2025A&A...696A.112S

Query : 2025A&A...696A.112S

2025A&A...696A.112S - Astronomy and Astrophysics, volume 696A112 (2025/4-1)

CHANG-ES XXXIV. Magnetic field structure in edge-on galaxie: Characterising large-scale magnetic fields in galactic halos.

STEIN M., KLEIMANN J., ADEBAHR B., DETTMAR R.-J., FICHTNER H., ENGLISH J., HEESEN V., KAMPHUIS P., IRWIN J., MELE C., BOMANS D.J., LI J., SKEGGS N.B., WANG Q.D. and YANG Y.

Abstract (from CDS):

Context. Understanding the configuration of galactic magnetic fields is essential for interpreting feedback processes in galaxies. Despite their importance, the exact structure of these fields, particularly in galactic halos, remains unclear. Accurate descriptions are crucial for understanding the interaction between star formation and halo magnetisation.
Aims. By systematically analysing the polarisation patterns in halos of nearby galaxies, we aim to deepen the understanding of the interplay between galactic magnetic fields and star formation processes. Here, we focus on the process of magnetising the galactic halo. Furthermore, we provide an analytical description of the observed X shaped halos.
Methods. Based on C band (6 GHz) radio polarimetry data, we manually classified the polarisation patterns of a sample of nearby late-type edge-on galaxies, by using a newly introduced three-class system: disc-dominated, small-scale, and X shaped. We then fitted X shaped patterns to the polarisation data for galaxies classified as X shaped and explored links between the polarisation patterns and other physical properties of these galaxies.
Results. The classification process shows that 11 out of 18 analysed galaxies with extended polarised halo emission display an X shaped polarisation pattern. Galaxies classified as disc-dominated seem less efficient at forming stars than expected for their stellar mass and rotate faster than galaxies with similarly sized HI discs. X shape modelling reveals that the polarisation patterns are best fitted by a constant-angle model, and we observe a correlation between the X shape opening angle and star formation rate surface density, indicating the interplay between the star formation in the disc and the magnetisation of the galactic halo.
Conclusions. The analysis of polarisation patterns in nearby galaxies reveals that most exhibit an X shaped configuration, indicating a common magnetic field structure in galactic halos. The introduced models capture the X shaped morphology and reveal the link between the X shape's opening angle and star formation rate surface density.

Abstract Copyright: © The Authors 2025

Journal keyword(s): polarization - galaxies: evolution - galaxies: halos - galaxies: magnetic fields - radio continuum: galaxies

Simbad objects: 31

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Number of rows : 31
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 NGC 660 Sy2 01 43 02.350 +13 38 44.45   12.02 11.16     ~ 588 2
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
3 NGC 2613 Sy2 08 33 22.841 -22 58 25.21   11.29 10.42 9.75 10.5 ~ 180 0
4 NGC 2683 AGN 08 52 41.3064829584 +33 25 18.597681516 11.57 10.68 9.79 9.38   ~ 475 1
5 NGC 2820 GiP 09 21 45.564 +64 15 28.87   13.1       ~ 172 0
6 NGC 3003 EmG 09 48 35.580 +33 25 17.83   12.3       ~ 225 0
7 NGC 3044 AG? 09 53 40.884 +01 34 46.74   12.7   12.7 12.3 ~ 239 1
8 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
9 NGC 3432 AG? 10 52 31.132 +36 37 07.60   11.81 11.67 11.29   ~ 321 1
10 NGC 3448 AG? 10 54 39.240 +54 18 18.82   12.2       ~ 238 1
11 M 108 AGN 11 11 30.967 +55 40 26.84   10.70       ~ 497 1
12 NGC 3628 LIN 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 853 3
13 NGC 3735 Sy2 11 35 57.2748856320 +70 32 07.951921080   12.4       ~ 202 2
14 NGC 3877 GiG 11 46 07.782 +47 29 40.20   11.8       ~ 347 0
15 NGC 4013 GiG 11 58 31.417 +43 56 49.28   12.4       ~ 447 1
16 NGC 4096 GiG 12 06 01.161 +47 28 42.09   11.61   10.86   ~ 271 0
17 NGC 4157 GiC 12 11 04.365 +50 29 04.85 12.48 12.15 11.35     ~ 373 2
18 M 98 LIN 12 13 48.2910686976 +14 54 01.953475200 11.25 10.95 10.14     ~ 499 2
19 NGC 4217 GiG 12 15 50.900 +47 05 30.44   12.4       ~ 324 2
20 NGC 4302 GiC 12 21 42.477 +14 35 51.94   13.4 11.61     ~ 348 0
21 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
22 NGC 4565 Sy2 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 991 0
23 NGC 4631 GiC 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1154 3
24 NGC 4666 AGN 12 45 08.676 -00 27 42.88   11.7   11.5 10.7 ~ 421 1
25 NGC 4668 EmG 12 45 31.941 -00 32 02.36   13.5   12.714   ~ 138 0
26 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
27 NGC 5297 GiP 13 46 23.694 +43 52 19.34   12.3       ~ 181 0
28 NGC 5775 GiG 14 53 57.653 +03 32 40.10   13.0 11.34     ~ 460 2
29 NGC 5792 Sy2 14 58 22.709 -01 05 27.89   11.8   11.8 11.1 ~ 194 1
30 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 807 0
31 NGC 6949 AGN 20 35 06.9170240784 +64 48 10.045666548   15.0       ~ 65 0

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