2022MNRAS.510...11H

Query : 2022MNRAS.510...11H

2022MNRAS.510...11H - Mon. Not. R. Astron. Soc., 510, 11-31 (2022/February-2)

The role of thermal and non-thermal processes in the ISM of the Magellanic Clouds.

HASSANI H., TABATABAEI F., HUGHES A., CHASTENET J., McLEOD A.F., SCHINNERER E. and NASIRI S.

Abstract (from CDS):

Radio continuum emission is a dust-unbiased tracer of both thermal and non-thermal processes in the interstellar medium. We present new maps of the free-free and synchrotron emission in the Magellanic Clouds (MCs) at 0.166, 1.4, and 4.8 GHz with no prior assumption about the radio non-thermal spectrum. The maps were constructed using a de-reddened H α map as a template for the thermal radio emission, which we subtract from maps of the total radio continuum emission. To de-redden the H α emission, it is important to know the fraction of dust surface density that attenuates the H α emission along the line of sight, fd. This fraction is obtained by comparing the dust opacity obtained through the infrared emission spectrum and the Balmer decrement method. In star-forming regions, the median fd is about 0.1, which is lower than that in diffuse regions by a factor of three. We obtain a global thermal radio fraction, fth, of 30 per cent (35 per cent) in the LMC (SMC) at 1.4 GHz. Furthermore, we present maps of the equipartition magnetic field strength with average values of ≃10.1 µG in the LMC and ≃5.5 µG in the SMC. The magnetic field is proportional to the star-formation rate to the power of 0.24 and 0.20 for the LMC and SMC, respectively. This study shows that non-thermal processes control the interstellar medium in the MCs.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): radio continuum: galaxies - ISM: general - ISM: magnetic fields - radiation mechanisms: thermal - radiation mechanisms: non-thermal - galaxies: irregular

