Publication: Discovery of very high energy gamma-rays from the blazar S5 0716+714
Loading...
Official URL
Full text at PDC
Publication Date
2009-10-20
Authors
Fonseca González, Mª Victoria
Nieto, Daniel
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Citations
Exportar
Abstract
The MAGIC Collaboration reports the detection of the blazar S5 0716+714 (z = 0.31 +/- 0.08) in very high energy gamma rays. The observations were performed in 2007 November and in 2008 April, and were triggered by the Kungliga Vetenskapliga Akademi telescope due to the high optical state of the object. An overall significance of the signal accounts to S = 5.8 sigma for 13.1 hr of data. Most of the signal (S = 6.9 sigma) comes from the 2008 April data sample during a higher optical state of the object suggesting a possible correlation between the Very High Energy gamma-ray and optical emissions. The differential energy spectrum of the 2008 data sample follows a power law with a photon index of G = 3.45 +/- 0.54(stat) +/- 0.2(syst), and the integral flux above 400 GeV is at the level of (7.5 +/- 2.2(stat) +/- 2.3(syst)) x 10(-12) cm(-2) s(-1), corresponding to a 9% Crab Nebula flux. Modeling of the broadband spectral energy distribution indicates that a structured jet model appears to be more promising in describing the available data than a simple one-zone synchrotron self-Compton model.
Description
© The American Astronomical Society. 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. The authors also thank the anonymous referee for the valuable comments and suggestions, which helped to improve the Letter.
UCM subjects
Unesco subjects
Keywords
Citation
Abdo, A., et al. (The Fermi LAT Collaboration) 2009, ApJ, 700, 597.
Aharonian, F., et al. (The HEGRA Collaboration) 2004, A&A, 421, 529.
Albert, J., et al. (The MAGIC Collaboration) 2006, ApJ, 648, L105.
Albert, J., et al. (The MAGIC Collaboration) 2007a, ApJ, 667, L21.
Albert, J., et al. (The MAGIC Collaboration) 2007b, ApJ, 666, L17.
Albert, J., et al. (The MAGIC Collaboration) 2007c, Nucl. Instrum. Methods A, 583, 494.
Albert, J., et al. (The MAGIC Collaboration) 2008a, ApJ, 674, 1037.
Albert, J., et al. (The MAGIC Collaboration) 2008b, Nucl. Instrum. Methods A, 594, 407.
Albert, J., et al. (The MAGIC Collaboration) 2008c, Nucl. Instrum. Methods A, 588, 424.
Aliu, E., et al. (The MAGIC Collaboration) 2009, Astropart. Phys., 30, 293.
Bloom, S. D., Marscher, A. P. 1996, ApJ, 461, 657.
Chen, A. W., et al. 2008, A&A, 489, 37.
Daum, A., et al. (The HEGRA Collaboration) 1997, Astropart. Phys., 8, 1.
Dermer, C. D., Schlickeiser, R. 1993, ApJ, 416, 458.
Franceschini, A., Rodighiero, G., Vaccari, M. 2008, A&A, 487, 837.
Giommi, P., et al. 2008a, A&A, 487, 49.
Giommi, P., et al. 2008b, ATel 1495.
Ghisellini, G., Tavecchio, F., Chiaberge, M. 2005, A&A, 432, 401.
Gould, R. J., Schr´eder, G. P. 1967, Phys. Rev., 155, 1408.
Hartman, R. C., et al. 1999, ApJS, 123, 79.
No. 2, 2009 DISCOVERY OF VERY HIGH ENERGY γ -RAYS FROM S5 0716+714 L133.
Larionov, V., et al. 2008, ATel, 1502.
Li, T.-P., Ma, Y.-Q. 1983, ApJ, 272, 317.
Mannheim, K. 1993, A&A, 269, 67.
Maraschi, L., Ghisellini, G., Celotti, A. 1992, ApJ, 397, L5.
Marscher, A. P., et al. 2008, Nature, 452, 966.
Mazin, D., Goebel, F. 2007, ApJ, 655, L13.
Mücke, A., et al. 2003, Astropart. Phys., 18, 593.
Nieppola, E., Tornikoski, M., Valtaoja, E. 2006, A&A, 445, 441.
Nilsson, K., et al. 2008, A&A, 487, L29.
Padovani, P. 2007, Ap&SS, 309, 63.
Padovani, P., Giommi, P. 1995, MNRAS, 277, 1477.
Stickel, M., Fried, J. W., Kuehr, H. 1993, A&AS, 98, 393.
Takalo, L. O., et al. 2007, in ASP Conf. Ser. 373, The Central Engine of Active Galactic Nuclei, ed. Luis C. Ho & Jian-MinWang (San Francisco, CA: ASP), 249.
Tavecchio, F., Ghisellini, G. 2009, MNRAS, 394, 131.
Tavecchio, F., et al. 2001, ApJ, 554, 725.
Teshima, M. (for the MAGIC Collaboration) 2008, ATel, 1500.
Villata, M., et al. 2008, A&A, 480, 339.
Wagner, S. J., et al. 1996, AJ, 111, 2187.