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1. The LOFAR Two-metre Sky Survey: I. Survey description and preliminary data release

Author

Jeremy J. Harwood, Matthias Steinmetz, W. van Driel, Leah K. Morabito, Emanuela Orru, Magdalena Kunert-Bajraszewska, D. A. Rafferty, Isabella Prandoni, A. Horneffer, Huub Röttgering, R. J. van Weeren, Adam Deller, Subhash C. Mandal, J. Sabater, G. Calistro Rivera, M. Sipior, Daniel J. Smith, Frank P. Israel, Aleksandar Shulevski, John McKean, Marijke Haverkorn, D. Engels, Krzysztof T. Chyzy, Chiara Ferrari, P. van der Werf, Philip Best, J. B. R. Oonk, A. Drabent, Elizabeth K. Mahony, Raffaella Morganti, Marisa Brienza, Timothy W. Shimwell, Michael W. Wise, Annalisa Bonafede, Martin J. Hardcastle, Rainer Beck, S. S. Sridhar, Marcus Brüggen, Neal Jackson, Dominik J. Schwarz, M. A. Garrett, Cathy Horellou, Matthias Hoeft, J. A. Zensus, Gianfranco Brunetti, N. R. Mohan, George K. Miley, Andra Stroe, John Conway, Anna D. Kapińska, E. Retana-Montenegro, D. J. McKay, A. O. Clarke, I. van Bemmel, Glenn J. White, George Heald, Volker Heesen, Heino Falcke, Matt J. Jarvis, F. de Gasperin, Huib Intema, D. N. Hoang, Cyril Tasse, R. Pizzo, Eskil Varenius, S. Fröhlich, A. P. Mechev, D. Cseh, Wendy L. Williams, Rossella Cassano, Jonathan T. L. Zwart, T. J. Dijkema, Leiden Observatory [Leiden], Universiteit Leiden, Institute for Astronomy [Edinburgh] (IfA), University of Edinburgh, Centre for Astrophysics Research, University of Hertfordshire [Hatfield] (UH), Netherlands Institute for Radio Astronomy (ASTRON), Hamburger Sternwarte/Hamburg Observatory, Universität Hamburg (UHH), Max-Planck-Institut für Radioastronomie (MPIFR), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University-Smithsonian Institution, Istituto di Radioastronomia [Bologna] (IRA), Istituto Nazionale di Astrofisica (INAF), Astronomical Observatory [Kraków], Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Onsala Space Observatory (OSO), Chalmers University of Technology [Göteborg], Radboud University [Nijmegen], Jodrell Bank Centre for Astrophysics, University of Manchester [Manchester], Oxford Astrophysics, University of Oxford, Department of Physics and Astronomy [Milton Keynes], The Open University [Milton Keynes] (OU), Astronomical Institute Anton Pannekoek (AI PANNEKOEK), University of Amsterdam [Amsterdam] (UvA), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Thüringer Landessternwarte Tautenburg (TLS), Unité Scientifique de la Station de Nançay (USN), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Ruhr-Universität Bochum [Bochum], School of Physics and Astronomy [Southampton], University of Southampton, Joint Institute for VLBI in Europe (JIVE ERIC), Department of Earth and Space Sciences [Göteborg], The University of Western Australia (UWA), Torun Centre for Astronomy (TCfA), Nicolaus Copernicus University [Toruń], University of Oulu, National Centre for Radio Astrophysics [Pune] (NCRA), Tata Institute for Fundamental Research (TIFR), Universität Bielefeld, Leibniz-Institut für Astrophysik Potsdam (AIP), European Southern Observatory (ESO), University of the Western Cape (UWC), European Project: 320745,EC:FP7:ERC,ERC-2012-ADG_20120216,RADIOLIFE(2013), Astronomy, Kapteyn Astronomical Institute, Universiteit Leiden [Leiden], Harvard University [Cambridge]-Smithsonian Institution, Radboud university [Nijmegen], University of Oxford [Oxford], Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), University of the Western Cape, High Energy Astrophys. & Astropart. Phys (API, FNWI), PSL Research University (PSL)-PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Smithsonian Institution-Harvard University [Cambridge], Istituto di Radioastronomia INAF, Jagiellonian University [Krakow] (UJ), Onsala Space Observatory, Istituto di Radioastronomia (IRA), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), and Tata Institute of Fundamental Research [Bombay] (TIFR)

