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The Central Region of NGC 1365. SEST and VLA Observations of CO and the Radio Continuum

Published online by Cambridge University Press:  19 July 2016

Aa. Sandqvist
Affiliation:
Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden
S. Jörsäter
Affiliation:
Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden
P. O. Lindblad
Affiliation:
Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden

Abstract

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The barred spiral Seyfert galaxy NGC 1365 has been observed in the radio continuum at wavelengths of 2, 6 and 20 cm, using scaled arrays of the VLA, and complete maps have been made in the J = 1–0 and J = 2–1 CO emission lines using the SEST. MEM maps of the 6 and 20 cm emission, as well as a spectral index map, have been produced with a resolution of 2″.3 × 0″.9, and the 2-cm map has a resolution of 0″.25 ×0″.10. The dominant continuum features are a number of unresolved sources with relatively flat non-thermal spectral indices (−0.3 to −0.5), immersed in an incomplete circumnuclear ring, which is superimposed upon a background that extends into the bar along the prominent dust lanes. The ring has angular dimensions of 8″ × 20″, which corresponds to a linear dimension of the order of 1 kpc. There is clear evidence of a jet, about 5″ long, originating at the position of the Seyfert nucleus and extending in a southeastern direction, closely along the minor axis of the galaxy. The jet has a steep non-thermal spectral index (–1.0) and is aligned along the axis of a conical shell of [OIII] emission. The CO molecular gas peaks at the nucleus and is strongly concentrated to the nucleus and bar regions with a certain enhancement along the bar. The total molecular hydrogen gas mass in the observed region is 2 × 1010 M , with 6 × 109 M lying within 2.2 kpc of the nucleus. A full presentation of the results will be published in Astronomy and Astrophysics in 1994.

Type
Poster Contributions: Radio Emission (Maps)
Copyright
Copyright © Kluwer 1994