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Astron. Astrophys. 319, 737-746 (1997)

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Shocks and ring in the barred spiral galaxy NGC 1530

D. Reynaud and D. Downes

Institut de Radio Astronomie Millimétrique, F-38406 Saint Martin d'Hères, France

Received 8 July 1996 / Accepted 2 September 1996


We present new CO(1-0) and HCN(1-0) observations of the barred spiral galaxy NGC 1530 at resolutions of [FORMULA] and [FORMULA] respectively. Both CO and HCN are abundant in the nucleus, where we detect two strong, curved shock fronts curling around a possible nuclear ring. The ring is clumpy and may be elongated along the bar. The kinematics of the gas can be fit with a model with infall motions up to [FORMULA] along the shocks and quasi-circular rotation in the ring. We estimate the radii of the two inner Lindblad resonances that correspond to the boundaries of the ring and to the location of shock fronts to be 0.1 and 1.2 kpc. Maximum HCN emission seems to arise at the connections of the shock fronts to the nuclear ring, at a radius of 0.6 kpc from the center of the galaxy.

Key words: galaxies: structure – galaxies: individual (NGC 1530) – galaxies: ISM – galaxies: kinematics and dynamics – galaxies: nuclei – radio lines: galaxies

Send offprint requests to: D. Downes

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998