J
J. L. Richards
Researcher at Purdue University
Publications - 72
Citations - 5064
J. L. Richards is an academic researcher from Purdue University. The author has contributed to research in topics: Blazar & Quasar. The author has an hindex of 41, co-authored 72 publications receiving 4780 citations. Previous affiliations of J. L. Richards include California Institute of Technology.
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Journal ArticleDOI
Mojave. x. parsec-scale jet orientation variations and superluminal motion in active galactic nuclei
Matthew L. Lister,M. F. Aller,Hugh D. Aller,Daniel C. Homan,K. I. Kellermann,Yuri Y. Kovalev,Yuri Y. Kovalev,Alexander B. Pushkarev,Alexander B. Pushkarev,J. L. Richards,Eduardo Ros,Eduardo Ros,Tuomas Savolainen +12 more
TL;DR: In this article, the parsec-scale kinematics of 200 active galactic nucleus (AGN) jets based on 15 GHz Very Long Baseline Array (VLBA) data obtained between 1994 August 31 and 2011 May 1 were described.
Journal ArticleDOI
MOJAVE. X. Parsec-Scale Jet Orientation Variations and Superluminal Motion in AGN
Matthew L. Lister,M. F. Aller,Hugh D. Aller,D. C. Homan,K. I. Kellermann,Yuri Y. Kovalev,Alexander B. Pushkarev,J. L. Richards,Eduardo Ros,Tuomas Savolainen +9 more
TL;DR: In this article, the parsec-scale kinematics of 200 AGN jets based on 15 GHz VLBA data obtained between 1994 Aug 31 and 2011 May 1 are described.
Journal ArticleDOI
Modulated High-Energy Gamma-Ray Emission from the Microquasar Cygnus X-3
A. A. Abdo,Markus Ackermann,Marco Ajello,Magnus Axelsson,Luca Baldini,Jean Ballet,Guido Barbiellini,Denis Bastieri,B. M. Baughman,Keith Bechtol,R. Bellazzini,B. Berenji,Roger Blandford,Elliott D. Bloom,Emanuele Bonamente,A. W. Borgland,A. Brez,M. Brigida,Pascal Bruel,T. H. Burnett,Sara Buson,G. A. Caliandro,P. A. Caraveo,J. M. Casandjian,Claudia Cecchi,Ö. Çelik,Sylvain Chaty,C. C. Cheung,James Chiang,Stefano Ciprini,R. Claus,Johann Cohen-Tanugi,L.R. Cominski,Jan Conrad,Stephane Corbel,R. H. D. Corbet,Charles D. Dermer,F. de Palma,S. W. Digel,E. Do Couto E Silva,Persis S. Drell,Richard Dubois,Guillaume Dubus,D. Dumora,C. Farnier,C. Favuzzi,S. J. Fegan,W. B. Focke,P. Fortin,Marco Frailis,P. Fusco,F. Gargano,Neil Gehrels,S. Germani,Gianluca Giavitto,B. Giebels,Nicola Giglietto,F. Giordano,T. Glanzman,G.L. Godfrey,I. A. Grenier,M.-H. Grondin,J. E. Grove,L. Guillemot,Sylvain Guiriec,Y. Hanabata,Alice K. Harding,M. Hayashida,E. Hays,A. B. Hill,L. Hjalmarsdotter,D. Horan,R. E. Hughes,M. Jackson,Gudlaugur Johannesson,A. S. Johnson,Tyrel J. Johnson,W. N. Johnson,T. Kamae,Hideaki Katagiri,N. Kawai,Matthew Kerr,Jürgen Knödlseder,M. L. Kocian,Elmar Koerding,M. Kuss,J. Lande,Luca Latronico,M. Lemoine-Goumard,Francesco Longo,F. Loparco,B. Lott,M. N. Lovellette,P. Lubrano,G. M. Madejski,A. Makeev,L. Marchand,M. Marelli,Walter Max-Moerbeck,M. N. Mazziotta,N. Mccoll,Julie McEnery,C. Meurer,Peter F. Michelson,Simone Migliari,W. Mitthumsiri,Tsunefumi Mizuno,C. Monte,M. E. Monzani,A. Morselli,Igor V. Moskalenko,S. Murgia,P. L. Nolan,J. P. Norris,E. Nuss,T. Ohsugi,Nicola Omodei,R. A. Ong,Jonathan F. Ormes,David Paneque,D. Parent,V. Pelassa,M. Pepe,Melissa Pesce-Rollins,F. Piron,Guy G. Pooley,T. A. Porter,Katja Pottschmidt,S. Rainò,R. Rando,Paul S. Ray,M. Razzano,Nanda Rea,Anthony C. S. Readhead,A. Reimer,Olaf Reimer,J. L. Richards,L.S. Rochester,J. L. Rodriguez,A. Y. Rodriguez,Roger W. Romani,Felix Ryde,H.F-W. Sadrosinski,A. Sander,P. M. Saz Parkinson,G. Sgro,E. J. Siskind,David Smith,P. D. Smith,P. Spinelli,Jean-Luc Starck,Mark Stevenson,M. S. Strickman,Hiromitsu Takahashi,Yasuyuki T. Tanaka,J. B. Thayer,D. J. Thompson,L. Tibaldo,John A. Tomsick,Diego F. Torres,G. Tosti,Andrea Tramacere,Y. Uchiyama,T. L. Usher,V. Vasileiou,N. Vilchez,V. Vitale,A. P. Waite,Paul J. Wang,Jörn Wilms,Brian L Winer,K. S. Wood,T. Ylinen,M. Ziegler +173 more
TL;DR: The Fermi Large Area Telescope has detected a variable high-energy source coinciding with the position of the x-ray binary and microquasar Cygnus X-3, opening new areas in which to study the formation of relativistic jets.
