2014ApJ...780..182M


Query : 2014ApJ...780..182M

2014ApJ...780..182M - Astrophys. J., 780, 182 (2014/January-2)

The role of magnetic fields in starburst galaxies as revealed by OH megamasers.

McBRIDE J., QUATAERT E., HEILES C. and BAUERMEISTER A.

Abstract (from CDS):

We present estimates of magnetic field strengths in the interstellar media of starburst galaxies derived from measurements of Zeeman splitting associated with OH megamasers. The results for eight galaxies with Zeeman detections suggest that the magnetic energy density in the interstellar medium of starburst galaxies is comparable to their hydrostatic gas pressure, as in the Milky Way. We discuss the significant uncertainties in this conclusion, and possible measurements that could reduce these uncertainties. We also compare the Zeeman splitting derived magnetic field estimates to magnetic field strengths estimated using synchrotron fluxes and assuming that the magnetic field and cosmic rays have comparable energy densities, known as the "minimum energy" argument. We find that the minimum energy argument systematically underestimates magnetic fields in starburst galaxies, and that the conditions that would be required to produce agreement between the minimum energy estimate and the Zeeman derived estimate of interstellar medium magnetic fields are implausible. The conclusion that magnetic fields in starburst galaxies exceed the minimum energy magnetic fields is consistent with starburst galaxies adhering to the linearity of the far-infrared-radio correlation.

Abstract Copyright:

Journal keyword(s): galaxies: ISM - galaxies: magnetic fields - galaxies: starburst - infrared: galaxies - masers

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ZW III 35 Sy2 01 44 30.516 +17 06 09.18   15.24 14.81     ~ 237 0
2 UGC 3097 G 04 35 48.4302410280 +02 15 29.990712312   15.6       ~ 42 0
3 PSCz Q06487+2208 H2G 06 51 45.8 +22 04 27           ~ 31 0
4 2MASX J08094723+0501093 G 08 09 47.236 +05 01 09.36           ~ 24 0
5 IC 2545 IG 10 06 04.581 -33 53 05.55   15.27 14.27 14.25   ~ 101 0
6 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 943 4
7 2MASX J12054771+1651085 LIN 12 05 47.7089284392 +16 51 08.355094704   18.758   17.327   ~ 56 0
8 LEDA 39024 LIN 12 13 46.107 +02 48 41.50           ~ 332 1
9 NGC 4355 Sy2 12 26 54.6206739120 -00 52 39.421212996   14.21 13.37     ~ 458 2
10 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1914 3
11 IC 860 LIN 13 15 03.51 +24 37 07.8   14.8       ~ 199 0
12 Mrk 273 Sy2 13 44 42.1883001096 +55 53 13.596220932   15.68 14.91     ~ 870 3
13 LEDA 165630 Sy2 14 09 31.257 +05 11 31.31     17.00     ~ 70 0
14 Z 49-57 GiC 15 13 13.1083645344 +07 13 32.099256084   15.5       ~ 223 1
15 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2846 4
16 LEDA 60189 LIN 17 23 21.943 -00 17 00.96   15.1       ~ 400 0
17 PSCz Q18368+3549 Sy2 18 38 35.435 +35 52 19.75           ~ 35 0
18 LEDA 165791 H2G 19 00 41.2 +35 21 27           ~ 22 0
19 2MASX J20572362+1707445 PaG 20 57 23.628 +17 07 44.60   15.2       ~ 153 0
20 LEDA 2817285 Sy2 21 29 29.4 +25 27 53           ~ 29 0

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2022.09.28-02:12:46

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