Gas flow, population structure and starburst activity in the central zone of NGC 4736

Bibcode
1990ESOC...35..309V
Varela, A. M.; Beckman, J. E.; Munoz-Tunon, C.; Cepa, J.; Vilchez, J. M.
Bibliographical reference

IN: ESO/CTIO Workshop on Bulges of Galaxies, La Serena, Chile, Jan. 16-19, 1990, Proceedings (A92-18101 05-90). Garching, Federal Republic of Germany, European Southern Observatory, 1990, p. 309-313.

Advertised on:
0
1990
Number of authors
5
IAC number of authors
5
Citations
0
Refereed citations
0
Description
The Sb galaxy NGC 4736 has a well observed ring of bright HII regions just outside its bulge, at some 1.3 kpc from the nucleus, with an apparent expansion velocity of about 30 km/s. Dynamical evidence is produced to show that this outflow originated in a starburst in the bulge which occurred some 3 x 10 exp 7 years ago. Corroborative evidence for the presence of star-forming activity in the bulge at that time is shown from color maps in B-V and R-I, which reveal excesses, in a series of concentric segments centered on the nucleus, expected from the coherent star-forming processes characteristic of a starburst, well defined in space and time.
Type
Non-refereed
Spiral galaxies
Starburst galaxies
H II regions

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