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010504 meteorology & atmospheric sciences, media_common.quotation_subject, Astronomy, radio continuum: general, FOS: Physical sciences, techniques: image processing, 01 natural sciences, Declination, Spectral line, RADIO RECOMBINATION LINES, techniques image processing, surveys, CALIBRATOR SURVEY, 0103 physical sciences, Calibration, radio-continuum, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Remote sensing, media_common, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], image processing [techniques], QUASAR SURVEY, Astronomy and Astrophysics, HERSCHEL-ATLAS, LOFAR, 1ST SURVEY, Galaxy, WIDE-FIELD, Space and Planetary Science, Sky, LUMINOSITY FUNCTION, general, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, general [radio continuum], CHANDRA OBSERVATIONS, Astrophysics - Instrumentation and Methods for Astrophysics, Right ascension, FOLLOW-UP, GALAXY CLUSTERS, surveys – catalogs – radio continuum: general – techniques: image processing, Geology, Noise (radio), catalogs, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120-168 MHz imaging survey that will eventually cover the entire Northern sky. Each of the 3170 pointings will be observed for 8 hrs, which, at most declinations, is sufficient to produce ~5arcsec resolution images with a sensitivity of ~0.1mJy/beam and accomplish the main scientific aims of the survey which are to explore the formation and evolution of massive black holes, galaxies, clusters of galaxies and large-scale structure. Due to the compact core and long baselines of LOFAR, the images provide excellent sensitivity to both highly extended and compact emission. For legacy value, the data are archived at high spectral and time resolution to facilitate subarcsecond imaging and spectral line studies. In this paper we provide an overview of the LoTSS. We outline the survey strategy, the observational status, the current calibration techniques, a preliminary data release, and the anticipated scientific impact. The preliminary images that we have released were created using a fully-automated but direction-independent calibration strategy and are significantly more sensitive than those produced by any existing large-area low-frequency survey. In excess of 44,000 sources are detected in the images that have a resolution of 25arcsec, typical noise levels of less than 0.5 mJy/beam, and cover an area of over 350 square degrees in the region of the HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45d00m00s to 57d00m00s)., Comment: 23 pages, 15 figures, 3 tables, accepted for publication in A&A

Published
2017
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2. First detection in gamma-rays of a young radio galaxy: Fermi-LAT observations of the Compact Symmetric Object PKS 1718-649

Author

Alan Loh, Łukasz Stawarz, Aneta Siemiginowska, Małgorzata A. Sobolewska, Giulia Migliori, Stephane Corbel, Luisa Ostorero, Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University-Smithsonian Institution, Unité Scientifique de la Station de Nançay (USN), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory [Kraków], Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Dipartimento di Fisica [Torino], Università degli studi di Torino = University of Turin (UNITO), Istituto Nazionale di Fisica Nucleare, Sezione di Torino (INFN, Sezione di Torino), Istituto Nazionale di Fisica Nucleare (INFN), ANR-11-IDEX-0005,USPC,Université Sorbonne Paris Cité(2011), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Harvard University [Cambridge]-Smithsonian Institution, Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Università degli studi di Torino (UNITO), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Jagiellonian University [Krakow] (UJ), National Institute for Nuclear Physics (INFN), ANR-11-IDEX-0005-02/10-LABX-0023,UnivEarthS,Earth - Planets - Universe: observation, modeling, transfer(2011), and Migliori, G. and Siemiginowska, A. and Sobolewska, M. and Loh, A. and Corbel, S. and Ostorero, L. and Stawarz, L.

Subjects
gamma-rays: galaxies, Radio galaxy, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics::High Energy Astrophysical Phenomena, jets [galaxies], FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 0103 physical sciences, Blazar, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Spectral index, galaxies: active-galaxies: individual (PKS 1718-649), 010308 nuclear & particles physics, Compton scattering, Astronomy and Astrophysics, galaxies: active, galaxies: individual: PKS 1718, 649, galaxies: jets, gamma rays: galaxies, radiation mechanisms: non-thermal, individual: PKS 1718 [galaxies], galaxies: jets, radiation mechanisms: non-thermal, non-thermal [radiation mechanisms], Galaxy, Massless particle, Interstellar medium, Space and Planetary Science, active [galaxies], galaxies [gamma rays], Astrophysics - High Energy Astrophysical Phenomena, Fermi Gamma-ray Space Telescope
Abstract

