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

被引：15

作者：

Paredes, J. M. ^{[1
,2
]}

Marti, J. ^{[3
,4
]}

Ishwara-Chandra, C. H. ^{[5
]}

Sanchez-Sutil, J. R. ^{[4
]}

Munoz-Arjonilla, A. J. ^{[3
,4
]}

Moldon, J. ^{[1
,2
]}

Peracaula, M. ^{[6
]}

Luque-Escamilla, P. L. ^{[4
]}

Zabalza, V. ^{[1
,2
]}

Bosch-Ramon, V. ^{[7
]}

Bordas, P. ^{[1
,2
]}

Romero, G. E. ^{[8
,9
]}

Ribo, M. ^{[1
,2
]}

机构：

[1] Univ Barcelona, Dept Astron & Meteorol, UB IEEC, E-08028 Barcelona, Spain

[2] Univ Barcelona, Inst Ciencies Cosmos ICC, UB IEEC, E-08028 Barcelona, Spain

[3] Univ Jaen, EPS, Dept Fis, Jaen 23071, Spain

[4] Univ Jaen, Grp Invest FQM 322, Jaen 23071, Spain

[5] TIFR, NCRA, Pune 411007, Maharashtra, India

[6] Univ Girona, Inst Informat & Aplicac, Girona, Spain

[7] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[8] Consejo Nacl Invest Cient & Tecn, CCT La Plata, Inst Argentino Radioastron, RA-1894 Buenos Aires, DF, Argentina

[9] UNLP, Fac Ciencias Astron & Geofis, RA-1900 La Plata, Argentina

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 507卷 / 01期

关键词：

gamma rays: observations; HII regions; infrared: stars; radio continuum: stars; X-rays: binaries; X-RAY; PSR J2021+3651; NONTHERMAL EMISSION; GALACTIC PLANE; CATALOG; WIND; MICROQUASARS; DISCOVERY; RADIATION; FIELD;

D O I：

10.1051/0004-6361/200912448

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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. 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 K-s-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 similar to 3 x 10(5) sources, as well as with available X-ray observations of the region. Some peculiar sources inside the similar to 1 degrees 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.

引用

页码：241 / 250

页数：10

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