Lyα-emitting galaxies at z = 3.1: L* progenitors experiencing rapid star formation

Eric Gawiser, Harold Francke, Kamson Lai, Kevin Schawinski, Caryl Ann Gronwall, Robin Bruce Ciardullo, Ryan Quadri, Alvaro Orsi, L. Felipe Barrientos, Guillermo A. Blanc, Giovanni Fazio, John J. Feldmeier, Jia Sheng Huang, Leopoldo Infante, Paulina Lira, Nelson Padilla, Edward N. Taylor, Ezequiel Treister, C. Megan Urry, Pieter G. Van DokkumShanil N. Virani

Research output: Contribution to journalArticle

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Abstract

We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 Lyα-emitting (LAE) galaxies at z ≃ 3.1 discovered in deep narrowband MUSYC imaging of the Extended Chandra Deep Field-South. LAEs were selected to have observed frame equivalent widths >80 Å and emission line fluxes >1.5 × 10-17 ergs cm-2 s-1. Only 1% of our LAE sample appears to host AGNs. The LAEs exhibit a moderate spatial correlation length of r0 = 3.6-1.0+0.8 Mpc, corresponding to a bias factor b = 1.7-0.4+0.3, which implies median dark matter halo masses of log10Mmed = 10.9-0.9+0.5 M . Comparing the number density of LAEs, 1.5 ± 0.3 × 10-3 Mpc-3, with the number density of these halos finds a mean halo occupation ∼1%-10%. The evolution of galaxy bias with redshift implies that most z = 3.1 LAEs evolve into present-day galaxies with L < 2.5L*, whereas other z > 3 galaxy populations typically evolve into more massive galaxies. Halo merger trees show that z = 0 descendants occupy halos with a wide range of masses, with a median descendant mass close to that of L*. Only 30% of LAEs have sufficient stellar mass (>∼ 3 × 109 M) to yield detections in deep Spitzer IRAC imaging. A two-population SED fit to the stacked UBVRIzJK+[3.6, 4.5, 5.6, 8.0] μm fluxes of the IRAC-undetected objects finds that the typical LAE has low stellar mass (1.0-0.4+0.6 × 109 M ), moderate star formation rate (2 ± 1 M yr-1),ayoung component age of 20-10 +30 Myr, and little dust (AV < 0.2). The bestfit model has 20% of the mass in the young stellar component, but models without evolved stars are also allowed.

Original languageEnglish (US)
Pages (from-to)278-284
Number of pages7
JournalAstrophysical Journal
Volume671
Issue number1
DOIs
StatePublished - Dec 10 2007

