Results 51 to 60 of about 712,854 (335)

The core dominance parameter and \emph{Fermi} detection of extragalactic radio sources

, 2016
In this paper, by cross-correlating an archive sample of 542 extragalactic radio sources with the \emph{Fermi}-LAT Third Source Catalog(3FGL), we have compiled a sample of 80 $\gamma$-ray sources and 462 non-\emph{Fermi} sources with available core ...
Gu, Minfeng, Liu, Zhenkuo, Wu, Zhongzu
core   +1 more source

UNVEILING THE NATURE OF THE UNIDENTIFIED GAMMA-RAY SOURCES. IV. THE SWIFT CATALOG OF POTENTIAL X-RAY COUNTERPARTS [PDF]

, 2013
A significant fraction (∼30%) of the high-energy γ-ray sources listed in the second Fermi Large Area Telescope (LAT) catalog are still of unknown origin, having not yet been associated with counterparts at lower energies.
A. Paggi, F. Massaro, R. D’abrusco, H. Smith, N. Masetti, M. Giroletti, G. Tosti, S. Funk   +7 more
semanticscholar   +1 more source

The Upcoming GAMMA-400 Experiment

Universe, 2023
The upcoming GAMMA-400 experiment will be implemented aboard the Russian astrophysical space observatory, which will be operating in a highly elliptical orbit over a period of 7 years to provide new data on gamma-ray emissions and cosmic-ray electron ...
Sergey I. Suchkov, Irina V. Arkhangelskaja, Andrey I. Arkhangelskiy, Aleksey V. Bakaldin, Irina V. Chernysheva, Arkady M. Galper, Oleg D. Dalkarov, Andrey E. Egorov, Maxim D. Kheymits, Mikhail G. Korotkov, Aleksey A. Leonov, Svetlana A. Leonova, Alexandr G. Malinin, Vladimir V. Mikhailov, Pavel Yu Minaev, Nikolay Yu. Pappe, Mikhail V. Razumeyko, Nikolay P. Topchiev, Yuri T. Yurkin   +18 more
doaj   +1 more source

Observation of Galactic Gamma-ray Sources with VERITAS

, 2008
We report on VERITAS observations at energies above 200 GeV of known or potential galactic gamma-ray sources. The observed objects comprise pulsars, pulsar wind nebulae, high-mass X-ray binaries and gamma-ray sources with unknown counterparts in other ...
Felix A. Aharonian, Frank Rieger, G. Maier, null null, Werner Hofmann   +4 more
core   +1 more source

A stacking method to study the gamma-ray emission of source samples based on the co-adding of Fermi LAT count maps [PDF]

, 2012
We present a stacking method that makes use of co-added maps of gamma-ray counts produced from data taken with the Fermi Large Area Telescope. Sources with low integrated gamma-ray fluxes that are not detected individually may become detectable when ...
Farnier, C., Huber, B., Manalaysay, A., Straumann, U., Walter, R.   +4 more
core   +1 more source

Exploring the bulk of the BL Lac object population:1. parsec-scale radio structures

, 2013
Context. The advent of Fermi is changing our understanding on the radio and gamma-ray emission in Active Galactic Nuclei. Contrary to pre-Fermi ideas, BL Lac objects are found to be the most abundant emitters in the gamma-ray band.
Boccardi, B., Casadio, C., Giovannini, G., Giroletti, M., Kadler, M., Liuzzo, E., Mignano, A., Tamburri, S., Taylor, G. B., Tosti, G.   +9 more
core   +1 more source

UNVEILING THE NATURE OF UNIDENTIFIED GAMMA-RAY SOURCES. I. A NEW METHOD FOR THE ASSOCIATION OF GAMMA-RAY BLAZARS [PDF]

, 2013
We present a new method for identifying blazar candidates by examining the locus, i.e., the region occupied by the Fermi γ-ray blazars in the three-dimensional color space defined by the WISE infrared colors.
R. D’abrusco, F. Massaro, A. Paggi, N. Masetti, G. Tosti, M. Giroletti, H. Smith   +6 more
semanticscholar   +1 more source