Simbad objects: 114

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Number of rows : 114
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12643 1
2 LHA 115-N 13B Em* 00 45 22.6523355840 -73 22 34.011171444   14.38 14.22 14.83 14.92 ~ 16 0
3 LHA 115-N 13A EB* 00 45 25.8239811792 -73 23 00.691598976   13.88 13.47   14.65 ~ 20 1
4 NGC 249 HII 00 45 30.2 -73 04 47           ~ 34 0
5 NGC 267 HII 00 48 02.6 -73 16 39           ~ 54 0
6 LHA 115-N 19 HII 00 48 06 -73 08.7           ~ 64 0
7 LHA 115-N 26 PN 00 48 08.624 -73 14 54.62 14.70 15.22 14.31   14.57 ~ 57 1
8 LHA 115-N 25 Cl* 00 48 09.12 -73 14 19.1           ~ 39 1
9 LHA 115-N 12 HII 00 48 12 -73 16.2           ~ 33 0
10 DEM S 42 Em* 00 48 18.9 -73 19 43           ~ 28 0
11 LHA 115-N 27 Em* 00 48 24.0 -73 05 50           ~ 61 0
12 LHA 115-N 28 Em* 00 48 34.5 -73 15 40           ~ 13 0
13 LHA 115-N 30 Em* 00 49 01.8 -73 08 24     14.9     ~ 33 0
14 LHA 115-N 36 Em* 00 50 24.8 -72 52 53     14.4     ~ 19 1
15 LHA 115-N 37 EmO 00 50 44.3 -72 46 40           ~ 25 0
16 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11145 1
17 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 240 0
18 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 397 1
19 LHA 115-N 78 HII 01 05 12.8 -72 00 38           ~ 35 1
20 LHA 115-N 80 Em* 01 08 09.9 -71 59 50     14.1     ~ 31 0
21 HD 7113 Em* 01 09 12.94464 -73 11 38.8968     11.7     ~ 122 0
22 NGC 456 HII 01 13 44.4 -73 17 26           ~ 127 0
23 LHA 115-N 84C Em* 01 14 17.17 -73 15 49.4   14.65 14.4     O9V 32 0
24 LHA 115-N 84A Em* 01 14 38.10 -73 18 25.5     12.5     ~ 28 1
25 LHA 115-N 84B Em* 01 14 47.2288663920 -73 19 46.601963652   14.57 14.15 15.33 15.01 ~ 24 0
26 LIN 518 Be* 01 15 45.8836146696 -73 20 40.308740124   15.94 15.78     Be 16 0
27 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5838 1
28 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1342 3
29 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7062 0
30 LHA 120-N 77E HII 04 49 47 -69 12.0           ~ 13 0
31 LHA 120-N 79A EmO 04 51 52.1336653200 -69 23 31.365886992       15.05 14.17 ~ 37 0
32 LHA 120-N 79B EmO 04 51 53.6744720568 -69 23 28.684377312         13.38 ~ 30 0
33 NGC 1714 EmO 04 52 08.4 -66 55 23   11.51 11.61     ~ 84 2
34 NGC 1715 EmO 04 52 11.7 -66 54 29           ~ 25 0
35 LHA 120-N 79E HII 04 52 17.2 -69 20 13           ~ 44 0
36 LHA 120-N 79D HII 04 52 27.1 -69 21 42           ~ 10 0
37 LHA 120-N 81 reg 04 52 56 -69 13.5           ~ 12 1
38 LHA 120-N 83A HII 04 53 59 -69 11.6           ~ 27 1
39 LHA 120-N 83 HII 04 54 15 -69 10.6           ~ 40 0
40 NGC 1760 HII 04 56 20.8 -66 32 13           ~ 30 0
41 LHA 120-N 11 HII 04 56 51.4 -66 24 24           ~ 255 0
42 NGC 1763 As* 04 56 51.5 -66 24 25     9.40     ~ 162 3
43 NGC 1769 As* 04 57 44.5 -66 27 42           ~ 70 2
44 LHA 120-N 11D EmO 04 57.8 -66 28           ~ 18 0
45 NGC 1773 HII 04 58 12.0 -66 21 36           ~ 53 1
46 NGC 1770 HII 04 58 29.7 -68 27 02           ~ 50 1
47 LHA 120-N 23A HII 05 05 00.0 -68 03 33     12.13     ~ 27 1
48 LHA 120-N 103B EmO 05 08 47.8 -68 45 39           ~ 223 1
49 LHA 120-N 103A EmO 05 09 24.0 -68 45 44           ~ 38 1
50 LHA 120-N 105A HII 05 09 34.3 -68 53 45           ~ 57 1
51 LHA 120-N 119 HII 05 18 39.2 -69 13 22           ~ 56 1
52 NGC 1918 SNR 05 19 04.50 -69 38 56.0           ~ 100 0
53 LHA 120-N 120B EmO 05 19 05 -69 38.8           ~ 16 0
54 LHA 120-N 120A EmO 05 19 16 -69 38.2           ~ 22 0
55 LHA 120-N 120C EmO 05 19 22 -69 39.3           ~ 14 0