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star formation
halos
galaxies
stellar mass
star formation rate
spectral energy distribution
occupation
narrowband
dark matter
erg
merger
dust
stars
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Gawiser, Eric ; Francke, Harold ; Lai, Kamson ; Schawinski, Kevin ; Gronwall, Caryl Ann ; Ciardullo, Robin Bruce ; Quadri, Ryan ; Orsi, Alvaro ; Barrientos, L. Felipe ; Blanc, Guillermo A. ; Fazio, Giovanni ; Feldmeier, John J. ; Huang, Jia Sheng ; Infante, Leopoldo ; Lira, Paulina ; Padilla, Nelson ; Taylor, Edward N. ; Treister, Ezequiel ; Megan Urry, C. ; Van Dokkum, Pieter G. ; Virani, Shanil N. / Lyα-emitting galaxies at z = 3.1 : L* progenitors experiencing rapid star formation. In: Astrophysical Journal. 2007 ; Vol. 671, No. 1. pp. 278-284.
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abstract = "We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 Lyα-emitting (LAE) galaxies at z ≃ 3.1 discovered in deep narrowband MUSYC imaging of the Extended Chandra Deep Field-South. LAEs were selected to have observed frame equivalent widths >80 {\AA} and emission line fluxes >1.5 × 10-17 ergs cm-2 s-1. Only 1{\%} of our LAE sample appears to host AGNs. The LAEs exhibit a moderate spatial correlation length of r0 = 3.6-1.0+0.8 Mpc, corresponding to a bias factor b = 1.7-0.4+0.3, which implies median dark matter halo masses of log10Mmed = 10.9-0.9+0.5 M ⊙. Comparing the number density of LAEs, 1.5 ± 0.3 × 10-3 Mpc-3, with the number density of these halos finds a mean halo occupation ∼1{\%}-10{\%}. The evolution of galaxy bias with redshift implies that most z = 3.1 LAEs evolve into present-day galaxies with L < 2.5L*, whereas other z > 3 galaxy populations typically evolve into more massive galaxies. Halo merger trees show that z = 0 descendants occupy halos with a wide range of masses, with a median descendant mass close to that of L*. Only 30{\%} of LAEs have sufficient stellar mass (>∼ 3 × 109 M⊙) to yield detections in deep Spitzer IRAC imaging. A two-population SED fit to the stacked UBVRIzJK+[3.6, 4.5, 5.6, 8.0] μm fluxes of the IRAC-undetected objects finds that the typical LAE has low stellar mass (1.0-0.4+0.6 × 109 M ⊙), moderate star formation rate (2 ± 1 M ⊙ yr-1),ayoung component age of 20-10 +30 Myr, and little dust (AV < 0.2). The bestfit model has 20{\%} of the mass in the young stellar component, but models without evolved stars are also allowed.",
author = "Eric Gawiser and Harold Francke and Kamson Lai and Kevin Schawinski and Gronwall, {Caryl Ann} and Ciardullo, {Robin Bruce} and Ryan Quadri and Alvaro Orsi and Barrientos, {L. Felipe} and Blanc, {Guillermo A.} and Giovanni Fazio and Feldmeier, {John J.} and Huang, {Jia Sheng} and Leopoldo Infante and Paulina Lira and Nelson Padilla and Taylor, {Edward N.} and Ezequiel Treister and {Megan Urry}, C. and {Van Dokkum}, {Pieter G.} and Virani, {Shanil N.}",
year = "2007",
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Gawiser, E, Francke, H, Lai, K, Schawinski, K, Gronwall, CA, Ciardullo, RB, Quadri, R, Orsi, A, Barrientos, LF, Blanc, GA, Fazio, G, Feldmeier, JJ, Huang, JS, Infante, L, Lira, P, Padilla, N, Taylor, EN, Treister, E, Megan Urry, C, Van Dokkum, PG & Virani, SN 2007, 'Lyα-emitting galaxies at z = 3.1: L* progenitors experiencing rapid star formation', Astrophysical Journal, vol. 671, no. 1, pp. 278-284. https://doi.org/10.1086/522955

Lyα-emitting galaxies at z = 3.1 : L* progenitors experiencing rapid star formation. / Gawiser, Eric; Francke, Harold; Lai, Kamson; Schawinski, Kevin; Gronwall, Caryl Ann; Ciardullo, Robin Bruce; Quadri, Ryan; Orsi, Alvaro; Barrientos, L. Felipe; Blanc, Guillermo A.; Fazio, Giovanni; Feldmeier, John J.; Huang, Jia Sheng; Infante, Leopoldo; Lira, Paulina; Padilla, Nelson; Taylor, Edward N.; Treister, Ezequiel; Megan Urry, C.; Van Dokkum, Pieter G.; Virani, Shanil N.

In: Astrophysical Journal, Vol. 671, No. 1, 10.12.2007, p. 278-284.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Lyα-emitting galaxies at z = 3.1

T2 - L* progenitors experiencing rapid star formation

AU - Gawiser, Eric

AU - Francke, Harold

AU - Lai, Kamson

AU - Schawinski, Kevin

AU - Gronwall, Caryl Ann

AU - Ciardullo, Robin Bruce

AU - Quadri, Ryan

AU - Orsi, Alvaro

AU - Barrientos, L. Felipe

AU - Blanc, Guillermo A.

