SIMBAD references

2002A&A...391L..25D - Astronomy and Astrophysics, volume 391, L25-28 (2002/9-1)

Detection of the BL Lac object 1ES 1426+428 in the Very High Energy gamma-ray band by the CAT Telescope from 1998-2000.

DJANNATI-ATAIE A., KHELIFI B., VOROBIOV S., BAZER-BACHI R., CHOUNET L.-M., DEBIAIS G., DEGRANGE B., ESPIGAT P., FABRE B., FONTAINE G., GORET P., GOUIFFES C., MASTERSON C., PIRON F., PUNCH M., RIVOAL M., ROB L. and TAVERNET J.-P.

Abstract (from CDS):

The BL Lac Object 1ES 1426+428, at a red-shift of z=0.129, has been monitored by the Cat telescope from February 1998 to June 2000. The accumulation of 26 h of observations shows a γ-ray signal of 321 events above 250GeV at 5.2 standard deviations, determined using data analysis cuts adapted to a weak, steep-spectrum source. The source emission has an average flux of Φdiff(400GeV)=6.73±1.27stat±1.45systx10–11cm–2.s–1.TeV–1, and a very steep spectrum, with a differential spectral index of γ=-3.60±0.57 which can be refined to γ=-3.66±0.41 using a higher flux data subset. If, as expected from its broad-band properties, the Very High Energy emission is hard at the source, these observations support a strong absorption effect of γ-rays by the Intergalactic Infrared field.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: nuclei - BL Lacertae objects: individual: 1ES 1426+428 - gamma-rays: observations

Simbad objects: 3

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