Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes

J. Aleksić; E. A. Alvarez; L. A. Antonelli; P. Antoranz; M. Asensio; M. Backes; U. Barres De Almeida; J. A. Barrio; D. Bastieri; J. Becerra González; W. Bednarek; K. Berger; E. Bernardini; A. Biland; O. Blanch; R. K. Bock; A. Boller; G. Bonnoli; D. Borla Tridon; T. Bretz; A. Cañellas; E. Carmona; A. Carosi; P. Colin; E. Colombo; J. L. Contreras; J. Cortina; L. Cossio; S. Covino; P. Da Vela; F. Dazzi; A. De Angelis; G. De Caneva; E. De Cea Del Pozo; B. De Lotto; C. Delgado Mendez; A. Diago Ortega; M. Doert; A. Domínguez; D. Dominis Prester; D. Dorner; M. Doro; D. Eisenacher; D. Elsaesser; D. Ferenc; M. V. Fonseca; L. Font; C. Fruck; R. J.García López; M. Garczarczyk; D. Garrido; G. Giavitto; N. Godinović; S. R. Gozzini; D. Hadasch; D. Häfner; A. Herrero; D. Hildebrand; D. Höhne-Mönch; J. Hose; D. Hrupec; B. Huber; T. Jogler; V. Kadenius; H. Kellermann; S. Klepser; T. Krähenbühl; J. Krause; A. La Barbera; D. Lelas; E. Leonardo; N. Lewandowska; E. Lindfors; S. Lombardi; M. López; R. López-Coto; A. López-Oramas; E. Lorenz; M. Makariev; G. Maneva; N. Mankuzhiyil; K. Mannheim; L. Maraschi; M. Mariotti; M. Martínez; D. Mazin; M. Meucci; J. M. Miranda; R. Mirzoyan; J. Moldón; A. Moralejo; P. Munar-Adrover; A. Niedzwiecki; D. Nieto; K. Nilsson; N. Nowak; R. Orito; S. Paiano; D. Paneque; R. Paoletti

doi:10.1051/0004-6361/201118668

Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes

J. Aleksić, E. A. Alvarez, L. A. Antonelli, P. Antoranz, M. Asensio, M. Backes, U. Barres De Almeida, J. A. Barrio, D. Bastieri, J. Becerra González, W. Bednarek, K. Berger, E. Bernardini, A. Biland, O. Blanch, R. K. Bock, A. Boller, G. Bonnoli, D. Borla Tridon, T. BretzA. Cañellas, E. Carmona, A. Carosi, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, L. Cossio, S. Covino, P. Da Vela, F. Dazzi, A. De Angelis, G. De Caneva, E. De Cea Del Pozo, B. De Lotto, C. Delgado Mendez, A. Diago Ortega, M. Doert, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, D. Eisenacher, D. Elsaesser, D. Ferenc, M. V. Fonseca, L. Font, C. Fruck, R. J.García López, M. Garczarczyk, D. Garrido, G. Giavitto, N. Godinović, S. R. Gozzini, D. Hadasch, D. Häfner, A. Herrero, D. Hildebrand, D. Höhne-Mönch, J. Hose, D. Hrupec, B. Huber, T. Jogler, V. Kadenius, H. Kellermann, S. Klepser, T. Krähenbühl, J. Krause, A. La Barbera, D. Lelas, E. Leonardo, N. Lewandowska, E. Lindfors, S. Lombardi, M. López, R. López-Coto, A. López-Oramas, E. Lorenz, M. Makariev, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, J. M. Miranda, R. Mirzoyan, J. Moldón, A. Moralejo, P. Munar-Adrover, A. Niedzwiecki, D. Nieto, K. Nilsson, N. Nowak, R. Orito, S. Paiano, D. Paneque, R. Paoletti

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Abstract

We report on the detection of very-high energy (VHE, E > 100 GeV) γ-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been detected by the MAGIC telescopes with a statistical significance of 6.6σ above 100 GeV in 46 h of stereo observations carried out between August 2010 and February 2011. The measured differential energy spectrum between 70 GeV and 500 GeV can be described by a power law with a steep spectral index of Γ =-4.1 ± 0.7 stat ± 0.3syst, and the average flux above 100 GeV is Fγ = (1.3 ± 0.2stat ± 0.3 syst) × 10-11 cm-2 s-1. These results, combined with the power-law spectrum measured in the first two years of observations by the Fermi-LAT above 100 MeV, with a spectral index of Γ ≈-2.1, strongly suggest the presence of a break or cut-off around tens of GeV in the NGC 1275 spectrum. The light curve of the source above 100 GeV does not show hints of variability on a month time scale. Finally, we report on the nondetection in the present data of the radio galaxy IC 310, previously discovered by the Fermi-LAT and MAGIC. The derived flux upper limit F U.L.γ (>300 GeV) = 1.2 × 10-12 cm-2 s-1 is a factor ∼ 3 lower than the mean flux measured by MAGIC between October 2009 and February 2010, thus confirming the year time-scale variability of the source at VHE. © 2012 ESO.

