J/A+A/578/A93 IC 342 multi-frequency radio polarization study (Beck, 2015)
Magnetic fields in the nearby spiral galaxy IC 342:
A multi-frequency radio polarization study.
Beck R.
<Astron. Astrophys. 578, A93 (2015)>
=2015A&A...578A..93B 2015A&A...578A..93B
ADC_Keywords: Galaxies, nearby ; Radio sources ; Magnetic fields
Keywords: galaxies: spiral - galaxies: magnetic fields - galaxies: ISM -
galaxies: individual: IC 342 - radio continuum: galaxies -
radio continuum: ISM
Abstract:
Magnetic fields play an important role in the formation and
stabilization of spiral structures in galaxies, but the interaction
between interstellar gas and magnetic fields has not yet been
understood. In particular, the phenomenon of "magnetic arms"
located between material arms is a mystery.
The strength and structure of interstellar magnetic fields and their
relation to spiral arms in gas and dust are investigated in the nearby
and almost face-on spiral galaxy IC 342.
Description:
The total and polarized radio continuum emission of IC 342 was
observed with high spatial resolution in four wavelength bands with
the Effelsberg and VLA telescopes. At λ6.2cm the data from both
telescopes were combined. I separated thermal and nonthermal
(synchrotron) emission components with the help of the spectral index
distribution and derived maps of the magnetic field strength, degree
of magnetic field order, magnetic pitch angle, Faraday rotation
measure, and Faraday depolarization.
Objects:
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RA (2000) DE Designation(s)
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03 46 48.51 +68 05 46.0 IC 342 = UGC 2847
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 183 48 List of fits images
fits/* . 48 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension of image center (J2000)
10- 18 F9.5 deg DEdeg Declination of image center (J2000)
20- 21 I2 arcsec/pix Scale [2/20] Scale of the image
23- 26 I4 --- Nx [81/1024] Number of pixels along X-axis
28- 31 I4 --- Ny [81/1024] Number of pixels along Y-axis
33- 42 A10 "date" ObsDate Observation date
45- 51 F7.3 GHz Freq [1.4/116]? Frequency
56- 59 I4 Kibyte size [34/5161] Size of the fits file
61- 96 A36 --- FileName Name of the FITS file in subdirectory fits
98-183 A86 --- Title Title of the file
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Acknowledgements:
Rainer Beck, rbeck(at)mpifr-bonn.mpg.de
(End) Patricia Vannier [CDS] 22-Apr-2015