dc.contributor |
Universitat de Barcelona |
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 Vara, Francisco Javier |
dc.contributor.author |
Peracaula i Bosch, Marta |
dc.contributor.author |
Luque Escamilla, Pedro L. |
dc.contributor.author |
Zabalza de Torres, Víctor |
dc.contributor.author |
Bosch i Ramon, Valentí |
dc.contributor.author |
Bordas Coma, Pol |
dc.contributor.author |
Romero, Gustavo E. |
dc.contributor.author |
Ribó Gomis, Marc |
dc.date |
2013-06-21T12:05:18Z |
dc.date |
2013-06-21T12:05:18Z |
dc.date |
2009 |
dc.date |
2013-06-21T12:05:19Z |
dc.identifier.citation |
0004-6361 |
dc.identifier.citation |
577982 |
dc.identifier.uri |
http://hdl.handle.net/2445/44387 |
dc.format |
18 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/10.1051/0004-6361/200912448 |
dc.relation |
Astronomy and Astrophysics, 2009, vol. 507, num. 1, p. 241-250 |
dc.relation |
http://dx.doi.org/10.1051/0004-6361/200912448 |
dc.rights |
(c) Springer Verlag, 2009 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Raigs gamma |
dc.subject |
Estels |
dc.subject |
Radiació |
dc.subject |
Raigs X |
dc.subject |
Gamma rays |
dc.subject |
Stars |
dc.subject |
Radiation |
dc.subject |
X-rays |
dc.title |
Radio continuum and near-infrared study of the MGRO J2019+37 region |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/acceptedVersion |
dc.description.abstract |
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 . Aims. 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 -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 ~3105 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 H II 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. |