dc.contributor.author |
Paredes i Poy, Josep Maria |
dc.contributor.author |
Martí Ribas, Josep |
dc.contributor.author |
Ishwara-Chandra, C-H. |
dc.contributor.author |
Sánchez-Sutil, J.R. |
dc.contributor.author |
Muñoz-Arjonilla, A.J. |
dc.contributor.author |
Moldón, J. |
dc.contributor.author |
Peracaula i Bosch, Marta |
dc.contributor.author |
Luque-Escamilla, P.L. |
dc.contributor.author |
Zabalza, V. |
dc.contributor.author |
Bosch-Ramon, V. |
dc.contributor.author |
Bordas, P. |
dc.contributor.author |
Romero, G.E. |
dc.contributor.author |
Ribó i Panosa, Marc |
dc.date |
2009 |
dc.identifier.citation |
0004-6361 (versió paper) |
dc.identifier.citation |
1432-0746 (versió electrònica) |
dc.identifier.citation |
http://dx.doi.org/10.1051/0004-6361/200912448 |
dc.identifier.uri |
http://hdl.handle.net/10256/8505 |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
EDP Sciences |
dc.relation |
Reproducció digital del document publicat a: http://dx.doi.org/10.1051/0004-6361/200912448 |
dc.relation |
© Astronomy & Astrophysics, 2009, vol.507, núm. 1, p. 241-250 |
dc.relation |
Articles publicats (IIIA) |
dc.rights |
Tots els drets reservats |
dc.subject |
Raigs gamma |
dc.subject |
Gamma rays |
dc.subject |
Estels binaris de raigs X |
dc.subject |
X-rays double stars |
dc.subject |
Radioastronomia |
dc.subject |
Radio astronomy |
dc.title |
Radio continuum and near-ingrared study of the MGRO J2019+37 region |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/publishedVersion |
dc.description.abstract |
Context. MGRO J2019+37 is an unidentified extended source of very high energy gamma-rays originally reported by the Milagro Collaboration as the brightest TeV source in the Cygnus region. Its extended emission could be powered by either a single or several sources. The GeV pulsar AGL J2020.5+3653, discovered by AGILE and associated with PSR J2021+3651, could contribute to the emission from MGRO J2019+37. Our aim is to identify radio and near-infrared sources in the field of the extended TeV source MGRO J2019+37, and study potential counterparts to explain its emission. Methods: We surveyed a region of about 6 square degrees with the Giant Metrewave Radio Telescope (GMRT) at the frequency 610 MHz. We also observed the central square degree of this survey in the near-infrared Ks-band using the 3.5 m telescope in Calar Alto. Archival X-ray observations of some specific fields are included. VLBI observations of an interesting radio source were performed. We explored possible scenarios to produce the multi-TeV emission from MGRO J2019+37 and studied which of the sources could be the main particle accelerator. Results: We present a catalogue of 362 radio sources detected with the GMRT in the field of MGRO J2019+37, and the results of a cross-correlation of this catalog with one obtained at near-infrared wavelengths, which contains ∼3 × 105 sources, as well as with available X-ray observations of the region. Some peculiar sources inside the ∼1◦ uncertainty region of the TeV emission from MGRO J2019+37 are discussed in detail, including the pulsar PSR J2021+3651 and its pulsar wind nebula PWN G75.2+0.1, two new radio-jet sources, the Hii region Sh 2-104 containing two star clusters, and the radio source NVSS J202032+363158. We also find that the hadronic scenario is the most likely in case of a single accelerator, and discuss the possible contribution from the sources mentioned above. Conclusions: Although the radio and GeV pulsar PSR J2021+3651 / AGL J2020.5+3653 and its associated pulsar wind nebula PWN G75.2+0.1 can contribute to the emission from MGRO J2019+37, extrapolation of the GeV spectrum does not explain the detected multi-TeV flux. Other sources discussed here could contribute to the emission of the Milagro source |