2011A&A...533A..22D


Query : 2011A&A...533A..22D

2011A&A...533A..22D - Astronomy and Astrophysics, volume 533A, 22-22 (2011/9-1)

Magnetic field evolution in interacting galaxies.

DRZAZGA R.T., CHYZY K.T., JURUSIK W. and WIORKIEWICZ K.

Abstract (from CDS):

Violent gravitational interactions can change the morphologies of galaxies and, by means of merging, transform them into elliptical galaxies. We aim to investigate how they affect the evolution of galactic magnetic fields. We selected 16 systems of interacting galaxies with available VLA archive radio data at 4.86 and 1.4GHz and compared their radio emission and estimated magnetic field strengths with their star-forming activity, far-infrared emission, and the stage of tidal interaction. The estimated mean of total magnetic field strength for our sample of interacting galaxies is 14±5µG, which is larger than for the non-interacting objects. The field regularity (of 0.27±0.09) is lower than in typical spirals and indicates enhanced production of random magnetic fields in the interacting objects. We find a general evolution of magnetic fields: for weak interactions the strength of magnetic field is almost constant (10-15µG) as interaction advances, then it increases up to 2x, peaks at the nuclear coalescence (25µG), and decreases again, down to 5-6µG, for the post-merger remnants. The main production of magnetic fields in colliding galaxies thus terminates somewhere close to the nuclear coalescence, after which magnetic field diffuses. The magnetic field strength for whole galaxies is weakly affected by the star formation rate (SFR), while the dependence is higher for galactic centres. We show that the morphological distortions visible in the radio total and polarized emission do not depend statistically on the global or local SFRs, while they do increase (especially in the polarization) with the advance of interaction. The constructed radio-far-infrared relations for interacting and non-interacting galaxies display a similar balance between the generation of cosmic rays, magnetic fields, and the production of the thermal energy and dust radiation. The regular magnetic fields are much more sensitive to morphological distortions induced by tidal interactions than are the random fields. As a result the polarized emission could be yet another indicator of an ongoing merging process. The found evolution of magnetic field with advancing interaction would definitely imply a stronger effect of magnetic fields on the galaxy surroundings in the earlier cosmological epochs. The process of strong gravitational interactions can efficiently magnetize the merger's surroundings, having a similar magnetizing effect on intergalactic medium as supernova explosions or galactic winds. If interacting galaxies generate some ultra-high energy cosmic rays (UHECRs), the disk or magnetized outflows can deflect them (up to 23°), and make an association of the observed UHECRs with the sites of their origin very uncertain.

Abstract Copyright:

Journal keyword(s): galaxies: general - galaxies: magnetic fields - galaxies: interactions - radio continuum: galaxies

Simbad objects: 43

goto Full paper

goto View the references in ADS

Number of rows : 43
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 UGC 12914 LIN 00 01 38.304 +23 29 01.18   13.2       ~ 139 1
2 NAME Taffy System PaG 00 01 40.12 +23 29 23.0           ~ 52 2
3 UGC 12915 GiP 00 01 41.937 +23 29 45.20   13.9       ~ 111 1
4 PHL 6352 QSO 00 10 33.99063132 +17 24 18.7613217   17.1 18.0 16.7   ~ 99 1
5 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11377 1
6 4C 48.06 Rad 01 14 23.40 +48 23 53.0           ~ 5 1
7 UGC 813 GiG 01 16 16.614 +46 44 23.50   14.6       ~ 49 1
8 VV 769 PaG 01 16 18.6 +46 44 38           ~ 41 1
9 UGC 816 GiG 01 16 20.543 +46 44 52.09   15.0 13.65 13.19 13.00 ~ 49 1
10 NGC 520 IG 01 24 35.071 +03 47 32.68 12.41 12.24 11.42     ~ 498 3
11 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2606 2
12 NGC 660 Sy2 01 43 02.350 +13 38 44.45   12.02 11.16     ~ 526 2
13 IC 163 GiG 01 49 14.983 +20 42 40.74   13.8       ~ 66 0
14 4C 15.05 Bla 02 04 50.41389571 +15 14 11.0436591   21.9 22.1 21.00   ~ 372 1
15 NGC 816 G 02 08 08.8783534565 +29 15 21.356716088   15.3       ~ 10 0
16 NGC 876 GiG 02 17 53.327 +14 31 17.91   16.5       ~ 58 0
17 NGC 877 LSB 02 17 59.6455492183 +14 32 38.205097954   12.5       ~ 163 1
18 NGC 1700 GiG 04 56 56.347 -04 51 56.64   12   11.14   ~ 333 1
19 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 777 1
20 QSO B0607-157 QSO 06 09 40.9477650070 -15 42 40.649794982   18.47 18.0 19.90   ~ 296 1
21 NGC 2207 IG 06 16 22.093 -21 22 21.80   11.48 10.65 10.21 11.9 ~ 265 3
22 IC 2163 IG 06 16 27.9664196735 -21 22 33.143354242   12.55   11.28   ~ 148 2
23 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5470 6
24 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 777 2
25 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1289 1
26 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1589 0
27 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1138 1
28 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 804 2
29 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6075 0
30 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3890 2
31 NGC 5426 GiP 14 03 24.855 -06 04 08.76   12.6   12.76 12.4 ~ 158 0
32 APG 271 IG 14 03 25.45 -06 02 59.9           ~ 209 0
33 NGC 5427 GiP 14 03 26.0408351752 -06 01 50.688001474   14.67 13.96 11.54   ~ 277 0
34 QSO B1406-076 QSO 14 08 56.48120036 -07 52 26.6664200   20.3 18.4     ~ 281 1
35 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2758 4
36 NGC 6621 G 18 12 55.276 +68 21 48.50   13.6       ~ 115 1
37 UGC 11175 PaG 18 12 57.6 +68 21 32           ~ 64 0
38 NGC 6622 GiP 18 13 00.21 +68 21 12.4   16       ~ 37 0
39 NGC 6908 GiG 20 25 06.643 -24 48 33.53   12.31   11.35   ~ 16 1
40 NGC 6907 G 20 25 06.9 -24 48 38   11.91 11.30 10.47 11.3 ~ 161 2
41 [VV2000] J213101.4-203656 QSO 21 31 01.475863 -20 36 56.15773     20.00     ~ 32 1
42 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 672 1
43 NGC 7727 GiP 23 39 53.870 -12 17 34.84   11   10.55   ~ 160 0

To bookmark this query, right click on this link: simbad:objects in 2011A&A...533A..22D and select 'bookmark this link' or equivalent in the popup menu


2021.08.02-12:22:21

© Université de Strasbourg/CNRS

    • Contact