MAGIC TeV gamma-ray observations of Markarian 421 during multiwavelength campaigns in 2006

Antoranz Canales, Pedro; Barrio Uña, Juan Abel; Contreras González, José Luis; Fonseca González, Mª Victoria; Miranda Pantoja, José Miguel; Nieto, Daniel

MAGIC TeV gamma-ray observations of Markarian 421 during multiwavelength campaigns in 2006

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http://dx.doi.org/10.1051/0004-6361/200913945

Publication date

2010

Authors

Antoranz Canales, Pedro

Barrio Uña, Juan Abel

Contreras González, José Luis

Fonseca González, Mª Victoria

Miranda Pantoja, José Miguel

Nieto, Daniel

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EDP Sciencies

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https://hdl.handle.net/20.500.14352/43919

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Acciari, V. A., Aliu, E., Aune, T., et al. (VERITAS and MAGIC Collabs.) 2009, ApJ, 703, 169. Aharonian, F., Akhperjanian, A., Beilicke, M., et al. (HEGRA Collab.) 2002, A&A, 393, 89. Aharonian, F., Akhperjanian, A., Beilicke, M., et al. (HEGRA Collab.) 2004, ApJ, 614, 897. Aharonian, F., Akhperjanian, A. G., Aye, K.-M., et al. (HESS Collab.) 2005, A&A, 437, 95. Albert, J., Aliu, E., Anderhub, H., et al. (MAGIC Collab.) 2006, ApJ, 638, L101. Albert, J., Aliu, E., Anderhub, H., et al. (MAGIC Collab.) 2007a, ApJ, 663, 125. Albert, J., Aliu, E., Anderhub, H., et al. (MAGIC Collab.) 2007b, Nucl. Instrum. Meth., A583, 494. Albert, J., Aliu, E., Anderhub, H., et al. (MAGIC Collab.) 2008a, ApJ, 674, 1037. Albert, J., Aliu, E., Anderhub, H., et al. (MAGIC Collab.) 2008b, Nucl. Instrum. Meth., A588, 424. Albert, J., Aliu, E., Anderhub, H., et al. (MAGIC Collab.) 2008c, Nucl. Instrum. Meth., A594, 407. Aliu, E., Anderhub, H., Antonelli, L. A., et al. (MAGIC Collab.) 2009, Astropart. Phys., 30, 293. Amati, L., Frontera, F., Tavani, M., et al. 2002, A&A, 390, 81. Baixeras, C., Bastieri, D., Bigongiari, C., et al. (MAGIC Collab.) 2004, Nucl. Instrum. Meth., A518, 188. Bła˙zejowski, H., Blaylock, G., Bond, I. H., et al. 2005, ApJ, 630, 130. Bretz, T., Wagner, R. 2003, in Proc. 28th International Cosmic Ray Conference, Tsukuba, Japan, 5, 2947. Bretz, T., Dorner, D. (MAGIC Collab.) 2008, AIP Conf. Proc., 1085, 664. Cortina, J., Armada, A., Biland, A., et al. (MAGIC Collab.) 2005, in Proc. 29th International Cosmic Ray Conference, Pune, India, 5, 359. Cortina, J., Goebel, F., Schweizer, T. (MAGIC Collab.) 2009, in Proc. 31st International Cosmic Ray Conference, Łódź, Poland, [arXiv:0907.1211]. Costamante, L., Ghisellini, G. 2002, A&A, 384, 56. Daum, A., Hermann, G., Hess, M., et al. (HEGRA Collab.) 1997, Astropart. Phys., 8, 1. Donnarumma, I., Vittorini, V., Vercellone, S., et al. (AGILE Collab., GASPWEBT Collab., MAGIC Collab., VERITAS Collab.) 2009, ApJ, 691, L13. Fegan, D. J. 1997, J. Phys. G, 23, 1013. Fegan, D. J. (VERITAS Collab.) 2008, in Proc. 30th International Cosmic Ray Conference, Merida, Mexico, 3, 901. Fomin, V. P., Stepanian, A. A., Lamb, R. C., et al. 1994, Astropart. Phys., 2, 137. Fossati, G., Buckley, J. H., Bond, I. H., et al. 2008, ApJ, 677, 906. Gaidos, J. A., Akerlof, C. W., Biller, S., et al. 1996, Nature, 383, 319. Goebel, F., Backes, M., Bretz, T., et al. (MAGIC Collab.) 2008a, in Proc. 30th International Cosmic Ray Conference, Merida, Mexico, 3, 1025. Goebel F., Bartko, H., Carmona, E., et al. (MAGIC Collab.) 2008b, in Proc. 30th International Cosmic Ray Conference, Merida, Mexico, 3, 1481. Gould, R. J., Schréder, G. P. 1966, Phys. Rev. Lett., 16, 252. Hauser, M. G., Dwek, E. 2001, ARA&A, 39, 249. Hillas, A. M. 1985, in Proc. 19th International Cosmic Ray Conference, La Jolla, 3, 445. Horan, D., Acciari, V. A., Bradbury, S. M., et al. (Whipple Collab.) 2009, ApJ, 695, 596. Hsu, C.-C., et al. (MAGIC Collab.) 2009, in Proc. 31st International Cosmic Ray Conference, Łód´z, Poland, [arXiv:0907.0893]. Katarzyński, K., Ghisellini, G., Mastichiadis, A., Tavecchio, F., Maraschi, L. 2006, A&A, 453, 47. Knapp, J., Heck, D. 2004, EAS Simulation with CORSIKA: A Users Manual. Kneiske, T. M., Dole, H. 2008, AIP Conf. Proc., 1085, 620. Krennrich, F., Bond, I. H., Bradbury, S. M., et al. 2002, ApJ, 575, L9. Krawczynski, H., Sambruna, R., Kohnle, A., et al. 2001, ApJ, 559, 187. Jansen, B., Lumb, D., Altieri, B., et al. 2001, A&A, 365, 1. Lessard, R.W., Buckley, J. H., Connaughton, V., Le Bohec, S. 2001, Astropart. Phys., 15, 1. Li, T.-P., Ma, Y.-Q. 1983, ApJ, 272, 317. Lichti, G. G., Bottacini, E., Ajello, M., et al. 2008, A&A, 486, 721. Mannheim, K., Westerhoff, S., Meyer, H., Fink, H.-H. 1996, A&A, 315, 77. Majumdar, P., Moralejo, A., Bigongiari, C., Blanch, O., Sobczynska, D. 2005, in Proc. 29th International Cosmic Ray Conference, Pune, India, 5, 203. Marscher, A. P., Gear, W. K. 1985, ApJ, 298, 11. Maraschi, L., Ghisellini, G., Celotti, A. 1992, ApJ, 397, L5. Massaro, E., Perri, M., Giommi, P., Nesci, R. 2004, A&A, 413, 489. Mazin, D., Goebel, F. 2007, ApJ, 655, L13. Mazin, D., Goebel, F., Horns, D., et al. 2005, in Proc. 29th International Cosmic Ray Conference, Pune, India, 4, 331. Meucci, M., Paoletti, R., Cecchi, R., et al. 2007, IEEE Trans. Nucl. Sci., 54, 404. Mitsuda, K., Bautz, M., Inoue, H., et al. 2007, PASJ, 59, S1. Mücke, A., Protheroe, R. J., Engel, R., Rachen, J. P., Stanev, T. 2003, Astropart. Phys., 18, 593. Nikishov, A. I. 1962, Sov. Phys. JETP, 14, 393. Petry, D., Bradbury, S. M., Konopelko, A., et al. 1996, A&A, 311, L13. Primack, J. R., Bullock, J. S., Somerville, R. S. 2005, AIP Conf. Proc., 745, 23. Punch, M., Akerlof, C. W., Cawley, M. F., et al. 1992, Nature, 358, 477. Riegel, B., Bretz, T., Dorner, D., Berger, K., Höhne, D. (MAGIC Collab.) 2005, in Proc. 29th International Cosmic Ray Conference, Pune, India, 5, 215. Sakamoto, T., Barbier, L., Barthelmy, S. D., et al. 2006, ApJ, 636, L73. Schweizer, T.,Wagner, R. M., Lorenz, E. 2008, AIP Conf. Proc., 1085, 455. Steele, D., Carini, M. T., Charlot, P., et al. (VERITAS Collab.) 2008, in Proc. 30th International Cosmic Ray Conference, Merida, Mexico, 3, 989. Tluczykont M., Shayduk, M., Kalekin, O., Bernardini, E. 2007, J. Phys. Conf. Ser., 60, 318. Tonello, N. 2006, Ph.D. Thesis, Technische Universität München, MPP-2006-21. Tramacere, A. 2009, PoS(extremesky2009), 96, 39 [arXiv:1003.5001]. Wagner, R. M. 2008a, MNRAS, 385, 119. Wagner, R. M. 2008b, PoS(BLAZARS2008), 63, 13 [arXiv:0808.2483]. Yadav, K. K., Chandra, P., Tickoo, A. K., et al. (TACTIC Collab.) 2007, Astropart. Phys., 27, 447