We report the $\gamma$-ray detection of a young radio galaxy, PKS 1718$-$649, belonging to the class of Compact Symmetric Objects (CSOs), with the Large Area Telescope (LAT) on board the {\it Fermi} satellite. The third {\it Fermi} Gamma-ray LAT catalog (3FGL) includes an unassociated $\gamma$-ray source, 3FGL J1728.0$-$6446, located close to PKS 1718$-$649. Using the latest Pass 8 calibration, we confirm that the best fit $1 \sigma$ position of the $\gamma$-ray source is compatible with the radio location of PKS 1718$-$649. Cross-matching of the $\gamma$-ray source position with the positions of blazar sources from several catalogs yields negative results. Thus, we conclude that PKS 1718$-$649 is the most likely counterpart to the unassociated LAT source. We obtain a detection test statistics TS$\sim 36$ ($>$5$\sigma$) with a best fit photon spectral index $\Gamma=$2.9$\pm$0.3 and a 0.1-100 GeV photon flux density $F_{\rm 0.1-100GeV}=$(11.5$\pm$0.3)$\times{\rm 10^{-9}}$ ph cm$^{-2}$ s$^{-1}$. We argue that the linear size ($\sim$2 pc), the kinematic age ($\sim$100 years), and the source distance ($z=0.014$) make PKS 1718$-$649 an ideal candidate for $\gamma$-ray detection in the framework of the model proposing that the most compact and the youngest CSOs can efficiently produce GeV radiation via inverse-Compton scattering of the ambient photon fields by the radio lobe non-thermal electrons. Thus, our detection of the source in $\gamma$-rays establishes young radio galaxies as a distinct class of extragalactic high-energy emitters, and yields an unique insight on the physical conditions in compact radio lobes interacting with the interstellar medium of the host galaxy., Comment: 7 pages, 2 figures, accepted for publication in ApJ Letters

Published
2016
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3. Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2

