Depolarization Silhouettes and the Filamentary Structure in the Radio Source Fornax A

Details Depolarization Silhouettes and the Filamentary Structure in the Radio Source Fornax A Depolarization Silhouettes and the Filamentary Structure in the Radio Source Fornax A

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adil...ef...01f&link_type=abstract

NCSA Astronomy Digital Image Library

Astronomy and Astrophysics

Astronomy

Dark Matter, Depolarization, Emission Spectra, Galactic Structure, Intergalactic Media, Interstellar Gas, Interstellar Magnetic Fields, Interstellar Matter, Ionized Gases, Molecular Clouds, Radio Galaxies, Radio Sources (Astronomy), Spatial Distribution, Spiral Galaxies, Very Large Array (Vla)

Scientific paper

The total-intensity image FORNAXI and the linearly polarized intensity image FORNAXP (both with 14 arcsec resolution) cover the radio source Fornax A (NGC 1316) at 1.51 GHz. FORNAXI: The maximum is 120 mJy per beam at the core, and the faintest features are about 1.0 mJy per beam. The rms noise in the center of each lobe is 0.15 mJy per beam. The core is slightly extended, and the lobes contain a wealth of detail. Other point sources are unrelated background sources, and the goat-head shape of the bright source, upper right, is caused by an instrumental artifact which occurs only at the edge of the image. FORNAXP: The linearly polarized intensity in the western lobe is 40 mJy per beam, and the faintest features are about 0.5 mJy per beam. The rms noise at the center of each lobe is 0.09 mJy per beam. The overall shape of the polarized emission is similar to that of the total intensity. However, there are several regions of low polarization of various shapes not associated with total-intensity features. One is caused by Faraday depolarization through the foreground Sc galaxy NGC 1310 (Schulman and Fomalont 1992). For more information on this study, please see the following references: Fomalont, E. B., Ebneter, K. A., van Breugel, W. J. M., and Ekers, R. D. 1989, ApJL, 346, L17; Schulman, E., and Fomalont, E. B. 1992, AJ, 103, 1138. The images and related TeX file come from the NRAO CDROM "Images From the Radio Universe" (c. 1992 National Radio Astronomy Observatory, used with permission).

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