, Dmitriy Kostunin, L. Dirson, R. J. White, R. Rauth, Gilles Maurin, Zorawar Wadiasingh, Stefan Funk, Alicja Wierzcholska, Domenico Tiziani, D. Malyshev, Monica Barnard, Thomas Tavernier, B. Peyaud, Maria Haupt, Hester Schutte, L. O'c. Drury, A.M. Taylor, Rafal Moderski, Andreas Specovius, Christo Venter, C. Trichard, P. J. Meintjes, A. Zech, David Sánchez, A. Ziegler, Léa Jouvin, Marion Spir-Jacob, D. Huber, C. Arcaro, Gavin Rowell, M. Bryan, D. Zaborov, C. Moore, Dorit Glawion, Tomasz Bulik, M. Katsuragawa, A. Jacholkowska, Andreas Quirrenbach, Michael Zacharias, Joachim Hahn, P.-O. Petrucci, Stefan Klepser, Łukasz Stawarz, Gilles Henri, Q. Piel, Christian Stegmann, Stefan Wagner, Yasunobu Uchiyama, L. Mohrmann, C. van Rensburg, T. Vuillaume, J. F. Glicenstein, A. Priyana Noel, Francois Brun, J. Bregeon, Celine Armand, Ruben Lopez-Coto, M. Lemoine-Goumard, Gilles Fontaine, A. Marcowith, Hambeleleni Ndiyavala
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 627, pp.A100. ⟨10.1051/0004-6361/201935458⟩
Astronomy and Astrophysics-A&A, 2019, 627, pp.A100. ⟨10.1051/0004-6361/201935458⟩
Astronomy & Astrophysics, 627:A100. EDP Sciences
Astronomy and astrophysics 627, A100 (2019). doi:10.1051/0004-6361/201935458
Dipòsit Digital de la UB
Universidad de Barcelona
Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 627, pp.A100. ⟨10.1051/0004-6361/201935458⟩
Astronomy and Astrophysics-A&A, 2019, 627, pp.A100. ⟨10.1051/0004-6361/201935458⟩
Astronomy & Astrophysics, 627:A100. EDP Sciences
Astronomy and astrophysics 627, A100 (2019). doi:10.1051/0004-6361/201935458
Dipòsit Digital de la UB
Universidad de Barcelona
Pulsar Wind Nebulae (PWNe) represent the most prominent population of Galactic very-high-energy gamma-ray sources and are thought to be an efficient source of leptonic cosmic rays. Vela X is a nearby middle-aged PWN, which shows bright X-ray and TeV
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd6cacb2895f0960b77d79aed4be42dc
http://hdl.handle.net/2445/170899
http://hdl.handle.net/2445/170899
Publikováno v:
Phys.Rev.D
Phys.Rev.D, 2019, 99 (10), pp.103022. ⟨10.1103/PhysRevD.99.103022⟩
Physical Review D
Physical Review D, American Physical Society, 2019, 99 (10), pp.103022. ⟨10.1103/PhysRevD.99.103022⟩
PoS
37th International Cosmic Ray Conference
37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.168, ⟨10.22323/1.395.0168⟩
Phys.Rev.D, 2019, 99 (10), pp.103022. ⟨10.1103/PhysRevD.99.103022⟩
Physical Review D
Physical Review D, American Physical Society, 2019, 99 (10), pp.103022. ⟨10.1103/PhysRevD.99.103022⟩
PoS
37th International Cosmic Ray Conference
37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.168, ⟨10.22323/1.395.0168⟩
The cosmic ray electron spectrum exhibits a break at a particle energy of $\ensuremath{\sim}1\text{ }\text{ }\mathrm{TeV}$ and extends without any attenuation up to $\ensuremath{\sim}20\text{ }\text{ }\mathrm{TeV}$. Synchrotron and inverse Compton en
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cf39bbcdddc1b7edaad142614c5bd68
https://hal.archives-ouvertes.fr/hal-01945018
https://hal.archives-ouvertes.fr/hal-01945018
Autor:
Jacco Vink, Ping Zhou
Publikováno v:
Galaxies, Vol 6, Iss 2, p 46 (2018)
Galaxies; Volume 6; Issue 2; Pages: 46
Galaxies, 6(2):46. MDPI AG
Galaxies; Volume 6; Issue 2; Pages: 46
Galaxies, 6(2):46. MDPI AG
The new generation of X-ray polarisation detectors, gas pixel detectors, which will be employed by the future space missions IXPE and eXTP, allows for spatially resolved X-ray polarisation studies. This will be of particular interest for X-ray synchr
Autor:
Markus M. Hohle, Frank Haberl, Cor P. de Vries, Silvia Zane, Mariano Mendez, Roberto Turolla, Jacco Vink
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 423:1194-1199
RX J0720.4-3125 is the most peculiar object among a group of seven isolated X-ray pulsars (the so-called "Magnificent Seven"), since it shows long-term variations of its spectral and temporal properties on time scales of years. This behaviour was exp