[PMI2009] GMRT J201948.1+370645 , the SIMBAD biblio

2009A&A...507..241P - Astronomy and Astrophysics, volume 507, 241-250 (2009/11-3)

Radio continuum and near-infrared study of the MGRO J2019+37 region.

PAREDES J.M., MARTI J., ISHWARA-CHANDRA C.H., SANCHEZ-SUTIL J.R., MUNOZ-ARJONILLA A.J., MOLDON J., PERACAULA M., LUQUE-ESCAMILLA P.L., ZABALZA V., BOSCH-RAMON V., BORDAS P., ROMERO G.E. and RIBO M.

Abstract (from CDS):

object{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. We surveyed a region of about 6 square degrees with the Giant Metrewave Radio Telescope (GMRT) at the frequency 610MHz. We also observed the central square degree of this survey in the near-infrared Ks-band using the 3.5m 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. 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 ∼3x105 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. 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.

Abstract Copyright:

Journal keyword(s): gamma rays: observations - HII regions - infrared: stars - radio continuum: stars - X-rays: binaries

VizieR on-line data: <Available at CDS (J/A+A/507/241): table2.dat>

Nomenclature: Table 2: [PMI2009] {GMRT} JHHMMSS.s+DDMMSS N=362. Fig. 3, Text: [PMI2009] A (Nos A-B). Text: [PMI2009] JHHMMSS.ss+DDMMSS.s N=2.

Simbad objects: 29

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