Bibcode
MAGIC Collaboration; Aleksić, J.; Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Bangale, P.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Biland, A.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Bretz, T.; Carmona, E.; Carosi, A.; Carreto Fidalgo, D.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Lotto, B.; Delgado Mendez, C.; Doert, M.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Eisenacher, D.; Elsaesser, D.; Farina, E.; Ferenc, D.; Fonseca, M. V.; Font, L.; Frantzen, K.; Fruck, C.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Hadasch, D.; Hayashida, M.; Herrera, J.; Herrero, A.; Hildebrand, D.; Hose, J.; Hrupec, D.; Idec, W.; Kadenius, V.; Kellermann, H.; Klepser, S.; Kodani, K.; Konno, Y.; Krause, J.; Kubo, H.; Kushida, J.; La Barbera, A.; Lelas, D.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; López, M.; López-Coto, R.; 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.; Mazin, D.; Menzel, U.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Munar-Adrover, P.; Nakajima, D.; Niedzwiecki, A.; Nilsson, K.; Nishijima, K.; Noda, K. et al.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 571, id.A96, 8 pp.
Fecha de publicación:
11
2014
Revista
Número de citas
16
Número de citas referidas
15
Descripción
Aims: HESS J1857+026 is an extended TeV gamma-ray source that was
discovered by H.E.S.S. as part of its Galactic plane survey. Given its
broadband spectral energy distribution and its spatial coincidence with
the young energetic pulsar PSR J1856+0245, the source has been put
forward as a pulsar wind nebula (PWN) candidate. MAGIC has performed
follow-up observations aimed at mapping the source down to energies
approaching 100 GeV in order to better understand its complex
morphology. Methods: HESS J1857+026 was observed by MAGIC in
2010, yielding 29 h of good quality stereoscopic data that allowed us to
map the source region in two separate ranges of energy. Results:
We detected very-high-energy gamma-ray emission from HESS J1857+026 with
a significance of 12σ above 150 GeV. The differential energy
spectrum between 100 GeV and 13 TeV is described well by a power law
function dN/dE = N0(E/1TeV)-Γ with
N0 = (5.37 ± 0.44stat ±
1.5sys) × 10-12 (TeV-1
cm-2 s-1) and Γ = 2.16 ±
0.07stat ± 0.15sys, which bridges the gap
between the GeV emission measured by Fermi-LAT and the multi-TeV
emission measured by H.E.S.S.. In addition, we present a detailed
analysis of the energy-dependent morphology of this region. We couple
these results with archival multiwavelength data and outline evidence in
favor of a two-source scenario, whereby one source is associated with a
PWN, while the other could be linked with a molecular cloud complex
containing an Hii region and a possible gas cavity.
Proyectos relacionados
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