Speakers
Dr
Pierre Colin
(Max-Planck-Institut für Physik, D-80805 München, Germany)Dr
Roberta Zanin
(Universitat de Barcelona (ICC, IEEC-UB), E-08028 Barcelona, Spain)
Description
The W44 region includes the supernova remnant SNR G34.7-0.4 and two additional surrounding GeV sources, revealed with Fermi Large Area Telescope (LAT); the whole system is embedded in the giant molecular cloud G34.8-0.6.
In the hypothesis that hadrons are accelerated at the SNR shock, the geometry of the system suggests a possible signature of their diffusion and interaction with the cloud away from the acceleration site, resulting in gamma-ray emission offset from the radio SNR shell.
In order to test the diffusion scenario, the GeV source with the harder spectrum (W44 SRC1) has been observed in very-high energy gamma rays with the MAGIC Telescopes.
No significant very-high energy signal has been found from W44 SRC1 in about 100 hours of data. Upper limits on the integral flux of this region have been computed at energies above 50 GeV. The source extension will be derived by the GeV emission provided by Fermi-LAT.
The surrounding molecular cloud has been studied based on HI and CO maps provided by the NANTEN collaboration.
We used these data to constrain the cosmic ray diffusion coefficient in the region.
| Registration number following "ICRC2015-I/" | 206 |
|---|---|
| Collaboration | -- not specified -- |
Authors
Prof.
Diego Torres
(Institut de Ciències de l'Espai (IEEC-CSIC), E-08193 Bellaterra, Spain)
Dr
Emma de Oña Wilhelmi
(Institut de Ciències de l'Espai (IEEC-CSIC), E-08193 Bellaterra, Spain)
Dr
Giovanna Pedaletti
(Deutsches Elektronen-Synchrotron (DESY), D-15738 Zeuthen, Germany)
Dr
Julian Krause
(Max-Planck-Institut für Physik, D-80805 München, Germany)
Dr
Pierre Colin
(Max-Planck-Institut für Physik, D-80805 München, Germany)
Dr
Roberta Zanin
(Universitat de Barcelona (ICC, IEEC-UB), E-08028 Barcelona, Spain)
Dr
Sara Rebecca Gozzini
(Deutsches Elektronen-Synchrotron (DESY), D-15738 Zeuthen, Germany)
Dr
Yoshitaka Hanabata
(Institute for Cosmic-Ray Research, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan)
Co-authors
Di Venere Leonardo
(Dip. Interateneo di Fisica "M. Merlin" Via Amendola 173 70126 Bari)
Dr
Giordano Francesco
(Dip. Interateneo di Fisica "M. Merlin" Via Amendola 173 70126 Bari)
Dr
Sano Hidetoshi
(Department of Physics and Astrophysics, Nagoya University, Nagoya, Aichi 464-8602, Japan)
Prof.
Yasuo Fukui
(Department of Physics and Astrophysics, Nagoya University, Nagoya, Aichi 464-8602, Japan)
Dr
Yoshiike Satoshi
(Department of Physics and Astrophysics, Nagoya University, Nagoya, Aichi 464-8602, Japan)
