Results 31 to 40 of about 19,895 (210)

15 GHz Monitoring of Gamma-ray Blazars with the OVRO 40 Meter Telescope in Support of Fermi [PDF]

, 2009
We present results from the first two years of our fast-cadence 15 GHz gamma-ray blazar monitoring program, part of the F-GAMMA radio monitoring project.
Angelakis, E., Fuhrmann, L., Grainge, K., Healey, S. E., Max-Moerbeck, W., Pavlidou, V., Pearson, T. J., Readhead, A. C. S., Richards, J. L., Romani, R. W., Scargle, J. D., Shaw, M. S., Stevenson, M. A., Taylor, G. B., Zensus, J. A.   +14 more
core   +2 more sources

3HWC J0631+107/LHAASO J0631+1040: A TeV Halo Powered by the Pulsar J0631+1036?

The Astrophysical Journal, 2023
PSR J0631+1036 is a middle-aged pulsar with properties similar to those of the nearby Geminga pulsar. It is bright in γ -rays, and has been noted as the only source possibly associated with the TeV source 3HWC J0631+107 (also the LHAASO J0631+1040).
Dong Zheng, Zhongxiang Wang, Yi Xing
doaj   +1 more source

Fermi Large Area Telescope Bright Gamma-ray Source List

, 2009
Following its launch in June 2008, the Fermi Gamma-ray Space Telescope (Fermi) began a sky survey in August. The Large Area Telescope (LAT) on Fermi in 3 months produced a deeper and better-resolved map of the gamma-ray sky than any previous space ...
A. A. Abdo, A. A. Moiseev, A. Bouvier, A. Brez, A. Chekhtman, A. de Angelis, A. de Luca, A. K. Harding, A. Makeev, A. Morselli, A. P. Waite, A. Reimer, A. S. Johnson, A. Sander, A. Sellerholm, A. Sierpowska-Bartosik, A. Tramacere, A. Van Etten, A. W. Borgland, A. W. Strong, A. Y. Rodriguez, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Aharonian, Albert, Atwood, B. Berenji, B. Giebels, B. L. Winer, B. Lott, B. M. Baughman, C. C. Cheung, C. Cecchi, C. D. Dermer, C. Farnier, C. Favuzzi, C. Meurer, C. Monte, C. Sgrò, C. Shrader, Cheung, Ciprini, D. A. Smith, D. Bastieri, D. Dumora, D. F. Torres, D. Gasparrini, D. Horan, D. J. Suson, D. J. Thompson, D. Kocevski, D. L. Band, D. Paneque, D. Parent, D. S. Davis, D. Sanchez, Damiani, de Ruiter, E. Bonamente, E. C. Ferrara, E. Cavazzuti, E. Charles, E. D. Bloom, E. do Couto e Silva, E. Hays, E. J. Siskind, E. Moretti, E. Nuss, E. Orlando, E. Wallace, F. de Palma, F. Gargano, F. Giordano, F. Kuehn, F. Longo, F. Loparco, F. Piron, F. Ryde, Funk, G. A. Caliandro, G. Barbiellini, G. F. Bignami, G. Godfrey, G. Jóhannesson, G. M. Madejski, G. Spandre, G. Tosti, Green, Guibert, H. F.-W. Sadrozinski, H. Katagiri, H. Tajima, H. Takahashi, Hartman, Healey, Healey, Hunter, I. A. Grenier, I. V. Moskalenko, J. B. Thayer, J. Ballet, J. Bregeon, J. Chiang, J. Cohen-Tanugi, J. Conrad, J. D. Scargle, J. E. Grove, J. E. McEnery, J. F. Ormes, J. G. Thayer, J. H. Panetta, J. Kataoka, J. Knödlseder, J. Lande, J. M. Casandjian, J. P. Norris, J.-L. Starck, K. Bechtol, K. S. Wood, K. Watters, Kargaltsev, L. Baldini, L. Costamante, L. Guillemot, L. Latronico, L. Poupard, L. R. Cominsky, L. S. Rochester, L. Tibaldo, Liu, M. Ackermann, M. Ajello, M. Axelsson, M. Battelino, M. Brigida, M. Dormody, M. E. Monzani, M. Frailis, M. Hayashida, M. Kerr, M. Kuss, M. L. Kocian, M. Lemoine-Goumard, M. Marelli, M. N. Lovellette, M. N. Mazziotta, M. Ohno, M. Ozaki, M. Pepe, M. Pesce-Rollins, M. Razzano, M. Roth, M. S. Shaw, M. S. Strickman, M. Ziegler, M.-H. Grondin, Manchester, N. Gehrels, N. Giglietto, N. Kawai, N. Komin, N. Omodei, N. Rea, N. Vilchez, O. Reimer, O. Tibolla, P. A. Caraveo, P. Bruel, P. D. Smith, P. F. Michelson, P. Fusco, P. Giommi, P. L. Nolan, P. Lubrano, P. M. Saz Parkinson, P. S. Drell, P. S. Ray, P. Spinelli, P. Wang, Paredes, Pittori, Porter, Protassov, R. A. Cameron, R. Bellazzini, R. C. Hartman, R. Claus, R. Corbet, R. D. Blandford, R. Dubois, R. E. Hughes, R. P. Johnson, R. Rando, R. W. Romani, Roberts, S. Ciprini, S. Cutini, S. E. Healey, S. Funk, S. Germani, S. Guiriec, S. J. Fegan, S. McGlynn, S. Murgia, S. Rainò, S. Ritz, S. W. Digel, S.-H. Lee, Sowards-Emmerd, Strong, Sutherland, T. A. Porter, T. E. Stephens, T. Glanzman, T. H. Burnett, T. J. Johnson, T. Kamae, T. L. Schalk, T. L. Usher, T. Mizuno, T. Nakamori, T. Ohsugi, T. Reposeur, T. Takahashi, T. Tanaka, T. Ylinen, Tibolla, Tramacere, V. Pelassa, V. Vitale, W. B. Atwood, W. B. Focke, W. McConville, W. Mitthumsiri, W. N. Johnson, Y. Fukazawa, Y. Hanabata, Y. Uchiyama   +252 more
core   +1 more source

