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Titolo:
Temporal and spectral gamma-ray properties of Mkn 421 above 250 GeV from CAT observations between 1996 and 2000
Autore:
Piron, F; Djannati-Atai, A; Punch, M; Tavernet, JP; Barrau, A; Bazer-Bachi, R; Chounet, LM; Debiais, G; Degrange, B; Dezalay, JP; Espigat, P; Fabre, B; Fleury, P; Fontaine, G; Goret, P; Gouiffes, C; Khelifi, B; Malet, I; Masterson, C; Mohanty, G; Nuss, E; Renault, C; Rivoal, M; Rob, L; Vorobiov, S;
Indirizzi:
Univ Toulouse 3, Ctr Etud Spatiale Rayonnements, INSU, CNRS, Toulouse, France Univ Toulouse 3 Toulouse France onnements, INSU, CNRS, Toulouse, France Univ Perpignan, Grp Phys Fondamentale, F-66025 Perpignan, France Univ Perpignan Perpignan France F-66025 ntale, F-66025 Perpignan, France Ecole Polytech, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, Palaiseau, France Ecole Polytech Palaiseau France cl & Hautes Energies, Palaiseau, France Univ Paris 06, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, Palaiseau, France Univ Paris 06 Palaiseau France ucl & Hautes Energies, Palaiseau, France Univ Paris 07, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, Palaiseau, France Univ Paris 07 Palaiseau France ucl & Hautes Energies, Palaiseau, France Charles Univ, Nucl Ctr, Prague, Czech Republic Charles Univ Prague CzechRepublic iv, Nucl Ctr, Prague, Czech Republic Coll France, CNRS, IN2P3, Paris, France Coll France Paris FranceColl France, CNRS, IN2P3, Paris, France Univ Paris 08, CNRS, IN2P3, F-93526 St Denis 02, France Univ Paris 08 St Denis France 02 NRS, IN2P3, F-93526 St Denis 02, France Ctr Etud Saclay, Serv Astrophys, CEA, DSM,DAPNIA, F-91191 Gif Sur Yvette, France Ctr Etud Saclay Gif Sur Yvette France F-91191 191 Gif Sur Yvette, France
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 374, anno: 2001,
pagine: 895 - 906
SICI:
1432-0746(200108)374:3<895:TASGPO>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
LACERTAE OBJECT MARKARIAN-421; ACTIVE GALAXY MARKARIAN-421; CRAB-NEBULA; TEV PHOTONS; X-RAY; TELESCOPE; VARIABILITY; EMISSION; BLAZARS; FLARE;
Keywords:
galaxies : active; galaxies : nuclei; BL Lacert ae objects : individual : Mkn 421; gamma-rays : observations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Piron, F Univ Montpellier 2, GAM, CC 085-Bat 11,Pl Eugene Bataillon, F-34095 Montpellier 5, France Univ Montpellier 2 CC 085-Bat 11,Pl Eugene Bataillon Montpellier France 5
Citazione:
F. Piron et al., "Temporal and spectral gamma-ray properties of Mkn 421 above 250 GeV from CAT observations between 1996 and 2000", ASTRON ASTR, 374(3), 2001, pp. 895-906

Abstract

The gamma -ray emission above 250 GeV from the BL Lac object Markarian 421was observed by the CAT Cherenkov imaging telescope between December, 1996, and June, 2000. In 1998, the source produced a series of small flares, making it the second extragalactic source detected by CAT. The time-averaged differential spectrum has been measured from 0.3 to 5 TeV,which is well fitted with a power law: d phi /dE proportional to E-TeV(-2.88 +/- 0.12stat +/- 0.06syst). In 2000, the source showed an unprecedented activity, with variability time-scales as short as one hour, as for instance observed during the night between 4 and 5 February. The 2000 time-averaged spectrum measured is compatible with that of 1998, but some indication of a spectral curvature is found between 0.3 and 5 TeV. The possibility of TeV spectral hardening during flares is also discussed, and the results are compared to those obtained on the other TeV BL Lac, Markarian 501.

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Documento generato il 29/03/20 alle ore 11:54:04