R
Roger Blandford
Researcher at Stanford University
Publications - 716
Citations - 97353
Roger Blandford is an academic researcher from Stanford University. The author has contributed to research in topics: Galaxy & Fermi Gamma-ray Space Telescope. The author has an hindex of 156, co-authored 704 publications receiving 90181 citations. Previous affiliations of Roger Blandford include SLAC National Accelerator Laboratory & Max Planck Society.
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Journal ArticleDOI
Alignment of Magnetized Accretion Disks and Relativistic Jets with Spinning Black Holes
TL;DR: The authors' simulations reveal a “magneto-spin alignment” mechanism that causes magnetized disks and jets to align with the BH spin near BHs and to reorient with the outer disk farther away, which has implications for the evolution of BH mass and spin, BH feedback on host galaxies, and resolved BH images.
Journal ArticleDOI
Multiwavelength Evidence for Quasi-periodic Modulation in the Gamma-Ray Blazar PG 1553+113
Markus Ackermann,Marco Ajello,Andrea Albert,W. B. Atwood,Luca Baldini,Luca Baldini,Jean Ballet,Guido Barbiellini,Guido Barbiellini,Denis Bastieri,Denis Bastieri,J. Becerra González,J. Becerra González,Ronaldo Bellazzini,Elisabetta Bissaldi,Roger Blandford,Elliott D. Bloom,R. Bonino,R. Bonino,Eugenio Bottacini,Johan Bregeon,P. Bruel,R. Buehler,S. Buson,S. Buson,G. A. Caliandro,R. A. Cameron,R. Caputo,M. Caragiulo,P. A. Caraveo,E. Cavazzuti,Claudia Cecchi,Claudia Cecchi,A. Chekhtman,James Chiang,G. Chiaro,Stefano Ciprini,Stefano Ciprini,Stefano Ciprini,Johann Cohen-Tanugi,Jan Conrad,Jan Conrad,S. Cutini,S. Cutini,S. Cutini,Filippo D'Ammando,Filippo D'Ammando,A. De Angelis,F. de Palma,R. Desiante,R. Desiante,L. Di Venere,A. Domi´nguez,Persis S. Drell,C. Favuzzi,C. Favuzzi,S. J. Fegan,Elizabeth C. Ferrara,W. B. Focke,Lars Fuhrmann,Yasushi Fukazawa,P. Fusco,P. Fusco,F. Gargano,Dario Gasparrini,Dario Gasparrini,Dario Gasparrini,Nicola Giglietto,Nicola Giglietto,Paolo Giommi,Francesco Giordano,Francesco Giordano,Marcello Giroletti,G. Godfrey,David H. Green,David H. Green,I. A. Grenier,J. E. Grove,Sylvain Guiriec,Alice K. Harding,E. Hays,John W. Hewitt,A. B. Hill,A. B. Hill,D. Horan,T. Jogler,Gudlaugur Johannesson,A. S. Johnson,T. Kamae,M. Kuss,Stefan Larsson,Stefan Larsson,Luca Latronico,J. Li,Liang Li,Liang Li,Francesco Longo,Francesco Longo,F. Loparco,F. Loparco,Benoit Lott,M. N. Lovellette,P. Lubrano,P. Lubrano,J. D. Magill,S. Maldera,Alberto Manfreda,Walter Max-Moerbeck,Walter Max-Moerbeck,M. Mayer,M. N. Mazziotta,Julie McEnery,Julie McEnery,Peter F. Michelson,Tsunefumi Mizuno,M. E. Monzani,A. Morselli,Igor V. Moskalenko,S. Murgia,E. Nuss,Masanori Ohno,T. Ohsugi,Roopesh Ojha,Nicola Omodei,E. Orlando,J. F. Ormes,David Paneque,David Paneque,T. J. Pearson,J. S. Perkins,M. Perri,M. Perri,Melissa Pesce-Rollins,Melissa Pesce-Rollins,Vahé Petrosian,F. Piron,G. Pivato,T. A. Porter,S. Rainò,S. Rainò,Riccardo Rando,Riccardo Rando,M. Razzano,Anthony C. S. Readhead,A. Reimer,Olaf Reimer,André Schulz,Carmelo Sgrò,E. J. Siskind,F. Spada,Gloria Spandre,P. Spinelli,P. Spinelli,D. J. Suson,Hiromitsu Takahashi,J. B. Thayer,D. J. Thompson,L. Tibaldo,Diego F. Torres,Diego F. Torres,G. Tosti,G. Tosti,Eleonora Troja,Eleonora Troja,Yasunobu Uchiyama,Giacomo Vianello,K. S. Wood,Matthew Wood,Stephan Zimmer,Andrei Berdyugin,R. H. D. Corbet,R. H. D. Corbet,Talvikki Hovatta,Elina Lindfors,Kari Nilsson,R. Reinthal,A. Sillanpää,Antonio Stamerra,L. O. Takalo,Mauri Valtonen +179 more
TL;DR: Using the Fermi Large Area Telescope (LAT), a quasi-periodicity in the γ-ray flux (E > 100 MeV) from the GeV/TeV BL Lac object PG 1553+113 was discovered in this paper.
