2001A&A...374..895P


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET10:43:22

2001A&A...374..895P - Astronomy and Astrophysics, volume 374, 895-906 (2001/8-2)

Temporal and spectral gamma-ray properties of Mkn 421 above 250 GeV from CAT observations between 1996 and 2000.

PIRON F., DJANNATI-ATAIE A., PUNCH M., TAVERNET J.-P., BARRAU A., BAZER-BACHI R., CHOUNET L.-M., DEBIAIS G., DEGRANGE B., DEZALAY J.-P., 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. and VOROBIOV S.

Abstract (from CDS):

The γ-ray emission above 250 GeV from the BL Lac object Markarian 421 was 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: (dφ)/(dE)∝ETeV^-2.88±0.12(stat)±0.06(syst). 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.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - BL Lacertae objects: individual: Mkn 421 - gamma-rays: observations

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5703 4
2 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2427 1
3 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1954 2

    Equat.    Gal    SGal    Ecl

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2021.03.03-10:43:22

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