329 research outputs found
Chemodynamics of Lyman alpha emitters, Lyman break galaxies and elliptical galaxies
We report an ultra-high-resolution simulation that follows evolution from the
earliest stages of galaxy formation through the period of dynamical relaxation.
The bubble structures of gas revealed in our simulation (
years) resemble closely the high-redshift Lyman emitters (LAEs). After
years these bodies are dominated by stellar continuum radiation and look
like the Lyman break galaxies (LBGs) known as the high-redshift star-forming
galaxies at which point the abundance of elements appears to be solar. After
years, these galaxies resemble present-day ellipticals. The
comparisons of simulation results with the observations of elliptical galaxies
allow us to conclude that LAEs and LBGs are infants of elliptical galaxies or
bulge systems in the nearby universe.Comment: To appear in the proceedings of the CRAL-Conference Series I
"Chemodynamics: from first stars to local galaxies", Lyon 10-14 July 2006,
France, Eds. Emsellem, Wozniak, Massacrier, Gonzalez, Devriendt, Champavert,
EAS Publications Serie
Large-Scale Structure of Short-Lived Lyman\alpha Emitters
Recently discovered large-scale structure of Ly\alpha Emitters (LAEs) raises
a novel challenge to the cold dark matter (CDM) cosmology. The structure is
extended over more than 50 Mpc at redshift z=3.1, and exhibits a considerably
weak angular correlation. Such properties of LAE distributions appear to be
incompatible with the standard biased galaxy formation scenario in the CDM
cosmology. In this paper, by considering the possibility that LAEs are
short-lived events, we attempt to build up the picture of LAEs concordant with
the CDM cosmology. We find that if the lifetime of LAEs is as short as (6.7 \pm
0.6) \times 10^7 yr, the distributions of simulated galaxies successfully match
the extension and morphology of large-scale structure of LAEs at z=3.1, and
also the weak angular correlation function. This result implies that LAEs at
z=3.1 do not necessarily reside in high density peaks, but tends to be located
in less dense regions, in a different way from the expectation by the standard
biased galaxy formation scenario. In addition, we make a prediction for the
angular correlation function of LAEs at redshifts higher than 3. It is found
that the prediction deviates from that by the standard biased galaxy formation
scenario even at redshifts 4 < z < 6.Comment: 5 pages, 4 figures, accepted for publication in MNRA
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