Author

Julien Lefaucheur, J. Biteau, Matteo Cerruti, M. Holler, Matthias Weidinger, F. Krayzel, Tanya Edwards, M. Paz Arribas, Christo Venter, Dirk Lennarz, K. Dutson, F. Spies, Mateusz Janiak, Alexandre Marcowith, C. Jahn, S. Raab, A. Abramowski, C. L. Naumann, R. C. G. Chaves, M. K. Daniel, C. Stegmann, U. F. Katz, R. Moderski, A. Zech, Frank M. Rieger, Gilles Henri, G. Fontaine, Ullrich Schwanke, Iurii Sushch, Werner Hofmann, P. M. Chadwick, Nu. Komin, S. Krakau, Pierre-Olivier Petrucci, A. Fiasson, S. Häffner, Pierre Brun, Ramin Marx, M. Mohamed, A. G. Akhperjanian, Christoph Deil, M. Kieffer, Denis Wouters, T. Kneiske, Stefan Ohm, Aion Viana, V. Sahakian, M. de Naurois, Martin Ward, Jim Hinton, P. Willmann, S. Pita, F. Stinzing, Michal Dyrda, R. Steenkamp, F. Ait Benkhali, S. Schwemmer, B. Opitz, B. Giebels, S. Schwarzburg, Cameron B Rulten, L. O'c. Drury, P. deWilt, E. de Oña Wilhelmi, W. Kluźniak, Sarah Kaufmann, K. Katarzyński, S. J. Nolan, S. Balenderan, S. Klepser, A. C. Clapson, Joachim Hahn, Andrea Santangelo, S. Colafrancesco, Guillaume Dubus, C. Couturier, L. Oakes, M. Tluczykont, Marek Jamrozy, J. Dyks, Andreas Quirrenbach, Łukasz Stawarz, Felix Aharonian, Manuel Meyer, Michael Zacharias, Heinrich J. Völk, Stefan Wagner, Gisela Anton, M. Mayer, Helene Sol, J. Brucker, P.P. Krüger, K. Valerius, R. Chalme-Calvet, M. Panter, R. D. Parsons, J. Harris, Quirin Weitzel, A. Cheesebrough, M. Gajdus, C. Romoli, L. Rob, Elisabetta Bissaldi, Daniel Sánchez, Konrad Bernlöhr, Jan Conrad, K. Stycz, P. Vincent, M. J. Vorster, J. F. Glicenstein, Tomasz Bulik, D. Fernandez, Vincent Marandon, Victor Zabalza, U. Menzler, Gianluca Giavitto, G. Cologna, C. van Eldik, B. van Soelen, I. Jung, B. Rudak, Kathrin Egberts, M. A. Kastendieck, B. Degrange, I. D. Davids, G. Pühlhofer, Markus Böttcher, G. Spengler, M. Füßling, G. Vasileiadis, J. Perez, Y. Cui, Karl Kosack, A. Jacholkowska, A. Reimer, Catherine Boisson, Felix Jankowsky, Fabio Acero, T. J. L. McComb, S. Rosier-Lees, H. Laffon, Andreas Hillert, J. Becker Tjus, T. Vuillaume, Michał Ostrowski, G. Lamanna, W. Domainko, M. Renaud, A. Balzer, M. V. Fernandes, Sabrina Casanova, B. Peyaud, Y. A. Gallant, H.-S. Zechlin, R. White, C. Trichard, Thomas Lohse, A. Wörnlein, M. Grudzińska, P. J. Meintjes, Francois Brun, M. Chrétien, Chia-Chun Lu, Anna Zajczyk, N. W. Pekeur, D. Kolitzus, M. Dalton, Gavin Rowell, A. Djannati-Ataï, Peter Eger, P. Wagner, Guy Pelletier, A. Förster, R. de los Reyes, C. Farnier, Martin Raue, Andrew M. Taylor, B. Khélifi, G. Hermann, Regis Terrier, F. Schüssler, T. Garrigoux, O. Hervet, P. Espigat, D. Klochkov, Marianne Lemoine-Goumard, I. Oya, Jacek Niemiec, A. Lemière, Olaf Reimer, Michael Punch, N. Maxted, Anna Szostek, S. J. Fegan, Thomas Murach, Svenja Carrigan, E. Birsin, Petter Hofverberg, Emmanuel Moulin, André Schulz, J. Méhault, F. Feinstein, Dieter Horns, A. A. Zdziarski, J.-P. Tavernet, Yvonne Becherini, G. Maurin, M. H. Grondin, Francesca Volpe, Helen Poon, A. Lopatin, J.-P. Lenain, Reinhard Schlickeiser, Pol Bordas, Hugh Dickinson, E. O. Angüner, G. Heinzelmann, J. Bolmont, Anna Barnacka, Alicja Wierzcholska, T. Tavernier, Institut für Experimentalphysik [Hamburg], Universität Hamburg (UHH), CEA- Saclay (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Max Planck Institute for Nuclear Physics (MPIK), Max-Planck-Gesellschaft, Dublin Institute for Advanced Studies (DIAS), National Academy of Sciences of the Republic of Armenia [Yerevan] (NAS RA), Humboldt-Universität zu Berlin, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Department of Physics [Durham], University of New Hampshire (UNH), Deutsches Elektronen-Synchrotron [Zeuthen] (DESY), Helmholtz-Gemeinschaft = Helmholtz Association, Universität Potsdam, Astronomical Observatory [Warsaw], Faculty of Physics [Warsaw] (FUW), University of Warsaw (UW)-University of Warsaw (UW), Linnaeus University, Institut für Theoretische Physik IV [Bochum] (ITP4), Ruhr-Universität Bochum [Bochum], Institut f¨ur Astro- und Teilchenphysik and Institut f¨ur Theoretische Physik, Leopold-Franzens Universitat Innsbruck, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), North-West University [South Aftrica] (NWU), Laboratoire Univers et Théories (LUTH (UMR_8102)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut für Astronomie und Astrophysik [Tübingen] (IAAT), Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Harvard-Smithsonian Center for Astrophysics (CfA), Smithsonian Institution-Harvard University [Cambridge], University of the Witwatersrand [Johannesburg] (WITS), Landessternwarte Königstuhl [ZAH] (LSW), Universität Heidelberg [Heidelberg], Stockholm University, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Namibia University of Science and Technology (NUST), University of Adelaide, Oskar Klein Centre [Stockholm], AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG ), Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Astronomy [Leicester], University of Leicester, Instytut Fizyki Jądrowej PAN (IFJ), Polskiej Akademii Nauk, Laboratoire Univers et Particules de Montpellier (LUPM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut für Physik und Astrophysik [Potsdam], Obserwatorium Astronomiczne, Uniwersytet Jagiello?ski, Torun Centre for Astronomy (TCfA), Nicolaus Copernicus University [Toruń], University of the Free State [South Africa], Université Pierre et Marie Curie - Paris 6 - UFR de Médecine Pierre et Marie Curie (UPMC), Université Pierre et Marie Curie - Paris 6 (UPMC), Astronomical Observatory [Kraków], Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Institut für Experimentalphysik [Innsbruck], Universität Innsbruck [Innsbruck], Institute of Astronomy [Prague], Charles University [Prague] (CU), HESS, H.E.S.S. Collaboration, Humboldt University Of Berlin, University of Potsdam = Universität Potsdam, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Harvard University-Smithsonian Institution, Universität Heidelberg [Heidelberg] = Heidelberg University, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), University of the Free State [South Africa] (UFS), 24420530 - Böttcher, Markus, 23909196 - Casanova, Sabrina, 13146629 - Davids, Isak Delberth, 11749903 - Krüger, Petrus Paulus, 22050574 - Pekeur, Nicolette Whilna, 24922986 - Sushch, Iurii, 12006653 - Venter, Christo, and 12792322 - Vorster, Michael Johannes

