2023MNRAS.523.3471H

Query : 2023MNRAS.523.3471H

2023MNRAS.523.3471H - Mon. Not. R. Astron. Soc., 523, 3471-3486 (2023/August-2)

The C-Band All-Sky Survey (C-BASS): new constraints on the integrated radio spectrum of M 31.

HARPER S.E., BARR A., DICKINSON C., PEEL M.W., CEPEDA-ARROITA R., COPLEY C.J., GRUMITT R.D.P., LEAHY J.P., JONAS J.L., JONES M.E., LEECH J., PEARSON T.J., READHEAD A.C.S. and TAYLOR A.C.

Abstract (from CDS):

The Andromeda galaxy (M 31) is our closest neighbouring spiral galaxy, making it an ideal target for studying the physics of the interstellar medium in a galaxy very similar to our own. Using new observations of M 31 at 4.76 GHz by the C-Band All-Sky Survey (C-BASS), and all available radio data at 1° resolution, we produce the integrated spectrum and put new constraints on the synchrotron spectral index and anomalous microwave emission (AME) from M 31. We use aperture photometry and spectral modelling to fit for the integrated spectrum of M 31, and subtract a comprehensive model of nearby background radio sources. The AME in M 31 is detected at 3σ significance with a peak near 30 GHz and flux density 0.27 ± 0.09 Jy. The synchrotron spectral index of M 31 is flatter than our own Galaxy at α =-0.66 ± 0.03 with no strong evidence of spectral curvature. The emissivity of AME averaged over the total emission from M 31 is lower than typical AME sources in our Galaxy, implying that AME is not uniformly distributed throughout M 31 and instead is likely confined to sub-regions - this will need to be confirmed using future higher resolution observations around 20-30 GHz.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): radiation mechanism: non-thermal - radiation mechanism: thermal - galaxies: individual: M31 - galaxies: ISM - diffuse radiation - radio continuum: ISM

