A remarkable feature in the giant extragalactic H II region NGC 5471

Castaneda, Hector O.; Vilchez, J. M.; Copetti, Marcus V. F.
Bibliographical reference

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 164-167.

Advertised on:
12
1990
Number of authors
3
IAC number of authors
2
Citations
41
Refereed citations
39
Description
The discovery of a very high velocity, low-intensity gas feature in the giant extragalactic H II region NGC 5471 is reported. A broad component in the emission lines of H-alpha + forbidden N II 6548, 6584 A is located within an area less than 1 arcsec in diameter at the position known as knot C. The broad component is characterized by its low intensity, a contribution of roughly 25 percent to the total flux of the lines, and an extension of roughly 3300 km/s at full width at zero intensity (FWZI). Supernovae explosions and stellar winds are considered as possible sources of the gas motions, and the observational evidence for their presence is discussed.