2012MNRAS.422.2429A

Query : 2012MNRAS.422.2429A

2012MNRAS.422.2429A - Mon. Not. R. Astron. Soc., 422, 2429-2443 (2012/May-3)

A derivation of the free-free emission on the Galactic plane between l= 20° and 44°.

ALVES M.I.R., DAVIES R.D., DICKINSON C., CALABRETTA M., DAVIS R. and STAVELEY-SMITH L.

Abstract (from CDS):

We present the derivation of the free-free emission on the Galactic plane between l= 20° and 44° and|b| ≤ 4°, using radio recombination line (RRL) data from the H I Parkes All Sky Survey (HIPASS). Following an upgrade of the RRL data reduction technique, which improves significantly the quality of the final RRL spectra, we have extended the analysis to three times the area covered in [Alves et al.] The final RRL map has an angular resolution of 14.8 arcmin and a velocity resolution of 20 km/s.

The electron temperature (Te) distribution of the ionized gas in the area under study at 1.4 GHz is derived using the line and continuum data from the present survey. The mean Te on the Galactic plane is 6000 K. The first direct measure of the free-free emission is obtained based on the derived Tedistribution. Subtraction of this thermal component from the total continuum leads to the first direct measurement of the synchrotron emission at 1.4 GHz. A narrow component of width 2° is identified in the latitude distribution of the synchrotron emission. We present a list of H II regions and supernova remnants (SNRs) extracted from the present free-free and synchrotron maps, where we confirm the synchrotron nature of the SNRs G42.0-0.1 and G41.5+0.4 proposed by [Kaplan et al.] and the SNR G35.6-0.4 recently re-identified by [Green].

The latitude distribution for the RRL-derived free-free emission shows that the Wilkinson Microwave Anisotropy Probe (WMAP) maximum entropy method is too high by ∼50 per cent, in agreement with other recent results. The extension of this study to the inner Galaxy region l=-50° to 50° will allow a better overall comparison of the RRL result with WMAP.


Abstract Copyright: 2012 The Authors. Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): radiation mechanisms: general - methods: data analysis - H {sc ii} regions - ISM: lines and bands - Galaxy: structure - radio lines: ISM

Nomenclature: Table 2: [ADD2012] HII NN (Nos 1-48). Table 4: [ADD2012] SNR NN (Nos 1-26).

