dc.contributor |
Universitat de Barcelona |
dc.contributor.author |
Paredes i Poy, Josep Maria |
dc.contributor.author |
Ishwara-Chandra, C. H. |
dc.contributor.author |
Bosch i Ramon, Valentí |
dc.contributor.author |
Zabalza de Torres, Víctor |
dc.contributor.author |
Iwasawa, Kazushi |
dc.contributor.author |
Ribó Gomis, Marc |
dc.date |
2014-02-17T08:04:30Z |
dc.date |
2014-02-17T08:04:30Z |
dc.date |
2014-01 |
dc.date |
2014-02-17T08:04:30Z |
dc.identifier.citation |
0004-6361 |
dc.identifier.citation |
633607 |
dc.identifier.uri |
http://hdl.handle.net/2445/49965 |
dc.format |
8 p. |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
Springer Verlag |
dc.relation |
Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201322306 |
dc.relation |
Astronomy and Astrophysics, 2014, vol. 561, num. A56, p. 1-8 |
dc.relation |
http://dx.doi.org/10.1051/0004-6361/201322306 |
dc.relation |
info:eu-repo/grantAgreement/EC/FP7/321520/EU//ASTFLOW |
dc.rights |
(c) Springer Verlag, 2014 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Raigs gamma |
dc.subject |
Púlsars |
dc.subject |
Supernoves |
dc.subject |
Radioastronomia |
dc.subject |
Formació d'estels |
dc.subject |
Astrofísica |
dc.subject |
Interferòmetres |
dc.subject |
Gamma rays |
dc.subject |
Pulsars |
dc.subject |
Supernovae |
dc.subject |
Radio astronomy |
dc.subject |
Star formation |
dc.subject |
Astrophysics |
dc.subject |
Interferometers |
dc.title |
Deep GMRT radio observations and a multi-wavelength study of the region around HESS J1858+020 |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/acceptedVersion |
dc.description.abstract |
Context. There are a number of very high energy sources in the Galaxy that remain unidentified. Multi-wavelength and variability studies, and catalogue searches, are powerful tools to identify the physical counterpart, given the uncertainty in the source location and extension. Aims. This work carries out a thorough multi-wavelength study of the unidentified, very high energy source HESS J1858+020 and its environs. Methods. We have performed Giant Metrewave Radio Telescope observations at 610 MHz and 1.4 GHz to obtain a deep, low-frequency radio image of the region surrounding HESS J1858+020. We analysed archival radio, infrared, and X-ray data as well. This observational information, combined with molecular data, catalogue sources, and a nearby Fermi gamma-ray detection of unidentified origin, are combined to explore possible counterparts to the very high energy source. Results. We provide with a deep radio image of a supernova remnant that might be related to the GeV and TeV emission in the region. We confirm the presence of an H ii region next to the supernova remnant and coincident with molecular emission. A potential region of star formation is also identified. We identify several radio and X-ray sources in the surroundings. Some of these sources are known planetary nebulae, whereas others may be non-thermal extended emitters and embedded young stellar objects. Three old, background Galactic pulsars also neighbour HESS J1858+020 along the line of sight. Conclusions. The region surrounding HESS J1858+020 is rich in molecular structures and non-thermal objects that may potentially be linked to this unidentified very high energy source. In particular, a supernova remnant interacting with nearby molecular clouds may be a good candidate, but a star forming region, or a non-thermal radio source of yet unclear nature, may also be behind the gamma-ray source. The neighbouring pulsars, despite being old and distant, cannot be discarded as candidates. Further observational studies are needed, however, to narrow the search for a counterpart to the HESS source. |