Echelle observations of gas motions in NGC 604
Open Access
- 1 March 1988
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 231 (2) , 191-204
- https://doi.org/10.1093/mnras/231.2.191
Abstract
Flux calibrated line profiles of the Hα, [N II], [S II] and [O III] emission lines have been obtained along a cut across the core of the giant H II complex NGC 604 in M33. These line profiles and an IPCS image of NGC 604 in the light of Hα and [N II] were acquired using the Manchester echelle spectrometer II. The existence of expanding wind-driven shells of ionized gas around the Wolf–Rayet objects CM12 and CM13 have been confirmed in all four emission lines and their energetics measured. The shell around CM12 appears to have broken out of the edge of the H I ridge in which the energizing stars were formed. In addition, 450 km s−1 broad Hα 6563 Å (or possibly He II) emission has been quantifiably detected from the vicinity of CM12 which is similar to that observed from η Carinae. Also a jet-like feature, extending to −75km s−1 with respect to the systemic velocity can be seen in the [S II] spectra at the intersection of the two wind-driven shells. Possible dynamical models for all of these phenomena are considered.Keywords
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