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.
Bibliographical reference
Astronomy and Astrophysics, Volume 571, id.A96, 8 pp.
Advertised on:
11
2014
Journal
Citations
16
Refereed citations
15
Description
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.
Related projects
Particle Astrophysics
The MAGIC Collaboration is integrated by 20 research institutes and university departments from Armenia, Bulgaria, Finland, Germany, Italy, Poland, Spain, Switzerland and USA. The collaboration comprises two 17m diameter telescopes, located at the Roque de los Muchachos Observatory, designed to measure the Cherenkov radiation associated with
Ramón
García López