Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-03-18
Astrophys.J. 498 (1998) 504
Astronomy and Astrophysics
Astrophysics
Minor revisions to match version published in May 10 ApJ. 1998, ApJ, 498, 504-521. Uses emulateapj.sty. Also available at ht
Scientific paper
10.1086/305563
We use a semi-analytic model of galaxy formation in hierarchical clustering theories to interpret recent data on galaxy formation and evolution, focussing primarily on the recently discovered population of Lyman-break galaxies at $z\simeq 3$. For a variety of cold dark matter (CDM) cosmologies we construct mock galaxy catalogues subject to identical selection criteria to those applied to the real data. We find that the expected number of Lyman-break galaxies is very sensitive to the assumed stellar initial mass function and to the normalization of the primordial power spectrum. For reasonable choices of these and other model parameters, it is possible to reproduce the observed abundance of Lyman-break galaxies in CDM models with $\Omega_0=1$ and with $\Omega_0<1$. These galaxies generally form from rare peaks at high redshift and, as a result, their spatial distribution is strongly biased, with a typical bias parameter, $b\simeq 4$, and a comoving correlation length, $r_0\simeq 4 \mpc$. The typical sizes of these galaxies, $\sim 0.5\kpc$, are substantially smaller than those of present day bright galaxies. In combination with data at lower redshifts, the Lyman-break galaxies can be used to trace the cosmic star formation history. Most galaxies (in our models and in the data) never experience star formation rates in excess of a few solar masses per year. Our models predict that even at $z=5$, the integrated star formation rate is similar to that measured locally, although less than 1% of all the stars have formed prior to this redshift. These galaxies mark the onset of the epoch of galaxy formation that continues into the present day. The basic ingredients of a consistent picture of galaxy formation may well be now in place.
Baugh Carlton M.
Cole Shaun
Frenk Carlos S.
Lacey Cedric G.
No associations
LandOfFree
The Epoch of Galaxy Formation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Epoch of Galaxy Formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Epoch of Galaxy Formation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-269597