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Date and Time of the Query: 2019-06-17 T18:37:12 PDT
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For refcode 1984ApJ...284..531W:
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Copyright by American Astronomical Society. Reproduced by permission
1984ApJ...284..531W RADIO CONTINUUM ACTIVITY IN THE ELLIPTICAL GALAXY NGC 1052 J. M. WROBEL National Radio Astronomy Observatory, Charlottesville, Virginia; Department of Astronomy, University of Toronto, Toronto, Ontario ABSTRACT 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 <~ (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 this extended source are two active regions, one located to the east and one to the west of the compact core. The extent of each active region is 5" x 2" (460 pc x 190 pc). The spectral index of the emission from other than the compact core is steep (-1.2) and that of the active regions is relatively flat (-0.4). The minimum-energy magnetic fields and energy densities of the active regions are similar to those of extended luminous sources, although the minimum energies are eight orders of magnitude lower. The inverse Compton X-ray flux expected from these regions is four orders of magnitude below the observed level. These regions are in pressure balance with the postshock gas associated with the "clouds" of gas which form the galaxy's extended optical line-emitting region (LER). The 1 GHz optical depth of this LER is negligible, but that of the galaxy's unresolved (<~3") LER would be significant if it was sufficiently compact. The linear polarizations of the peaks of the active regions are <~ 17%. One of these regions is depolarized by a factor of more than 1.9 over only 0.3 GHz, possibly because of the presence of ionized gas within the active region, or because of magnetic fields within optical emission-line "clouds" along the line of sight to the active region. The case for dynamical interaction between the galaxy's radio source and nuclear gas is examined. Subject headings: galaxies: individual - galaxies: nuclei - galaxies: structure - interferometry - polarization - radio sources: galaxies - radio sources: spectra
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