1998A&A...335.1117H

Query : 1998A&A...335.1117H

1998A&A...335.1117H - Astronomy and Astrophysics, volume 3351117-1123 (1998/7-3)

New clues to the magnetic field structure of M 31.

HAN J.L., BECK R. and BERKHUIJSEN E.M.

Abstract (from CDS):

We observed 21 polarized background radio sources in the field of M 31 at 1.365GHz and 1.652GHz, and determined their rotation measures (RMs). The RM data show that the regular magnetic field of the disk probably extends from about 5kpc to 25kpc from the center with similar structure. The RMs obtained from the polarized emission from M 31 at λ6 cm and λ11 cm indicate that M 31 might have a weak poloidal field in its tenuous halo. Observational features of the odd and even dynamo modes in a galaxy are discussed. An even mode (S0) dynamo may operate in M 31.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: magnetic fields - Galaxies: halos - Galaxies: ISM - Galaxies: individual: M 31 - Polarization

Simbad objects: 36

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Number of rows : 36
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 NVSS J003956+411138 Rad 00 39 56.496 +41 11 35.96           ~ 15 1
2 WSTB 37W45a Rad 00 39 57.5 +41 11 46           ~ 1 0
3 WSTB 37W50b Rad 00 40 13.3 +41 09 03           ~ 2 0
4 NVSS J004013+410845 Rad 00 40 13.51 +41 08 47.7           ~ 13 1
5 WSTB 37W50a Rad 00 40 13.8 +41 08 37           ~ 2 0
6 WSTB 37W57 Rad 00 40 24.8 +41 07 15           ~ 10 0
7 WSTB 37W74A Rad 00 41 07.7 +41 24 56           ~ 2 0
8 NVSS J004107+412455 Rad 00 41 07.93 +41 24 55.6           ~ 11 1
9 WSTB 37W74B Rad 00 41 12.8 +41 24 58           ~ 2 0
10 WSTB 37W89 Rad 00 41 38.99 +41 30 30.2           ~ 8 0
11 NVSS J004139+413034 Rad 00 41 39.18 +41 30 36.0           ~ 2 1
12 WSTB 37W89b Rad 00 41 39.4 +41 30 40           ~ 2 0
13 WSTB 37W91 Rad 00 41 41.06 +41 03 36.8           ~ 13 0
14 NVSS J004147+411848 Rad 00 41 47.73 +41 18 48.0           ~ 13 1
15 WSTB 37W94a Rad 00 41 48.1 +41 18 47           ~ 1 0
16 5C 3.107 Rad 00 42 18.74 +41 29 28.2           ~ 18 0
17 BD+41 114 * 00 42 35.4369590880 +41 57 46.903289652   10.82 9.26 11.0   K0 14 0
18 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
19 5C 3.111 Rad 00 42 51.76 +41 26 37.9           ~ 11 0
20 WSTB 37W152 Rad 00 43 08.27 +41 55 06.6           ~ 4 0
21 NVSS J004341+405429 Rad 00 43 41.27 +40 54 28.0           ~ 14 1
22 5C 3.124 Rad 00 43 54.29 +40 46 37.6           ~ 10 0
23 WSTB 37W175b Rad 00 43 57.8 +41 57 18           ~ 2 0
24 5C 3.126 AG? 00 43 58.791 +41 57 16.41           ~ 14 1
25 WSTB 37W175a Rad 00 44 00.0 +41 57 18           ~ 2 0
26 NVSS J004423+413040 Rad 00 44 24.19 +41 30 42.5           ~ 10 1
27 NVSS J004501+412452 Rad 00 45 01.96 +41 24 52.4           ~ 14 1
28 WSTB 37W207B Rad 00 45 05.9 +41 22 46           ~ 3 0
29 NVSS J004511+411126 Rad 00 45 11.59 +41 11 22.7           ~ 12 1
30 NVSS J004539+411217 Rad 00 45 40.03 +41 12 17.7           ~ 10 1
31 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
32 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
33 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
34 NGC 3432 AG? 10 52 31.132 +36 37 07.60   11.81 11.67 11.29   ~ 321 1
35 NGC 4631 GiC 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1154 3
36 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4

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