2005A&A...436L..17A

Query : 2005A&A...436L..17A

2005A&A...436L..17A - Astronomy and Astrophysics, volume 436, L17-20 (2005/6-3)

Discovery of VHE gamma rays from PKS 2005-489.

AHARONIAN F., AKHPERJANIAN A.G., AYE K.-M., BAZER-BACHI A.R., BEILICKE M., BENBOW W., BERGE D., BERGHAUS P., BERNLOEHR K., BOISSON C., BOLZ O., BRAUN I., BREITLING F., BROWN A.M., BUSSONS GORDO J., CHADWICK P.M., CHOUNET L.-M., CORNILS R., COSTAMANTE L., DEGRANGE B., DJANNATI-ATAIE A., DRURY L.O'C., DUBUS G., EMMANOULOPOULOS D., ESPIGAT P., FEINSTEIN F., FLEURY P., FONTAINE G., FUCHS Y., FUNK S., GALLANT Y.A., GIEBELS B., GILLESSEN S., GLICENSTEIN J.F., GORET P., HADJICHRISTIDIS C., HAUSER M., HEINZELMANN G., HENRI G., HERMANN G., HINTON J.A., HOFMANN W., HOLLERAN M., HORNS D., DE JAGER O.C., KHELIFI B., KOMIN N., KONOPELKO A., LATHAM I.J., LE GALLOU R., LEMIERE A., LEMOINE-GOUMARD M., LEROY N., LOHSE T., MARTINEAU-HUYNH O., MARCOWITH A., MASTERSON C., McCOMB T.J.L., DE NAUROIS M., NOLAN S.J., NOUTSOS A., ORFORD K.J., OSBORNE J.L., OUCHRIF M., PANTER M., PELLETIER G., PITA S., PUEHLHOFER G., PUNCH M., RAUBENHEIMER B.C., RAUE M., RAUX J., RAYNER S.M., REDONDO I., REIMER A., REIMER O., RIPKEN J., ROB L., ROLLAND L., ROWELL G., SAHAKIAN V., SAUGE L., SCHLENKER S., SCHLICKEISER R., SCHUSTER C., SCHWANKE U., SIEWERT M., SOL H., STEENKAMP R., STEGMANN C., TAVERNET J.-P., TERRIER R., THEORET C.G., TLUCZYKONT M., VASILEIADIS G., VENTER C., VINCENT P., VOELK H.J. and WAGNER S.J.

Abstract (from CDS):

The high-frequency peaked BL Lac PKS 2005-489 (z=0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7σ level in the 2004 observations (24.2h live time), but not in the 2003 data set (27.3h live time). PKS 2005-489 is the first blazar independently discovered by HESS to be an emitter of VHE photons, and only the second such blazar in the Southern Hemisphere. The integral flux above 200 GeV observed in 2004 is (6.9±1.0stat±1.4syst)x10–12/cm2/s, corresponding to ∼2.5% of the flux observed from the Crab Nebula. The 99% upper limit on the flux in 2003, I(>200GeV)<5.2x10–12/cm2/s, is smaller than the flux measured in 2004, suggesting an increased level of activity in 2004. However, the data show no evidence for significant variability on any time scale less than a year. An energy spectrum is measured and is characterized by a very soft power law (photon index of Γ=4.0±0.4).

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Journal keyword(s): galaxies: active - BL Lacertae objects: individual: PKS 2005-489 - 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 - 2024 		#notes
1 M 1 SNR 05 34 30.9 +22 00 53           ~ 6191 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5258 0
3 QSO B2005-489 BLL 20 09 25.3903899240 -48 49 53.725051056   15.75 12.81 11.41   ~ 576 2

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