Loading...
Please wait, while we are loading the content...
Similar Documents
WERE PROGENITORS OF LOCALL* GALAXIES Lyα EMITTERS AT HIGH REDSHIFT?
| Content Provider | Scilit |
|---|---|
| Author | Yajima, Hidenobu Li, Yuexing Zhu, Qirong Abel, Tom Gronwall, Caryl Ciardullo, Robin B. |
| Copyright Year | 2012 |
| Description | Journal: The Astrophysical Journal The Lyα emission has been observed from galaxies over a redshift span z ~ 0-8.6. However, the evolution of high-redshift Lyα emitters (LAEs), and the link between these populations and local galaxies, remains poorly understood. Here, we investigate the Lyα properties of progenitors of a local L* galaxy by combining cosmological hydrodynamic simulations with three-dimensional radiative transfer calculations using the new $ART^{2}$ code. We find that the main progenitor (the most massive one) of a Milky-Way-like galaxy has a number of Lyα properties close to those of observed LAEs at z ~ 2-6, but most of the fainter ones appear to fall below the detection limits of current surveys. The Lyα photon escape fraction depends sensitively on a number of physical properties of the galaxy, such as mass, star formation rate, and metallicity, as well as galaxy morphology and orientation. Moreover, we find that high-redshift LAEs show blueshifted Lyα line profiles characteristic of gas inflow, and that the Lyα emission by excitation cooling increases with redshift, and becomes dominant at z 6. Our results suggest that some observed LAEs at z ~ 2-6 with luminosity of L$ _{Lyα}$ ~ $10^{42}-10^{43}$ erg $s^{–1}$ may be similar to the main progenitor of the Milky Way at high redshift, and that they may evolve into present-day L* galaxies. |
| Related Links | http://arxiv.org/pdf/1112.1031 http://iopscience.iop.org/article/10.1088/0004-637X/754/2/118/pdf |
| ISSN | 0004637X |
| DOI | 10.1088/0004-637x/754/2/118 |
| Journal | The Astrophysical Journal |
| Issue Number | 2 |
| Volume Number | 754 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2012-08-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: The Astrophysical Journal Astronomy and Astrophysics Lyα Emission |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