Journal ArticleDOI
Simultaneous Planck, Swift, and Fermi observations of X-ray and gamma-ray selected blazars
P. Giommi,G. Polenta,Anne Lähteenmäki,D. J. Thompson,M. Capalbi,S. Cutini,D. Gasparrini,J. González-Nuevo,Jonathan León-Tavares,M. López-Caniego,Mn Mazziotta,C. Monte,M. Perri,S. Rainò,G. Tosti,Andrea Tramacere,F. Verrecchia,Hugh D. Aller,M. F. Aller,Emmanouil Angelakis,D. Bastieri,Andrei Berdyugin,Anna Bonaldi,Laura Bonavera,Carlo Burigana,David N. Burrows,S. Buson,E. Cavazzuti,G. Chincarini,S. Colafrancesco,Luigi Costamante,F. Cuttaia,F. D'Ammando,G. de Zotti,M. Frailis,L. Fuhrmann,S. Galeotta,F. Gargano,N. Gehrels,Nicola Giglietto,Francesco Giordano,Marcello Giroletti,E. Keihänen,O. King,Thomas P. Krichbaum,Anthony Lasenby,N. Lavonen,Charles R. Lawrence,C. Leto,Elina Lindfors,N. Mandolesi,Marcella Massardi,Walter Max-Moerbeck,P. F. Michelson,M. G. Mingaliev,Paolo Natoli,I. Nestoras,E. Nieppola,Kari Nilsson,B. Partridge,Vasiliki Pavlidou,T. J. Pearson,Pietro Procopio,Jörg P. Rachen,A. C. S. Readhead,R. Reeves,A. Reimer,R. Reinthal,S. Ricciardi,J. L. Richards,D. Riquelme,Jari Saarinen,Anna Sajina,M. Sandri,P. Savolainen,A. Sievers,A. Sillanpää,Yu. V. Sotnikova,Mark Stevenson,G. Tagliaferri,L. O. Takalo,Joni Tammi,D. Tavagnacco,Luca Terenzi,L. Toffolatti,Merja Tornikoski,Corrado Trigilio,M. Turunen,G. Umana,H. Ungerechts,F. Villa,Jingwen Wu,Andrea Zacchei,J. A. Zensus,Xu Zhou +94 more
TL;DR: In this paper, simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars belonging to three samples with flux limits in the soft X-ray, hard Xray, and gamma-ray bands were presented.
Journal ArticleDOI
The structure and emission model of the relativistic jet in the quasar 3C 279 inferred from radio to high-energy gamma-ray observations in 2008-2010
M. Hayashida,G. M. Madejski,Krzysztof Nalewajko,M. Sikora,Ann E. Wehrle,Patrick Ogle,Werner Collmar,S. Larsson,Yasushi Fukazawa,R. Itoh,James Chiang,Lukasz Stawarz,Roger Blandford,J. L. Richards,Walter Max-Moerbeck,A. C. S. Readhead,R. Buehler,E. Cavazzuti,S. Ciprini,N. Gehrels,A. Reimer,Anna Szostek,Takaaki Tanaka,G. Tosti,Yasunobu Uchiyama,Koji S. Kawabata,M. Kino,K. Sakimoto,Mahito Sasada,Susumu Sato,Makoto Uemura,Masayuki Yamanaka,Jochen Greiner,T. Kruehler,Andrea Rossi,Jean-Pierre Macquart,Douglas C.-J. Bock,M. Villata,C. M. Raiteri,I. Agudo,Hugh D. Aller,M. F. Aller,A. A. Arkharov,Uwe Bach,Erika Benítez,Andrei Berdyugin,Dmitry A. Blinov,K. Blumenthal,M. Boettcher,Carla Buemi,D. Carosati,Wen Ping Chen,A. Di Paola,Mauro Dolci,N. V. Efimova,E. Forné,José L. Gómez,Mark Gurwell,Jochen Heidt,David Hiriart,B. Jordan,Svetlana G. Jorstad,Manasvita Joshi,Givi N. Kimeridze,Tatiana S. Konstantinova,E. N. Kopatskaya,Ekaterina Koptelova,Omar M. Kurtanidze,Anne Lähteenmäki,A. Lamerato,Valeri M. Larionov,Elena G. Larionova,L. V. Larionova,Paolo Leto,E. Lindfors,Alan P. Marscher,I. M. McHardy,S. N. Molina,D. A. Morozova,M. G. Nikolashvili,K. Nilsson,R. Reinthal,P. Roustazadeh,T. Sakamoto,Lorand A. Sigua,A. Sillanpää,L. O. Takalo,Joni Tammi,Brian W. Taylor,Merja Tornikoski,Corrado Trigilio,I. S. Troitsky,G. Umana +92 more
TL;DR: In this paper, the authors present time-resolved broad-band observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during the first two years of the Fermi Gamma-ray Space Telescope mission.