2007ApJ...662..892A

Query : 2007ApJ...662..892A

2007ApJ...662..892A - Astrophys. J., 662, 892-899 (2007/June-3)

Observation of very high energy γ-rays from the AGN 1ES 2344+514 in a low emission state with the MAGIC telescope.

ALBERT J., ALIU E., ANDERHUB H., ANTORANZ P., ARMADA A., BAIXERAS C., BARRIO J.A., BARTKO H., BASTIERI D., BECKER J.K., BEDNAREK W., BERGER K., BIGONGIARI C., BILAND A., BOCK R.K., BORDAS P., BOSCH-RAMON V., BRETZ T., BRITVITCH I., CAMARA M., CARMONA E., CHILINGARIAN A., CIPRINI S., COARASA J.A., COMMICHAU S., CONTRERAS J.L., CORTINA J., COSTADO M.T., CURTEF V., DANIELYAN V., DAZZI F., DE ANGELIS A., DELGADO C., DE LOS REYES R., DE LOTTO B., DOMINGO-SANTAMARIA E., DORNER D., DORO M., ERRANDO M., FAGIOLINI M., DE ANGELIS M., FERENC D., FERNANDEZ E., FIRPO R., FLIX J., FONSECA M.V., FONT L., FUCHS M., GALANTE N., GARCIA-LOPEZ R., GARCZARCZYK M., GAUG M., GILLER M., GOEBEL F., HAKOBYAN D., HAYASHIDA M., HENGSTEBECK T., HERRERO A., HOHNE D., HOSE J., HSU C.C., JACON P., JOGLER T., KALEKIN O., KOSYRA R., KRANICH D., KRITZER R., LAILLE A., LIEBING P., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ J., LOPEZ M., LORENZ E., MAJUMDAR P., MANEVA G., MANNHEIM K., MANSUTTI O., MARIOTTI M., MARTINEZ M., MAZIN D., MERCK C., MEUCCI M., MEYER M., MIRANDA J.M., MIRZOYAN R., MIZOBUCHI S., MORALEJO A., NILSSON K., NINKOVIC J., ONA-WILHELMI E., OTTE N., OYA I., PANEQUE D., PANNIELLO M., PAOLETTI R., PAREDES J.M., PASANEN M., PASCOLI D., PAUSS F., PEGNA R., PERSIC M., PERUZZO L., PICCIOLI A., POLLER M., PRANDINI E., PUCHADES N., RAYMERS A., RHODE W., RIBO M., RICO J., RISSI M., ROBERT A., RUGAMER S., SAGGION A., SANCHEZ A., SARTORI P., SCALZOTTO V., SCAPIN V., SCHMITT R., SCHWEIZER T., SHAYDUK M., SHINOZAKI K., SHORE S.N., SIDRO N., SILLANPAA A., SOBCZYNSKA D., STAMERRA A., STARK L.S., TAKALO L., TEMNIKOV P., TESCARO D., TESHIMA M., TONELLO N., TORRES D.F., TURINI N., VANKOV H., VITALE V., WAGNER R.M., WIBIG T., WITTEK W., ZANDANEL F., ZANIN R. and ZAPATERO J.

Abstract (from CDS):

The MAGIC collaboration has observed very high energy gamma-ray emission from the AGN 1ES 2344+514. A gamma-ray signal corresponding to an 11 σ excess and an integral flux of (2.38±0.30_stat±0.70_syst)x10^–11/cm2/s above 200 GeV has been obtained from 23.1 hr of data taking between 2005 August 3 and 2006 January 1. The data confirm the previously detected gamma-ray emission from this object during a flare seen by the Whipple collaboration in 1995 and the evidence (below 5 σ significance level) from long-term observations conducted by the Whipple and HEGRA groups. The MAGIC observations show a relatively steep differential photon spectrum that can be described by a power law with a photon index of α=-2.95±0.12_stat±0.2_syst between 140 GeV and 5.4 TeV. The observations reveal a low-flux state, about 6 times below the 1995 flare seen by Whipple and comparable with the previous Whipple and HEGRA long-term measurements. During the MAGIC observations no significant time variability was observed.

Abstract Copyright: ∼

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

Simbad objects: 7

Full paper

View the references in ADS

Number of rows : 7

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	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
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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