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200 papers

The ANTARES telescope is well-suited to detect neutrinos produced in astrophysical transient sources as it can observe a full hemisphere of the sky at all times with a high duty cycle. Radio-loud active galactic nuclei with jets pointing…

High Energy Astrophysical Phenomena · Physics 2015-06-03 S. Adrián-Martínez , I. Al Samarai , A. Albert , M. André , M. Anghinolfi , G. Anton , S. Anvar , M. Ardid , T. Astraatmadja , J-J. Aubert , B. Baret , S. Basa , V. Bertin , S. Biagi , C. Bigongiari , C. Bogazzi , M. Bou-Cabo , B. Bouhou , M. C. Bouwhuis , J. Brunner , J. Busto , F. Camarena , A. Capone , C. Cârloganu , G. Carminati , J. Carr , S. Cecchini , Z. Charif , Ph. Charvis , T. Chiarusi , M. Circella , L. Core , H. Costantini , P. Coyle , A. Creusot , C. Curtil , G. De Bonis , M. P. Decowski , I. Dekeyser , A. Deschamps , C. Distefano , C. Donzaud , D. Dornic , Q. Dorosti , D. Drouhin , T. Eberl , U. Emanuele , A. Enzenhöfer , J-P. Ernenwein , S. Escoffier , K. Fehn , P. Fermani , M. Ferri , S. Ferry , V. Flaminio , F. Folger , U. Fritsch , J-L. Fuda , S. Galatà , P. Gay , K. Geyer , G. Giacomelli , V. Giordano , J. P. Gómez-González , K. Graf , G. Guillard , G. Halladjian , G. Hallewell , H. van Haren , J. Hartman , A. J. Heijboer , Y. Hello , J. J. Hernández-Rey , B. Herold , J. Hößl , C. C. Hsu , M. de Jong , M. Kadler , O. Kalekin , A. Kappes , U. Katz , O. Kavatsyuk , P. Kooijman , C. Kopper , A. Kouchner , I. Kreykenbohm , V. Kulikovskiy , R. Lahmann , G. Lambard , G. Larosa , D. Lattuada , D. Lefèvre , G. Lim , D. Lo Presti , H. Loehner , S. Loucatos , F. Louis , S. Mangano , M. Marcelin , A. Margiotta , J. A. Martínez-Mora , A. Meli , T. Montaruli , N. Morganti , L. Moscoso , H. Motz , M. Neff , E. Nezri , D. Palioselitis , G. E. Păvălaş , K. Payet , P. Payre , J. Petrovic , P. Piattelli , N. Picot-Clemente , V. Popa , T. Pradier , E. Presani , C. Racca , C. Reed , G. Riccobene , C. Richardt , R. Richter , C. Rivière , A. Robert , K. Roensch , A. Rostovtsev , J. Ruiz-Rivas , M. Rujoiu , G. V. Russo , F. Salesa , D. F. E. Samtleben , P. Sapienza , F. Schöck , J-P. Schuller , F. Schüssler , T. Seitz , R. Shanidze , F. Simeone , A. Spies , M. Spurio , J. M. Steijger , Th. Stolarczyk , A. Sánchez-Losa , M. Taiuti , C. Tamburini , S. Toscano , B. Vallage , C. Vallée , V. Van Elewyck , G. Vannoni , M. Vecchi , P. Vernin , E. Visser , S. Wagner , G. Wijnker , J. Wilms , E. de Wolf , H. Yepes , D. Zaborov , J. D. Zornoza , J. Zúñiga

In this paper, we discuss an artificial intelligence based approach to constrain the redshift of blazars using combined $\gamma$--ray observations from the \emph{Fermi} Large Area Telescope (LAT) and ground based atmospheric Cherenkov…

High Energy Astrophysical Phenomena · Physics 2019-11-26 K K Singh , V K Dhar , P J Meintjes

Machine learning is an automatic technique that is revolutionizing scientific research, with innovative applications and wide use in astrophysics. The aim of this study was to developed an optimized version of an Artificial Neural Network…

High Energy Astrophysical Phenomena · Physics 2020-06-26 Miloš Kovačević , Graziano Chiaro , Sara Cutini , Gino Tosti

The Gamma-ray Large Area Space Telescope (GLAST) is a next generation high energy gamma-ray observatory due for launch in Fall 2007. The primary instrument is the Large Area Telescope (LAT), which will measure gamma-ray flux and spectra…