Subjects
Photon, ISM: individual objects: HESS J1832−093, Point source, Astrophysics::High Energy Astrophysical Phenomena, Hochenergie-Astrophysik Theorie - Abteilung Hofmann, Gamma rays: general, FOS: Physical sciences, Cosmic ray, Astrophysics, individual objects: HESS J1832−093 [ISM], Pulsar wind nebula, general. [Gamma-rays], Astroparticle physics, Gamma-rays: general, ISM: individual objects: HESS J1832-093, ISM: individual objects: SNR G22.7-0.2, Astronomy and Astrophysics, Space and Planetary Science, individual objects: SNR G22.7−0.2 [ISM], Supernova remnant, HESS - Abteilung Hofmann, Astrophysics::Galaxy Astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Molecular cloud, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Gamma ray, Institut für Physik und Astronomie, Astronomy, ddc:520, High Energy Physics::Experiment, ISM: individual objects: SNR G22.7−0.2, Astrophysics - High Energy Astrophysical Phenomena, general [gamma-rays]
Abstract

Monthly notices of the Royal Astronomical Society 446(2), 1163 - 1169 (2015). doi:10.1093/mnras/stu2148, The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832−093, at the position $RA=18^{h}32^{m}50^{s} \pm 3^{s}_{stat}\pm2^{s}_{syst},Dec=−9^\circ22^{\prime} 36^{\prime\prime} \pm 32^{\prime\prime}_{stat} \pm 20^{\prime\prime}_{syst}(J2000)$, spatially coincident with a part of the radio shell of the neighbouring remnant G22.7−0.2. The photon spectrum is well described by a power law of index Γ = 2.6 $\pm$ 0.3$_{stat}$ $\pm$ 0.1$_{syst}$ and a normalization at 1 TeV of Φ$_{0}=(4.8 \pm 0.8_{stat} \pm 1.0_{syst}) ×10^{−13}cm^{−2}s^{−1}TeV^{−1}$. The location of the gamma-ray emission on the edge of the SNR rim first suggested a signature of escaping cosmic rays illuminating a nearby molecular cloud. Then a dedicated XMM–Newton observation led to the discovery of a new X-ray point source spatially coincident with the TeV excess. Two other scenarios were hence proposed to identify the nature of HESS J1832−093. Gamma-rays from inverse Compton radiation in the framework of a pulsar wind nebula scenario or the possibility of gamma-ray production within a binary system are therefore also considered. Deeper multiwavelength observations will help to shed new light on this intriguing VHE source., Published by Oxford Univ. Press, Oxford

Published
2015
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4. Observations and Analysis of the Eccentric Orbit Eclipsing Binary HP Draconis

