P
Paolo Padovani
Researcher at European Southern Observatory
Publications - 269
Citations - 24184
Paolo Padovani is an academic researcher from European Southern Observatory. The author has contributed to research in topics: Blazar & Quasar. The author has an hindex of 66, co-authored 261 publications receiving 21953 citations. Previous affiliations of Paolo Padovani include European Space Agency & Yunnan University.
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Journal ArticleDOI
Unified Schemes for Radio-Loud Active Galactic Nuclei
C. Megan Urry,Paolo Padovani +1 more
TL;DR: In this paper, the authors describe the radio-loud active galactic nuclei (AGN) classification and general properties of AGN, including radio galaxies, quasars, and blazars.
Journal ArticleDOI
Unified Schemes for Radio-Loud Active Galactic Nuclei
C. Megan Urry,Paolo Padovani +1 more
TL;DR: In this article, the authors describe radio-loud active galactic nuclei (AGN) and summarize the evidence for anisotropic emission, and outline the two most plausible unified schemes.
Journal ArticleDOI
The Great Observatories Origins Deep Survey: Initial results from optical and near-infrared imaging
Mauro Giavalisco,Henry C. Ferguson,Henry C. Ferguson,Anton M. Koekemoer,Mark Dickinson,Mark Dickinson,David M. Alexander,Franz E. Bauer,Jacqueline Bergeron,C. Biagetti,W. N. Brandt,Stefano Casertano,C. J. Cesarsky,E. Chatzichristou,Christopher J. Conselice,Stefano Cristiani,L. N. da Costa,Tomas Dahlen,Duilia F. de Mello,Peter Eisenhardt,T. Erben,S. M. Fall,Christopher D. Fassnacht,R. A. E. Fosbury,R. A. E. Fosbury,A. S. Fruchter,Jonathan P. Gardner,Norman A. Grogin,Richard Hook,A. E. Hornschemeier,R. Idzi,Shardha Jogee,C. Kretchmer,Victoria G. Laidler,Kyoung-Soo Lee,Mario Livio,Ray A. Lucas,Piero Madau,Bahram Mobasher,Bahram Mobasher,Leonidas A. Moustakas,Mario Nonino,Paolo Padovani,Paolo Padovani,Casey Papovich,Yousin Park,Swara Ravindranath,Alvio Renzini,M. Richardson,Adam G. Riess,Piero Rosati,Mischa Schirmer,Mischa Schirmer,Ethan J. Schreier,Rachel S. Somerville,H. Spinrad,Daniel Stern,Massimo Stiavelli,Louis Gregory Strolger,C. M. Urry,B. Vandame,Roy Williams,Christian Wolf +62 more
TL;DR: The GOODS survey as mentioned in this paper is based on multiband imaging data obtained with the Hubble Space Telescope and the Advanced Camera for Surveys (ACS) and covers roughly 320 arcmin2 in the ACS F435W, F606w, F814W, and F850LP bands, divided into two well-studied fields.