56 CD-68 294 As* 05 21 58 -67 57.3           ~ 110 0
57 LHA 120-N 44 EmO 05 22 06.9 -67 56 46           ~ 195 1
58 IC 2127 EmO 05 22 12.532 -67 58 31.92     11.60     ~ 98 1
59 LHA 120-N 44I HII 05 22 26.6 -67 54 16   10.45 10.37     ~ 36 2
60 IC 2128 HII 05 23 01.0 -68 02 13     11.10     ~ 41 1
61 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17428 0
62 NGC 1949 Cl* 05 24 58.2 -68 28 41     12.39     ~ 30 1
63 LHA 120-N 51D HII 05 25 17.3 -67 22 47           ~ 114 0
64 LHA 120-N 48B EmO 05 25 42 -66 17.6           ~ 14 0
65 SNR J052559-660453 SNR 05 26 00.4 -66 05 02     12.71     ~ 437 2
66 LHA 120-N 51E HII 05 26 24 -67 37.4           ~ 8 1
67 LHA 120-N 143 HII 05 26 28.6 -69 18 58   11.32 11.52     ~ 23 1
68 NGC 1966 Cl* 05 26 30.4 -68 49 02     11.83     ~ 30 0
69 LHA 120-N 144B EmO 05 26 32 -68 48.8           ~ 12 0
70 LHA 120-N 144 HII 05 26 42.5 -68 49 34           ~ 69 0
71 LHA 120-N 51C EmO 05 27 39 -67 27.3           ~ 14 0
72 LHA 120-N 51A HII 05 27 57 -67 25.4           ~ 25 1
73 LHA 120-N 206A HII 05 31 15.2 -71 03 58           ~ 108 2
74 LHA 120-N 148 HII 05 32 10.9 -68 28 23           ~ 33 0
75 LHA 120-N 55A SFR 05 32 28 -66 28.0           ~ 29 0
76 LHA 120-N 57A HII 05 32 28.2 -67 42 11           ~ 50 1
77 NGC 2020 EmO 05 33 10.6 -67 42 45           ~ 34 0
78 LHA 120-N 154B Rad 05 34 33.1 -69 47 14           ~ 8 0
79 NGC 2029 SNR 05 35 15.5 -67 34 04     12.29     ~ 102 0
80 NGC 2032 HII 05 35 23.5 -67 34 56           ~ 74 1
81 SNR B0535-66.0 SNR 05 35 43.1 -66 01 59           ~ 175 1
82 LHA 120-N 157 HII 05 35 49 -69 12.6           ~ 50 0
83 NGC 2048 EmO 05 35 55 -69 39.0   12.05 12.17     N 26 0
84 NGC 2040 As* 05 36 00.7 -67 34 57     11.47     ~ 55 1
85 LHA 120-N 64A EmO 05 36 58 -66 21.6           ~ 12 0
86 LHA 120-N 64B HII 05 37 00 -66 21.0           ~ 11 0
87 NGC 2060 SNR 05 37 51.4466169456 -69 10 23.947092084   9.69 9.59     ~ 360 2
88 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1189 2
89 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2018 2
90 LHA 120-N 158 HII 05 39 11.220 -69 30 13.65           ~ 87 0
91 NGC 2081 HII 05 39 11.8 -69 30 16           ~ 52 1
92 NGC 2077 Cl* 05 39 34.5 -69 39 19   11.71 11.71     ~ 41 1
93 NGC 2079 Cl* 05 39 39.0 -69 46 24           ~ 64 0
94 NGC 2080 HII 05 39 42.6 -69 38 50           ~ 99 1
95 LHA 120-N 159 HII 05 39 46.650 -69 45 39.94           ~ 276 2
96 LHA 120-N 159C EmO 05 40.0 -69 46   11.42 11.35     ~ 8 0
97 NGC 2085 Cl* 05 40 08.6 -69 40 20     12.06     ~ 20 0
98 PSR B0540-69 Psr 05 40 11.2000490438 -69 19 54.198559829           ~ 904 3
99 NGC 2086 Cl* 05 40 23.9 -69 40 17     12.00     ~ 27 1
100 LHA 120-N 160E EmO 05 40 27 -69 41.7           ~ 5 0
101 LHA 120-N 175 HII 05 40 46.7 -70 02 34           ~ 19 1
102 NGC 2103 As* 05 41 38.1 -71 19 49     10.82     ~ 58 0
103 NGC 2100 Cl* 05 42 07.200 -69 12 26.99   9.6       ~ 189 0
104 LHA 120-N 164 EmO 05 42 34 -69 04.9           ~ 20 0
105 LHA 120-N 163 HII 05 43 04.6 -69 45 57           ~ 24 0
106 SNR B0543-68.9 SNR 05 43 08 -68 58.3           ~ 56 0
107 LHA 120-N 74A EmO 05 45 41 -67 10.0           ~ 10 0
108 LHA 120-N 180A EmO 05 48 44 -70 03.2           ~ 17 0
109 NGC 2122 As* 05 48 55 -70 04.1     10.43     ~ 91 0
110 LHA 120-N 180 HII 05 49 13 -70 06.4           ~ 34 0
111 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2527 2
112 LHA 120-N 113N EmO ~ ~           ~ 3 0
113 LHA 120-N 55N EmO ~ ~           ~ 2 0
114 LHA 120-N 113S EmO ~ ~           ~ 2 0

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