Author

Eugene F. Milone, M. Kurpinska-Winiarska, E. Oblak, University of Calgary, Astronomical Observatory [Kraków], Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
Physics, 010504 meteorology & atmospheric sciences, Apsidal precession, Theoretical models, Binary number, binaries: eclipsing, Astronomy and Astrophysics, Orbital eccentricity, Astrophysics, 01 natural sciences, Omega, Radial velocity, Photometry (optics), stars: individual (HP Draconis), Secondary component, Space and Planetary Science, 0103 physical sciences, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract

We present results of an analysis of all available data of the double-lined spectroscopic and eclipsing binary HP Draconis. The analyses make use of unpublished radial velocity (RV) and extensive photoelectric photometry data as well as published Hipparcos photometric observations and RV data from Asiago Observatory. The system is eccentric and the current analyses suggest apsidal motion to be present only weakly, but a significant amount of third light is found in all three passbands, B, V, and hip. Relatively high precision has been achieved for the mass and radius among the absolute parameters with fractional error of 0.95% or better: M{sub 1,2} = 1.133 {+-} 0.005, 1.094 {+-} 0.007 M{sub sun}; R{sub 1,2} = 1.371 {+-} 0.012, 1.052 {+-} 0.010 R{sub sun}. Other derived parameters are P = 10.76152 {+-} 0.00019 days, a = 26.79 {+-} 0.04 R{sub sun}, e = 0.0367 {+-} 0.0009, {omega} = 0.693 {+-} 0.037, q = 0.966 {+-} 004, and {Delta}T = 105 {+-} 5 K. We derive a distance to the system of 77 {+-} 3 pc. Comparison with Padova theoretical models for different chemical compositions suggests that the components may be of solar age and roughly solar composition, with the primary componentmore » less than half as dense as the secondary component and slightly evolved off the zero-age main sequence.« less

Published
2010
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5. A numerical analysis of chaos in the double pendulum

Author

Toshio Okada, Tomasz Stachowiak, Astronomical Observatory [Kraków], Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), and Tokyo University of Agriculture and Technology (TUAT)

Subjects
Period-doubling bifurcation, Lyapunov function, Double pendulum, General Mathematics, Applied Mathematics, Numerical analysis, Mathematical analysis, General Physics and Astronomy, Statistical and Nonlinear Physics, Bifurcation diagram, 01 natural sciences, symbols.namesake, [SPI]Engineering Sciences [physics], Classical mechanics, Integrator, 0103 physical sciences, symbols, Limit (mathematics), 010306 general physics, 010301 acoustics, Bifurcation, Mathematics
Abstract

International audience; We analyse the double pendulum system numerically, using a modified mid point integrator. Poincaré sections and bifurcation diagrams are constructed for certain, characteristic values of energy. The largest Lyapunov characteristic exponents are also calculated. All three methods confirm the passing of the system from the regular low energy limit into chaos as energy is increased.

Published
2006
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6. An automatic method to determine the frequency scale of the ionospheric Alfvén resonator using data from Hylaty station, Poland

Author

Jerzy Kubisz, Andrzej Kulak, Adam Michalec, Anna Odzimek, Institute of Physics, Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), and Astronomical Observatory [Kraków]

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, Meteorology, Scale (ratio), Acoustics, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, 010502 geochemistry & geophysics, 01 natural sciences, ionosphere (mid-latitude ionosphere), Resonator, Earth and Planetary Sciences (miscellaneous), Range (statistics), lcsh:Science, 0105 earth and related environmental sciences, Physics, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Signal processing, lcsh:QC801-809, Geology, Astronomy and Astrophysics, lcsh:QC1-999, radio science (electromagnetic noise and interference, signal processing), Magnetic field, lcsh:Geophysics. Cosmic physics, Space and Planetary Science, Middle latitudes, Harmonics, lcsh:Q, Ionosphere, lcsh:Physics
Abstract

ULF/ELF magnetic field data recorded at the "Hylaty" station in Poland (49°19' N, 22°56' E; L≃2) are analysed to find the characteristics of spectral resonance structures (SRS) in the frequency range 1–5 Hz, related to the ionospheric Alfvén resonator (IAR). An automatic procedure is employed to SRS events observed at "Hylaty" during the nighttime in 2001–2003, to calculate the parameter which determines the separation between the harmonics of the resonator, termed the frequency scale. Diurnal and seasonal variations of the frequency scale within the range of 0.4–0.8 Hz have been found. The usefulness and disadvantages of this particular method of SRS analysis, and of other methods, are discussed.

Published
2006

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