2014A&A...567A.134J


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.01CEST04:50:33

2014A&A...567A.134J - Astronomy and Astrophysics, volume 567A, 134-134 (2014/7-1)

Magnetic fields and star formation in low-mass Magellanic-type and peculiar galaxies.

JURUSIK W., DRZAZGA R.T., JABLEKA M., CHYZY K.T., BECK R., KLEIN U. and WEZGOWIEC M.

Abstract (from CDS):

We investigate how magnetic properties of Magellanic-type and perturbed objects are related to star-forming activity, galactic type, and mass. We present radio and magnetic properties of five Magellanic-type and two peculiar low-mass galaxies observed at 4.85 and/or 8.35GHz with the Effelsberg 100m telescope. The sample is extended to 17 objects by including five Magellanic-type galaxies and five dwarf ones. The distribution of the observed radio emission of low-mass galaxies at 4.85/8.35GHz is closely connected with the galactic optical discs, which are independent for unperturbed galaxies and those which show signs of tidal interactions. The strengths of total magnetic field are within 5-9µG, while the ordered fields reach 1-2µG, and both these values are larger than in typical dwarf galaxies and lower than in spirals. The magnetic field strengths in the extended sample of 17 low-mass galaxies are well correlated with the surface density of star formation rate (correlation coefficient of 0.87) and manifest a power-law relation with an exponent of 0.25±0.02 extending a similar relation found for dwarf galaxies. We claim that the production of magnetic energy per supernova event is very similar for all the various galaxies. It constitutes about 3% (1049erg) of the individual supernovae energy release. We show that the total magnetic field energy in galaxies is almost linearly related to the galactic gas mass, which indicates equipartition of the magnetic energy and the turbulent kinetic energy of the interstellar medium. The Magellanic-type galaxies fit very well with the radio-infrared relation constructed for surface brightness of galaxies of various types, including bright spirals and interacting objects (with a slope of 0.96±0.03 and correlation coefficient of 0.95). We found that the typical far-infrared relation based on luminosity of galaxies is tighter and steeper but more likely to inherit a partial correlation from a tendency that larger objects are also more luminous. The estimated values of thermal fractions, radio spectral indices, and magnetic field strengths of the Magellanic-type galaxies are between the values determined for grand-design spirals and dwarf galaxies. The confirmed magnetic field-star formation and radio-infrared relations for low-mass galaxies point to similar physical processes that must be at work in all galaxies. More massive, larger galaxies have usually stronger magnetic fields and larger global star formation rates, but we show that their values of magnetic energy release per supernova explosion are still similar to those of dwarf galaxies.

Abstract Copyright:

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

Status at CDS:  

Simbad objects: 29

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Number of rows : 29

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     ~ 996 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10769 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9283 1
4 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1095 2
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5543 1
6 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1143 3
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14614 1
8 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 575 1
9 NAME M 81-82 Group GrG 09 55 +69.1           ~ 625 0
10 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3930 5
11 NGC 3239 IG 10 25 04.867 +17 09 49.21   13.5       ~ 150 0
12 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 597 1
13 NGC 4027 IG 11 59 30.168 -19 15 54.62   11.71 11.10 10.60 11.5 ~ 226 1
14 NGC 4204 GiC 12 15 14.359 +20 39 32.68   14.3       ~ 112 0
15 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 361 1
16 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 748 2
17 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1012 1
18 NGC 4605 GiG 12 39 59.381 +61 36 33.09   10.94   10.35   ~ 285 2
19 NGC 4618 GiP 12 41 32.8926165605 +41 09 03.051998352 11.03 11.22 10.78     ~ 288 2
20 NGC 4656 GiP 12 43 57.6880843523 +32 10 13.343087893   10.96 10.52     ~ 315 3
21 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1040 2
22 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 416 0
23 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3671 1
24 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2200 2
25 NAME M101 Group GrG 14 03 +54.3           ~ 83 1
26 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1418 0
27 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2213 2
28 UGC 11861 G 21 56 24.148 +73 15 39.33   15.2       ~ 84 0
29 NAME Local Group GrG ~ ~           ~ 6841 0

    Equat.    Gal    SGal    Ecl

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2020.04.01-04:50:33

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