Ly Alpha-Emitting Galaxies At Z=2.1 In ECDF-S: Building Blocks Of Typical Present-Day Galaxies?

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dc.contributor.utaustinauthorBlanc, Guillermo A.en_US
dc.creatorGuaita, Luciaen_US
dc.creatorGawiser, Ericen_US
dc.creatorPadilla, Nelsonen_US
dc.creatorFrancke, Harolden_US
dc.creatorBond, Nicholas A.en_US
dc.creatorGronwall, Carylen_US
dc.creatorCiardullo, Robinen_US
dc.creatorFeldmeier, John J.en_US
dc.creatorSinawa, Shawnen_US
dc.creatorBlanc, Guillermo A.en_US
dc.creatorVirani, Shanilen_US
dc.date.accessioned2016-04-28T19:36:02Z
dc.date.available2016-04-28T19:36:02Z
dc.date.issued2010-05en
dc.description.abstractWe discovered a sample of 250 Ly alpha emitting (LAE) galaxies at z similar or equal to 2.1 in an ultra-deep 3727 angstrom narrow-band MUSYC image of the Extended Chandra Deep Field-South. The LAEs were selected to have rest-frame equivalent widths (EWs) > 20 angstrom and emission-line fluxes F(Ly alpha) > 2.0 x 10(-17) erg cm(-2) s(-1), after carefully subtracting the continuum contributions from narrow-band photometry. The median emission-line flux of our sample is F(Ly alpha) = 4.2 x 10(-17) erg cm(-2) s(-1), corresponding to a median Ly alpha luminosity L(Ly alpha) = 1.3 x 10(42) erg s(-1) at z similar or equal to 2.1. At this flux, our sample is >= 90% complete. Approximately 4% of the original NB-selected candidates were detected in X-rays by Chandra, and 7% were detected in the rest-frame far-UV by the Galaxy Evolution Explorer; these objects were eliminated to minimize contamination by active galactic nuclei and low-redshift galaxies. At L(Ly alpha) >= 1.3 x 10(42) erg s(-1), the EW distribution is unbiased and is represented by an exponential with scale-length 83 +/- 10 angstrom. Above this same luminosity threshold, we find a number density of 1.5 +/- 0.5 x 10(-3) Mpc(-3). Neither the number density of LAEs nor the scale-length of their EW distribution show significant evolution from z similar or equal to 3 to z similar or equal to 2. We used the rest-frame UV luminosity to estimate a median star formation rate of 4 M(circle dot) yr(-1). The median rest-frame UV slope, parameterized by the color B - R, is typical of dust-free, 0.5-1 Gyr old or moderately dusty, 300-500 Myr old population. Approximately 30% of our sample is consistent with being very young (age < 100 Myr) galaxies without dust. Approximately 40% of the sample occupies the z similar to 2 star-forming galaxy locus in the UVR two-color diagram, but the true percentage could be significantly higher taking into account photometric errors. Clustering analysis reveals that LAEs at z similar or equal to 2.1 have r(0) = 4.8 +/- 0.9 Mpc, corresponding to a bias factor b = 1.8 +/- 0.3. This implies that z similar or equal to 2.1 LAEs reside in dark matter halos with median masses log(M/M(circle dot)) = 11.5(-0.5)(+0.4), which are among the lowest mass halos yet probed at this redshift. We used the Sheth and Tormen conditional mass function to study the descendants of these LAEs and found that their typical present-day descendants are local galaxies with L* properties, like the Milky Way.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipFondecyt 1071006en_US
dc.description.sponsorshipFondap 15010003en_US
dc.description.sponsorshipProyecto Conicyt/Programa de Financiamiento Basal para Centro Cientificos y Tecnologicos de Excelencia PFB06en_US
dc.description.sponsorshipProyecto Mecesup 2 PUC0609en_US
dc.description.sponsorshipALMA-SOCHIAS funden_US
dc.description.sponsorshipNational Science Foundation AST-0807570, AST-0807885en_US
dc.description.sponsorshipDepartment of Energy DE-FG02-08ER41560, DE-FG02-08ER41561en_US
dc.description.sponsorshipNASAen_US
dc.identifierdoi:10.15781/T2WN7B
dc.identifier.Filename2010_05_lyalpha.pdfen_US
dc.identifier.citationGuaita, Lucia, Eric Gawiser, Nelson Padilla, Harold Francke, Nicholas A. Bond, Caryl Gronwall, Robin Ciardullo et al. "Ly?-Emitting Galaxies at z= 2.1 in ECDF-S: Building Blocks of Typical Present-day Galaxies?." The Astrophysical Journal, Vol. 714, No. 1 (May., 2010): 255.en_US
dc.identifier.doi10.1088/0004-637x/714/1/255en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34866
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: 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_US
dc.rights.restrictionOpenen_US
dc.subjectgalaxies: high-redshiften_US
dc.subjectgalaxies: photometryen_US
dc.subjectgalaxies: star formationen_US
dc.subjectsurveysen_US
dc.subjectlyman-break galaxiesen_US
dc.subjectdeep field-southen_US
dc.subjectstar-forming galaxiesen_US
dc.subjectactiveen_US
dc.subjectgalactic nucleien_US
dc.subjecthigh-redshift galaxiesen_US
dc.subjectyale-chile musycen_US
dc.subjectsimilar-to 3en_US
dc.subjectluminosity densityen_US
dc.subjectradiation transferen_US
dc.subjectlarge-scaleen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleLy Alpha-Emitting Galaxies At Z=2.1 In ECDF-S: Building Blocks Of Typical Present-Day Galaxies?en_US
dc.typeArticleen_US

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