Observations of Markarian 421 with the MAGIC Telescope
Copyright policy )Observations of Markarian 421 with the MAGIC Telescope
The MAGIC telescope took data of very high energy gamma-ray emission from the blazar Markarian 421 ( Mrk 421) between 2004 November and 2005 April. We present a combined analysis of data samples recorded under different observational conditions, down to gamma- ray energies of 100 GeV. The flux was found to vary between 0.5 and 2 crab ( integrated above 200 GeV), considered a low state when compared to known data. Although the flux varied day by day, no short-term variability was observed, although there is some indication that not all nights show an equally quiescent state. The results at higher energies were found to be consistent with previous observations. A clear correlation is observed between gamma-ray and X-ray fluxes, whereas no significant correlation between gamma-ray and optical data is seen. The spectral energy distribution between 100 GeVand 3 TeV shows a clear deviation from a power law, more clearly and at lower flux than previous observations at higher energies. The deviation persists after correcting for the effect of attenuation by the extragalactic background light, and most likely is source- inherent. There is a rather clear indication of an inverse Compton peak around 100 GeV. The spectral energy distribution of Mrk 421 can be fitted by a one-zone synchrotron self-Compton model, suggesting once again a leptonic origin of the very high energy gamma-ray emission from this blazar.
- ETH Zurich Switzerland
- KU Leuven Belgium
- University of Padua Italy
- University of Trieste Italy
- Humboldt-Universität zu Berlin Germany
Active Galaxy Markarian-421, Gamma-Rays., Electrónica (Física), 2202.03 Electricidad, ACTIVE GALAXY MARKARIAN-421, BL Lacertae objects : individual (Markarian 421), gamma rays : observations, SPITZER-SPACE-TELESCOPE, 0306 Physical Chemistry (incl. Structural), 8000 ANGSTROM, Spitzer-Space-Telescope, Physical Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Cobe Dirbe Maps, Electrónica, Física nuclear, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421; Gamma Rays: Observations, Diffuse Infrared Light, Gamma Rays: Observations, Electricidad, TEV BLAZAR MARKARIAN-421, 5101 Astronomical sciences, 1ST Detections, 539.1, EXTRAGALACTIC BACKGROUND LIGHT; ACTIVE GALAXY MARKARIAN-421; TEV BLAZAR MARKARIAN-421; SPITZER-SPACE-TELESCOPE; DIFFUSE INFRARED LIGHT; HIGH-ENERGY PHOTONS; COBE DIRBE MAPS; BL-LAC OBJECTS; 1ST DETECTIONS; GAMMA-RAYS, Astronomy & Astrophysics, gamma ray astronomy; Cosmic rays; IMAGING CHERENKOV DETECTOR, 5109 Space sciences, Extragalactic Background Light, BL-LAC Objects, BL-LAC OBJECTS, TEV Blazar Markarian-421, 5107 Particle and high energy physics, 537, 0201 Astronomical and Space Sciences, DIFFUSE INFRARED LIGHT, COBE DIRBE MAPS, MULTIWAVELENGTH OBSERVATIONS, Science & Technology, GAMMA-RAYS, 2207 Física Atómica y Nuclear, HIGH-ENERGY PHOTONS, EXTRAGALACTIC BACKGROUND LIGHT, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421, X-RAY, High-Energy Photons, SOURCE COUNTS, 1ST DETECTIONS
Active Galaxy Markarian-421, Gamma-Rays., Electrónica (Física), 2202.03 Electricidad, ACTIVE GALAXY MARKARIAN-421, BL Lacertae objects : individual (Markarian 421), gamma rays : observations, SPITZER-SPACE-TELESCOPE, 0306 Physical Chemistry (incl. Structural), 8000 ANGSTROM, Spitzer-Space-Telescope, Physical Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Cobe Dirbe Maps, Electrónica, Física nuclear, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421; Gamma Rays: Observations, Diffuse Infrared Light, Gamma Rays: Observations, Electricidad, TEV BLAZAR MARKARIAN-421, 5101 Astronomical sciences, 1ST Detections, 539.1, EXTRAGALACTIC BACKGROUND LIGHT; ACTIVE GALAXY MARKARIAN-421; TEV BLAZAR MARKARIAN-421; SPITZER-SPACE-TELESCOPE; DIFFUSE INFRARED LIGHT; HIGH-ENERGY PHOTONS; COBE DIRBE MAPS; BL-LAC OBJECTS; 1ST DETECTIONS; GAMMA-RAYS, Astronomy & Astrophysics, gamma ray astronomy; Cosmic rays; IMAGING CHERENKOV DETECTOR, 5109 Space sciences, Extragalactic Background Light, BL-LAC Objects, BL-LAC OBJECTS, TEV Blazar Markarian-421, 5107 Particle and high energy physics, 537, 0201 Astronomical and Space Sciences, DIFFUSE INFRARED LIGHT, COBE DIRBE MAPS, MULTIWAVELENGTH OBSERVATIONS, Science & Technology, GAMMA-RAYS, 2207 Física Atómica y Nuclear, HIGH-ENERGY PHOTONS, EXTRAGALACTIC BACKGROUND LIGHT, Galaxies: BL Lacertae Objects: Individual: Name: Markarian 421, X-RAY, High-Energy Photons, SOURCE COUNTS, 1ST DETECTIONS
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