The physical nature of Lyα-emitting galaxies at <i>z</i>=3.1

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dc.contributor.authorGawiser, E
dc.contributor.authorvan Dokkum, PG
dc.contributor.authorGronwall, C
dc.contributor.authorCiardullo, R
dc.contributor.authorBlanc, GA
dc.contributor.authorCastander, FJ
dc.contributor.authorFeldmeier, J
dc.contributor.authorFrancke, H
dc.contributor.authorFranx, M
dc.contributor.authorHaberzettl, L
dc.contributor.authorHerrera, D
dc.contributor.authorHickey, T
dc.contributor.authorInfante, L
dc.contributor.authorLira, P
dc.contributor.authorMaza, J
dc.contributor.authorQuadri, R
dc.contributor.authorRichardson, A
dc.contributor.authorSchawinski, K
dc.contributor.authorSchirmer, M
dc.contributor.authorTaylor, EN
dc.contributor.authorTreister, E
dc.contributor.authorUrry, CM
dc.contributor.authorVirani, SN
dc.date.accessioned2025-01-21T01:06:12Z
dc.date.available2025-01-21T01:06:12Z
dc.date.issued2006
dc.description.abstractWe selected 40 candidate Ly alpha-emitting galaxies ( LAEs) at z similar or equal to 3.1 with observed-frame equivalent widths greater than 150 and inferred emission-line fluxes above 2.5 x 10(-17) ergs cm(-2) s(-1) from deep narrowband and broadband MUSYC images of the Extended Chandra Deep Field South. Covering 992 arcmin(2), this is the largest "blank field" surveyed for LAEs at z similar to 3, allowing an improved estimate of the space density of this population of ( 3 +/- 1) x 10(-4) h(70)(3) Mpc(-3). Spectroscopic follow-up of 23 candidates yielded 18 redshifts, all at z similar or equal to 3.1. Over 80% of the LAEs are dimmer in continuum magnitude than the typical Lyman break galaxy ( LBG) spectroscopic limit of R = 25.5 ( AB), with a median continuum magnitude R similar or equal to 27 and very blue continuum colors, V-z similar or equal to 0. Over 80% of the LAEs have the right UVR colors to be selected as LBGs, but only 10% also have R <= 25.5. Stacking the UBVRIzJK fluxes reveals that LAEs have stellar masses similar or equal to 5 x 10(8) h(70)(-2) M-circle dot and minimal dust extinction, A(V) less than or similar to 0.1. Inferred star formation rates are similar or equal to 6 h(70)(-2) M-circle dot yr(-1), yielding a cosmic star formation rate density of 2 x 10(-3) h(70) M-circle dot yr(-1) Mpc(-3). None of our LAE candidates show evidence for rest-frame emission-line equivalent widths EWrest > 240 (A) over circle that might imply a nonstandard initial mass function. One candidate is detected by Chandra, implying an AGN fraction of 2% +/- 2% for LAE candidate samples. In summary, LAEs at z similar to 3 have rapid star formation, low stellar mass, little dust obscuration, and no evidence for a substantial AGN component.
dc.fuente.origenWOS
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96108
dc.identifier.wosidWOS:000237206900004
dc.issue.numero1
dc.language.isoen
dc.pagina.finalL16
dc.pagina.inicioL13
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectgalaxies : high-redshift
dc.titleThe physical nature of Lyα-emitting galaxies at <i>z</i>=3.1
dc.typeartículo
dc.volumen642
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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