he MAGIC collaboration has observed very high energy gamma-ray emission from the AGN 1ES 2344+514. A gamma-ray signal corresponding to an 11 sigma excess and an integral flux of ( 2.38 +/- 0.30(stat) +/- 0.70(syst)) x 10(-11) cm(-2) s(-1) 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 sigma 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 alpha = -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.

Observation of very high energy gamma-rays from the AGN 1ES 2344+514 in low emission state with the magic telescope / J., Albert; E., Aliu; H., Anderhub; P., Antoranz; A., Armada; C., Baixeras; J. A., Barrio; H., Bartko; D., Bastieri; J. K., Becker; W., Bednarek; K., Berger; C., Bigongiari; A., Biland; R. K., Bock; P., Bordas; V., Bosch Ramon; T., Bretz; I., Britvitch; M., Camara; E., Carmona; A., Chilingarian; S., Ciprini; J. A., Coarasa; S., Commichau; J. L., Contreras; J., Cortina; M. T., Costado; V., Curtef; V., Danielyan; F., Dazzi; A. D., Angelis; C., Delgado; R. D. L., Reyes; B. D., Lotto; E., Domingo Santamaria; D., Dorner; M., Doro; M., Errando; M., Fagiolini; D., Angelis; D., Ferenc; E., Fernandez; R., Firpo; J., Flix; M. V., Fonseca; L., Font; M., Fuchs; N., Galante; R., Garcia Lopez; M., Garczarczyk; M., Gaug; M., Giller; F., Goebel; D., Hakobyan; M., Hayashida; T., Hengstebeck; A., Herrero; D., Hohne; J., Hose; C. C., Hsu; P., Jacon; T., Jogler; O., Kalekin; R., Kosyra; D., Kranich; R., Kritzer; A., Laille; P., Liebing; E., Lindfors; S., Lombardi; Longo, Francesco; J., Lopez; M., Lopez; E., Lorenz; P., Majumdar; G., Maneva; K., Mannheim; O., Mansutti; M., Mariotti; M., Martinez; D., Mazin; C., Merck; M., Meucci; M., Meyer; J. M., Miranda; R., Mirzoyan; S., Mizobuchi; A., Moralejo; K., Nilsson; J., Ninkovic; E., Onna Wilhelmi; N., Otte; I., Oya; D., Paneque; M., Panniello; R., Paoletti; J. M., Paredes; M., Pasanen; D., Pascoli; F., Pauss; R., Pegna; M., Persic; L., Peruzzo; A., Piccioli; M., Poller; E., Prandini; N., Puchades; A., Raymers; W., Rhode; M., Ribo; J., Rico; M., Rissi; A., Robert; S., Rugamer; A., Saggion; A., Sanchez; P., Sartori; V., Scalzotto; V., Scapin; R., Schmitt; T., Schweizer; M., Shayduk; K., Shinozaki; S. N., Shore; N., Sidro; A., Sillanpaa; D., Sobczynska; A., Stamerra; L. S., Stark; L., Takalo; P., Temnikov; D., Tescaro; M., Teshima; N., Tonello; D. F., Torres; N., Turini; H., Vankov; V., Vitale; R. M., Wagner; T., Wibig; W., Wittek; F., Zandanel; R., Zanin; J., Zapatero. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 662:(2007), pp. 892-899.

Observation of very high energy gamma-rays from the AGN 1ES 2344+514 in low emission state with the magic telescope

LONGO, FRANCESCO;
2007-01-01

Abstract

he MAGIC collaboration has observed very high energy gamma-ray emission from the AGN 1ES 2344+514. A gamma-ray signal corresponding to an 11 sigma excess and an integral flux of ( 2.38 +/- 0.30(stat) +/- 0.70(syst)) x 10(-11) cm(-2) s(-1) 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 sigma 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 alpha = -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.
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