V
V. D'Elia
Researcher at INAF
Publications - 269
Citations - 10403
V. D'Elia is an academic researcher from INAF. The author has contributed to research in topics: Gamma-ray burst & Redshift. The author has an hindex of 50, co-authored 269 publications receiving 9206 citations. Previous affiliations of V. D'Elia include ASTRON.
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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
Relativistic jet activity from the tidal disruption of a star by a massive black hole
David N. Burrows,J. A. Kennea,Gabriele Ghisellini,Vanessa Mangano,Bing Zhang,K. L. Page,Mike Eracleous,P. Romano,T. Sakamoto,T. Sakamoto,A. D. Falcone,J. P. Osborne,Sergio Campana,A. P. Beardmore,A. A. Breeveld,M. M. Chester,R. H. D. Corbet,R. H. D. Corbet,Stefano Covino,J. R. Cummings,J. R. Cummings,P. D'Avanzo,V. D'Elia,Paolo Esposito,Phil Evans,D. Fugazza,Jonathan Gelbord,Kazuo Hiroi,Stephen T. Holland,Stephen T. Holland,K. Y. Huang,Myungshin Im,G. L. Israel,Yoon-Seong Jeon,Y.-B. Jeon,Hyunsung David Jun,Nobuyuki Kawai,Ji Hoon Kim,Hans A. Krimm,Hans A. Krimm,F. E. Marshall,Peter Mészáros,Hitoshi Negoro,Nicola Omodei,Nicola Omodei,Wonsun Park,J. S. Perkins,J. S. Perkins,M. Sugizaki,H.-I. Sung,Gianpiero Tagliaferri,Eleonora Troja,Yoshihiro Ueda,Yuji Urata,Ryuichi Usui,L. A. Antonelli,Scott Barthelmy,Giancarlo Cusumano,P. Giommi,A. Melandri,M. Perri,Judith Racusin,B. Sbarufatti,M. H. Siegel,Neil Gehrels +64 more
TL;DR: Observations of a bright X-ray flare from the extragalactic transient Swift J164449.3+573451 conclude that they have captured the onset of relativistic jet activity from a supermassive black hole.
Journal ArticleDOI
GRB 090423 at a redshift of z ≈ 8.1
Ruben Salvaterra,M. Della Valle,Sergio Campana,G. Chincarini,G. Chincarini,Stefano Covino,P. D'Avanzo,P. D'Avanzo,Alberto Fernández-Soto,C. Guidorzi,Filippo Mannucci,Raffaella Margutti,Raffaella Margutti,Christina C. Thöne,L. A. Antonelli,Scott Barthelmy,M. de Pasquale,V. D'Elia,Fabrizio Fiore,Dino Fugazza,L. K. Hunt,Elisabetta Maiorano,S. Marinoni,F. E. Marshall,Emilio Molinari,J. A. Nousek,Elena Pian,Judith Racusin,Luigi Stella,Lorenzo Amati,Gloria Andreuzzi,Giancarlo Cusumano,E. E. Fenimore,P. Ferrero,P. Giommi,Dafne Guetta,Stephen T. Holland,Stephen T. Holland,Kevin Hurley,G. L. Israel,J. Mao,C. B. Markwardt,C. B. Markwardt,N. Masetti,C. Pagani,Eliana Palazzi,D. M. Palmer,Silvia Piranomonte,Gianpiero Tagliaferri,Vincenzo Testa +49 more
TL;DR: Tanvir et al. as mentioned in this paper used the United Kingdom Infrared Telescope, Hawaii, from about 20 minutes after the burst and arrive at z ≈ 8.2, implying that massive stars were being produced and dying as GRBs approximately 620 million years after the Big Bang.
Journal ArticleDOI
Discovery of the Onset of Rapid Accretion by a Dormant Massive Black Hole
D. N. Burrows,F. E. Marshall,Stephen T. Holland,Mike Eracleous,Hitoshi Negoro,T. Sakamoto,V. Mangano,M. M. Chester,H.-I. Sung,Bing Zhang,K. Y. Huang,Peter Mészáros,A. A. Breeveld,D. Fugazza,P. Giommi,Sergio Campana,E. Troja,B. Sbarufatti,G. Cusumano,Yoshihiro Ueda,R. H. D. Corbet,A. P. Beardmore,J. P. Osborne,Stefano Covino,A. D. Falcone,N. Kawai,M. Sugizaki,Y.-B. Jeon,M. Perri,Kazuo Hiroi,A. Melandri,S. D. Barthelmy,G. Tagliaferri,V. D'Elia,Paolo Esposito,G. L. Israel,J. S. Perkins,Jonathan Gelbord,Myungshin Im,P. Romano,L. A. Antonelli,J. R. Cummings,J. L. Racusin,P. A. Evans,M. H. Siegel,Ryuichi Usui,H. A. Krimm,J. A. Kennea,Wonsun Park,K. L. Page,Yuji Urata,Y. B. Jeon,Nicola Omodei,P. D'Avanzo,Gabriele Ghisellini,N. Gehrels +55 more
TL;DR: In this paper, the authors reported the first discovery of the onset of a relativistic accretion-powered jet in the new extragalactic transient, Swift J164449.3+573451.
Journal ArticleDOI
X-Shooter spectroscopy of young stellar objects: IV -- Accretion in low-mass stars and sub-stellar objects in Lupus
J. M. Alcalá,A. Natta,Carlo F. Manara,L. Spezzi,Beate Stelzer,Antonio Frasca,K. Biazzo,E. Covino,Sofia Randich,E. Rigliaco,Leonardo Testi,F. Comerón,Guido Cupani,V. D'Elia +13 more
TL;DR: In this paper, the authors present X-Shooter/VLT observations of a sample of 36 low-mass stellar and sub-stellar objects in the Lupus star forming region, spanning a range in mass from ~0.03 to ~1.2Msun, but mostly with 0.1Msun < Mstar < 0.5Msun.