Astrophysics · Physics 2009-09-29 R. Dubois

The Cherenkov Telescope Array (CTA), currently in its Preparatory Phase, will be the first open observatory for very high energy gamma-rays from galactic and extragalactic sources. The international consortium behind CTA is preparing the…

Instrumentation and Methods for Astrophysics · Physics 2019-08-14 A. Zech

Artificial intelligence technology has been widely used in astronomy, and new artificial intelligence technologies and application scenarios are constantly emerging. There have been a large number of papers reviewing the application of…

Instrumentation and Methods for Astrophysics · Physics 2024-01-17 Kang Huang , Tianzhu Hu , Jingyi Cai , Xiushan Pang , Yonghui Hou , Yong Zhang , Huaiqing Wang , Xiangqun Cui

The F-GAMMA-project is the coordinated effort of several observatories to understand the AGN phenomenon and specifically blazars via multi-frequency monitoring in collaboration with the {\sl Fermi}-GST satellite since January 2007. The core…

This review paper discusses the past and present observations of gamma-ray blazars with both space and ground-based gamma-ray telescopes (such as EGRET and current TeV telescopes), and with the VLBA. I also discuss the more sensitive…

Astrophysics · Physics 2007-05-23 B. Glenn Piner

Blazars, a beamed population of active galactic nuclei, radiate high-energy gamma-rays, and thus are a good target for the Gamma Ray Large Area Space Telescope (GLAST). As the blazars trace the large-scale structure of the universe, one may…

Astrophysics · Physics 2008-12-18 Shin'ichiro Ando , Eiichiro Komatsu , Takuro Narumoto , Tomonori Totani

The Large Area Telescope on the recently launched Fermi Gamma-ray Space Telescope (formerly GLAST), with its large field of view and effective area, combined with its excellent timing capabilities, is poised to revolutionize the field of…

Astrophysics of Galaxies · Physics 2019-08-14 P. M. Saz Parkinson

The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST), with its improved sensitivity relative to previous generation gamma-ray telescopes, is significantly increasing the number of known gamma-ray sources in…

Astrophysics of Galaxies · Physics 2019-08-13 P. M. Saz Parkinson , M. Dormody , M. Ziegler

The use of Artificial Neural Networks (ANNs) as a classifier of digital spectra is investigated. Using both simulated and real data, it is shown that neural networks can be trained to discriminate between the spectra of different classes of…

Astrophysics · Physics 2021-10-13 Daya M. Rawson , Jeremy Bailey , Paul J. Francis

The Fermi Gamma-ray Space Telescope with its main instrument on-board, the Large Area Telescope (LAT), opened a new era in the study of high-energy emission from Active Galactic Nuclei (AGN). When combined with contemporaneous ground- and…

High Energy Astrophysical Phenomena · Physics 2017-12-01 Filippo D'Ammando

Technology has advanced to the point that it is possible to image the entire sky every night and process the data in real time. The sky is hardly static: many interesting phenomena occur, including variable stationary objects such as stars…

Instrumentation and Methods for Astrophysics · Physics 2018-05-23 J. L. Tonry , L. Denneau , A. N. Heinze , B. Stalder , K. W. Smith , S. J. Smartt , C. W. Stubbs , H. J. Weiland , A. Rest

The Synchronous Network of distant Telescopes (SNT) represents an innovative approach in observational astrophysics. Authors present the unique existing realization of the SNT-conception. It was founded within the international…

There is an obvious need for automated classification of galaxies, as the number of observed galaxies increases very fast. We examine several approaches to this problem, utilising {\em Artificial Neural Networks} (ANNs). We quote results…

Astrophysics · Physics 2009-10-22 Avi Naim

The study of transient and variable events, including novae, active galactic nuclei, and black hole binaries, has historically been a fruitful path for elucidating the evolutionary mechanisms of our universe. The study of such events in the…

Gamma rays with energy above 10 GeV interact with optical-UV photons resulting in pair production. Therefore, a large sample of high redshift sources of these gamma rays can be used to probe the extragalactic background starlight (EBL) by…

Astrophysics · Physics 2009-11-10 Andrew Chen , Luis C. Reyes , Steven Ritz

A new generation of sub-orbital platforms will be operational in the next few years. These new telescopes will operate from airborne and balloon-borne platforms where the atmosphere is transparent enough to allow sensitive measurements to…

Astrophysics · Physics 2017-08-23 Mark J. Devlin

We describe a uniform all-sky survey of bright blazars, selected primarily by their flat radio spectra, that is designed to provide a large catalog of likely gamma-ray AGN. The defined sample has 1625 targets with radio and X-ray properties…