Observation of very high energy γ-rays from the AGN 1ES 2344+514 in a 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. De Angelis; C. Delgado; R. De Los Reyes; B. De Lotto; E. Domingo-Santamaría; D. Dorner; M. Doro; M. Errando; M. Fagiolini; null De Angelis; D. Ferenc; E. Fernández; R. Firpo; J. Flix; M. V. Fonseca; L. Font; M. Fuchs; N. Galante; R. Garcĺa-López; M. Garczarczyk; M. Gaug; M. Giller; F. Goebel; D. Hakobyan; M. Hayashida; T. Hengstebeck; A. Herrero; D. Höhne; 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; F. Longo; J. Lopez; M. López; E. Lorenz; P. Majumdar; G. Maneva; K. Mannheim; O. Mansutti; M. Mariotti; M. Martínez; D. Mazin; C. Merck; M. Meucci; M. Meyer; J. M. Miranda; R. Mirzoyan; S. Mizobuchi; A. Moralejo; K. Nilsson; J. Ninkovic; E. Onña-Wilhelmi; N. Otte; I. Oya; D. Paneque; M. Panniello; R. Paoletti; J. M. Paredes; M. Pasanen; D. Pascoli

doi:10.1086/518431

Observation of very high energy γ-rays from the AGN 1ES 2344+514 in a 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. CamaraE. 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. De Angelis, C. Delgado, R. De Los Reyes, B. De Lotto, E. Domingo-Santamaría, D. Dorner, M. Doro, M. Errando, M. Fagiolini, De Angelis, D. Ferenc, E. Fernández, R. Firpo, J. Flix, M. V. Fonseca, L. Font, M. Fuchs, N. Galante, R. Garcĺa-López, M. Garczarczyk, M. Gaug, M. Giller, F. Goebel, D. Hakobyan, M. Hayashida, T. Hengstebeck, A. Herrero, D. Höhne, 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, F. Longo, J. Lopez, M. López, E. Lorenz, P. Majumdar, G. Maneva, K. Mannheim, O. Mansutti, M. Mariotti, M. Martínez, D. Mazin, C. Merck, M. Meucci, M. Meyer, J. M. Miranda, R. Mirzoyan, S. Mizobuchi, A. Moralejo, K. Nilsson, J. Ninkovic, E. Onña-Wilhelmi, N. Otte, I. Oya, D. Paneque, M. Panniello, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli

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Abstract

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 ±0.30stat ±0.70syst) ×10-11 cm-2s -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 σsignificance 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 ±0.12stat ±0.2syst 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. © 2007. The American Astronomical Society. All rights reserved.

Original language	English
Pages (from-to)	892-899
Journal	Astrophysical Journal
Volume	662
Issue number	2 I
DOIs	https://doi.org/10.1086/518431
Publication status	Published - 20 Jun 2007

Keywords

Gamma rays: observations

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10.1086/518431

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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., ... Pascoli, D. (2007). Observation of very high energy γ-rays from the AGN 1ES 2344+514 in a low emission state with the magic telescope. Astrophysical Journal, 662(2 I), 892-899. https://doi.org/10.1086/518431

@article{39b4631daac04bffbfc9281e576ffe8d,

title = "Observation of very high energy γ-rays from the AGN 1ES 2344+514 in a low emission state with the magic telescope",

abstract = "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 ±0.30stat ±0.70syst) ×10-11 cm-2s -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 σsignificance 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 ±0.12stat ±0.2syst 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. {\textcopyright} 2007. The American Astronomical Society. All rights reserved.",