AU - Fazio, Giovanni

AU - Feldmeier, John J.

AU - Huang, Jia Sheng

AU - Infante, Leopoldo

AU - Lira, Paulina

AU - Padilla, Nelson

AU - Taylor, Edward N.

AU - Treister, Ezequiel

AU - Megan Urry, C.

AU - Van Dokkum, Pieter G.

AU - Virani, Shanil N.

PY - 2007/12/10

Y1 - 2007/12/10

N2 - We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 Lyα-emitting (LAE) galaxies at z ≃ 3.1 discovered in deep narrowband MUSYC imaging of the Extended Chandra Deep Field-South. LAEs were selected to have observed frame equivalent widths >80 Å and emission line fluxes >1.5 × 10-17 ergs cm-2 s-1. Only 1% of our LAE sample appears to host AGNs. The LAEs exhibit a moderate spatial correlation length of r0 = 3.6-1.0+0.8 Mpc, corresponding to a bias factor b = 1.7-0.4+0.3, which implies median dark matter halo masses of log10Mmed = 10.9-0.9+0.5 M ⊙. Comparing the number density of LAEs, 1.5 ± 0.3 × 10-3 Mpc-3, with the number density of these halos finds a mean halo occupation ∼1%-10%. The evolution of galaxy bias with redshift implies that most z = 3.1 LAEs evolve into present-day galaxies with L < 2.5L*, whereas other z > 3 galaxy populations typically evolve into more massive galaxies. Halo merger trees show that z = 0 descendants occupy halos with a wide range of masses, with a median descendant mass close to that of L*. Only 30% of LAEs have sufficient stellar mass (>∼ 3 × 109 M⊙) to yield detections in deep Spitzer IRAC imaging. A two-population SED fit to the stacked UBVRIzJK+[3.6, 4.5, 5.6, 8.0] μm fluxes of the IRAC-undetected objects finds that the typical LAE has low stellar mass (1.0-0.4+0.6 × 109 M ⊙), moderate star formation rate (2 ± 1 M ⊙ yr-1),ayoung component age of 20-10 +30 Myr, and little dust (AV < 0.2). The bestfit model has 20% of the mass in the young stellar component, but models without evolved stars are also allowed.

AB - We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 Lyα-emitting (LAE) galaxies at z ≃ 3.1 discovered in deep narrowband MUSYC imaging of the Extended Chandra Deep Field-South. LAEs were selected to have observed frame equivalent widths >80 Å and emission line fluxes >1.5 × 10-17 ergs cm-2 s-1. Only 1% of our LAE sample appears to host AGNs. The LAEs exhibit a moderate spatial correlation length of r0 = 3.6-1.0+0.8 Mpc, corresponding to a bias factor b = 1.7-0.4+0.3, which implies median dark matter halo masses of log10Mmed = 10.9-0.9+0.5 M ⊙. Comparing the number density of LAEs, 1.5 ± 0.3 × 10-3 Mpc-3, with the number density of these halos finds a mean halo occupation ∼1%-10%. The evolution of galaxy bias with redshift implies that most z = 3.1 LAEs evolve into present-day galaxies with L < 2.5L*, whereas other z > 3 galaxy populations typically evolve into more massive galaxies. Halo merger trees show that z = 0 descendants occupy halos with a wide range of masses, with a median descendant mass close to that of L*. Only 30% of LAEs have sufficient stellar mass (>∼ 3 × 109 M⊙) to yield detections in deep Spitzer IRAC imaging. A two-population SED fit to the stacked UBVRIzJK+[3.6, 4.5, 5.6, 8.0] μm fluxes of the IRAC-undetected objects finds that the typical LAE has low stellar mass (1.0-0.4+0.6 × 109 M ⊙), moderate star formation rate (2 ± 1 M ⊙ yr-1),ayoung component age of 20-10 +30 Myr, and little dust (AV < 0.2). The bestfit model has 20% of the mass in the young stellar component, but models without evolved stars are also allowed.

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