Sizing Up Lyman-alpha ad Lyman-break Galaxies at z>2

Details Sizing Up Lyman-alpha ad Lyman-break Galaxies at z>2 Sizing Up Lyman-alpha ad Lyman-break Galaxies at z>2

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21740703m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #407.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We show that galaxies grow more luminous only if they grow in linear size. This is because the Luminosity per unit area has a distinct upper limit due to the self-limiting nature of star-formation. As a first corollary to this we show that the observed increase in characteristic luminosity of Lyman-Break Galaxies- L*, with time is due to an increase in size which scales as 1/(1+z). In contrast, Lyman-alpha galaxies have a characteristic, constant size between redshift z=2.25 and 6.5, which explains the constant luminosity function as measured in UV continuum. The compact physical size seems to be the critical determining factor in whether a galaxy will show lyman-alpha emission.

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