نتایج جستجو برای: 421
تعداد نتایج: 3662 فیلتر نتایج به سال:
The CELESTE atmospheric Cherenkov detector ran until June 2004. It has observed the blazars Mrk 421, 1ES 1426+428 and Mrk 501. We significantly improved our understanding of the atmosphere using a LIDAR, and of the optical through-put of the detector using stellar photometry. The new data analysis provides better background rejection. We present our light curve for Mrk 421 for the 2002-2004 sea...
We present the gamma-ray spectrum of the BL Lacertae object, Markarian 421, above 500 GeV during its most intense recorded TeV flare, on 1996 May 7. The spectrum is well fitted by a power law with an exponent of (statistical and systematic errors). The spectrum extends above 5 TeV with no evidence 22.56 5 0.07 5 0.1 for a cutoff, favoring determinations of the extragalactic infrared energy dens...
Vol. XLVI (June 2009), 421–434 421 © 2009, American Marketing Association ISSN: 0022-2437 (print), 1547-7193 (electronic) *Iris W. Hung is Assistant Professor of Marketing, Department of Marketing, National University of Singapore (e-mail: [email protected]). Robert S. Wyer Jr. is Visiting Professor of Marketing, Department of Marketing, Hong Kong University of Science and Technology (e-mail...
Anthony J. Hynes 1,*, Cheryl Tatum Ernest 1,†, Deanna Donohoue 1,‡, Dieter Bauer 1 and Arnout Ter Schure 2 1 Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA; [email protected] (C.T.E.); [email protected] (D.D.); [email protected] (D.B.) 2 Electric Power ...
Since the first TeV blazar Markarian (Mrk) 421 was detected in 1992, the number of established TeV γ-ray emitting BL Lac objects has grown to 6, with redshifts ranging from 0.031 (Mrk 421) to 0.129 (H 1426+428). The intensive study of these sources has had a major impact on our understanding of the blazar phenomenon. The most notable observational results have been extremely fast large amplitud...
The Very High Energy (VHE) γ-ray emission of the closest BL Lacertæ objects Markarian 501 and Markarian 421 has been observed by the CAT telescope in 1997 and 1998. In 1997 Mrk 501 exhibited a remarkable series of flares, with a VHE emission peaking above 250 GeV. The source showed correlated emissions in the X-ray and VHE γ-ray bands, together with intensityspectral hardness correlation in the...
The Very High Energy (VHE) γ-ray emission of the closest BL Lacertæ objects Markarian 501 and Markarian 421 has been observed by the CAT telescope in 1997 and 1998. In 1997 Mrk 501 exhibited a remarkable series of flares, with a VHE emission peaking above 250 GeV. The source showed correlated emissions in the X-ray and VHE γ-ray bands, together with intensityspectral hardness correlation in the...
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