Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541006g&link_type=abstract
American Astronomical Society, AAS Meeting #215, #410.06; Bulletin of the American Astronomical Society, Vol. 42, p.235
Other
Scientific paper
Recent observations have revealed the surprising trend that high-redshift (z > 2) elliptical galaxies are a factor of 5 times more compact than galaxies of equivalent mass locally. We evaluate whether observational issues can account for the perceived compact size of ellipticals at high redshift. We simulate observations of redshift zero elliptical galaxies at z 2.4 to investigate the importance of surface-brightness dimming of galaxy wings, multi-component profiles, and stellar-population gradients. Since observational data exist with sufficient depth at z 2.4, we can distinguish that the light profiles are steeper at a given mass in the outer regions of high-redshift ellipticals. Our simulations demonstrate that while surface brightness dimming and other effects do artificially lower the measured effective radii at high redshift, they cannot fully account for the differences observed between massive galaxies at z 2 and the present.
Gordon Michael
Greene Jenny E.
Kriek Mariska
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