Simbad objects: 85

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Number of rows : 85
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 Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14400 0
2 [ADD2012] SNR 1 SNR 18 28.2 -11 38           ~ 1 0
3 GRS G020.70 -00.10 Rad 18 29 13 -10 52.9           ~ 3 0
4 Kes 68 HII 18 29 15 -10 52.8           ~ 3 0
5 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 230 2
6 RCW 168 HII 18 31.5 -09 59           ~ 2 0
7 [ADD2012] HII 4 HII 18 32.1 -09 22           ~ 1 0
8 [ADD2012] HII 3 HII 18 32.3 -09 36           ~ 1 0
9 SNR G021.8-00.6 SNR 18 32 45 -10 08.0           ~ 129 0
10 [ADD2012] SNR 4 SNR 18 33.4 -09 14           ~ 1 0
11 [ADD2012] SNR 2 SNR 18 33.5 -10 34           ~ 1 0
12 [ADD2012] HII 7 HII 18 33.5 -08 11           ~ 1 0
13 [ADD2012] SNR 6 SNR 18 33.9 -07 09           ~ 1 0
14 [ADD2012] HII 5 HII 18 34.3 -09 03           ~ 1 0
15 [ADD2012] HII 6 HII 18 34.6 -08 32           ~ 1 0
16 SNR G023.3-00.3 SNR 18 34 51.80 -08 44 38.2           ~ 218 0
17 [ADD2012] HII 9 HII 18 35.5 -07 21           ~ 1 0
18 [ADD2012] HII 8 HII 18 36.6 -07 32           ~ 1 0
19 GRS G025.80 +00.20 Rad 18 37 34 -06 16.6           ~ 3 0
20 [ADD2012] HII 11 HII 18 37.8 -06 18           ~ 1 0
21 V* EW Sct cC* 18 37 51.1112159832 -06 47 48.494842332   9.50 7.96     F8Ib/II 110 0
22 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 113 0
23 [ADD2012] SNR 7 SNR 18 38.9 -07 37           ~ 1 0
24 [ADD2012] HII 12 HII 18 39.2 -06 05           ~ 1 0
25 [ADD2012] SNR 9 SNR 18 39.8 -04 20           ~ 1 0
26 [ADD2012] HII 13 HII 18 40.5 -05 39           ~ 1 0
27 3C 387 HII 18 40.8 -05 07           ~ 8 0
28 4C -04.71 Rad 18 41 19.8 -04 56 06           ~ 326 3
29 [ADD2012] HII 16 HII 18 42.8 -04 14           ~ 1 0
30 [ADD2012] HII 17 HII 18 43.2 -03 39           ~ 1 0
31 [ADD2012] SNR 10 SNR 18 43.7 -03 52           ~ 1 0
32 [ADD2012] HII 19 HII 18 44.4 -03 17           ~ 1 0
33 [ADD2012] HII 20 HII 18 46.1 -02 42           ~ 1 0
34 SNR G029.7-00.2 SNR 18 46 22.8 -02 59 47           ~ 349 2
35 [ADD2012] HII 21 HII 18 47.3 -02 27           ~ 1 0
36 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 531 0
37 Kes 76 HII 18 47 37 -01 56.7           ~ 5 0
38 3C 391.0 BL? 18 49 16.3 -00 55 01           ~ 352 2
39 [ADD2012] HII 24 HII 18 49.6 -01 23           ~ 1 0
40 [ADD2012] HII 26 HII 18 49.7 -00 38           ~ 1 0
41 [ADD2012] HII 23 HII 18 50.3 -02 11           ~ 1 0
42 [ADD2012] HII 27 HII 18 50.7 -00 43           ~ 1 0
43 [ADD2012] HII 25 HII 18 50.9 -01 04           ~ 1 0
44 4C -00.73 Rad 18 51 46.9 -00 03 19           ~ 100 1
45 SNR G033.6+00.1 SNR 18 52 29.000 +00 38 42.00           ~ 285 1
46 [ADD2012] HII 29 HII 18 52.8 +00 32           ~ 1 0
47 [ADD2012] SNR 24 SNR 18 53.8 +00 01           ~ 1 0
48 [ADD2012] HII 32 HII 18 55.0 +01 44           ~ 1 0
49 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 964 2
50 [ADD2012] HII 34 HII 18 56.3 +02 22           ~ 1 0
51 CTB 61 HII 18 56.4 +07 55           ~ 10 0
52 [ADD2012] SNR 16 SNR 18 57.9 +02 10           ~ 1 0
53 SNR G035.6-00.4 Rad 18 57 55 +02 13.0           ~ 47 1
54 [ADD2012] HII 31 HII 18 58.1 +00 56           ~ 1 0
55 [ADD2012] HII 37 HII 18 59.3 +03 28           ~ 1 0
56 [ADD2012] HII 35 HII 18 59.3 +02 03           ~ 1 0
57 NAME Sgr Arm PoG 19 00 -30.0           ~ 637 1
58 [ADD2012] HII 38 HII 19 00.0 +04 09           ~ 1 0
59 CTB 64 Rad 19 00 59 +04 14.2           ~ 42 0
60 [ADD2012] SNR 25 SNR 19 01.1 +02 54           ~ 1 0
61 [ADD2012] HII 39 HII 19 01.3 +04 15           ~ 1 0
62 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 153 0
63 [ADD2012] HII 40 HII 19 01.6 +04 39           ~ 1 0
64 RCW 179 HII 19 03.7 +02 13           ~ 7 0
65 NRAO 591 HII 19 03.8 +05 39           ~ 16 0
66 SNR G039.2-00.3 SNR 19 04 03.9 +05 26 56           ~ 192 1
67 [ADD2012] SNR 21 SNR 19 05.7 +07 45           ~ 1 0
68 SNR G041.5+00.4 SNR 19 05 48 +07 46.1           ~ 17 0
69 [ADD2012] SNR 26 SNR 19 06.0 +10 33           ~ 1 0
70 [ADD2012] HII 45 HII 19 07.0 +07 47           ~ 1 0
71 [ADD2012] HII 44 HII 19 07.1 +07 10           ~ 1 0
72 [ADD2012] SNR 19 SNR 19 07.1 +06 36           ~ 1 0
73 SNR G041.1-00.3 SNR 19 07 22.6 +07 10 44           ~ 228 2
74 SNR G042.0-00.1 SNR 19 08 11 +08 00.5           ~ 14 0
75 LBN 039.95-01.44 HII 19 08 31.0 +05 35 50   13.70 12.39     ~ 33 0
76 [ADD2012] SNR 22 SNR 19 09.1 +08 04           ~ 1 0
77 [ADD2012] HII 42 HII 19 09.3 +05 39           ~ 1 0
78 [ADD2012] HII 47 HII 19 09.8 +08 27           ~ 1 0
79 W 49a BL? 19 10 15.7 +09 06 05           ~ 306 2
80 [ADD2012] HII 46 HII 19 10.3 +07 51           ~ 1 0
81 W 49b SNR 19 11 09.000 +09 06 24.00           ~ 463 1
82 SNR G039.7-02.0 SNR 19 12 20 +04 55.0           ~ 353 1
83 4C 04.71 Rad 20 44 45.3 +04 44 05           ~ 11 1
84 NAME Local Arm reg ~ ~           ~ 537 0
85 NAME Scutum Spiral Arm PoG ~ ~           ~ 351 0

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