2005A&A...444..739B


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.22CEST23:31:58

2005A&A...444..739B - Astronomy and Astrophysics, volume 444, 739-765 (2005/12-4)

Magnetic fields in barred galaxies. IV. NGC 1097 and NGC 1365.

BECK R., FLETCHER A., SHUKUROV A., SNODIN A., SOKOLOFF D.D., EHLE M., MOSS D. and SHOUTENKOV V.

Abstract (from CDS):

We present λ3.5cm and λ6.2 cm radio continuum maps in total and polarized intensity of the barred galaxies NGC 1097 (at 2"-15" resolution) and NGC 1365 (at 9"-25" resolution). A previously unknown radio galaxy southwest of NGC 1097 is reported. Apart from a smooth faint envelope and a bright central region, both galaxies exhibit radio ridges roughly overlapping with the massive dust lanes in the bar region. The contrast in total intensity across the radio ridges is compatible with compression and shear of an isotropic random magnetic field, where the gas density compression ratio is approximately equal to 4 and the cosmic ray density is constant across the ridges. The contrast in polarized intensity is significantly smaller than that expected from compression and shearing of the regular magnetic field; this could be the result of decoupling of the regular field from the dense molecular clouds. The regular field in the ridge is probably strong enough to reduce significantly shear in the diffuse gas (to which it is coupled) and hence to reduce magnetic field amplification by shearing. This contributes to the misalignment of the observed field orientation with respect to the velocity vectors of the dense gas. Our observations, for the first time, indicate that magnetic forces can control the flow of the diffuse interstellar gas at kiloparsec scales. The total radio intensity reaches its maximum in the circumnuclear starburst regions, where the equipartition field strength is about 60µG, amongst the strongest fields detected in spiral galaxies so far. The regular field in the inner region has a spiral shape with large pitch angle, indicating the action of a dynamo. Magnetic stress leads to mass inflow towards the centre, sufficient to feed the active nucleus in NGC 1097. - We detected diffuse X-ray emission, possibly forming a halo of hot gas around NGC 1097.

Abstract Copyright:

Journal keyword(s): galaxies: magnetic fields - galaxies: individual: NGC 1097, NGC 1365 - galaxies: spiral - galaxies: structure - ISM: magnetic fields - galaxies: nuclei

Nomenclature: Paragr.3.1: [BFS2005] JHHMMSS.ss+DDMMSS.s N=1.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2415 2
2 QSO B0237-2322 QSO 02 40 08.1742481040 -23 09 15.727160394   16.78 16.63     ~ 465 0
3 ESO 416-19 GiG 02 46 09.8740740184 -30 13 41.207588084   14.61   13.02   ~ 58 1
4 [BFS2005] J024612.75-301705.3 rG 02 46 12.75 -30 17 05.3           ~ 2 0
5 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1139 3
6 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1459 2
7 NGC 1672 SyG 04 45 42.552 -59 14 50.68 10.29 10.53 9.68 9.53 10.2 ~ 301 1
8 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 717 1
9 NGC 2442 LIN 07 36 23.842 -69 31 50.96 11.47 11.15 10.42 9.71 10.4 ~ 172 1
10 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2138 2
11 NGC 7552 GiP 23 16 10.767 -42 35 05.39 11.34 11.22 10.57 10.08 11.1 ~ 484 3

    Equat.    Gal    SGal    Ecl

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2019.07.22-23:31:58

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