Journal ArticleDOI
The spectral energy distribution of fermi bright blazars
A. A. Abdo,A. A. Abdo,Markus Ackermann,Ivan Agudo,Marco Ajello,Hugh D. Aller,Margo F. Aller,Emmanouil Angelakis,A. A. Arkharov,Magnus Axelsson,Magnus Axelsson,Uwe Bach,Luca Baldini,Jean Ballet,Guido Barbiellini,Denis Bastieri,B. M. Baughman,Keith Bechtol,Ronaldo Bellazzini,Erika Benítez,Andrei Berdyugin,B. Berenji,Roger Blandford,E. D. Bloom,Markus Boettcher,Emanuele Bonamente,A. W. Borgland,Johan Bregeon,A. Brez,M. Brigida,P. Bruel,T. H. Burnett,David N. Burrows,S. Buson,G. A. Caliandro,L. Calzoletti,R. A. Cameron,M. Capalbi,P. A. Caraveo,D. Carosati,J. M. Casandjian,E. Cavazzuti,C. Cecchi,Omer Celik,Omer Celik,E. Charles,Sylvain Chaty,A. Chekhtman,A. Chekhtman,Wen Ping Chen,James Chiang,G. Chincarini,Stefano Ciprini,R. Claus,Johann Cohen-Tanugi,S. Colafrancesco,L. R. Cominsky,Jan Conrad,Jan Conrad,L. Costamante,S. Cutini,F. D'Ammando,R. Deitrick,V. D'Elia,Charles D. Dermer,A. De Angelis,F. de Palma,Seth Digel,I. Donnarumma,E. Do Couto E Silva,Persis S. Drell,R. Dubois,Deborah Dultzin,D. Dumora,A. D. Falcone,C. Farnier,C. Favuzzi,S. J. Fegan,W. B. Focke,E. Forné,P. Fortin,Marco Frailis,Lars Fuhrmann,Yasushi Fukazawa,Stefan Funk,P. Fusco,José L. Gómez,F. Gargano,Dario Gasparrini,Neil Gehrels,S. Germani,B. Giebels,Nicola Giglietto,Paolo Giommi,F. Giordano,A. Giuliani,T. Glanzman,G. Godfrey,I. A. Grenier,Caryl Gronwall,J. E. Grove,L. Guillemot,L. Guillemot,Sylvain Guiriec,Mark Gurwell,D. Hadasch,Y. Hanabata,Alice K. Harding,M. Hayashida,E. Hays,S. E. Healey,Jochen Heidt,David Hiriart,D. Horan,E. A. Hoversten,R. E. Hughes,Ryosuke Itoh,Miranda Jackson,Miranda Jackson,Gudlaugur Johannesson,A. S. Johnson,W. N. Johnson,Svetlana G. Jorstad,Matthias Kadler,T. Kamae,Hideaki Katagiri,Jun Kataoka,Nobuyuki Kawai,J. A. Kennea,Matthew Kerr,Givi N. Kimeridze,Jürgen Knödlseder,M. L. Kocian,E. N. Kopatskaya,Ekaterina Koptelova,Tatiana S. Konstantinova,Yuri Y. Kovalev,Yu. A. Kovalev,Omar M. Kurtanidze,M. Kuss,J. Lande,Valeri M. Larionov,Luca Latronico,Paolo Leto,Elina Lindfors,Francesco Longo,F. Loparco,Benoit Lott,M. N. Lovellette,P. Lubrano,Grzegorz Madejski,A. Makeev,A. Makeev,P. Marchegiani,Alan P. Marscher,F. E. Marshall,Walter Max-Moerbeck,M. N. Mazziotta,W. McConville,W. McConville,Julie McEnery,Julie McEnery,C. Meurer,Peter F. Michelson,W. Mitthumsiri,Tsunefumi Mizuno,A. A. Moiseev,A. A. Moiseev,C. Monte,M. E. Monzani,A. Morselli,Igor V. Moskalenko,S. Murgia,I. Nestoras,K. Nilsson,N. A. Nizhelsky,P. L. Nolan,J. P. Norris,E. Nuss,T. Ohsugi,Roopesh Ojha,Nicola Omodei,E. Orlando,Jonathan F. Ormes,J. P. Osborne,M. Ozaki,L. Pacciani,Paolo Padovani,C. Pagani,K. L. Page,David Paneque,J. H. Panetta,D. Parent,M. Pasanen,Vasiliki Pavlidou,V. Pelassa,M. Pepe,M. Perri,Melissa Pesce-Rollins,S. Piranomonte,F. Piron,C. Pittori,T. A. Porter,Simonetta Puccetti,Farid Rahoui,S. Rainò,C. M. Raiteri,Robert R. Rando,M. Razzano,A. Reimer,A. Reimer,Olaf Reimer,Olaf Reimer,T. Reposeur,Joseph L. Richards,Steven Ritz,L.S. Rochester,A. Y. Rodriguez,Roger W. Romani,J. A. Ros,M. Roth,P. Roustazadeh,Felix Ryde,Felix Ryde,H. F.W. Sadrozinski,A. C. Sadun,David Sánchez,A. Sander,P. M. Saz Parkinson,Jeffrey D. Scargle,A. Sellerholm,Carmelo Sgrò,M. S. Shaw,Lorand A. Sigua,E. J. Siskind,David A. Smith,P. D. Smith,Gloria Spandre,P. Spinelli,Jean-Luc Starck,Mark Stevenson,G. Stratta,M. S. Strickman,D. J. Suson,H. Tajima,Hiromitsu Takahashi,Tadayuki Takahashi,L. O. Takalo,Takaaki Tanaka,J. B. Thayer,J. G. Thayer,D. J. Thompson,L. Tibaldo,Diego F. Torres,Gino Tosti,A. Tramacere,A. Tramacere,Yasunobu Uchiyama,T. L. Usher,V. Vasileiou,V. Vasileiou,F. Verrecchia,N. Vilchez,M. Villata,V. Vitale,A. P. Waite,Paul J. Wang,Brian L Winer,K. S. Wood,T. Ylinen,T. Ylinen,J. A. Zensus,G. V. Zhekanis,M. Ziegler +273 more
