Tracing early structure formation with massive starburst galaxies and their implications for reionization
| dc.creator | Nagamine, Kentaro | |
| dc.creator | Cen, Renyue | |
| dc.creator | Furlanetto, Steven R. | |
| dc.creator | Hernquist, Lars | |
| dc.creator | Night, Christopher | |
| dc.creator | Ostriker, Jeremiah P. | |
| dc.date | 2006-02-23 | |
| dc.date.accessioned | 2026-07-07T07:00:51Z | |
| dc.date.available | 2026-07-07T07:00:51Z | |
| dc.description | Cosmological hydrodynamic simulations have significantly improved over the past several years, and we have already shown that the observed properties of Lyman-break galaxies (LBGs) at z=3 can be explained well by the massive galaxies in the simulations. Here we extend our study to z=6 and show that we obtain good agreement for the LBGs at the bright-end of the luminosity function (LF). Our simulations also suggest that the cosmic star formation rate density has a peak at z= 5-6, and that the current LBG surveys at z=6 are missing a significant number of faint galaxies that are dimmer than the current magnitude limit. Together, our results suggest that the universe could be reionized at z=6 by the Pop II stars in ordinary galaxies. We also estimate the LF of Lyman-alpha emitters (LAEs) at z=6 by relating the star formation rate in the simulation to the Ly-alpha luminosity. We find that the simulated LAE LFs agree with the observed data provided that the net escape fraction of Ly-alpha photon is f_{Ly-alpha} <= 0.1. We investigate two possible scenarios for this effect: (1) all sources in the simulation are uniformly dimmer by a factor of 10 through attenuation, and (2) one out of ten LAEs randomly lights up at a given moment. We show that the correlation strength of the LAE spatial distribution can possibly distinguish the two scenarios. | |
| dc.description | 9 pages, 4 figures. Summary of the talk given at the "First Light & Reionization" workshop at UC Irvine, May 2005. The published article is available from http://dx.doi.org/10.1016/j.newar.2005.11.002 | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0602523 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0602523 | |
| dc.identifier | New Astron.Rev. 50 (2006) 29-34 | |
| dc.identifier | doi:10.1016/j.newar.2005.11.002 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/108104 | |
| dc.subject | Astrophysics | |
| dc.title | Tracing early structure formation with massive starburst galaxies and their implications for reionization | |
| dc.type | text |