Echelle observations of the complex H-alpha and N II forbidden line profiles from the galactic H II region M17 (NGC 6618)

Details Echelle observations of the complex H-alpha and N II forbidden line profiles from the galactic H II region M17 (NGC 6618) Echelle observations of the complex H-alpha and N II forbidden line profiles from the galactic H II region M17 (NGC 6618)

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..761c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Oct. 1, 1985, p. 761-774. Research supported by th

Astronomy and Astrophysics

Astronomy

21

Astronomical Spectroscopy, H Alpha Line, H Ii Regions, Nebulae, Nitrogen, Astronomical Models, Dynamic Characteristics, Emission Spectra, Forbidden Transitions, Milky Way Galaxy, Radial Velocity

Scientific paper

Profiles of the Hα and [N II] emission lines have been obtained along two lines, of unprecedented extent, over the face of the dusty, H II and molecular complex of M17. Also an [S II] Schmidt photograph has been digitally processed to reveal clearly the features in the nebulosity which have a low degree of ionization. Several velocity components are found to be continuous over large areas of M17. Two of these at VHEL ≅ 20 km s-1 and 9 km s-1 are closely associated with the extensive components in the molecular clouds. Over the bright nebular core the third component changes systematically to more negative velocities (from VHEL ≅ 0 to -40 km s-1) over a distance of a few parsecs. The approaching side of a radially expanding shell is suggested. At the position exhibiting the highest negative radial velocity of this shell, a collimated stream of ionized material is emerging. There is no evidence in this data that the outer, faint, filamentary structure is in a state of radial expansion. All of these motions are considered in the light of current theories.

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