Abstract: We have conducted a detailed investigation of the broadband spectral properties of the gamma-ray selected blazars of the Fermi LAT Bright AGN Sample (LBAS). By combining our accurately estimated Fermi gamma-ray spectra with Swift, radio, infra-red, optical, and other hard X-ray/gamma-ray data, collected within 3 months of the LBAS data taking period, we were able to assemble high-quality and quasi-simultaneous spectral energy distributions (SED) for 48 LBAS blazars. The SED of these gamma-ray sources is similar to that of blazars discovered at other wavelengths, clearly showing, in the usual log nu-log nu F-nu representation, the typical broadband spectral signatures normally attributed to a combination of low-energy synchrotron radiation followed by inverse Compton emission of one or more components. We have used these SED to characterize the peak intensity of both the low-and the high-energy components. The results have been used to derive empirical relationships that estimate the position of the two peaks from the broadband colors (i.e., the radio to optical, alpha(ro), and optical to X-ray, alpha(ox), spectral slopes) and from the gamma-ray spectral index. Our data show that the synchrotron peak frequency (nu(S)(peak)) is positioned between 10(12.5) and 10(14.5) Hz in broad-lined flat spectrum radio quasars (FSRQs) and between 10(13) and 10(17) Hz in featureless BL Lacertae objects. We find that the gamma-ray spectral slope is strongly correlated with the synchrotron peak energy and with the X-ray spectral index, as expected at first order in synchrotron-inverse Compton scenarios. However, simple homogeneous, one-zone, synchrotron self-Compton (SSC) models cannot explain most of our SED, especially in the case of FSRQs and low energy peaked (LBL) BL Lacs. More complex models involving external Compton radiation or multiple SSC components are required to reproduce the overall SED and the observed spectral variability. While more than 50% of known radio bright high energy peaked (HBL) BL Lacs are detected in the LBAS sample, only less than 13% of known bright FSRQs and LBL BL Lacs are included. This suggests that the latter sources, as a class, may be much fainter gamma-ray emitters than LBAS blazars, and could in fact radiate close to the expectations of simple SSC models. We categorized all our sources according to a new physical classification scheme based on the generally accepted paradigm for Active Galactic Nuclei and on the results of this SED study. Since the LAT detector is more sensitive to flat spectrum gamma-ray sources, the correlation between nu(S)(peak) and gamma-ray spectral index strongly favors the detection of high energy peaked blazars, thus explaining the Fermi overabundance of this type of sources compared to radio and EGRET samples. This selection effect is similar to that experienced in the soft X-ray band where HBL BL Lacs are the dominant type of blazars.
