2014A&A...561A..56P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.17CEST12:58:35

2014A&A...561A..56P - Astronomy and Astrophysics, volume 561A, 56-56 (2014/1-1)

Deep GMRT radio observations and a multi-wavelength study of the region around HESS J1858+020.

PAREDES J.M., ISHWARA-CHANDRA C.H., BOSCH-RAMON V., ZABALZA V., IWASAWA K. and RIBO M.

Abstract (from CDS):

There are a number of very high energy sources in the Galaxy that remain unidentified. Multi-wavelength and variability studies, and catalogue searches, are powerful tools to identify the physical counterpart, given the uncertainty in the source location and extension. This work carries out a thorough multi-wavelength study of the unidentified, very high energy source HESS J1858+020 and its environs. We have performed Giant Metrewave Radio Telescope observations at 610 MHz and 1.4 GHz to obtain a deep, low-frequency radio image of the region surrounding HESS J1858+020. We analysed archival radio, infrared, and X-ray data as well. This observational information, combined with molecular data, catalogue sources, and a nearby Fermi gamma-ray detection of unidentified origin, are combined to explore possible counterparts to the very high energy source. We provide with a deep radio image of a supernova remnant that might be related to the GeV and TeV emission in the region. We confirm the presence of an HII region next to the supernova remnant and coincident with molecular emission. A potential region of star formation is also identified. We identify several radio and X-ray sources in the surroundings. Some of these sources are known planetary nebulae, whereas others may be non-thermal extended emitters and embedded young stellar objects. Three old, background Galactic pulsars also neighbour HESS J1858+020 along the line of sight. The region surrounding HESS J1858+020 is rich in molecular structures and non-thermal objects that may potentially be linked to this unidentified very high energy source. In particular, a supernova remnant interacting with nearby molecular clouds may be a good candidate, but a star forming region, or a non-thermal radio source of yet unclear nature, may also be behind the gamma-ray source. The neighbouring pulsars, despite being old and distant, cannot be discarded as candidates. Further observational studies are needed, however, to narrow the search for a counterpart to the HESS source.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - radio continuum: general - gamma rays: general - ISM: supernova remnants

Nomenclature: Figs 1-2, Table 2: [PIB2014] RN (Nos R1-R5). Fig. 2, Table 3: [PIB2014] XN (Nos X1-X7).

Simbad objects: 32

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Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2577 2
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3857 2
3 HESS J1427-608 gam 14 27 52.0 -60 51 00           ~ 21 1
4 SNR G353.6-00.7 SNR 17 31 55.0 -34 42 36           ~ 105 0
5 PMN J1822-0939 Rad 18 22 28.70 -09 38 57.0           ~ 32 1
6 ARGO J1839-0627 Psr 18 40 55.0 -05 33 00           ~ 47 1
7 4FGL J1857.7+0246e Psr 18 57 11.0 +02 40 00           ~ 38 0
8 [PIB2014] R1 Rad 18 57 37.117 +02 12 32.33           ~ 1 0
9 EGR J1856+0235 gam 18 57 37.16 +02 12 33.6           ~ 25 0
10 IRAS 18551+0159 PN? 18 57 37.70616 +02 03 39.6540           ~ 15 0
11 PSR B1855+02.1 Psr 18 57 40.90 +02 10 58.0           ~ 8 0
12 PSR B1855+02 Psr 18 57 43.6600 +02 12 41.100           ~ 49 0
13 SNR G035.6-00.4 Rad 18 57 55 +02 13.0           ~ 37 1
14 PN G035.5-00.4 PN? 18 57 59.5 +02 07 07           ~ 18 1
15 [PIB2014] X1 X 18 58 00.46 +02 09 23.3           ~ 1 0
16 [PIB2014] X2 X 18 58 06.49 +02 07 47.7           ~ 1 0
17 [PIB2014] X3 X 18 58 08.97 +02 06 51.2           ~ 1 0
18 [PIB2014] X4 X 18 58 10.71 +02 07 30.1           ~ 1 0
19 [PG2010] G035.60-00.53 MoC 18 58.2 +02 08           ~ 2 0
20 2MASS J18581239+0216513 NIR 18 58 12.399 +02 16 51.37           ~ 1 0
21 [PIB2014] R4 Rad 18 58 12.557 +02 16 52.94           ~ 1 0
22 2MASS J18581274+0216523 NIR 18 58 12.748 +02 16 52.38           ~ 1 0
23 [PIB2014] R5 Rad 18 58 13.898 +02 14 52.05           ~ 1 0
24 [PG2010] Molecular Cloud MoC 18 58.3 +02 07           ~ 2 0
25 PSR J1858+0215 Psr 18 58 17.43 +02 15 38.0           ~ 7 0
26 HESS J1858+020 gam 18 58 20.0 +02 05 24           ~ 37 0
27 [PG2010] G035.58-00.58 MoC 18 58.3 +02 06           ~ 2 0
28 2MASS J18582116+0205098 NIR 18 58 21.163 +02 05 09.88           ~ 2 0
29 2MASS J18582214+0205010 NIR 18 58 22.147 +02 05 01.02           ~ 2 0
30 [PIB2014] X5 X 18 58 22.2190656600 +02 04 54.566423222           ~ 1 0
31 [PIB2014] X6 * 18 58 37.3930263552 +01 58 51.821311151           ~ 1 0
32 [PIB2014] X7 X 18 58 38.50 +01 58 33.2           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2021.04.17-12:58:35

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