NGC 1569: the molecular and ionized gas near the superluminous star clusters A and B.

Details NGC 1569: the molecular and ionized gas near the superluminous star clusters A and B. NGC 1569: the molecular and ionized gas near the superluminous star clusters A and B.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312..391g&link_type=abstract

Astronomy and Astrophysics, v.312, p.391-396

Astronomy and Astrophysics

Astrophysics

28

Galaxies: Individual: Ngc 1569, Ngc 1705, Interstellar Medium, Star Clusters, Radio Lines: Galaxies

Scientific paper

The starburst in the irregular galaxy NGC 1569 has produced two superluminous star clusters A and B which strongly influence their surroundings through UV radiation, stellar winds, supernova explosions, and an outflow of very hot gas. Close to A and B is located the most prominent HII region of NGC 1569; our CO observations indicate that it contains ~ 2x10^6^Msun_ molecular gas which probably still feeds star formation of its internal stellar cluster. When comparing the molecular gas mass, calculated for Galactic conditions, and the virial mass we obtain a conversion factor ~ 20 times higher than the Galactic value. However, we believe that the molecular clouds near the stellar clusters are not in kinematic equilibrium so that the virial theorem does not apply; we therefore reject this conversion factor as unrealistic. Our spectroscopic observations seem to indicate an optical counterpart of the Hi cavity around A, though being smaller in extent, and a surrounding shell of ionized gas of ~ 50 pc diameter. The compact galaxy NGC 1705 contains a stellar cluster even brighter than A and B. We did not detect CO in this galaxy.

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