The radio structure of the nuclear region of NGC 2146

Details The radio structure of the nuclear region of NGC 2146 The radio structure of the nuclear region of NGC 2146

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243...89k&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 89-91, 93-96. Research supported by the Natural Sciences and Engineer

Astronomy and Astrophysics

Astronomy

56

Galactic Nuclei, Galactic Structure, Radio Interferometers, Radio Sources (Astronomy), Stellar Evolution, Astronomical Maps, B Stars, Cosmic Rays, Hydrogen Clouds, Linear Polarization, O Stars, Pulsars, Supernova Remnants

Scientific paper

VLA and NRAO interferometer maps of NGC 2146 at four frequencies are discussed and compared with each other and with optical and near-infrared photographs. At 1".2 resolution the radio source reveals an S shaped complex of radio sources at the galaxy's nucleus whose central component has S5 GHz ∼6 mJy. This source almost certainly identifies the true nucleus of the galaxy. The overall radio source, unlike the optical, has a remarkable degree of symmetry. The radio emission ridges do not correspond to the dust lanes, and the radio center is hidden behind strong absorption. No linear polarization is found at our highest frequency of 8.1 GHz on a scale ≥ 150 pc. Also, no significant spectral index variations on a scale greater than 230 pc over the radio source are found.
We suggest that the radio emission in NGC 2146 can be explained by a recent, strong burst of star formation involving only 0 and possibly early B type stars whose associated supernova remnants and pulsars provide the cosmic rays responsible for the relatively powerful 3 kpc complex of radio emission.
Possible explanations for the inner bar-shaped triple source in NGC 2146 are discussed, and we note that this feature has a counterpart in several other galaxies, whose inner continuum structure we have compared with NGC 2146.

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