2016ApJ...819...39C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST05:08:20

2016ApJ...819...39C - Astrophys. J., 819, 39 (2016/March-1)

The magnetized galactic wind and synchrotron halo of the starburst dwarf galaxy IC 10.

CHYZY K.T., DRZAZGA R.T., BECK R., URBANIK M., HEESEN V. and BOMANS D.J.

Abstract (from CDS):

We aim to explore whether strong magnetic fields can be effectively generated in low-mass dwarf galaxies and, if so, whether such fields can be affected by galactic outflows and spread out into the intergalactic medium (IGM). We performed a radio continuum polarimetry study of IC 10, the nearest starbursting dwarf galaxy, using a combination of multifrequency interferometric (VLA) and single-dish (Effelsberg) observations. VLA observations at 1.43 GHz reveal an extensive and almost spherical radio halo of IC 10 in total intensity, extending twice more than the infrared-emitting galactic disk. The halo is magnetized with a magnetic field strength of 7 µG in the outermost parts. Locally, the magnetic field reaches about 29 µG in H II complexes, becomes more ordered, and weakens to 22 µG in the synchrotron superbubble and to 7-10 µG within H I holes. At the higher frequency of 4.86 GHz, we found a large-scale magnetic field structure of X-shaped morphology, similar to that observed in several edge-on spiral galaxies. The X-shaped magnetic structure can be caused by the galactic wind, advecting magnetic fields injected into the interstellar medium by stellar winds and supernova explosions. The radio continuum scale heights at 1.43 GHz indicate the bulk speed of cosmic-ray electrons outflowing from H II complexes of about 60 km s–1, exceeding the escape velocity of 40 km s–1. Hence, the magnetized galactic wind in IC 10 inflates the extensive radio halo visible at 1.43 GHz and can seed the IGM with both random and ordered magnetic fields. These are signatures of intense material feedback onto the IGM, expected to be prevalent in the protogalaxies of the early universe.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: irregular - galaxies: magnetic fields - Local Group - radio continuum: galaxies

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1008 0
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2929 2
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
4 ICRF J005952.2+581223 QSO 00 59 52.2083579204 +58 12 23.682108462           ~ 15 1
5 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2495 2
6 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1147 3
7 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 745 1
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1734 1
10 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 581 1
11 NGC 3239 IG 10 25 04.867 +17 09 49.21   13.5       ~ 150 0
12 NGC 4027 IG 11 59 30.168 -19 15 54.62   11.71 11.10 10.60 11.5 ~ 227 1
13 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1022 1
14 NGC 4605 GiG 12 39 59.381 +61 36 33.09   10.94   10.35   ~ 285 2
15 NGC 4618 GiP 12 41 32.8926165605 +41 09 03.051998352 11.03 11.22 10.78     ~ 291 2
16 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 969 2
17 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 420 0
18 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3715 1
19 NGC 5775 GiP 14 53 57.653 +03 32 40.10   13.0 11.34     ~ 391 2
20 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1428 0
21 UGC 11861 G 21 56 24.148 +73 15 39.33   15.2       ~ 84 0
22 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1109 2
23 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-05:08:20

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