Original language	English
Article number	L2
Journal	Astronomy and Astrophysics
Volume	539
DOIs	https://doi.org/10.1051/0004-6361/201118668
Publication status	Published - 27 Feb 2012

Keywords

galaxies: active
galaxies: individual: IC310
galaxies: individual: NGC 1275
galaxies: jets
gamma rays: galaxies

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10.1051/0004-6361/201118668

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Aleksić, J., Alvarez, E. A., Antonelli, L. A., Antoranz, P., Asensio, M., Backes, M., Barres De Almeida, U., Barrio, J. A., Bastieri, D., Becerra González, J., Bednarek, W., Berger, K., Bernardini, E., Biland, A., Blanch, O., Bock, R. K., Boller, A., Bonnoli, G., Borla Tridon, D., ... Paoletti, R. (2012). Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes. Astronomy and Astrophysics, 539, Article L2. https://doi.org/10.1051/0004-6361/201118668

@article{8a56b055a3ee444a929744bbee22651a,

title = "Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes",

abstract = "We report on the detection of very-high energy (VHE, E > 100 GeV) γ-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been detected by the MAGIC telescopes with a statistical significance of 6.6σ above 100 GeV in 46 h of stereo observations carried out between August 2010 and February 2011. The measured differential energy spectrum between 70 GeV and 500 GeV can be described by a power law with a steep spectral index of Γ =-4.1 ± 0.7 stat ± 0.3syst, and the average flux above 100 GeV is Fγ = (1.3 ± 0.2stat ± 0.3 syst) × 10-11 cm-2 s-1. These results, combined with the power-law spectrum measured in the first two years of observations by the Fermi-LAT above 100 MeV, with a spectral index of Γ ≈-2.1, strongly suggest the presence of a break or cut-off around tens of GeV in the NGC 1275 spectrum. The light curve of the source above 100 GeV does not show hints of variability on a month time scale. Finally, we report on the nondetection in the present data of the radio galaxy IC 310, previously discovered by the Fermi-LAT and MAGIC. The derived flux upper limit F U.L.γ (>300 GeV) = 1.2 × 10-12 cm-2 s-1 is a factor ∼ 3 lower than the mean flux measured by MAGIC between October 2009 and February 2010, thus confirming the year time-scale variability of the source at VHE. {\textcopyright} 2012 ESO.",

keywords = "galaxies: active, galaxies: individual: IC310, galaxies: individual: NGC 1275, galaxies: jets, gamma rays: galaxies",

author = "J. Aleksi{\'c} and Alvarez, {E. A.} and Antonelli, {L. A.} and P. Antoranz and M. Asensio and M. Backes and {Barres De Almeida}, U. and Barrio, {J. A.} and D. Bastieri and {Becerra Gonz{\'a}lez}, J. and W. Bednarek and K. Berger and E. Bernardini and A. Biland and O. Blanch and Bock, {R. K.} and A. Boller and G. Bonnoli and {Borla Tridon}, D. and T. Bretz and A. Ca{\~n}ellas and E. Carmona and A. Carosi and P. Colin and E. Colombo and Contreras, {J. L.} and J. Cortina and L. Cossio and S. Covino and {Da Vela}, P. and F. Dazzi and {De Angelis}, A. and {De Caneva}, G. and {De Cea Del Pozo}, E. and {De Lotto}, B. and {Delgado Mendez}, C. and {Diago Ortega}, A. and M. Doert and A. Dom{\'i}nguez and {Dominis Prester}, D. and D. Dorner and M. Doro and D. Eisenacher and D. Elsaesser and D. Ferenc and Fonseca, {M. V.} and L. Font and C. Fruck and L{\'o}pez, {R. J.Garc{\'i}a} and M. Garczarczyk and D. Garrido and G. Giavitto and N. Godinovi{\'c} and Gozzini, {S. R.} and D. Hadasch and D. H{\"a}fner and A. Herrero and D. Hildebrand and D. H{\"o}hne-M{\"o}nch and J. Hose and D. Hrupec and B. Huber and T. Jogler and V. Kadenius and H. Kellermann and S. Klepser and T. Kr{\"a}henb{\"u}hl and J. Krause and {La Barbera}, A. and D. Lelas and E. Leonardo and N. Lewandowska and E. Lindfors and S. Lombardi and M. L{\'o}pez and R. L{\'o}pez-Coto and A. L{\'o}pez-Oramas and E. Lorenz and M. Makariev and G. Maneva and N. Mankuzhiyil and K. Mannheim and L. Maraschi and M. Mariotti and M. Mart{\'i}nez and D. Mazin and M. Meucci and Miranda, {J. M.} and R. Mirzoyan and J. Mold{\'o}n and A. Moralejo and P. Munar-Adrover and A. Niedzwiecki and D. Nieto and K. Nilsson and N. Nowak and R. Orito and S. Paiano and D. Paneque and R. Paoletti",

