2017A&A...603A.121C


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.22CET23:51:27

2017A&A...603A.121C - Astronomy and Astrophysics, volume 603A, 121-121 (2017/7-1)

What drives galactic magnetism?

CHYZY K.T., SRIDHAR S.S. and JURUSIK W.

Abstract (from CDS):

Aims. Magnetic fields are important ingredients of the interstellar medium. They are suspected to be maintained by dynamo processes related to star-formation activity, properties of the interstellar medium and global features of galaxies. We aim to use statistical analysis of a large number of various galaxies to probe, model, and understand relations between different galaxy properties and magnetic fields.
Methods. We have compiled a sample of 55 galaxies including low-mass dwarf and Magellanic-types, normal spirals and several massive starbursts, and applied principal component analysis (PCA) and regression methods to assess the impact of various galaxy properties on the observed magnetic fields.
Results. According to PCA the global galaxy parameters (like HI, H2, and dynamical mass, star formation rate (SFR), near-infrared luminosity, size, and rotational velocity) are all mutually correlated and can be reduced to a single principal component. Further PCA performed for global and intensive (not size related) properties of galaxies (such as gas density, and surface density of the star formation rate, SSFR), indicates that magnetic field strength B is connected mainly to the intensive parameters, while the global parameters have only weak relationships with B. We find that the tightest relationship of B is with SSFR, which is described by a power-law with an index of 0.33±0.03. The relation is observed for galaxies with the global SFR spread over more than four orders of magnitude. Only the radio faintest dwarf galaxies deviate from this relation probably due to the inverse Compton losses of relativistic electrons or long turbulence injection timescales. The observed weaker associations of B with galaxy dynamical mass and the rotational velocity we interpret as indirect ones, resulting from the observed connection of the global SFR with the available total H2 mass in galaxies. Using our sample we constructed a diagram of B across the Hubble sequence which reveals that high values of B are not restricted by the Hubble type and even dwarf (starbursting) galaxies can produce strong magnetic fields. However, weaker fields appear exclusively in later Hubble types and B as low as about 5µG is not seen among typical spirals.
Conclusions. The processes of generation of magnetic field in the dwarf and Magellanic-type galaxies are similar to those in the massive spirals and starbursts and are mainly coupled to local star-formation activity involving the small-scale dynamo mechanism.

Abstract Copyright: © ESO, 2017

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

Simbad objects: 65

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Number of rows : 65

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 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 562 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 988 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10672 1
4 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2879 2
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9182 1
6 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 353 0
7 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1089 2
8 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5052 1
9 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1356 1
10 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1500 2
11 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 683 1
12 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1156 3
13 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1490 2
14 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1369 1
15 NGC 1566 Sy1 04 20 00.4020009055 -54 56 16.578104141 10.29 10.19 9.73 9.21 10.1 ~ 700 2
16 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1141 3
17 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14471 1
18 RMC 103F * 05 37 50.2187594301 -69 04 24.289353398   12.71 11.77 11.56 10.78 ~ 8 0
19 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1579 1
20 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 969 1
21 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 971 3
22 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 570 1
23 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3916 5
24 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5254 6
25 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 539 0
26 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 457 0
27 UGC 5456 G 10 07 20.182 +10 21 40.16   13.78   13.24   ~ 93 0
28 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 642 2
29 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 613 0
30 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 802 1
31 NGC 3239 IG 10 25 04.867 +17 09 49.21   13.5       ~ 147 0
32 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 736 2
33 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 594 1
34 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1131 4
35 NGC 3628 GiP 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 738 3
36 M 109 GiG 11 57 35.984 +53 22 28.27   10.94   9.57   ~ 410 0
37 NGC 4027 IG 11 59 30.168 -19 15 54.62   11.71 11.10 10.60 11.5 ~ 225 1
38 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 851 1
39 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 358 1
40 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 743 2
41 NGC 4414 GiG 12 26 27.089 +31 13 24.76 11.12 10.96 10.12     ~ 509 2
42 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1001 1
43 NGC 4605 GiG 12 39 59.381 +61 36 33.09   10.94   10.35   ~ 283 2
44 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1249 3
45 NGC 4618 GiP 12 41 32.8926165605 +41 09 03.051998352 11.03 11.22 10.78     ~ 287 2
46 NGC 4656 GiP 12 43 57.6880843523 +32 10 13.343087893   10.96 10.52     ~ 312 3
47 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1193 3
48 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 793 2
49 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 434 0
50 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1031 2
51 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 410 0
52 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3710 4
53 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2179 2
54 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2493 2
55 NGC 5775 GiP 14 53 57.653 +03 32 40.10   13.0 11.34     ~ 386 2
56 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 661 1
57 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2639 4
58 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 271 1
59 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1414 0
60 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2198 2
61 NAME Aqr Galaxy GiC 20 48 01.194 -52 58 08.79   15.70       ~ 16 0
62 UGC 11861 G 21 56 24.148 +73 15 39.33   15.2       ~ 82 0
63 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1090 2
64 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 413 1
65 NAME Local Group GrG ~ ~           ~ 6762 0

    Equat.    Gal    SGal    Ecl

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2020.01.22-23:51:27

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