Journal ArticleDOI
Gamma-ray Activity in the Crab Nebula: The Exceptional Flare of April 2011
R. Buehler,Jeffrey D. Scargle,Roger Blandford,Luca Baldini,Matthew G. Baring,Andrea Belfiore,E. Charles,J. Chiang,F. D'Ammando,Charles D. Dermer,Stefan Funk,J. E. Grove,Alice K. Harding,E. Hays,Matthew Kerr,Francesco Massaro,Mn Mazziotta,Roger W. Romani,P. M. Saz Parkinson,Allyn F. Tennant,Martin C. Weisskopf +20 more
TL;DR: A gamma-ray flare in the Crab nebula lasting for approximately nine days in April of 2011 was observed by the Large Area Telescope on board the Fermi satellite as discussed by the authors, where the peak photon flux was (186 +-6) 10-7 cm-2 s-1 above 100 MeV.
Journal ArticleDOI
Fermi Establishes Classical Novae as a Distinct Class of Gamma-ray Sources
Markus Ackermann,Marco Ajello,Andrea Albert,Luca Baldini,Jean Ballet,Denis Bastieri,Ronaldo Bellazzini,Elisabetta Bissaldi,Roger Blandford,Elliott D. Bloom,Eugenio Bottacini,T. J. Brandt,Johan Bregeon,Pascal Bruel,R. Buehler,S. Buson,G. A. Caliandro,R. A. Cameron,M. Caragiulo,P. A. Caraveo,Elizabeth C. Ferrara,Alice K. Harding,E. Hays,J. S. Perkins,D. J. Thompson +24 more
TL;DR: In 2012 and 2013, three novae were detected in γ rays and stood in contrast to the first γ-ray-detected nova V407 Cygni 2010, which belongs to a rare class of symbiotic binary systems.
Journal ArticleDOI
A Decade of Gamma-Ray Bursts Observed by Fermi-LAT: The Second GRB Catalog
Marco Ajello,Makoto Arimoto,Magnus Axelsson,Magnus Axelsson,Luca Baldini,Guido Barbiellini,Guido Barbiellini,Denis Bastieri,Denis Bastieri,Ronaldo Bellazzini,P. N. Bhat,Elisabetta Bissaldi,Elisabetta Bissaldi,Roger Blandford,R. Bonino,R. Bonino,J. Bonnell,J. Bonnell,Eugenio Bottacini,Eugenio Bottacini,Johan Bregeon,P. Bruel,R. Buehler,R. A. Cameron,Regina Caputo,P. A. Caraveo,E. Cavazzuti,Sina Chen,Sina Chen,C. C. Cheung,G. Chiaro,Stefano Ciprini,Stefano Ciprini,D. Costantin,M. Crnogorcevic,S. Cutini,Maria Giovanna Dainotti,Filippo D'Ammando,Filippo D'Ammando,P. de la Torre Luque,F. de Palma,Abhishek Desai,R. Desiante,N. Di Lalla,L. Di Venere,L. Di Venere,F. Fana Dirirsa,S. J. Fegan,Anna Franckowiak,Yasushi Fukazawa,Stefan Funk,P. Fusco,P. Fusco,F. Gargano,Dario Gasparrini,Dario Gasparrini,Nicola Giglietto,Nicola Giglietto,Francesco Giordano,Francesco Giordano,Marcello Giroletti,David A. Green,I. A. Grenier,J. E. Grove,Sylvain Guiriec,Sylvain Guiriec,E. Hays,J. W. Hewitt,D. Horan,Gudlaugur Johannesson,Gudlaugur Johannesson,Daniel Kocevski,M. Kuss,Luca Latronico,J. Li,Francesco Longo,Francesco Longo,F. Loparco,F. Loparco,M. N. Lovellette,P. Lubrano,S. Maldera,Alberto Manfreda,G. Martí-Devesa,Mn Mazziotta,I. Mereu,Manuel Meyer,Peter F. Michelson,Nestor Mirabal,Nestor Mirabal,Warit Mitthumsiri,Tsunefumi Mizuno,M. E. Monzani,E. Moretti,A. Morselli,Igor V. Moskalenko,Matteo Negro,Matteo Negro,Eric Nuss,Masanori Ohno,Nicola Omodei,M. Orienti,E. Orlando,M. Palatiello,M. Palatiello,Vaidehi S. Paliya,David Paneque,Massimo Persic,Melissa Pesce-Rollins,Vahé Petrosian,F. Piron,S. Poolakkil,H. Poon,T. A. Porter,Giacomo Principe,J. L. Racusin,S. Rainò,S. Rainò,Riccardo Rando,Riccardo Rando,M. Razzano,Soebur Razzaque,A. Reimer,Olaf Reimer,T. Reposeur,Felix Ryde,Felix Ryde,D. Serini,Carmelo Sgrò,E. J. Siskind,Eda Sonbas,Gloria Spandre,P. Spinelli,P. Spinelli,D. J. Suson,Hiroyasu Tajima,Hiroyasu Tajima,M. Takahashi,D. Tak,D. Tak,J. B. Thayer,Diego F. Torres,Eleonora Troja,Eleonora Troja,J. Valverde,Péter Veres,Giacomo Vianello,A. von Kienlin,K. S. Wood,M. Yassine,M. Yassine,Sylvia J. Zhu,Stephan Zimmer +152 more
TL;DR: In this article, the authors presented the second catalog of LAT-detected GRBs, covering the first 10 yr of operations, from 2008 to 2018 August 4, and found a total of 186 GRBs are found; of these, 91 showed emission in the range 30-100 MeV (17 of which were seen only in this band) and 169 are detected above 100 MeV.