New stage in high-energy gamma-ray studies with GAMMA-400 after Fermi-LAT

EPJ Web of Conferences, 2017
Fermi-LAT has made a significant contribution to the study of high-energy gamma-ray diffuse emission and the observations of 3000 discrete sources. However, one third of all gamma-ray sources (both galactic and extragalactic) are unidentified, the data ...
Topchiev N.P., Galper A.M., Bonvicini V., Adriani O., Arkhangelskaja I.V., Arkhangelskiy A.I., Bakaldin A.V., Bobkov S.G., Boezio M., Dalkarov O.D., Egorov A.E., Gorbunov M.S., Gusakov Yu.V., Hnatyk B.I., Kadilin V.V., Kaplin V.A., Kheymits M.D., Korepanov V.E., Leonov A.A., Longo F., Mikhailov V.V., Mocchiutti E., Moiseev A.A., Moskalenko I.V., Naumov P.Yu., Picozza P., Runtso M.F., Serdin O.V., Sparvoli R., Spillantini P., Stozhkov Yu.I., Suchkov S.I., Taraskin A.A., Tavani M., Yurkin Yu.T., Zverev V.G.   +35 more
doaj   +2 more sources

The Jet Opening Angle and Event Rate Distributions of Short Gamma-Ray Bursts from Late-time X-Ray Afterglows

The Astrophysical Journal, 2023
We present a comprehensive study of 29 short gamma-ray bursts (SGRBs) observed ≈0.8−60 days postburst using Chandra and XMM-Newton. We provide the inferred distributions of the SGRB jet opening angles and true event rates to compare against neutron star ...
A. Rouco Escorial, W. Fong, E. Berger, T. Laskar, R. Margutti, G. Schroeder, J. C. Rastinejad, D. Cornish, S. Popp, M. Lally, A. E. Nugent, K. Paterson, B. D. Metzger, R. Chornock, K. Alexander, Y. Cendes, T. Eftekhari   +16 more
doaj   +1 more source

GLAST: Understanding the High Energy Gamma-Ray Sky

, 2004
We discuss the ability of the GLAST Large Area Telescope (LAT) to identify, resolve, and study the high energy gamma-ray sky. Compared to previous instruments the telescope will have greatly improved sensitivity and ability to localize gamma-ray point ...
A Konopelko, A Morselli, A Mücke, AE Wehrle, AK Harding, AM Atoyan, AM Atoyan, AW Strong, AW Strong, AW Strong, B Zhang, BL Dingus, C Montigny von, C Sarazin, CD Dermer, CM Urry, D Donato, DF Torres, DJ Thompson, DJ Thompson, DN Page, E Pfeffermann, EG Berezhko, Esposito, F Aharonian, F Aharonian, F Aharonian, FA Aharonian, FA Aharonian, FA Aharonian, Fossati, FW Stecker, FW Stecker, G Ghisellini, G Ghisellini, G Giovannini, GE Allen, GL Case, GV Bicknell, H Muraishi, IV Moskalenko, IV Moskalenko, J Chiang, J Quinn, J Silk, JH Buckley, JK Daugherty, K Hurley, K Katarzyñski, K Koyama, L Zhang, M Mori, M Pohl, M Punch, M Sikora, MA McLaughlin, MM Gonzalez, MS Jackson, N Gehrels, O Reimer, P Gralewicz, P Padovani, P Sreekumar, P Sreekumar, P Sreekumar, P Ullio, R Enomoto, R Fusco-Femiano, R Morganti, R Mukherjee, R Srinivasan, RC Hartman, RJ Maddalena, RP Pilla, S Colafrancesco, S Rudaz, SD Hunter, SE Boggs, SJ Sturner, SW Digel, SW Digel, T Kifune, T Tanimori, T Yoshikoshi, TA Ensslin, TA Porter, TK Gaisser, Y Rephaeli, YM Butt, YM Butt   +89 more
core   +1 more source