keywords = "Gamma rays: observations",

author = "J. Albert and E. Aliu and H. Anderhub and P. Antoranz and A. Armada and C. Baixeras and Barrio, {J. A.} and H. Bartko and D. Bastieri and Becker, {J. K.} and W. Bednarek and K. Berger and C. Bigongiari and A. Biland and Bock, {R. K.} and P. Bordas and V. Bosch-Ramon and T. Bretz and I. Britvitch and M. Camara and E. Carmona and A. Chilingarian and S. Ciprini and Coarasa, {J. A.} and S. Commichau and Contreras, {J. L.} and J. Cortina and Costado, {M. T.} and V. Curtef and V. Danielyan and F. Dazzi and {De Angelis}, A. and C. Delgado and {De Los Reyes}, R. and {De Lotto}, B. and E. Domingo-Santamar{\'i}a and D. Dorner and M. Doro and M. Errando and M. Fagiolini and {De Angelis} and D. Ferenc and E. Fern{\'a}ndez and R. Firpo and J. Flix and Fonseca, {M. V.} and L. Font and M. Fuchs and N. Galante and R. Garc{\'l}a-L{\'o}pez and M. Garczarczyk and M. Gaug and M. Giller and F. Goebel and D. Hakobyan and M. Hayashida and T. Hengstebeck and A. Herrero and D. H{\"o}hne and J. Hose and Hsu, {C. C.} and P. Jacon and T. Jogler and O. Kalekin and R. Kosyra and D. Kranich and R. Kritzer and A. Laille and P. Liebing and E. Lindfors and S. Lombardi and F. Longo and J. Lopez and M. L{\'o}pez and E. Lorenz and P. Majumdar and G. Maneva and K. Mannheim and O. Mansutti and M. Mariotti and M. Mart{\'i}nez and D. Mazin and C. Merck and M. Meucci and M. Meyer and Miranda, {J. M.} and R. Mirzoyan and S. Mizobuchi and A. Moralejo and K. Nilsson and J. Ninkovic and E. On{\~n}a-Wilhelmi and N. Otte and I. Oya and D. Paneque and M. Panniello and R. Paoletti and Paredes, {J. M.} and M. Pasanen and D. Pascoli",

year = "2007",

month = jun,

day = "20",

doi = "10.1086/518431",

language = "English",

volume = "662",

pages = "892--899",

journal = "Astrophysical Journal",

issn = "0004-637X",

number = "2 I",

}

Albert, J, Aliu, E, Anderhub, H, Antoranz, P, Armada, A, Baixeras, C, Barrio, JA, Bartko, H, Bastieri, D, Becker, JK, Bednarek, W, Berger, K, Bigongiari, C, Biland, A, Bock, RK, Bordas, P, Bosch-Ramon, V, Bretz, T, Britvitch, I, Camara, M, Carmona, E, Chilingarian, A, Ciprini, S, Coarasa, JA, Commichau, S, Contreras, JL, Cortina, J, Costado, MT, Curtef, V, Danielyan, V, Dazzi, F, De Angelis, A, Delgado, C, De Los Reyes, R, De Lotto, B, Domingo-Santamaría, E, Dorner, D, Doro, M, Errando, M, Fagiolini, M, De Angelis, Ferenc, D, Fernández, E, Firpo, R, Flix, J, Fonseca, MV, Font, L, Fuchs, M, Galante, N, Garcĺa-López, R, Garczarczyk, M, Gaug, M, Giller, M, Goebel, F, Hakobyan, D, Hayashida, M, Hengstebeck, T, Herrero, A, Höhne, D, Hose, J, Hsu, CC, Jacon, P, Jogler, T, Kalekin, O, Kosyra, R, Kranich, D, Kritzer, R, Laille, A, Liebing, P, Lindfors, E, Lombardi, S, Longo, F, Lopez, J, López, M, Lorenz, E, Majumdar, P, Maneva, G, Mannheim, K, Mansutti, O, Mariotti, M, Martínez, M, Mazin, D, Merck, C, Meucci, M, Meyer, M, Miranda, JM, Mirzoyan, R, Mizobuchi, S, Moralejo, A, Nilsson, K, Ninkovic, J, Onña-Wilhelmi, E, Otte, N, Oya, I, Paneque, D, Panniello, M, Paoletti, R, Paredes, JM, Pasanen, M & Pascoli, D 2007, 'Observation of very high energy γ-rays from the AGN 1ES 2344+514 in a low emission state with the magic telescope', Astrophysical Journal, vol. 662, no. 2 I, pp. 892-899. https://doi.org/10.1086/518431

TY - JOUR

T1 - Observation of very high energy γ-rays from the AGN 1ES 2344+514 in a low emission state with the magic telescope

AU - Albert, J.

