2009A&A...507..241P

Query : 2009A&A...507..241P

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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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2820 2
2 M 1 SNR 05 34 30.9 +22 00 53           ~ 6199 1
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4349 2
4 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 674 1
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14448 0
6 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 573 2
7 [PMI2009] GMRT J201830.6+370225 Rad 18 30 38.40 +37 02 25.6           ~ 1 0
8 [PMI2009] GMRT J201832.4+370234 Rad 18 32 25.80 +37 02 34.5           ~ 1 0
9 [PMI2009] GMRT J201947.4+370634 Rad 19 47 28.20 +37 06 34.3           ~ 1 0
10 [PMI2009] GMRT J201948.1+370645 Rad 19 48 07.20 +37 06 45.6           ~ 1 0
11 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 299 2
12 UCAC2 44720820 * 20 17 41.8434115632 +36 45 26.438614452           ~ 3 0
13 2RXP J201742.3+364513 X 20 17 42.0 +36 45 13           ~ 1 0
14 [PMI2009] GMRT J201744.8+365045 Rad 20 17 44.82 +36 50 45.2           ~ 2 0
15 SH 2-104 HII 20 17 52.5 +36 49 24           ~ 97 0
16 [PMI2009] A Rad 20 18 32 +37 02.5           ~ 1 0
17 [PMI2009] J201947.74+370640.2 ? 20 19 47.74 +37 06 40.2           ~ 1 0
18 [PMI2009] J201947.86+370639.9 ? 20 19 47.86 +37 06 39.9           ~ 1 0
19 [PMI2009] B Rad 20 19 48 +37 06.7           ~ 1 0
20 MGRO J2019+37 gam 20 20.1 +36 43           ~ 63 0
21 4C 36.39 Rad 20 20 33.0 +36 31 58           ~ 13 1
22 PSR J2021+3651 Psr 20 21 05.40 +36 51 04.5           ~ 191 1
23 Cl Berkeley 87 OpC 20 21 35.0 +37 25 59           ~ 132 0
24 GRO J2021+37 gam 20 22 37.2 +37 16 53           ~ 94 2
25 NAME Cyg X BL? 20 30 04.7973633 +40 51 36.002197           ~ 848 1
26 TeV J2032+4130 gam 20 31.7 +41 31           ~ 136 0
27 NAME Cyg Complex reg 20 32 +45.0           ~ 602 0
28 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 945 0
29 ICRF J205252.0+363535 Sy2 20 52 52.05501061 +36 35 35.3005698   22.083   21.200   ~ 106 1

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