Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..531w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 531-543. Research supported by the Natural Sciences
Astronomy and Astrophysics
Astronomy
48
Continuous Spectra, Elliptical Galaxies, Galactic Nuclei, Galactic Structure, Radio Sources (Astronomy), Astronomical Maps, Data Reduction, Interferometry, Linear Polarization
Scientific paper
Aperture synthesis maps of the continuum emission from the nucleus of the elliptical galaxy NGC 1052 (0238-084) are presented at two frequencies near 1.5 GHz. The radio emission is dominated by a compact, flat-spectrum core of extent ⪉1" (93 pc). A 30" (2.8 kpc) double source straddles the compact core, in contrast with the usual compact core plus jet morphology. The 30" source shows a collimated, bent, and asymmetric structure. Embedded within each lobe of the double source is an active region which exhibits a relatively flat spectral index (-0.4), perhaps indicating the occurrence of in situ particle acceleration. The predicted inverse Compton X-ray flux from both active regions is four orders of magnitude below the observed level, making it unlikely that this emission mechanism is the cause of the galaxy's elongated X-ray image. The active regions are in pressure balance with the postshock gas associated with the "clouds" of gas which form the extended optical line-emitting region.
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