2002ApJ...580..104P

Query : 2002ApJ...580..104P

2002ApJ...580..104P - Astrophys. J., 580, 104-109 (2002/November-3)

The TeV spectrum of H1426+428.

PETRY D., BOND I.H., BRADBURY S.M., BUCKLEY J.H., CARTER-LEWIS D.A., CUI W., DUKE C., DE LA CALLE PEREZ I., FALCONE A., FEGAN D.J., FEGAN S.J., FINLEY J.P., GAIDOS J.A., GIBBS K., GAMMELL S., HALL J., HALL T.A., HILLAS A.M., HOLDER J., HORAN D., JORDAN M., KERTZMAN M., KIEDA D., KILDEA J., KNAPP J., KOSACK K., KRENNRICH F., LE BOHEC S., MORIARTY P., MULLER D., NAGAI T.N., ONG R., PAGE M., PALLASSINI R., POWER-MOONEY B., QUINN J., REAY N.W., REYNOLDS P.T., ROSE H.J., SCHROEDTER M., SEMBROSKI G.H., SIDWELL R., STANTON N., SWORDY S.P., VASSILIEV V.V., WAKELY S.P., WALKER G. and WEEKES T.C.

Abstract (from CDS):

The BL Lac object H1426+428 was recently detected as a high-energy γ-ray source by the VERITAS collaboration (Horan et al.). We have reanalyzed the 2001 portion of the data used in the detection in order to examine the spectrum of H1426+428 above 250 GeV. We find that the time-averaged spectrum agrees with a power law of the shape

(dF)/(dE)(E)=10–7.31±0.15stat±0.16systE–3.50±0.35stat±0.05syst_m-2s-1TeV-1^.

The statistical evidence from our data for emission above 2.5 TeV is 2.6 σ. At the 95% confidence level, the integral flux of H1426+428 above 2.5 TeV is larger than 3% of the corresponding flux from the Crab Nebula. The spectrum is consistent with the (noncontemporaneous) measurement by Aharonian et al. both in shape and in normalization. Below 800 GeV, the data clearly favor a spectrum steeper than that of any other TeV blazar observed so far, indicating a difference in the processes involved either at the source or in the intervening space.


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Journal keyword(s): Galaxies: BL Lacertae Objects: Individual: Alphanumeric: H1426+428 - Gamma Rays: Observations

Simbad objects: 5

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Number of rows : 5
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 RX J1428.5+4240 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 549 1
5 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2

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