Optical long slit velocities and a combined optical and H i  velocity field for the barred spiral galaxy NGC 1365^*

¹ Stockholm Observatory, S-13336 Saltsjöbaden, Sweden
² Laboratorio de Astrofísica Espacial y Física Fundamental, Apartado 50727, E-28080 Madrid, Spain

Corresponding author: Send offprint request to: P.O.  Lindblad, e-mail: po@astro.su.se

Received: 22 December 1995
Accepted: 2 May 1996

Abstract

Optical emission line velocities in NGC 1365 are presented along 35 slit positions, of which 18 have not been published earlier. Diagrams of emission line velocities as function of distance along the slits are presented, and separate velocity fields are derived for the disc as given by the low excitation lines, combined with H i  21 cm VLA data, and for the nuclear outflow cone as given mainly by the high excitation lines. An algorithm for creating a velocity field and contour maps based on measurements along randomly oriented spectrograph slits is given in the Appendix. Detailed discussions and interpretations of these velocity fields are given elsewhere. The combined optical and 21 cm disc velocity field is available by an anonymous ftp.