Bibcode
Beckman, John E.
Bibliographical reference
IN: Mass outflows from stars and galactic nuclei; Proceedings of the Second Torino Workshop, Turin, Italy, May 4-8, 1987 (A88-54076 24-90). Dordrecht, Kluwer Academic Publishers, 1988, p. 385-390.
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0
1988
Citations
2
Refereed citations
2
Description
In the circumnuclear zones of the disks of some spirals there is an
absence of neutral interstellar hydrogen. A model is devised in which
gaseous outflow is sustained by the combined action of massive stars in
these zones. The energy requirement, which implies driving out the gas
against gravity, can be satisfied if 10 percent or more of the gas
condenses into massive stars. A problem is efficient coupling of energy
into outflow without disrupting the molecular gas. It is shown that
combined stellar winds can just satisfy the energy and momentum
requirements for outflow, as can supernovas. Dust in the molecular
clouds would permit radiation to couple strongly to the gas. All these
effects are present. Observable consequences should be: (1) expansion
with velocities of tens of km/s near the nuclei of some galaxies, (2)
absence of neutral gas near the centers of poststarburst galaxies, and
(3) metallicity gradients, with residual gas near the nucleus being
metal-rich and a peak of stellar metallicity in a ring whose distance
from the nucleus depends on the age of the burst.