year = "2012",

month = feb,

day = "27",

doi = "10.1051/0004-6361/201118668",

language = "English",

volume = "539",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Aleksić, J, Alvarez, EA, Antonelli, LA, Antoranz, P, Asensio, M, Backes, M, Barres De Almeida, U, Barrio, JA, Bastieri, D, Becerra González, J, Bednarek, W, Berger, K, Bernardini, E, Biland, A, Blanch, O, Bock, RK, Boller, A, Bonnoli, G, Borla Tridon, D, Bretz, T, Cañellas, A, Carmona, E, Carosi, A, Colin, P, Colombo, E, Contreras, JL, Cortina, J, Cossio, L, Covino, S, Da Vela, P, Dazzi, F, De Angelis, A, De Caneva, G, De Cea Del Pozo, E, De Lotto, B, Delgado Mendez, C, Diago Ortega, A, Doert, M, Domínguez, A, Dominis Prester, D, Dorner, D, Doro, M, Eisenacher, D, Elsaesser, D, Ferenc, D, Fonseca, MV, Font, L, Fruck, C, López, RJG, Garczarczyk, M, Garrido, D, Giavitto, G, Godinović, N, Gozzini, SR, Hadasch, D, Häfner, D, Herrero, A, Hildebrand, D, Höhne-Mönch, D, Hose, J, Hrupec, D, Huber, B, Jogler, T, Kadenius, V, Kellermann, H, Klepser, S, Krähenbühl, T, Krause, J, La Barbera, A, Lelas, D, Leonardo, E, Lewandowska, N, Lindfors, E, Lombardi, S, López, M, López-Coto, R, López-Oramas, A, Lorenz, E, Makariev, M, Maneva, G, Mankuzhiyil, N, Mannheim, K, Maraschi, L, Mariotti, M, Martínez, M, Mazin, D, Meucci, M, Miranda, JM, Mirzoyan, R, Moldón, J, Moralejo, A, Munar-Adrover, P, Niedzwiecki, A, Nieto, D, Nilsson, K, Nowak, N, Orito, R, Paiano, S, Paneque, D & Paoletti, R 2012, 'Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes', Astronomy and Astrophysics, vol. 539, L2. https://doi.org/10.1051/0004-6361/201118668

TY - JOUR

T1 - Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes

AU - Aleksić, J.

AU - Alvarez, E. A.

AU - Antonelli, L. A.

AU - Antoranz, P.

AU - Asensio, M.

AU - Backes, M.

AU - Barres De Almeida, U.

AU - Barrio, J. A.

AU - Bastieri, D.

AU - Becerra González, J.

AU - Bednarek, W.

AU - Berger, K.

AU - Bernardini, E.

AU - Biland, A.

AU - Blanch, O.

AU - Bock, R. K.

AU - Boller, A.

AU - Bonnoli, G.

AU - Borla Tridon, D.

AU - Bretz, T.

AU - Cañellas, A.

AU - Carmona, E.

AU - Carosi, A.

AU - Colin, P.

AU - Colombo, E.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Cossio, L.

AU - Covino, S.

AU - Da Vela, P.

AU - Dazzi, F.

AU - De Angelis, A.

AU - De Caneva, G.

AU - De Cea Del Pozo, E.

AU - De Lotto, B.

AU - Delgado Mendez, C.

AU - Diago Ortega, A.

AU - Doert, M.

AU - Domínguez, A.

AU - Dominis Prester, D.

AU - Dorner, D.

AU - Doro, M.

AU - Eisenacher, D.

AU - Elsaesser, D.

AU - Ferenc, D.

AU - Fonseca, M. V.

AU - Font, L.

AU - Fruck, C.

