2002ApJ...571..753H

Query : 2002ApJ...571..753H

2002ApJ...571..753H - Astrophys. J., 571, 753-762 (2002/June-1)

Detection of the BL Lacertae object H1426+428 at TeV gamma-ray energies.

HORAN D., BADRAN H.M., BOND I.H., BRADBURY S.M., BUCKLEY J.H., CARSON M.J., CARTER-LEWIS D.A., CATANESE M., CUI W., DUNLEA S., DAS D., DE LA CALLE PEREZ I., D'VALI M., FEGAN D.J., FEGAN S.J., FINLEY J.P., GAIDOS J.A., GIBBS K., GILLANDERS G.H., HALL T.A., HILLAS A.M., HOLDER J., JORDAN M., KERTZMAN M., KIEDA D., KILDEA J., KNAPP J., KOSACK K., KRENNRICH F., LANG M.J., LE BOHEC S., LESSARD R., LLOYD-EVANS J., McKERNAN B., MORIARTY P., MULLER D., ONG R., PALLASSINI R., PETRY D., QUINN J., REAY N.W., REYNOLDS P.T., ROSE H.J., SEMBROSKI G.H., SIDWELL R., STANTON N., SWORDY S.P., VASSILIEV V.V., WAKELY S.P. and WEEKES T.C.

Abstract (from CDS):

A very high energy γ-ray signal has been detected at the 5.5 σ level from H1426+428, an X-ray-selected BL Lacertae object at a redshift of 0.129. The object was monitored from 1995 to 1998 with the Whipple 10 m imaging atmospheric Cerenkov telescope as part of a general blazar survey; the results of these observations, although not statistically significant, were consistently positive. X-ray observations of H1426+428 during 1999 with the BeppoSAX instrument revealed that the peak of its synchrotron spectrum occurs at greater than 100 keV, leading to the prediction of observable TeV emission from this object. H1426+428 was monitored extensively at the Whipple Observatory during the 1999, 2000, and 2001 observing seasons. The strongest TeV signals were detected in 2000 and 2001. During 2001, an integral flux of 2.04±0.35x10–11 cm–2.s–1 above 280 GeV was recorded from H1426+428. The detection of H1426+428 supports the idea that, as also seen in Mrk 501 and 1ES 2344+514, BL Lacertae objects with extremely high synchrotron peak frequencies produce γ-rays in the TeV range.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 1426+42.8 - Gamma Rays: Observations

Simbad objects: 14

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Number of rows : 14
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 2MASS J01230864+3420485 BLL 01 23 08.6375580816 +34 20 48.664188060     15.2 16.8   ~ 123 1
2 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 887 1
3 M 1 SNR 05 34 30.9 +22 00 53           ~ 6189 1
4 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5253 0
5 QSO B0548-322 BLL 05 50 40.5705144672 -32 16 16.484718648   16.07 15.5     ~ 408 1
6 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2670 1
7 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3041 2
8 QSO B1426+428 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 518 2
9 7C 165211.80+395026.00 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2158 2
10 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 625 2
11 QSO B2155-304 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1731 1
12 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2258 1
13 QSO B2344+514 BLL 23 47 04.8372110928 +51 42 17.877513168     15.50 10.7   ~ 461 0
14 QSO B2356-309 BLL 23 59 07.9034996184 -30 37 40.671098544   18.414 16.44 16.795   ~ 299 1

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