2017MNRAS.465.3163S

Query : 2017MNRAS.465.3163S

2017MNRAS.465.3163S - Mon. Not. R. Astron. Soc., 465, 3163-3174 (2017/March-1)

Galactic synchrotron emissivity measurements between 250° < l < 355° from the GLEAM survey with the MWA.

SU H., HURLEY-WALKER N., JACKSON C.A., McCLURE-GRIFFITHS N.M., TINGAY S.J., HINDSON L., HANCOCK P., WAYTH R.B., GAENSLER B.M., STAVELEY-SMITH L., MORGAN J., JOHNSTON-HOLLITT M., LENC E., BELL M.E., CALLINGHAM J.R., DWARKANATH K.S., FOR B.-Q., KAPINSKA A.D., McKINLEY B., OFFRINGA A.R., PROCOPIO P., WU C. and ZHENG Q.

Abstract (from CDS):

Synchrotron emission pervades the Galactic plane at low radio frequencies, originating from cosmic ray electrons interacting with the Galactic magnetic field. Using a low-frequency radio telescope, the Murchison Widefield Array (MWA), we measure the free-free absorption of this Galactic synchrotron emission by intervening H II regions along the line of sight. These absorption measurements allow us to calculate the Galactic cosmic ray electron emissivity behind and in front of 47 detected H II regions in the region 250° < l < 355°, |b| < 2°. We find that all average emissivities between the H II regions and the Galactic edge along the line of sight (εb) are in the range of 0.39 ∼ 1.45 K pc–1 with a mean of 0.77 K pc–1 and a variance of 0.14 K pc–1 at 88 MHz. Our best model, the two-circle model, divides the Galactic disc into three regions using two circles centring on the Galactic Centre. It shows a high emissivity region near the Galactic Centre, a low emissivity region near the Galactic edge, and a medium emissivity region between these two regions, contrary to the trend found by previous studies.

Abstract Copyright: ∼

Journal keyword(s): cosmic rays - H II regions - Galaxy: structure - radio continuum: general - radio continuum: general

Errata: erratum vol. 472, p. 828 (2017)

Simbad objects: 55

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Number of rows : 55
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 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1230 2
2 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4483 3
3 [CPA2006] S104 HII 14 56 17.49 -59 55 10.9           ~ 6 0
4 [ABB2014] WISE G317.988-00.754 bub 14 56 18.6 -59 55 19           ~ 4 0
5 [ABB2014] WISE G322.036+00.625 bub 15 18 03.1 -56 42 38           ~ 3 0
6 [ABB2014] WISE G322.220+00.504 bub 15 19 17.3 -56 43 01           ~ 3 0
7 [ABB2014] WISE G326.270+00.783 bub 15 41 54.3 -54 11 29           ~ 5 0
8 [ABB2014] WISE G326.643+00.514 bub 15 45 03.0 -54 08 53           ~ 5 0
9 RCW 97 HII 15 53 05.0 -54 35 24           ~ 157 0
10 GAL 327.99-00.09 bub 15 54 44 -53 48.4           ~ 20 0
11 GRS G328.59 -00.52 bub 15 59 28.4 -53 44 57           ~ 43 1
12 NAME Nor Arm PoG 16 00 -50.0           ~ 430 0
13 GAL 331.36+00.51 bub 16 08 48.1 -51 07 59           ~ 12 0
14 [ABB2014] WISE G333.093+01.966 HII 16 10 35 -48 53.2           ~ 2 0
15 IRAS 16112-4943 HII 16 15 05 -49 50.0           ~ 12 0
16 GAL 332.15-00.45 bub 16 16 40.4 -51 17 31           ~ 17 0
17 GAL 332.66-00.61 bub 16 19 45.3 -51 02 48           ~ 38 0
18 [ABB2014] WISE G332.762-00.595 bub 16 20 04.4 -50 57 29           ~ 4 0
19 [ABB2014] WISE G333.011-00.441 HII 16 20 32 -50 40.8           ~ 2 0
20 GAL 333.6-00.2 HII 16 22 11 -50 05.6           ~ 145 0
21 GAL 338.74+00.64 bub 16 39 22 -45 47.7           ~ 13 0
22 GAL 338.94+00.60 HII 16 40 16 -45 39.2           ~ 14 0
23 [ABB2014] WISE G337.957-00.474 bub 16 41 20.2 -47 05 34           ~ 5 0
24 [ABB2014] WISE G338.934-00.067 HII 16 43 17 -46 05.9           ~ 10 0
25 [ABB2014] WISE G339.109-00.233 bub 16 44 59.7 -46 06 47           ~ 2 0
26 AJG 54 HII 16 45 18.0 -46 09 11           ~ 31 1
27 [ABB2014] WISE G340.216+00.424 bub 16 45 47.2 -44 48 30           ~ 4 0
28 [ABB2014] WISE G341.090-00.017 bub 16 51 00.7 -44 27 37           ~ 4 0
29 GAL 342.30+00.31 bub 16 53 45 -43 19.3           ~ 9 0
30 RCW 110A HII 16 53 52 -45 08.4           ~ 2 0
31 [ABB2014] WISE G340.678-01.049 HII 16 54 02 -45 23.7           ~ 1 0
32 GAL 340.78-01.01 HII 16 54 18 -45 17.5           ~ 8 0
33 [ABB2014] WISE G345.235+01.408 HII 16 59 06 -40 18.2           ~ 2 0
34 GAL 343.49-00.03 bub 16 59 20.8 -42 34 42           ~ 20 0
35 [ABB2014] WISE G345.202+01.027 HII 17 00 37.8 -40 33 42           ~ 5 0
36 GAL 343.93-00.64 bub 17 03 27.0 -42 35 41           ~ 12 0
37 [ABB2014] WISE G345.094-00.779 bub 17 07 44.0 -41 45 31           ~ 6 0
38 IRAS 17059-4132 HII 17 09 31.3 -41 35 56           ~ 28 0
39 [ABB2014] WISE G348.261+00.485 bub 17 12 24.0 -38 27 14           ~ 5 0
40 [ABB2014] WISE G348.691-00.826 bub 17 18 48.8 -38 43 55           ~ 4 0
41 [ABB2014] WISE G350.995+00.654 bub 17 19 44.0 -36 07 56           ~ 6 0
42 BFS 65 HII 17 20 06.9 -38 57 34           ~ 78 0
43 [ABB2014] WISE G351.383+00.737 HII 17 20 25 -35 45.5           ~ 3 0
44 GAL 351.31+00.6 HII 17 20 31 -35 51.6           ~ 46 0
45 NGC 6334 HII 17 20 53 -36 07.9           ~ 682 0
46 [ABB2014] WISE G350.991-00.532 HII 17 24 30 -36 48.1           ~ 1 0
47 [ABB2014] WISE G353.092+00.857 bub 17 24 47.6 -34 16 13           ~ 9 0
48 [ABB2014] WISE G353.038+00.581 bub 17 25 31.2 -34 26 35           ~ 3 0
49 IRAS 17227-3619 bub 17 25 55.5 -36 22 54           ~ 7 0
50 [ABB2014] WISE G353.076+00.287 bub 17 26 49.7 -34 35 33           ~ 9 0
51 GAL 351.69-01.17 HII 17 29 05.1 -36 34 13           ~ 12 0
52 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14407 0
53 NAME Sgr Arm PoG 19 00 -30.0           ~ 637 1
54 NAME McClure-Griffiths arm PoG ~ ~           ~ 2 0
55 NAME Sct-Cen PoG ~ ~           ~ 228 0

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