Progress in Multi-wavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges

Galaxies, 2019
This review provides an overview of recent advances in multi-wavelength and multi-messenger observations of blazars, the current status of theoretical models for blazar emission, and prospects for future facilities.
Markus Böttcher
doaj   +1 more source

BL Lacertae Objects and the Extragalactic Gamma-Ray Background

, 2011
A tight correlation between gamma-ray and radio emission is found for a sample of BL Lacertae (BL Lac) objects detected by Fermi Gamma-ray Space Telescope (Fermi) and the Energetic Gamma-Ray Experiment Telescope (EGRET).
Abdo, Abdo, Atwood, Bai, Cao, Chiang, Dermer, Dermer, Dodson, Dondi, Fan, Fan, Fan, Fan Li, Gear, Georganopoulos, Ghisellini, Giroletti, Gu, Hartman, Helmboldt, Horiuchi, Kataoka, Komossa, Kovalev, Liu, Mattox, Michelson, Narumoto, Padovani, Padovani, Sreekumar, Strong, Thompson, Wang, Xin-Wu Cao, Yuan, Zhang, Zhou, Zhou   +39 more
core   +1 more source

Dark Matter Signals in the gamma-ray sky

EPJ Web of Conferences, 2014
Detection of gamma rays and cosmic rays from the annihilation or decay of dark matter particles is a promising method for identifying dark matter, understanding its intrinsic properties, and mapping its distribution in the universe.
Morselli Aldo
doaj   +1 more source

Blazar jet physics in the age of Fermi

, 2010
The impact of the Fermi Gamma-ray Space Telescope on blazar research is reviewed. This includes a brief description of the Fermi Large Area Telescope, a summary of the various classes of extragalactic sources found in the First Large Area Telescope AGN ...
Dermer, Charles D.
core   +1 more source

Quasi‐Constant Time Gap in Multiple Rings of Elves

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract We present evidence that the time delay between the multiple rings of elves is not caused by the ground reflection of the electromagnetic pulse produced by intracloud lightning. To investigate temporal differences of multi‐elves, we analyzed data from four storms occurring at various times and distances from the Pierre Auger Observatory in ...
The Pierre Auger Collaboration
wiley   +1 more source

Upper limit on the axion-photon coupling from Markarian 421

Physics Letters B
Markarian421 is a well-known nearby BL Lac blazar at the redshift z=0.031. Many previous works were investigated to constrain the axion-photon coupling from its TeV gamma-ray observations, showing the upper limit on the coupling constant gaγ≲2.0×10−11GeV−
Hai-Jun Li, Wei Chao, Yu-Feng Zhou
doaj   +1 more source

Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies

Galaxies, 2019
Before the launch of the Fermi Gamma-ray Space Telescope satellite only two classes of active galactic nuclei (AGN) were known to generate relativistic jets and thus to emit up to the γ -ray energy range: blazars and radio galaxies, both hosted
Filippo D’Ammando
doaj   +1 more source