Near-infrared line and radio continuum imaging of the Circinus galaxy

Details Near-infrared line and radio continuum imaging of the Circinus galaxy Near-infrared line and radio continuum imaging of the Circinus galaxy

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.293..189d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 293, p. 189

Astronomy and Astrophysics

Astronomy

19

Seyfert Galaxies, Infrared Radiation, Active Galactic Nuclei, Local Group (Astronomy), Radio Astronomy, Emission Spectra, Hydrogen

Scientific paper

We have imaged the Circinus galaxy in the near-IR forbidden Fe II 1.64-micron and H2 2.12-micron lines, and derived velocity maps for the emission. The morphologies are strikingly different, but the velocity maps are very similar and consistent with simple rotation. We also present new radio continuum maps at 3 and 6 cm, which show a partially resolved nucleus with a flat spectral index. This suggests free-free absorption rather than self-absorption in a compact source. There is some evidence of radio jets close to the nucleus. The H2 emission, rather than the forbidden Fe II as in NGC 1068, is extended along the jet axis and may be excited by jet-induced shocks either in a low-density medium or with rather slow shock speeds. We find that the star formation in the ring 10 arcsec from the nucleus began less than a few x 10 exp 7 yr ago. Nearer the AGN, perhaps in and around the inferred torus, we detect extended forbidden Fe II emission (including one prominent peak about 2 arcsec north of the AGN, which could be due to a single young remnant), from which we derive a modest star formation rate of less than 1 solar mass/yr.

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