Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275..416k&link_type=abstract
Astronomy and Astrophysics, Vol.275, NO.2/AUG(II), P. 416, 1993
Astronomy and Astrophysics
Astrophysics
23
Scientific paper
We analyze the evolution of a massive gas cloud of order 10^8^ M_sun_ in the nucleus of a galaxy. The gas is located in the potential well of the central stellar cluster and is supported against free fall by turbulent motions. As the turbulent energy dissipates via cloud-loud collisions the radius of the gas cloud shrinks and at a critical density stars begin to form. Subsequent supernova explosions are then an important source of turbulent energy of the cloud. If the initial mass function for star formation is top-heavy with a lower limit m_1_>= 1 M_sun_ then the pumping rate of turbulent energy from SN exceeds the dissipation rate of the gas and repetitive bursts of star formation occur for a wide range of the basic parameters. We discuss this case in detail and conclude that if nuclear activity is defined by a large luminosity (>= 10^10^ L_sun_) from a small volume (R <= 1 kpc) activity it is an intrinsic process and need not be triggered from outside. The role of an interacting galaxy, which is frequently observed, is limited to the supply of fresh gas. In addition, we find under special conditions other types of solution to be discussed in a subsequent paper.
Krügel Endrik
Tutukov Aleksandr V.
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