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

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    2010_05_lyalpha.pdf (990.4Kb)
    Date
    2010-05
    Author
    Guaita, Lucia
    Gawiser, Eric
    Padilla, Nelson
    Francke, Harold
    Bond, Nicholas A.
    Gronwall, Caryl
    Ciardullo, Robin
    Feldmeier, John J.
    Sinawa, Shawn
    Blanc, Guillermo A.
    Virani, Shanil
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    Abstract
    We 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.
    Department
    Astronomy
    Subject
    galaxies: high-redshift
    galaxies: photometry
    galaxies: star formation
    surveys
    lyman-break galaxies
    deep field-south
    star-forming galaxies
    active
    galactic nuclei
    high-redshift galaxies
    yale-chile musyc
    similar-to 3
    luminosity density
    radiation transfer
    large-scale
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34866
    Citation
    Guaita, 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.
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