Galactic-scale star formation by gravitational instability
نویسندگان
چکیده
منابع مشابه
Control of Star Formation in Galaxies by Gravitational Instability
We present high resolution simulations of star formation in a wide range of disk galaxies, using a three-dimensional smoothed particle hydrodynamics code with an isothermal equation of state and no explicit feedback. Absorbing sink particles are inserted in high density regions to directly measure the mass of gravitationally collapsing gas. Despite the simplicity of our assumptions, our models ...
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The arena of investigation of star formation and its scaling laws is slowly, but consistently, shifting from the realm of luminous galaxies to that of faint ones and to sub–galactic regions, as existing and new facilities enable investigators to probe regions of the combined parameter space of surface brightness, wavelength, and angular resolution that were inaccessible until a few years ago. W...
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We investigate the formation of planetesimals via the gravitational instability of solids that have settled to the midplane of a circumstellar disk. Vertical shear between the gas and a subdisk of solids induces turbulent mixing which inhibits gravitational instability. Working in the limit of small, well-coupled particles, we find that the mixing becomes ineffective when the surface density ra...
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We examine the stability of feedback-regulated star formation (SF) in galactic nuclei and contrast it to SF in extended discs. In galactic nuclei, the orbital time becomes shorter than the time over which feedback from young stars evolves. We argue analytically that traditional feedback-regulated SF equilibrium models break down in the regime. We study this using numerical simulations with the ...
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We present a general star formation law in which the star formation rate depends upon the ef®ciency a and the time-scale t of star formation, and the gas component jg of the surface mass density. The current nominal Schmidt exponent nS for our model is 2 < nS < 3. Based on a gravitational instability parameter QA and another dimensionless parameter fP P=Gj 2 c , where P pressure and jc ...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2006
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s174392130700169x