Abstract

Context. Wide-range spectral coverage of blazar-type active galactic nuclei is of paramount importance for understanding the particle acceleration mechanisms assumed to take place in their jets. The Major Atmospheric Gamma Imaging Cerenkov (MAGIC) telescope participated in three multiwavelength (MWL) campaigns, observing the blazar Markarian (Mkn) 421 during the nights of April 28 and 29, 2006, and June 14, 2006. Aims. We analyzed the corresponding MAGIC very-high energy observations during 9 nights from April 22 to 30, 2006 and on June 14, 2006. We inferred light curves with sub-day resolution and night-by-night energy spectra. Methods. MAGIC detects gamma-rays by observing extended air showers in the atmosphere. The obtained air-shower images were analyzed using the standard MAGIC analysis chain. Results. A strong gamma-ray signal was detected from Mkn 421 on all observation nights. The flux (E > 250 GeV) varied on night-by-night basis between (0.92 +/- 0.11) x 10(-10) cm(-2) s(-1) (0.57 Crab units) and (3.21 +/- 0.15) x 10(-10) cm(-2) s(-1) (2.0 Crab units) in April 2006. There is a clear indication for intra-night variability with a doubling time of 36 +/- 10(stat) min on the night of April 29, 2006, establishing once more rapid flux variability for this object. For all individual nights gamma-ray spectra could be inferred, with power-law indices ranging from 1.66 to 2.47. We did not find statistically significant correlations between the spectral index and the flux state for individual nights. During the June 2006 campaign, a flux substantially lower than the one measured by the Whipple 10-m telescope four days later was found. Using a log-parabolic power law fit we deduced for some data sets the location of the spectral peak in the very-high energy regime. Our results confirm the indications of rising peak energy with increasing flux, as expected in leptonic acceleration models.

Description

© ESO 2010. We thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The support of the German BMBF and MPG, the Italian INFN and Spanish MICINN is gratefully acknowledged. This work was also supported by ETH Research Grant TH 34/043, by the Polish MNiSzW Grant N N203 390834, and by the YIP of the Helmholtz Gemeinschaft.