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Astron. Astrophys. 317, 36-42 (1997)

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The velocity field of the barred spiral galaxy NGC 1300 revisited *

P.A.B. Lindblad , H. Kristen , S. Jörsäter and J. Högbom

Stockholm Observatory, S-13336 Saltsjöbaden, Sweden

Received 5 February 1996 / Accepted 22 May 1996

Abstract

The re-reduction, described in Jörsäter & van Moorsel (1995), of NGC 1300 VLA H I observations, originally obtained by M. England, motivates a new analysis of the velocity field and rotation curve. Fitting tilted ring models to the H I velocity data, we find the new values for the orientation parameters of NGC 1300 to be [FORMULA] and [FORMULA]. Subsequently, the H I rotation curve is extracted, and a residual velocity map constructed. The H I velocity residuals in the bar region are found to be consistent with elliptical motion aligned with the bar major axis. Further out the residual velocities correlate with the position of the H I spiral arms.

We use 16 optical long slit emission line spectra, covering mainly the nuclear, bar, and inner arm region, to resolve the inner part of the velocity field. Three new spectra are presented in this investigation, and the remaining 13 are found in the literature. The optical velocities reveal a sharply rising rotation curve in the inner [FORMULA], not seen in the H I data due to beam-smearing. The optical velocity field is weighted together with the H I velocities to produce a combined velocity field. This velocity field is interpreted using hydrodynamical models in a subsequent paper by Lindblad & Kristen (1996).

Key words: galaxies: individual NGC 1300 — galaxies: kinematics and dynamics — galaxies: barred spiral

* Based on observations made at the European Southern Observatory (ESO), La Silla, Chile, and the VLA, Socorro, N.M. USA. The VLA is a facility of the National Radio Astronomy Observatory, which is operated by Associated Universities, Inc., under contract with the National Science Foundation.

Send offprint requests to: P.A.B. Lindblad (email: pabli@astro.su.se)

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