Bibcode
Aleksić, J.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Berger, K.; Bernardini, E.; Biland, A.; Blanch, O.; Bock, R. K.; Boller, A.; Bonnefoy, S.; Bonnoli, G.; Borla Tridon, D.; Borracci, F.; Bretz, T.; Carmona, E.; Carosi, A.; Carreto Fidalgo, D.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Cossio, L.; Covino, S.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; Delgado Mendez, C.; De Lotto, B.; Doert, M.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Eisenacher, D.; Elsaesser, D.; Farina, E.; Ferenc, D.; Fonseca, M. V.; Font, L.; Fruck, C.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Giavitto, G.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Hadamek, A.; Hadasch, D.; Häfner, D.; Herrero, A.; Hose, J.; Hrupec, D.; Idec, W.; Kadenius, V.; Knoetig, M. L.; Krähenbühl, T.; Krause, J.; Kushida, J.; La Barbera, A.; Lelas, D.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; López-Coto, R.; López, M.; López-Oramas, A.; Lorenz, E.; Lozano, I.; Makariev, M.; Mallot, K.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, M.; Martínez, M.; Masbou, J.; Mazin, D.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Moldón, J.; Moralejo, A.; Munar-Adrover, P.; Nakajima, D.; Niedzwiecki, A.; Nilsson, K.; Nowak, N.; Orito, R.; Overkemping, A.; Paiano, S. et al.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 563, id.A91, 9 pp.
Fecha de publicación:
3
2014
Revista
Número de citas
66
Número de citas referidas
44
Descripción
Context. The radio galaxy IC 310 has recently been identified as a
γ-ray emitter based on observations at GeV energies with Fermi-LAT
and at very high energies (VHE, E > 100 GeV) with the MAGIC
telescopes. Originally classified as a head-tail radio galaxy, the
nature of this object is subject of controversy since its nucleus shows
blazar-like behavior. Aims: To understand the nature of IC 310
and the origin of the VHE emission, we studied the spectral and flux
variability of IC 310 from the X-ray band to the VHE γ-ray regime.
Methods: The light curve of IC 310 above 300 GeV has been
measured with the MAGIC telescopes from 2009 October to 2010 February.
Contemporaneous Fermi-LAT data (2008-2011) in the 10-500 GeV energy
range were also analyzed. In the X-ray regime, archival observations
from 2003 to 2007 with XMM-Newton, Chandra, and Swift-XRT in the 0.5-10
keV band were studied. Results: The VHE light curve reveals
several high-amplitude and short-duration flares. Day-to-day flux
variability is clearly present (>5σ). The photon index between
120 GeV and 8 TeV remains at the value Γ ~ 2.0 during both low and
high flux states. The VHE spectral shape does not show significant
variability, whereas the flux at 1 TeV changes by a factor of ~7.
Fermi-LAT detected only eight γ-ray events in the energy range 10
GeV-500 GeV in three years of observation. The measured photon index of
Γ = 1.3 ± 0.5 in the Fermi-LAT range is very hard. The
X-ray measurements show strong variability in both flux and photon
index. The latter varied from 1.76 ± 0.07 to 2.55 ± 0.07.
Conclusions: The rapid variability measured in γ-rays and
X-rays confirms the blazar-like behavior of IC 310. The multi-TeV
γ-ray emission seems to originate from scales of less than 80
Schwarzschild radii (for a black hole mass of 2 × 108
M⊙) within the compact core of its FR I radio jet with
orientation angle 10°-38°. The spectral energy distribution
resembles that of an extreme blazar, albeit the luminosity is more than
two orders of magnitude lower.
Proyectos relacionados
![Telescopio MAGIC Project Image](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/Imagen%20RGL.png?h=a38a7f06&itok=UgLTRZyC)
Astrofísica de Partículas
El Grupo de Astrofísica de Partículas del IAC participa activamente en tres grandes colaboraciones internacionales de astrofísica de muy altas energías: AMS (Alpha Magnetic Spectrometer), los telescopios de radiación Cherenkov MAGIC I y II, y el Cherenkov Telescope Array (CTA). AMS es un detector de partículas diseñado para operar en el espacio, a
Ramón
García López