MAGIC TeV Gamma-Ray Observations of Markarian 421 during Multiwavelength Campaigns in 2006
Abstract
The Major Atmospheric Gamma Imaging Cerenkov (MAGIC) telescope participated in three multiwavelength (MWL) campaigns, observing the blazar Markarian (Mkn) 421 during the nights of 2006 April 28, 29, and 2006 June 14. We analyzed the corresponding MAGIC very-high energy observations during 9 nights from 2006 April 22 to 30 and on 2006 June 14. We inferred light curves with sub-day resolution and night-by-night energy spectra. 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)10^-10 cm^-2 s^-1 (0.57 Crab units) and (3.21+-0.15)10^-10 cm^-2 s^-1 (2.0 Crab units) in 2006 April. There is a clear indication for intra-night variability with a doubling time of 36+-10(stat) minutes on the night of 2006 April 29, 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.
Keywords
Cite
@article{arxiv.1001.1291,
title = {MAGIC TeV Gamma-Ray Observations of Markarian 421 during Multiwavelength Campaigns in 2006},
author = {MAGIC Collaboration and J. Aleksić and L. A. Antonelli and P. Antoranz and M. Backes and C. Baixeras and S. Balestra and J. A. Barrio and D. Bastieri and J. Becerra González and W. Bednarek and A. Berdyugin and K. Berger and E. Bernardini and A. Biland and R. K. Bock and G. Bonnoli and P. Bordas and D. Borla Tridon and V. Bosch-Ramon and D. Bose and I. Braun and T. Bretz and D. Britzger and M. Camara and E. Carmona and A. Carosi and P. Colin and S. Commichau and J. L. Contreras and J. Cortina and M. T. Costado and S. Covino and F. Dazzi and A. De Angelis and E. De Cea del Pozo and C. Delgado Mendez and R. De los Reyes and B. De Lotto and M. De Maria and F. De Sabata and M. Doert and A. Domínguez and D. Dominis Prester and D. Dorner and M. Doro and D. Elsaesser and M. Errando and D. Ferenc and M. V. Fonseca and L. Font and R. J. García López and M. Garczarczyk and M. Gaug and N. Godinovic and D. Hadasch and A. Herrero and D. Hildebrand and D. Höhne-Mönch and J. Hose and D. Hrupec and C. C. Hsu and T. Jogler and S. Klepser and T. Krähenbühl and D. Kranich and A. La Barbera and A. Laille and E. Leonardo and E. Lindfors and S. Lombardi and F. Longo and M. López and E. Lorenz and P. Majumdar and G. Maneva and N. Mankuzhiyil and K. Mannheim and L. Maraschi and M. Mariotti and M. Martínez and D. Mazin and M. Meucci and J. M. Miranda and R. Mirzoyan and H. Miyamoto and J. Moldón and M. Moles and A. Moralejo and D. Nieto and K. Nilsson and J. Ninkovic and R. Orito and I. Oya and S. Paiano and R. Paoletti and J. M. Paredes and S. Partini and M. Pasanen and D. Pascoli and F. Pauss and R. G. Pegna and M. A. Perez-Torres and M. Persic and L. Peruzzo and F. Prada and E. Prandini and N. Puchades and I. Puljak and I. Reichardt and W. Rhode and M. Ribó and J. Rico and M. Rissi and S. Rügamer and A. Saggion and T. Y. Saito and M. Salvati and M. Sánchez-Conde and K. Satalecka and V. Scalzotto and V. Scapin and C. Schultz and T. Schweizer and M. Shayduk and S. N. Shore and A. Sierpowska-Bartosik and A. Sillanpää and J. Sitarek and D. Sobczynska and F. Spanier and S. Spiro and A. Stamerra and B. Steinke and J. C. Struebig and T. Suric and L. Takalo and F. Tavecchio and P. Temnikov and T. Terzic and D. Tescaro and M. Teshima and D. F. Torres and H. Vankov and R. M. Wagner and V. Zabalza and F. Zandanel and R. Zanin},
journal= {arXiv preprint arXiv:1001.1291},
year = {2014}
}
Comments
11 pages, 7 figures, accepted for publication by Astron. Astrophys