2016A&A...588A..97B


Query : 2016A&A...588A..97B

2016A&A...588A..97B - Astronomy and Astrophysics, volume 588A, 97-97 (2016/4-1)

Continuum sources from the THOR survey between 1 and 2 GHz.

BIHR S., JOHNSTON K.G., BEUTHER H., ANDERSON L.D., OTT J., RUGEL M., BIGIEL F., BRUNTHALER A., GLOVER S.C.O., HENNING T., HEYER M.H., KLESSEN R.S., LINZ H., LONGMORE S.N., McCLURE-GRIFFITHS N.M., MENTEN K.M., PLUME R., SCHIERHUBER T., SHANAHAN R., STIL J.M., URQUHART J.S. and WALSH A.J.

Abstract (from CDS):

We carried out a large program with the Karl G. Jansky Very Large Array (VLA): "THOR: The HI, OH, Recombination line survey of the Milky Way". We observed a significant portion (∼100deg2) of the Galactic plane in the first quadrant of the Milky Way in the 21cm HI line, 4 OH transitions, 19 radio recombination lines, and continuum from 1 to 2GHz. In this paper we present a catalog of the continuum sources in the first half of the survey (l=14.0-37.9° and l=47.1-51.2°, |b|<=1.1°) at a spatial resolution of 10-25'', depending on the frequency and sky position with a spatially varying noise level of ∼0.3-1mJy/beam. The catalog contains ∼4400 sources. Around 1200 of these are spatially resolved, and ∼1000 are possible artifacts, given their low signal-to-noise ratios. Since the spatial distribution of the unresolved objects is evenly distributed and not confined to the Galactic plane, most of them are extragalactic. Thanks to the broad bandwidth of the observations from 1 to 2GHz, we are able to determine a reliable spectral index for ∼1800 sources. The spectral index distribution reveals a double-peaked profile with maxima at spectral indices of α≃-1 and α≃0, corresponding to steep declining and flat spectra, respectively. This allows us to distinguish between thermal and non-thermal emission, which can be used to determine the nature of each source. We examine the spectral index of ∼300 known HII regions, for which we find thermal emission with spectral indices around α≃0. In contrast, supernova remnants (SNR) show non-thermal emission with α≃-0.5 and extragalactic objects generally have a steeper spectral index of α≃-1. Using the spectral index information of the THOR survey, we investigate potential SNR candidates. We classify the radiation of four SNR candidates as non-thermal, and for the first time, we provide strong evidence for the SNR origin of these candidates.

Abstract Copyright: © ESO, 2016

Journal keyword(s): catalogs - surveys - radio continuum: general - techniques: interferometric

VizieR on-line data: <Available at CDS (J/A+A/588/A97): catalog.dat>

Nomenclature: Catalog: [BJB2016] GLLL.lll+BB.bbb N=4420, [BJB2016] G032.875-00.420A (Nos A-B).

Status at CDS : Acronym for new objects described in the dictionary of nomenclature and being created in SIMBAD.

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4118 2
2 SNR G015.9+00.2 SNR 18 18 52 -15 02.0           ~ 90 0
3 SNR G016.7+00.1 Rad 18 20 58.6 -14 20 32           ~ 55 2
4 SNR G017.0-00.0 Rad 18 22.0 -14 08           ~ 15 1
5 PMN J1822-0939 Rad 18 22 28.70 -09 38 57.0           ~ 37 1
6 SNR G017.4-00.1 SNR 18 23.1 -13 46           ~ 17 0
7 SNR G018.8+00.3 SNR 18 24.0 -12 23           ~ 97 0
8 SNR G018.1-00.2 Rad 18 24 37.0 -13 15 18           ~ 40 1
9 SNR G018.6-00.2 SNR 18 25.9 -12 50           ~ 24 0
10 SNR G020.4+00.1 SNR 18 27.8 -11 00           ~ 23 0
11 SNR G020.0-00.2 SNR 18 28 07.000 -11 35 00.00           ~ 58 0
12 SNR G018.9-01.1 SNR 18 29.8 -12 58           ~ 57 0
13 SNR G021.8-00.6 SNR 18 32 45 -10 08.0           ~ 121 0
14 SNR G023.6+00.3 Rad 18 33 03.7 -08 12 30           ~ 41 1
15 SNR G021.6-00.8 SNR 18 33 36 -10 25.4           ~ 15 0
16 SNR G024.7+00.6 SNR 18 34 46 -07 05.8           ~ 84 0
17 SNR G023.3-00.3 SNR 18 34 51.80 -08 44 38.2           ~ 204 0
18 SNR G024.7-00.6 Rad 18 38 43 -07 32.0           ~ 45 1
19 4C -04.71 Rad 18 41 19.8 -04 56 06           ~ 314 3
20 SNR G028.6-00.1 Rad 18 43 55 -03 53.0           ~ 51 1
21 SNR G029.6+00.1 Rad 18 44 52 -02 56.5           ~ 50 1
22 SNR G029.7-00.2 SNR 18 46 25.5 -02 59 14           ~ 321 2
23 3C 391.0 Rad 18 49 23.3 -00 55 38           ~ 338 2
24 SNR G032.5+00.1 SNR 18 50 05.000 -00 25 00.00           ~ 41 1
25 4C -00.73 Rad 18 51 25 -00 08.0           ~ 89 1
26 SNR G033.6+00.1 SNR 18 52 29.000 +00 38 42.00           ~ 268 1
27 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 914 2
28 SNR G035.6-00.4 Rad 18 57 55 +02 13.0           ~ 41 1
29 W 51 SNR 19 23 50 +14 06.0           ~ 1223 1
30 ICRF J192559.6+210626 BLL 19 25 59.60535560 +21 06 26.1620442           ~ 188 1

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2022.10.02-23:40:30

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