Results 21 to 30 of about 25,883 (316)

CATACLYSMIC VARIABLES AND GAMMA-RAY SOURCES [PDF]

EAS Publications Series, 2013
The cataclysmic variables are associated with high energy events and probably many of them could be potential gamma-ray sources. Up to now Fermi-LAT detected 3 gamma-ray transients, which belong to CVs and related objects: V407 Cyg, N Sco 2012 and N Mon 2012 = V959 Mon. We present the first multicolour observations of the slow classical nova V959 Mon.
Sergey Yu. Shugarov, Sergey Yu. Shugarov, Drahomir Chochol, E. P. Pavlenko, Viktor Malanushenko   +4 more
openaire   +2 more sources

Second AGILE catalogue of gamma-ray sources [PDF]

Astronomy & Astrophysics, 2019
Aims. We present the second AGILE–GRID catalogue (2AGL) ofγ-ray sources in the energy range 100 MeV–10 GeV.Methods. With respect to previous AGILE–GRID catalogues, the current 2AGL catalogue is based on the first 2.3 years of science data from the AGILE mission (the so-called pointing mode) and incorporates more data and several analysis improvements ...
A. Pellizzoni, L. Baroncelli, Francesco Longo, A. Giuliani, Alessio Aboudan, Fulvio Gianotti, Maura Pilia, A. Rappoldi, M. Trifoglio, M. Tavani, Fabrizio Lucarelli, Fabrizio Lucarelli, G. Piano, N. Parmiggiani, A. Argan, M. Giusti, S. Vercellone, A. W. Chen, C. Pittori, C. Pittori, Louis Antonelli, Andrea Bulgarelli, Paolo Giommi, P. W. Cattaneo, M. Cardillo, I. Donnarumma, I. Donnarumma, Alessio Trois, F. Verrecchia, F. Verrecchia, Valentina Fioretti, Andrea Zoli   +31 more
openaire   +5 more sources

International workshop on next generation gamma-ray source [PDF]

Journal of Physics G: Nuclear and Particle Physics, 2021
Abstract A workshop on The Next Generation Gamma-Ray Source sponsored by the Office of Nuclear Physics at the Department of Energy, was held November 17-19, 2016 in Bethesda, Maryland. The goals of the workshop were to identify basic and applied research opportunities at the frontiers of nuclear physics that would be made possible by the
Howell, C. R., Ahmed, M. W., Afanasev, A., Alesini, D., Annand, J. R. M., Aprahamian, A., Balabanski, D. L., Benson, S. V., Bernstein, A., Brune, C. R., Byrd, J., Carlsten, B. E., Champagne, A. E., Chattopadhyay, S., Davis, D., Downie, E. J., Durham, J. M., Feldman, G., Gao, H., Geddes, C. G. R., Grie��hammer, H. W., Hajima, R., Hao, H., Hornidge, D., Isaak, J., Janssens, R. V. F., Kendellen, D. P., Kovash, M. A., Martel, P. P., Mei��ner, U-G, Miskimen, R., Pasquini, B., Phillips, D. R., Pietralla, N., Savran, D., Schindler, M. R., Sikora, M. H., Snow, W. M., Springer, R. P., Sun, C., Tang, C., Tiburzi, B., Tonchev, A. P., Tornow, W., Ur, C. A., Wang, D., Weller, H. R., Werner, V., Wu, Y. K., Yan, J., Zhao, Z., Zilges, A., Zomer, F.   +52 more
openaire   +8 more sources

Near-infrared and gamma-ray monitoring of TANAMI gamma-ray bright sources [PDF]

Astronomy & Astrophysics, 2013
Spectral energy distribution and its variability are basic tools for understanding the physical processes operating in active galactic nuclei (AGN). In this paper we report the results of a one-year near infra red (NIR) and optical monitoring of a sample of 22 AGN known to be gamma-ray emitters, aimed at discovering correlations between optical and ...
Roberto Nesci, Roberto Nesci, Gino Tosti, Tapio Pursimo, Roopesh Ojha, Roopesh Ojha, Matthias Kadler   +6 more
openaire   +5 more sources

A Search for Blazar-Like Radio-Loud Narrow-Line Seyfert 1 Galaxies

Galaxies, 2017
We report the results of an observational program to investigate the gamma-ray and optical variability properties of the vRL NLSY1 galaxies listed in the Yuan et al. sample. We have identified 17 members of the Yuan et al. sample possibly associated with
Hugh R. Miller, Jeremy D. Maune, Joseph R. Eggen, Clay S. Turner, Elizabeth C. Ferrara, Diana O. Gudkova, Amy M. Battles   +6 more
doaj   +1 more source

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

Do gamma-ray burst sources repeat? [PDF]

Monthly Notices of the Royal Astronomical Society, 1993
Following the discovery by Quashnock and Lamb (1993) of an apparent excess of $ $-ray burst pairs with small angular separations, we reanalyze the angular distribution of the bursts in the BATSE catalogue. We find that in addition to an excess of close pairs, there is also a comparable excess of antipodal bursts, i.e pairs of bursts separated by about
Ramesh Narayan, Tsvi Piran
openaire   +5 more sources

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

Precessing microblazars and unidentified gamma-ray sources [PDF]

Astronomy & Astrophysics, 2002
The recent discovery by Paredes et al. (2000) of a persistent microquasar that is positionally coincident with an unidentified gamma-ray source has open the possibility that other sources in the Third EGRET Catalog could be interpreted as microquasars as well.
Kaufman Bernadó, María Marina, Romero, Gustavo Esteban, Mirabel Miquele, Igor Felix   +2 more
openaire   +5 more sources

Extragalactic sources of TeV gamma rays: a summary [PDF]

New Astronomy Reviews, 2004
The development of techniques whereby gamma rays of energy 100 GeV and above can be studied from the ground, using indirect, but sensitive, techniques has opened up a new area of high energy photon astronomy. The most exciting result that has come from these is the detection of highly variable fluxes of TeV gamma rays from the relativistic jets in ...
T. C. Weekes, D. Horan
openaire   +3 more sources