Journal ArticleDOI
Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert
M. G. Aartsen,Markus Ackermann,Jenni Adams,Juan A. Aguilar,Markus Ahlers,Maryon Ahrens,Imen Al Samarai,David Altmann,Karen Andeen,Tyler Anderson,I. Ansseau,Gisela Anton,Carlos Arguelles,Bruno Arsioli,J. Auffenberg,Spencer Axani,Hadis Bagherpour,Xinhua Bai,Jared Barron,Steven W. Barwick,Volker Baum,R. C. Bay,J. J. Beatty,K. H. Becker,Julia Becker Tjus,Segev BenZvi,D. Berley,Elisa Bernardini,D. Z. Besson,Gary Binder,Daniel Bindig,E. Blaufuss,Summer Blot,Christian Bohm,Mathis Boerner,Fabian Bös,S. Boeser,Olga Botner,Etienne Bourbeau,James Bourbeau,Federica Bradascio,Jim Braun,Martin Brenzke,H.-P. Bretz,Stephanie Bron,Jannes Brostean-Kaiser,Alexander Burgman,Raffaela Busse,Tessa Carver,Edward Cheung,Dmitry Chirkin,A. Christov,Kenneth Clark,Lew Classen,S. Coenders,Gabriel Collin,Janet Conrad,Paul Coppin,Pablo Correa,D. F. Cowen,Robert A. Cross,Pranav Dave,Melanie Day,João Pedro Athayde Marcondes de André,Catherine De Clercq,James DeLaunay,Hans Dembinski,Sam DeRidder,Paolo Desiati,Krijn de Vries,Gwenhael DeWasseige,Meike DeWith,T. DeYoung,J. C. Díaz-Vélez,Vincenzo Di Lorenzo,Hrvoje Dujmovic,J. P. Dumm,Matt Dunkman,Emily Dvorak,Benjamin Eberhardt,Thomas Ehrhardt,Bjorn Eichmann,Philipp Eller,Paul Evenson,Sam Fahey,A. R. Fazely,J. Felde,Kirill Filimonov,Chad Finley,S. Flis,Anna Franckowiak,Elizabeth Friedman,Alexander Fritz,Thomas K. Gaisser,Jay Gallagher,L. Gerhardt,Kevin Ghorbani,Paolo Giommi,Theo Glauch,Thorsten Gluesenkamp,A. Goldschmidt,Javier Gonzalez,Darren Grant,Zachary Griffith,Christian Haack,Allan Hallgren,Francis Halzen,Kael Hanson,Dustin Hebecker,D. Heereman,K. Helbing,Robert Hellauer,Stephanie Hickford,Joshua Hignight,G. C. Hill,Kara Hoffman,Ruth Hoffmann,Tobias Hoinka,Benjamin Hokanson-Fasig,K. Hoshina,F. Huang,Matthias Huber,Klas Hultqvist,Mirco Huennefeld,Raamis Hussain,Seongjin In,Nadège Iovine,Aya Ishihara,Emanuel Jacobi,George Japaridze,Minjin Jeong,Kyle Jero,B. J. P. Jones,Piotr Kalaczyński,Woosik Kang,Alexander Kappes,David Kappesser,Timo Karg,Albrecht Karle,Uli Katz,Matt Kauer,Azadeh Keivani,John Kelley,Ali Kheirandish,JongHyun Kim,M. S. Kim,Thomas Kintscher,Joanna Kiryluk,Thomas Kittler,Spencer Klein,Ramesh Koirala,Hermann Kolanoski,Lutz Koepke,Claudio Kopper,Sandro Kopper,Jan Paul Koschinsky,Jason Koskinen,Marek Kowalski,Benedikt Krammer,K. Krings,M. Kroll,Gerald Krueckl,Samridha Kunwar,Naoko Kurahashi Neilson,Takao Kuwabara,Alexander Kyriacou,M. Labare,Justin