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

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

2002A&A...384L..23A - Astronomy and Astrophysics, volume 384, L23-26 (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±2_stat±1_syst)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

Full paper

View the references in ADS

Number of rows : 12

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2023	#notes
1	M 1	SNR	05 34 30.9	+22 00 53					~	6095	1
2	V* CM Tau	Psr	05 34 31.9474694616	+22 00 52.153698024					~	5173	0
3	Mrk 421	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31	~	2615	1
4	[VV98] J142820.4+423138	QSO	14 28 20.4318979968	+42 31 38.678467692		18.53	18.26		~	14	0
5	QSO B1426+428	BLL	14 28 32.6090008440	+42 40 21.048123396		16.95	16.45	14.4	~	499	2
6	ClG J1429+4241	ClG	14 29 06.4	+42 41 10					~	26	0
7	2MASX J14294504+4240548	Sy1	14 29 45.0299636184	+42 40 54.940843632		18.85	18.28		~	19	0
8	7C 1428+4218	QSO	14 30 23.74163471	+42 04 36.4910561		24.43	22.04	20.2	~	143	1
9	7C 165211.80+395026.00	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26	~	2108	2
10	QSO B1959+650	BLL	19 59 59.8520303688	+65 08 54.652536492			12.8	11.21	~	596	2
11	QSO B2155-304	BLL	21 58 52.0652249880	-30 13 32.118447792		13.36	13.09	12.62	~	1698	1
12	QSO B2344+514	BLL	23 47 04.8372110928	+51 42 17.877513168			15.50	10.7	~	438	0

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