Results 81 to 90 of about 19,422 (206)

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

First Time‐Resolved Leader Spectra Associated With a Downward Terrestrial Gamma‐Ray Flash Detected at the Telescope Array Surface Detector

Journal of Geophysical Research: Atmospheres, Volume 129, Issue 24, 28 December 2024.
Abstract Optical emissions associated with Terrestrial Gamma ray Flashes (TGFs) have recently become important subjects in space‐based and ground‐based observations as they can help us understand how TGFs are produced during thunderstorms. In this paper, we present the first time‐resolved leader spectra of the optical component associated with a ...
N. Kieu, R. U. Abbasi, M. M. F. Saba, J. W. Belz, P. R. Krehbiel, M. A. Stanley, F. J. Gordillo‐Vazquez, M. Passas‐Varo, T. Warner, W. Rison, D. Rodeheffer, D. R. da Silva, D. Mazzucco, T. Knight, I. T. Cruz, J. Remington, J. Mazich, R. LeVon, K. Smout, A. Petrizze, T. Abu‐Zayyad, M. Allen, D. R. Bergman, I. Buckland, W. Campbell, B. G. Cheon, K. Endo, A. Fedynitch, T. Fujii, K. Fujisue, K. Fujita, M. Fukushima, G. Furlich, Z. Gerber, N. Globus, W. Hanlon, N. Hayashida, H. He, K. Hibino, R. Higuchi, D. Ikeda, T. Ishii, D. Ivanov, S. Jeong, C. C. H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, Y. Kawachi, K. Kawata, I. Kharuk, E. Kido, H. B. Kim, JiHee Kim, JiHyun Kim, S. W. Kim, R. Kobo, I. Komae, K. Komatsu, K. Komori, C. Koyama, M. Kudenko, M. Kuroiwa, Y. Kusumori, M. Kuznetsov, Y. J. Kwon, K. H. Lee, M. J. Lee, B. Lubsandorzhiev, J. P. Lundquist, A. Matsuzawa, J. A. Mathews, J. N. Matthews, K. Mizuno, M. Mori, M. Murakami, S. Nagataki, M. Nakahara, T. Nakamura, T. Nakayama, Y. Nakayama, T. Nonaka, S. Ogio, H. Ohoka, N. Okazaki, M. Onishi, A. Oshima, H. Oshima, S. Ozawa, I. H. Park, K. Y. Park, M. Potts, M. Przybylak, M. S. Pshirkov, C. Rott, G. I. Rubtsov, D. Ryu, H. Sagawa, N. Sakaki, R. Sakamoto, T. Sako, N. Sakurai, S. Sakurai, D. Sato, S. Sato, K. Sekino, T. Shibata, J. Shikita, H. Shimodaira, B. K. Shin, H. S. Shin, K. Shinozaki, J. D. Smith, P. Sokolsky, B. T. Stokes, T. A. Stroman, Y. Takagi, K. Takahashi, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, K. Tanaka, M. Tanaka, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, T. Tomida, S. Troitsky, Y. Tsunesada, S. Udo, F. Urban, I. A. Vaiman, M. Vrábel, D. Warren, K. Yamazaki, Y. Zhezher, Z. Zundel, J. Zvirzdin   +141 more
wiley   +1 more source

The Fermi GBM and LAT follow-up of GW150914

EPJ Web of Conferences, 2017
As the first detection of Gravitation Wave (GW) event arising from the coalescence of two stellar-mass Black Holes (BH) was announced by LIGO, a new era for astronomy began.
Bissaldi E., Connaughton V., Omodei N., Burns E., Goldstein A., Vianello G.   +5 more
doaj   +1 more source

Solving the Puzzle of the Carbonic Acid Vibrational Spectrum – an Anharmonic Story

ChemPhysChem, Volume 25, Issue 22, November 18, 2024.
The harmonic picture is the basic approximation that allows the prediction of vibrational spectra. However, reality is neither decoupled nor harmonic. This can lead to problems in notation and the assignment of individual bands. Taking anharmonicity and mode coupling into account allows a drastic improvement in spectral clarity.
Jonas Schlagin, Dennis F. Dinu, Jürgen Bernard, Thomas Loerting, Hinrich Grothe, Klaus R. Liedl   +5 more
wiley   +1 more source

Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes [PDF]