Simbad objects: 63

goto Full paper

goto View the references in ADS

Number of rows : 63
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 6C 002736+374812 BLL 00 30 18.6143763816 +38 04 01.004502468     18.40     ~ 10 1
2 7C 002742.00+380049.00 QSO 00 30 22.4780270664 +38 17 22.159436748   19.3       ~ 13 1
3 NVSS J003035+421128 Rad 00 30 35.1609641983 +42 11 27.947593241           ~ 5 1
4 NVSS J003039+423704 Rad 00 30 39.278 +42 37 01.66           ~ 3 1
5 4C 40.02 rG 00 30 48.82 +41 10 53.8           ~ 21 1
6 NVSS J003111+394156 Rad 00 31 11.387 +39 41 55.93           ~ 6 1
7 NVSS J003137+391904 Rad 00 31 37.84 +39 19 04.3           ~ 6 1
8 NVSS J003216+400711 Rad 00 32 16.2202 +40 07 11.474           ~ 6 1
9 NVSS J003235+394215 Rad 00 32 35.543 +39 42 16.22           ~ 9 1
10 NVSS J003406+430242 Rad 00 34 06.08 +43 02 44.2           ~ 3 1
11 NVSS J003419+424659 Rad 00 34 19.297 +42 47 00.01           ~ 4 1
12 NVSS J003428+403556 Rad 00 34 28.76 +40 35 57.9           ~ 8 1
13 4C 42.01 QSO 00 35 06.0619551120 +42 38 20.500051200     18.30     ~ 40 1
14 NVSS J003525+394047 Rad 00 35 25.73 +39 40 46.0           ~ 7 1
15 4C 42.02 Rad 00 36 38.610 +42 52 28.56           ~ 9 1
16 NVSS J003641+380903 Rad 00 36 41.338 +38 09 04.08           ~ 4 1
17 4C 35.01 Rad 00 37 19.27 +38 59 15.7     18     ~ 10 1
18 5C 3.44 QSO 00 37 36.7257098184 +39 38 11.795039412   18.18 17.95     ~ 47 1
19 6C 003542+412035 Bla 00 38 24.84358446 +41 37 06.0002701   19.9 19.9 18.95   ~ 143 1
20 NVSS J003848+411607 Rad 00 38 48.3295 +41 16 07.662           ~ 5 1
21 NVSS J003956+411138 Rad 00 39 56.496 +41 11 35.96           ~ 15 1
22 4C 39.02 rG 00 41 54.9928 +39 25 21.212           ~ 19 1
23 4C 39.03 Rad 00 42 17.4288 +40 09 48.522           ~ 25 1
24 87GB 003934.6+411250 AG? 00 42 18.684 +41 29 26.77           ~ 21 1
25 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
26 NVSS J004349+383010 Rad 00 43 49.40 +38 30 09.9           ~ 8 1
27 NVSS J004354+404634 rG 00 43 54.387 +40 46 34.03           ~ 8 1
28 NVSS J004358+393756 Rad 00 43 58.222 +39 37 56.88           ~ 7 1
29 4C 42.03 Rad 00 44 39.2 +42 48 01           ~ 15 1
30 7C 004158.10+381329.00 QSO 00 44 41.6261622960 +38 29 58.020902664           ~ 6 1
31 NVSS J004601+435517 Rad 00 46 01.806 +43 55 17.47           ~ 3 1
32 ICRF J004647.5+390047 Bla 00 46 47.57825636 +39 00 47.1480675       20.24   ~ 29 1
33 RX J0046.7+4208 XB? 00 46 48.198 +42 08 54.65           ~ 14 1
34 NVSS J004653+394254 Rad 00 46 53.5494 +39 42 54.220           ~ 5 1
35 NVSS J004654+435328 Rad 00 46 54.715 +43 53 28.69           ~ 4 1
36 6C 004509+393212 BLL 00 47 55.2237594912 +39 48 57.609757008   16.0 17.60 16.4   ~ 55 1
37 NVSS J004802+393726 Rad 00 48 02.0542 +39 37 26.732           ~ 8 1
38 4C 40.03 Rad 00 48 13.00 +40 21 52.5           ~ 16 1
39 NVSS J004824+431931 Rad 00 48 24.46 +43 19 31.2           ~ 3 1
40 NVSS J004843+404458 Rad 00 48 44.12 +40 45 03.7           ~ 8 1
41 NVSS J004844+395331 rG 00 48 45.020 +39 53 32.88           ~ 6 1
42 NVSS J004942+382259 Rad 00 49 42.379 +38 23 01.00           ~ 3 1
43 NVSS J005044+381310 Rad 00 50 45.067 +38 13 12.16           ~ 3 1
44 NVSS J005057+420452 Rad 00 50 57.154 +42 04 53.13           ~ 3 1
45 NVSS J005110+383842 Rad 00 51 11.7070290813 +38 38 38.840459148           ~ 4 1
46 NVSS J005213+424102 Rad 00 52 13.932 +42 41 01.99           ~ 3 1
47 NVSS J005331+402721 rG 00 53 31.857 +40 27 20.96           ~ 8 1
48 NVSS J005332+403443 Rad 00 53 32.21 +40 34 39.2           ~ 6 1
49 NVSS J005351+424936 rG 00 53 51.65936 +42 49 35.7849           ~ 4 2
50 NVSS J005405+412515 Rad 00 54 05.8447 +41 25 11.485           ~ 4 1
51 NVSS J005411+421634 Rad 00 54 11.395 +42 16 37.31           ~ 3 1
52 NVSS J005413+384214 rG 00 54 13.7553662053 +38 42 14.280950459           ~ 9 1
53 4C 38.04 Rad 00 54 56.05 +38 21 49.8           ~ 12 1
54 NVSS J005537+383212 Rad 00 55 37.665 +38 32 11.77           ~ 5 1
55 NVSS J005540+393337 Rad 00 55 40.33 +39 33 37.4           ~ 6 1
56 NVSS J005744+415410 Rad 00 57 44.515 +41 54 08.66           ~ 3 1
57 NVSS J005755+424606 Rad 00 57 55.4517258816 +42 46 06.093141312           ~ 3 1
58 NVSS J005832+390209 Rad 00 58 32.3394 +39 02 08.526           ~ 7 1
59 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
60 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 327 0
61 NGC 4725 Sy2 12 50 26.5716367992 +25 30 02.733090588   13.45 12.44     ~ 727 2
62 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
63 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

To bookmark this query, right click on this link: simbad:objects in 2023MNRAS.523.3471H and select 'bookmark this link' or equivalent in the popup menu