Lanfranchi,Michael J Larson,Frederik Hermann Lauber,Kayla Leonard,Mariola Lesiak-Bzdak,M. Leuermann,Qinrui Liu,Cristian Jesus Lozano Mariscal,Lu Lu,Jan Luenemann,William Luszczak,James Madsen,G. Maggi,Kendall Mahn,Sarah Mancina,Reina H. Maruyama,K. Mase,Ryan Maunu,K. Meagher,Morten Medici,Maximilian Meier,Thorben Menne,G. Merino,Thomas Meures,Sandy Miarecki,Jessie Micallef,Giulio Momente,Teresa Montaruli,Roger Moore,Robert Morse,Marjon Moulai,R. Nahnhauer,Prabandha Nakarmi,Uwe Naumann,Garrett Neer,Hans Niederhausen,Sarah Nowicki,Dave Nygren,Anna Obertacke Pollmann,A. Olivas,Aongus Ó Murchadha,Erin O'Sullivan,Paolo Padovani,T. Palczewski,Hershal Pandya,Daria Pankova,Peter Peiffer,James F. Pepper,Carlos Perez de los Heros,Damian Pieloth,E. Pinat,M. Plum,B Price,Gerald Przybylski,Christoph Raab,Leif Raedel,Mohamed Rameez,K. Rawlins,Immacolata Carmen Rea,René Reimann,Ben Relethford,Matt Relich,Elisa Resconi,Wolfgang Rhode,Mike Richman,Sally Robertson,Martin Rongen,Carsten Rott,Tim Ruhe,Dirk Ryckbosch,Devyn Rysewyk,Ibrahim Safa,Tobias Saelzer,Narek Sahakyan,Sebastian Sanchez Herrera,Alexander Sandrock,Joakim Sandroos,Marcos Santander,Sourav Sarkar,Subir Sarkar,Konstancja Satalecka,Philipp Schlunder,Torsten Schmidt,Austin Schneider,Sebastian Schoenen,Sebastian Schoeneberg,Lisa Johanna Schumacher,Stephen Sclanfani,D. Seckel,S. Seunarine,Jan Soedingrekso,Dennis Soldin,Ming Song,Glenn Spiczak,Christian Spiering,Juliana Stachurska,Michael Stamatikos,Todor Stanev,A. Stasik,Joeran Stettner,Anna Steuer,T. Stezelberger,R. G. Stokstad,A. Stoessl,Nora Linn Strotjohann,Thomas Stuttard,G. W. Sullivan,Michael Sutherland,Ignacio Taboada,Joulien Tatar,Frederik Tenholt,Samvel Ter-Antonyan,A. Terliuk,S. Tilav,P. A. Toale,Moriah Tobin,C. Toennis,Simona Toscano,Delia Tosi,Maria Tselengidou,Chunfai Tung,Andrea Turcati,Colin Turley,Bunheng Ty,Lisa Unger,Marcel Usner,Ward Van Driessche,Daan van Eijk,Nick van Eijndhoven,Justin Vandenbroucke,Sander Vanheule,Jakob van Santen,Eric Vogel,Matthias Vraeghe,C. Walck,Alexander Wallace,M. Wallraff,Frank Wandler,Nancy Wandkowsky,Aatif Waza,Chris Weaver,Matthew Weiss,Chris Wendt,Johannes Werthebach,S. Westerhoff,Ben Whelan,Nathan Whitehorn,Klaus Wiebe,Christopher Wiebusch,Logan Wille,Dawn Williams,Lizz Wills,Martin Wolf,Joshua A. Wood,Tania Wood,Kurt Woschnagg,Donglian Xu,Xianwu Xu,Yiqian Xu,Juan Pablo Yanez,G. B. Yodh,S. Yoshida,Tianlu Yuan +329 more
TL;DR: In this article, a high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056.