AU - López, R. J.García

AU - Garczarczyk, M.

AU - Garrido, D.

AU - Giavitto, G.

AU - Godinović, N.

AU - Gozzini, S. R.

AU - Hadasch, D.

AU - Häfner, D.

AU - Herrero, A.

AU - Hildebrand, D.

AU - Höhne-Mönch, D.

AU - Hose, J.

AU - Hrupec, D.

AU - Huber, B.

AU - Jogler, T.

AU - Kadenius, V.

AU - Kellermann, H.

AU - Klepser, S.

AU - Krähenbühl, T.

AU - Krause, J.

AU - La Barbera, A.

AU - Lelas, D.

AU - Leonardo, E.

AU - Lewandowska, N.

AU - Lindfors, E.

AU - Lombardi, S.

AU - López, M.

AU - López-Coto, R.

AU - López-Oramas, A.

AU - Lorenz, E.

AU - Makariev, M.

AU - Maneva, G.

AU - Mankuzhiyil, N.

AU - Mannheim, K.

AU - Maraschi, L.

AU - Mariotti, M.

AU - Martínez, M.

AU - Mazin, D.

AU - Meucci, M.

AU - Miranda, J. M.

AU - Mirzoyan, R.

AU - Moldón, J.

AU - Moralejo, A.

AU - Munar-Adrover, P.

AU - Niedzwiecki, A.

AU - Nieto, D.

AU - Nilsson, K.

AU - Nowak, N.

AU - Orito, R.

AU - Paiano, S.

AU - Paneque, D.

AU - Paoletti, R.

PY - 2012/2/27

Y1 - 2012/2/27

N2 - We report on the detection of very-high energy (VHE, E > 100 GeV) γ-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been detected by the MAGIC telescopes with a statistical significance of 6.6σ above 100 GeV in 46 h of stereo observations carried out between August 2010 and February 2011. The measured differential energy spectrum between 70 GeV and 500 GeV can be described by a power law with a steep spectral index of Γ =-4.1 ± 0.7 stat ± 0.3syst, and the average flux above 100 GeV is Fγ = (1.3 ± 0.2stat ± 0.3 syst) × 10-11 cm-2 s-1. These results, combined with the power-law spectrum measured in the first two years of observations by the Fermi-LAT above 100 MeV, with a spectral index of Γ ≈-2.1, strongly suggest the presence of a break or cut-off around tens of GeV in the NGC 1275 spectrum. The light curve of the source above 100 GeV does not show hints of variability on a month time scale. Finally, we report on the nondetection in the present data of the radio galaxy IC 310, previously discovered by the Fermi-LAT and MAGIC. The derived flux upper limit F U.L.γ (>300 GeV) = 1.2 × 10-12 cm-2 s-1 is a factor ∼ 3 lower than the mean flux measured by MAGIC between October 2009 and February 2010, thus confirming the year time-scale variability of the source at VHE. © 2012 ESO.

AB - We report on the detection of very-high energy (VHE, E > 100 GeV) γ-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been detected by the MAGIC telescopes with a statistical significance of 6.6σ above 100 GeV in 46 h of stereo observations carried out between August 2010 and February 2011. The measured differential energy spectrum between 70 GeV and 500 GeV can be described by a power law with a steep spectral index of Γ =-4.1 ± 0.7 stat ± 0.3syst, and the average flux above 100 GeV is Fγ = (1.3 ± 0.2stat ± 0.3 syst) × 10-11 cm-2 s-1. These results, combined with the power-law spectrum measured in the first two years of observations by the Fermi-LAT above 100 MeV, with a spectral index of Γ ≈-2.1, strongly suggest the presence of a break or cut-off around tens of GeV in the NGC 1275 spectrum. The light curve of the source above 100 GeV does not show hints of variability on a month time scale. Finally, we report on the nondetection in the present data of the radio galaxy IC 310, previously discovered by the Fermi-LAT and MAGIC. The derived flux upper limit F U.L.γ (>300 GeV) = 1.2 × 10-12 cm-2 s-1 is a factor ∼ 3 lower than the mean flux measured by MAGIC between October 2009 and February 2010, thus confirming the year time-scale variability of the source at VHE. © 2012 ESO.

KW - galaxies: active

KW - galaxies: individual: IC310

KW - galaxies: individual: NGC 1275

KW - galaxies: jets

KW - gamma rays: galaxies

U2 - 10.1051/0004-6361/201118668

DO - 10.1051/0004-6361/201118668

M3 - Article

SN - 0004-6361

VL - 539

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L2

ER -

Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes

Abstract

Keywords

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