AU - Aliu, E.

AU - Anderhub, H.

AU - Antoranz, P.

AU - Armada, A.

AU - Baixeras, C.

AU - Barrio, J. A.

AU - Bartko, H.

AU - Bastieri, D.

AU - Becker, J. K.

AU - Bednarek, W.

AU - Berger, K.

AU - Bigongiari, C.

AU - Biland, A.

AU - Bock, R. K.

AU - Bordas, P.

AU - Bosch-Ramon, V.

AU - Bretz, T.

AU - Britvitch, I.

AU - Camara, M.

AU - Carmona, E.

AU - Chilingarian, A.

AU - Ciprini, S.

AU - Coarasa, J. A.

AU - Commichau, S.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Costado, M. T.

AU - Curtef, V.

AU - Danielyan, V.

AU - Dazzi, F.

AU - De Angelis, A.

AU - Delgado, C.

AU - De Los Reyes, R.

AU - De Lotto, B.

AU - Domingo-Santamaría, E.

AU - Dorner, D.

AU - Doro, M.

AU - Errando, M.

AU - Fagiolini, M.

AU - De Angelis, null

AU - Ferenc, D.

AU - Fernández, E.

AU - Firpo, R.

AU - Flix, J.

AU - Fonseca, M. V.

AU - Font, L.

AU - Fuchs, M.

AU - Galante, N.

AU - Garcĺa-López, R.

AU - Garczarczyk, M.

AU - Gaug, M.

AU - Giller, M.

AU - Goebel, F.

AU - Hakobyan, D.

AU - Hayashida, M.

AU - Hengstebeck, T.

AU - Herrero, A.

AU - Höhne, D.

AU - Hose, J.

AU - Hsu, C. C.

AU - Jacon, P.

AU - Jogler, T.

AU - Kalekin, O.

AU - Kosyra, R.

AU - Kranich, D.

AU - Kritzer, R.

AU - Laille, A.

AU - Liebing, P.

AU - Lindfors, E.

AU - Lombardi, S.

AU - Longo, F.

AU - Lopez, J.

AU - López, M.

AU - Lorenz, E.

AU - Majumdar, P.

AU - Maneva, G.

AU - Mannheim, K.

AU - Mansutti, O.

AU - Mariotti, M.

AU - Martínez, M.

AU - Mazin, D.

AU - Merck, C.

AU - Meucci, M.

AU - Meyer, M.

AU - Miranda, J. M.

AU - Mirzoyan, R.

AU - Mizobuchi, S.

AU - Moralejo, A.

AU - Nilsson, K.

AU - Ninkovic, J.

AU - Onña-Wilhelmi, E.

AU - Otte, N.

AU - Oya, I.

AU - Paneque, D.

AU - Panniello, M.

AU - Paoletti, R.

AU - Paredes, J. M.

AU - Pasanen, M.

AU - Pascoli, D.

PY - 2007/6/20

Y1 - 2007/6/20

N2 - 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 ±0.30stat ±0.70syst) ×10-11 cm-2s -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 σsignificance 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 ±0.12stat ±0.2syst 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. © 2007. The American Astronomical Society. All rights reserved.

AB - 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 ±0.30stat ±0.70syst) ×10-11 cm-2s -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 σsignificance 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 ±0.12stat ±0.2syst 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. © 2007. The American Astronomical Society. All rights reserved.

KW - Gamma rays: observations

U2 - 10.1086/518431

DO - 10.1086/518431

M3 - Article

SN - 0004-637X

VL - 662

SP - 892

EP - 899

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 I

ER -

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

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