2005ApJ...634..947S

Query : 2005ApJ...634..947S

2005ApJ...634..947S - Astrophys. J., 634, 947-954 (2005/December-1)

A very high energy gamma-ray spectrum of 1ES 2344+514.

SCHROEDTER M., BADRAN H.M., BUCKLEY J.H., BUSSONS GORDO J., CARTER-LEWIS D.A., DUKE C., FEGAN D.J., FEGAN S.F., FINLEY J.P., GILLANDERS G.H., GRUBE J., HORAN D., KENNY G.E., KERTZMAN M., KOSACK K., KRENNRICH F., KIEDA D.B., KILDEA J., LANG M.J., LEE K., MORIARTY P., QUINN J., QUINN M., POWER-MOONEY B., SEMBROSKI G.H., WAKELY S.P., VASSILIEV V.V., WEEKES T.C. and ZWEERINK J.

Abstract (from CDS):

The BL Lacertae (BL Lac) object 1ES 2344+514 (1ES 2344), at a redshift of 0.044, was discovered as a source of very high energy (VHE) gamma rays by the Whipple collaboration in 1995 (Catanese et al.). This detection was recently confirmed by the HEGRA collaboration (Tluczykont et al.). As is typical for high-frequency-peaked blazars, the VHE gamma-ray emission is highly variable. On the night of 1995 December 20, a gamma-ray flare of 5.3 σ significance was detected, the brightest outburst from this object to date. The emission region is compatible with a point source. The spectrum between 0.8 and 12.6 TeV can be described by a power law,

(d3N)/(dEdAdt)=(5.1±1.0st±1.2sy)x10–7(E/TeV)–2.54±0.17st±0.07sy_^/TeV/m2/s.

If we compare the spectral index with that of the other five confirmed TeV blazars, the spectrum of 1ES 2344 is similar to that of 1ES 1959+650, which is located at almost the same distance. The spectrum of 1ES 2344 is steeper than the brightest flare spectra of Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501), both of which are located at a distance about two-thirds that of 1ES 2344, and harder than the spectra of PKS 2155-304 and H1426+428, which are located almost 3 times as far away. This trend is consistent with attenuation caused by the infrared extragalactic background radiation.


Abstract Copyright: ∼

Journal keyword(s): Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 2344+514 - Gamma Rays: Observations

Simbad objects: 7

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Number of rows : 7
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 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
2 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
3 RX J1428.5+4240 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 549 1
4 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
5 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 699 2
6 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1
7 QSO B2344+514 BLL 23 47 04.8372110928 +51 42 17.877513168     15.50 10.7   ~ 500 1

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