The faint-end slope of the redshift 5.7 Ly[alpha] luminosity function

Show simple item record

dc.creator Sawicki, Marcin, 1969-
dc.creator Henry, Alaina L.
dc.creator Martin, Crystal L.
dc.creator Dressler, Alan
dc.creator McCarthy, Patrick
dc.date.accessioned 2015-08-10T15:46:24Z
dc.date.available 2015-08-10T15:46:24Z
dc.date.issued 2012-01-10
dc.identifier.issn 0004-637X
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/26281
dc.description Publisher's version/PDF en_CA
dc.description.abstract Using new Keck DEIMOS spectroscopy, we examine the origin of the steep number counts of ultra-faint emission-line galaxies recently reported by Dressler et al. We confirm six Ly[alpha] emitters (LAEs), three of which have significant asymmetric line profiles with prominent wings extending 300–400 km s[superscript −1] redward of the peak emission. With these six LAEs, we revise our previous estimate of the number of faint LAEs in the Dressler et al. survey. Combining these data with the density of bright LAEs in the Cosmic Evolution Survey and Subaru Deep Field provides the best constraints to date on the redshift 5.7 LAE luminosity function (LF). Schechter function parameters, [phi] = 4.5 × 10[superscript −4] Mpc[superscript −3], L = 9.1 × 10[superscript 42] erg s[superscript −1], and [alpha] = −1.70, are estimated using a maximum likelihood technique with a model for slit-losses. To place this result in the context of the UV-selected galaxy population, we investigate how various parameterizations of the Ly[alpha] equivalent width distribution, along with the measured UV-continuum LF, affect shape and normalization of the Ly[alpha] LF. The nominal model, which uses z ∼ 6 equivalent widths from the literature, falls short of the observed space density of LAEs at the bright end, possibly indicating a need for higher equivalent widths. This parameterization of the equivalent width distribution implies that as many as 50% of our faintest LAEs should have M[subscript UV] [greater than] −18.0, rendering them undetectable in even the deepest Hubble Space Telescope surveys at this redshift. Hence, ultra-deep emission-line surveys find some of the faintest galaxies ever observed at the end of the reionization epoch. Such faint galaxies likely enrich the intergalactic medium with metals and maintain its ionized state in the post-reionization era. Observations of these objects provide a glimpse of the building blocks of present-day galaxies at an early time. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.publisher IOP Publishing
dc.relation.uri http://dx.doi.org/10.1088/0004-637X/744/2/149
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Galaxies -- Evolution
dc.subject.lcsh Galaxies -- Formation
dc.subject.lcsh Red shift
dc.title The faint-end slope of the redshift 5.7 Ly[alpha] luminosity function en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal 744(2), 149. (2012) en_CA


Files in this item


 

Copyright statement:

 
Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1088/0004-637X/744/2/149
 
 

This item appears in the following Collection(s)

Show simple item record