1999ApJ...526L..81M

Query : 1999ApJ...526L..81M

1999ApJ...526L..81M - Astrophys. J., 526, L81-L84 (1999/December-1)

Simultaneous X-ray and TeV observations of a rapid flare from Markarian 421.

MARASCHI L., FOSSATI G., TAVECCHIO F., CHIAPPETTI L., CELOTTI A., GHISELLINI G., GRANDI P., PIAN E., TAGLIAFERRI G., TREVES A., BRESLIN A.C., BUCKLEY J.H., CARTER-LEWIS D.A., CATANESE M., CAWLEY M.F., FEGAN D.J., FEGAN S., FINLEY J., GAIDOS J., HALL T., HILLAS A.M., KRENNRICH F., LESSARD R.W., MASTERSON C., MORIARTY P., QUINN J., ROSE J., SAMUELSON F., WEEKES T.C., URRY C.M. and TAKAHASHI T.

Abstract (from CDS):

Mrk 421 was observed for about 2 days with BeppoSAX in 1998 April as part of a worldwide multiwavelength campaign. A large, well-defined flare was observed in X-rays. The same flare was observed simultaneously at TeV energies by the Whipple Observatory gamma-ray telescope. These data provide (1) the first evidence that the X-ray and TeV intensities are well correlated on timescales of hours and (2) the first exactly simultaneous X-ray and TeV spectra. The results imply that the X-ray and TeV photons derive from the same region and from the same population of relativistic electrons. The physical parameters deduced from a homogeneous synchrotron self-Compton model for the spectral energy distribution yield electron cooling times close to the observed variability timescales.

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Journal keyword(s): Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421 - Galaxies: Active - Galaxies: Jets - Gamma Rays: Observations - X-Rays: Galaxies

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 - 2026 		#notes
1 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
2 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
3 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1

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