, 2009
The diffuse Galactic gamma-ray emission is produced by cosmic rays (CRs) interacting with the interstellar gas and radiation field. Measurements by the Energetic Gamma-Ray Experiment Telescope (EGRET) instrument on the Compton Gamma-Ray Observatory ...
A. A. Abdo, A. A. Moiseev, A. Brez, A. Chekhtman, A. de Angelis, A. K. Harding, A. Makeev, A. Morselli, A. Okumura, A. P. Waite, A. Reimer, A. S. Johnson, A. Sander, A. Sellerholm, A. Tramacere, A. W. Borgland, A. W. Strong, A. Y. Rodriguez, B. Anderson, 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. D. Dermer, D. A. Smith, D. Bastieri, D. Dumora, D. F. Torres, D. Gaggero, D. J. Suson, D. J. Thompson, D. Paneque, D. Parent, D. Sanchez, E. Bonamente, E. Charles, E. D. Bloom, E. do Couto e Silva, E. Hays, E. Nuss, E. Orlando, E. Striani, F. de Palma, F. Gargano, F. Giordano, F. Kuehn, F. Longo, F. Loparco, F. Piron, F. Ryde, F. W. Stecker, G. A. Caliandro, G. Barbiellini, G. Di Bernardo, G. Godfrey, G. Jóhannesson, G. M. Madejski, G. Spandre, G. Tosti, H. Dereli, H. F.-W. Sadrozinski, H. Katagiri, H. Tajima, H. Takahashi, 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.-L. Starck, K. Bechtol, K. S. Wood, L. Baldini, L. Breiman, L. Guillemot, L. Latronico, L. Tibaldo, M. Ackermann, M. Ackermann, M. Ajello, M. Axelsson, M. Brigida, M. Dormody, M. E. Monzani, M. Frailis, M. Hayashida, M. Kerr, M. Kuss, M. L. Kocian, M. N. Lovellette, M. N. Mazziotta, M. Pepe, M. Pesce-Rollins, M. Razzano, M. Roth, M. S. Strickman, M. Ziegler, M.-H. Grondin, N. Gehrels, N. Giglietto, N. Kawai, N. Omodei, N. Vilchez, O. Reimer, P. A. Caraveo, P. Bruel, P. D. Smith, P. F. Michelson, P. Fusco, P. L. Nolan, P. Lubrano, P. M. Saz Parkinson, P. S. Drell, P. Spinelli, P. Wang, R. A. Cameron, R. Bellazzini, R. Claus, R. D. Blandford, R. Dubois, R. E. Hughes, R. P. Johnson, R. Rando, S. Ciprini, S. Funk, S. Germani, S. Guiriec, S. J. Fegan, S. Murgia, S. Rainò, S. Ritz, S. W. Digel, T. A. Porter, T. Glanzman, T. H. Burnett, T. J. Johnson, T. Kamae, T. L. Usher, T. Mizuno, T. Ohsugi, T. Reposeur, T. Tanaka, T. Ylinen, V. Pelassa, V. Vasileiou, V. Vitale, V. L. Ginzburg, W. B. Atwood, W. B. Focke, W. McConville, W. Mitthumsiri, W. N. Johnson, Y. Edmonds, Y. Fukazawa, Y. Hanabata, Y. Uchiyama   +177 more
core   +3 more sources

Unveiling the Origin of the Fermi Bubbles

Galaxies, 2018
The Fermi bubbles, two giant structures above and below the Galactic center (GC), are among the most important discoveries of the Fermi Gamma-ray Space Telescope.
H.-Y. Karen Yang, Mateusz Ruszkowski, Ellen G. Zweibel   +2 more
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

Unraveling the Physics of Quasar Jets: Optical Polarimetry and Implications for the X-ray Emission Process

Galaxies, 2020
Since the launch of Chandra twenty years ago, one of the greatest mysteries surrounding Quasar Jets is the production mechanism for their extremely high X-ray luminosity. Two mechanisms have been proposed. In the first view, the X-ray emission is inverse-
Eric S. Perlman, Devon Clautice, Sayali Avachat, Mihai Cara, William B. Sparks, Markos Georganopoulos, Eileen Meyer   +6 more
doaj   +1 more source

TeV Dark Matter Searches in the Extragalactic Gamma-ray Sky

Galaxies, 2022
High-energetic gamma rays from astrophysical targets constitute a unique probe for annihilation or decay of heavy particle dark matter (DM). After several decades, diverse null detections have resulted in strong constraints for DM particle masses up to ...
Moritz Hütten, Daniel Kerszberg
doaj   +1 more source

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí, Pedro L. Luque‐Escamilla, Benito Marcote, Daniel del Ser, Gustavo E. Romero, Cintia S. Peri   +5 more
wiley   +1 more source