2005ApJ...621..181D

Query : 2005ApJ...621..181D

2005ApJ...621..181D - Astrophys. J., 621, 181-187 (2005/March-1)

Spectrum of very high energy gamma-rays from the blazar 1ES 1959+650 during flaring activity in 2002.

DANIEL M.K., BADRAN H.M., BOND I.H., BOYLE P.J., BRADBURY S.M., BUCKLEY J.H., CARTER-LEWIS D.A., CATANESE M., CELIK O., COGAN P., CUI W., D'VALI M., DE LA CALLE PEREZ I., DUKE C., FALCONE A., FEGAN D.J., FEGAN S.J., FINLEY J.P., FORTSON L.F., GAIDOS J.A., GAMMELL S., GIBBS K., GILLANDERS G.H., GRUBE J., HALL J., HALL T.A., HANNA D., HILLAS A.M., HOLDER J., HORAN D., HUMENSKY T.B., JARVIS A., JORDAN M., KENNY G.E., KERTZMAN M., KIEDA D., KILDEA J., KNAPP J., KOSACK K., KRAWCZYNSKI H., KRENNRICH F., LANG M.J., LE BOHEC S., LINTON E., LLOYD-EVANS J., MILOVANOVIC A., MORIARTY P., MULLER D., NAGAI T., NOLAN S., ONG R.A., PALLASSINI R., PETRY D., POWER-MOONEY B., QUINN J., QUINN M., RAGAN K., REBILLOT P., REYNOLDS P.T., ROSE H.J., SCHROEDTER M., SEMBROSKI G.H., SWORDY S.P., SYSON A., VASSILIEV V.V., WAKELY S.P., WALKER G., WEEKES T.C. and ZWEERINK J.

Abstract (from CDS):

The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cerenkov Telescope in 2002 May. A spectral analysis has been carried out on the data from that time period, and the resulting very high energy gamma-ray spectrum (E≥316 GeV) can be well fitted by a power law of differential spectral index α=2.78±0.12_stat±0.21_sys. On 2002 June 4, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an ``orphan'' gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with α=2.82±0.15_stat±0.30_sys. There is no compelling evidence for spectral variability or for any cutoff to the spectrum.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: BL Lacertae Objects: Individual: Alphanumeric: 1ES 1959+650 - Gamma Rays: Observations - Techniques: Spectroscopic

Simbad objects: 5

Full paper

View the references in ADS

Number of rows : 5

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2024	#notes
1	M 1	SNR	05 34 30.9	+22 00 53					~	6199	1
2	V* CM Tau	Psr	05 34 31.9474694616	+22 00 52.153698024					~	5267	0
3	Mrk 421	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31	~	2682	1
4	7C 165211.80+395026.00	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26	~	2170	2
5	QSO B1959+650	BLL	19 59 59.8520303688	+65 08 54.652536492			12.8	11.21	~	628	2

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