Zobrazeno 1 - 10
of 247
pro vyhledávání: '"Mattox, J."'
Autor:
Giroletti, M., Giovannini, G., Feretti, L., Cotton, W. D., Edwards, P. G., Lara, L., Marscher, A. P., Mattox, J. R., Piner, B. G., Venturi, T.
Publikováno v:
Astrophys.J.600:127-140,2004
We present the results of a high angular resolution study of the BL Lac object Markarian 501 in the radio band. We consider data taken at 14 different epochs, ranging between 1.6 GHz and 22 GHz in frequency, and including new Space VLBI observations
Externí odkaz:
http://arxiv.org/abs/astro-ph/0309285
Publikováno v:
Astrophys.J.588:155-164,2003
We report EGRET upper limits on the high-energy gamma-ray emission from clusters of galaxies. EGRET observations between 1991 and 2000 were analyzed at positions of 58 individual clusters from a flux-limited sample of nearby X-ray bright galaxy clust
Externí odkaz:
http://arxiv.org/abs/astro-ph/0301362
Publikováno v:
Astrophys.J. 578 (2002) 935-942
We present the results of deep X-ray and gamma-ray observations of the Geminga pulsar obtained in the final years of the ASCA and CGRO missions, and an upper limit from RXTE. A phase-connected ephemeris from the gamma-rays is derived that spans the y
Externí odkaz:
http://arxiv.org/abs/astro-ph/0207001
Autor:
Raiteri, C. M., Villata, M., Aller, H. D., Aller, M. F., Heidt, J., Kurtanidze, O. M., Lanteri, L., Maesano, M., Massaro, E., Montagni, F., Nesci, R., Nilsson, K., Nikolashvili, M. G., Nurmi, P., Ostorero, L., Pursimo, T., Rekola, R., Sillanpaa, A., Takalo, L. O., Terasranta, H., Tosti, G., Balonek, T. J., Feldt, M., McGrath, E. J., Heines, A., Heisler, C., Hu, J., Kidger, M., Mattox, J. R., Pati, A., Robb, R., Sadun, A. C., Shastri, P., Wagner, S. J., Wei, J., Wu, X.
New optical and radio data on the BL Lacertae object AO 0235+16 have been collected in the last four years by a wide international collaboration, which confirm the intense activity of this source. The optical data also include the results of the Whol
Externí odkaz:
http://arxiv.org/abs/astro-ph/0108165
Autor:
Takahashi, T., Kataoka, J., Madejski, G., Mattox, J., Urry, C. M., Wagner, S., Aharonian, F., Catanese, M., Chiappetti, L., Coppi, P., Degrange, B., Fossati, G., Kubo, H., Krawczynski, H., Makino, F., Marshall, H., Maraschi, L., Piron, F., Remillard, R., Takahara, F., Tashiro, M., Terasranta, H., Weekes, T.
Publikováno v:
Astrophys.J. 542 (2000) L105-L110
We conducted a multi-frequency campaign for the TeV blazar Mrk~421 in 1998 April. The campaign started from a pronounced high amplitude flare recorded by SAX and Whipple; ASCA observation started three days later. In the X-ray data, we detected multi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0008505
Autor:
Halpern, J. P., Uglesich, R., Mirabal, N., Kassin, S., Thorstensen, J., Keel, W. C., Diercks, A., Bloom, J. S., Harrison, F., Mattox, J., Eracleous, M.
The optical light curve of the energetic gamma-ray burst GRB 991216 is consistent with jet-like behavior in which a power-law decay steepens from t**(-1.22 +/- 0.04) at early times to t**(-1.53 +/- 0.05) in a gradual transition at around 2 d. The der
Externí odkaz:
http://arxiv.org/abs/astro-ph/0006206
Autor:
Tanihata, C., Takahashi, T., Kataoka, J., Madejski, G. M., Inoue, S., Kubo, H., Makino, F., Mattox, J. R., Kawai, N.
We report the variable X-ray emission from BL Lacertae detected in the ASCA ToO observation conducted during the EGRET and RXTE pointings, coincident with the 1997 July outburst. The source showed a historically high state of X-ray, optical, and gamm
Externí odkaz:
http://arxiv.org/abs/astro-ph/0006195
Autor:
Mattox, J. R.
Because of the scheduled GLAST mission by NASA, there is strong scientific justification for preparation for very extensive blazar monitoring in the optical bands to exploit the opportunity to learn about blazars through the correlation of variabilit
Externí odkaz:
http://arxiv.org/abs/astro-ph/9911014
We present results of Compton Gamma-Ray Observatory EGRET observations of the unidentified high-energy gamma-ray sources 2EG J1049-5847 (GEV J1047-5840, 3EG J1048-5840) and 2EG J1103-6106 (3EG J1102-6103). These sources are spatially coincident with
Externí odkaz:
http://arxiv.org/abs/astro-ph/9906373
Autor:
Kataoka, J., Mattox, J. R., Quinn, J., Kubo, H., Makino, F., Takahashi, T., Inoue, S., Hartman, R. C., Madejski, G. M., Sreekumar, P., Wagner, S. J.
We present the results of a multiwavelength campaign for Mrk 501 performed in March 1996 with ASCA, EGRET, Whipple, and optical telescopes. In the X-ray band, a spectral break was observed around 2 keV. We report here for the first time the detection
Externí odkaz:
http://arxiv.org/abs/astro-ph/9811014