The Colors Of Galaxies At 4 < Z < 8 And Their Contribution To Reionization
| dc.contributor.utaustinauthor | Finkelstein, Steven L. | en |
| dc.creator | Finkelstein, S. L. | en |
| dc.date.accessioned | 2015-04-16T14:47:53Z | en |
| dc.date.available | 2015-04-16T14:47:53Z | en |
| dc.date.issued | 2012-09 | en |
| dc.description.abstract | We present recent results on the rest-frame ultraviolet (UV) colors of galaxies at high-redshift, and the contribution of these galaxies to the reionization of the intergalactic medium (IGM). Using a combination of deep and wide data from the CANDELS, HUDF09 and ERS programs, we find that galaxies at z = 7 appear to be dust free, and they become substantially dustier by z = 4. Faint galaxies at z = 7 appear very blue, but they are consistent with the colors of very blue local galaxies, thus there is no evidence for the presence of exotic stellar populations. We find that the observable galaxy population can sustain a fully ionized IGM at z = 6 if the escape fraction of ionizing photons (f(esc)) is 30%. If the luminosity function extends much fainter, then the required f(esc) is lowered to similar to 10%. Examining the constraint on the emission rate of ionizing photons from Ly alpha forest measurements, we find that if the luminosity function extends to M-UV = -13, f(esc) must be less than 13% at z = 6. This escape fraction can still sustain a reionized IGM at z = 6, and even at z = 7, but unless it rises substantially at z > 6, the IGM may be similar to 20 - 50% neutral by z = 8. | en |
| dc.description.department | Astronomy | en |
| dc.identifier.citation | Steven L. Finkelstein. AIP Conference Proceedings 1480, 261 (Sep., 2012); doi: 10.1063/1.4754364 | en |
| dc.identifier.doi | 10.1063/1.4754364 | en |
| dc.identifier.issn | 0094-243X | en |
| dc.identifier.issn | 978-0-7354-1092-3 | en |
| dc.identifier.uri | http://hdl.handle.net/2152/29435 | en |
| dc.language.iso | English | en |
| dc.relation.ispartofserial | First Stars IV - from Hayashi to the Future | en_US |
| dc.rights | Administrative deposit of works to UT Digital Repository: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University. | en |
| dc.subject | similar-to 7 | en |
| dc.subject | lyman-break galaxies | en |
| dc.subject | star-forming galaxies | en |
| dc.subject | ultra-deep-field | en |
| dc.subject | uv-continuum slope | en |
| dc.subject | ly-alpha emitters | en |
| dc.subject | luminosity | en |
| dc.subject | functions | en |
| dc.subject | spectroscopic confirmation | en |
| dc.subject | wfc3/ir observations | en |
| dc.subject | keck | en |
| dc.subject | spectroscopy | en |
| dc.subject | astronomy & astrophysics | en |
| dc.title | The Colors Of Galaxies At 4 < Z < 8 And Their Contribution To Reionization | en |
| dc.type | Article | en |
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