Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.584v&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
We show that the discrepancy between the Tully-Fisher relation and the luminosity function predicted by most phenomenological galaxy formation models is mostly due to overmerging of galaxy haloes. This overmerging problem, which plagues both the Press-Schechter formalism and dissipationless N-body simulations, can be circumvented by including a specific galaxy halo formation technique into an otherwise standard N-body code. Furthermore, we show that if one includes chemical evolution into the modelling, a significant fraction of stars need to be formed in short bursts which are triggered by merging events. Including starbursts and chemical evolution, and resolving the overmerging problem provides us with the means to simultaniously match the I-band Tully-Fisher relation and the B and K band luminosity functions within an Omega_0 = 1 sCDM structure formation scenario.
Jimenez Raul
Kampen Elco van
Peacock John A.
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