Echelle observations of the spatially resolved kinematics of a region with high-speed motions in M17 (NGC 6618). II

Details Echelle observations of the spatially resolved kinematics of a region with high-speed motions in M17 (NGC 6618). II Echelle observations of the spatially resolved kinematics of a region with high-speed motions in M17 (NGC 6618). II

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..253m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Nov. 15, 1987, p. 253-268. SERC-supported research

Astronomy and Astrophysics

Astronomy

7

Gas Dynamics, Hydrogen Clouds, Ionized Gases, Plasma Jets, Spatial Resolution, Stellar Winds, Astronomical Spectroscopy, High Speed, Radial Velocity, Stellar Envelopes, Stellar Mass Ejection

Scientific paper

In Paper I, Clayton et al. (1985) reported the discovery of a "jet" of ionized gas ≅2 arcsec across emerging from a dark area of M17 with approaching speeds up to 115 km s-1.The vicinity of this jet has now been observed in detail in the light of [O III] 5007 Å. A variety of new high-speed phenomena has been discovered in the ionized gas. The most prominent of these are two isolated knots with radial velocities of -97 and -123 km s-1 with respect to the systemic. Also a ring of knots 0.43 pc in extent is found with values of VHel = -40 to -80 km s-1(VHel = +9 km s-1 for M17). One possibility is that these high-speed phenomena are produced by local sources of wind in the approaching edge of an expanding bubble. In this case the isolated high-speed knots could be ionized stellar jets viewed down their axes or individual bullets of material ejected in the break-up of circumstellar clouds. It also remains possible that many if not all of these high-speed phenomena could be the consequence of the powerful high-speed winds from the central OB association of M17.

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