2002A&A...384L..23A

Query : 2002A&A...384L..23A

2002A&A...384L..23A - Astronomy and Astrophysics, volume 384L23-26 (2002/3-4)

TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation.

AHARONIAN F., AKHPERJANIAN A., BARRIO J., BEILICKE M., BERNLOEHR K., BOERST H., BOJAHR H., BOLZ O., CONTRERAS J., CORNILS R., CORTINA J., DENNINGHOFF S., FONSECA V., GIRMA M., GONZALEZ J., GOETTING N., HEINZELMANN G., HERMANN G., HEUSLER A., HOFMANN W., HORNS D., JUNG I., KANKANYAN R., KESTEL M., KETTLER J., KOHNLE A., KONOPELKO A., KORNMEYER H., KRANICH D., KRAWCZYNSKI H., LAMPEITL H., LOPEZ M., LORENZ E., LUCARELLI F., MAGNUSSEN N., MANG O., MEYER H., MIRZOYAN R., MORALEJO A., ONA E., PADILLA L., PANTER M., PLAGA R., PLYASHESHNIKOV A., PUEHLHOFER G., RAUTERBERG G., ROEHRING A., RHODE W., ROBRADE J., ROWELL G., SAHAKIAN V., SAMORSKI M., SCHILLING M., SCHROEDER F., SEVILLA I., SIEMS M., STAMM W., TLUCZYKONT M., VOELK H.J., WIEDNER C.A. and WITTEK W.

Abstract (from CDS):

The detection of TeV γ-rays from the blazar H1426+428 at an integral flux level of (4±2stat±1syst)x10–12erg/cm2/s above 1TeV with the HEGRA imaging atmospheric Cherenkov telescope system is reported. H1426+428 is located at a redshift of z=0.129, which makes it the most distant source detected in TeV γ-rays so far. The TeV radiation is expected to be strongly absorbed by the diffuse extragalactic background radiation (DEBRA). The observed energy spectrum of TeV photons is in good agreement with an intrinsic power law spectrum of the source ∝E–1.9 corrected for DEBRA absorption. Statistical errors as well as uncertainties about the intrinsic source spectrum, however, do not permit strong statements about the density of the DEBRA infrared photon field.

Abstract Copyright: ∼

Journal keyword(s): BL Lacertae objects: individual: H 1426+428 - gamma rays: observations - diffuse radiation

Simbad objects: 12

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Number of rows : 12
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 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
3 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
4 [VV98] J142820.4+423138 QSO 14 28 20.4318979968 +42 31 38.678467692   18.53 18.26     ~ 15 0
5 RX J1428.5+4240 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 549 1
6 ClG J1429+4241 ClG 14 29 06.4 +42 41 10           ~ 27 0
7 SDSS J142945.02+424054.9 Sy2 14 29 45.0299636184 +42 40 54.940843632   18.85 18.28     ~ 20 0
8 7C 1428+4218 Bla 14 30 23.74163471 +42 04 36.4910561   24.43 22.04 20.2   ~ 157 1
9 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
10 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 699 2
11 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1
12 QSO B2344+514 BLL 23 47 04.8372110928 +51 42 17.877513168     15.50 10.7   ~ 500 1

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