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Discovery of extreme [O III]+Hβ emitting galaxies tracing an overdensity at z ∼ 3.5 in CDF-South

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Organization
Abstract
Using deep multi-wavelength photometry of galaxies from ZFOURGE, we group galaxies at 2.5 < z < 4.0 by the shape of their spectral energy distributions (SEDs). We identify a population of galaxies with excess emission in the K-s-band, which corresponds to [O III]+H beta emission at 2.95 < z < 3.65. This population includes 78% of the bluest galaxies with UV slopes steeper than beta = -2. We de-redshift and scale this photometry to build two composite SEDs, enabling us to measure equivalent widths of these extreme [O III]+H beta emission line galaxies (EELGs) at z similar to 3.5. We identify 60 galaxies that comprise a composite SED with a [O III]+H beta rest-frame equivalent width of 803 +/- 228 angstrom and another 218 galaxies in a composite SED with an equivalent width of 230 +/- 90 angstrom. These EELGs are analogous to the "green peas" found in the SDSS and are thought to be undergoing their first burst of star formation due to their blue colors (beta < -1.6), young ages (log(age yr(-1))similar to 7.2), and low dust attenuation values. Their strong nebular emission lines and compact sizes (typically similar to 1.4 kpc) are consistent with the properties of the star-forming galaxies possibly responsible for reionizing the universe at z > 6. Many of the EELGs also exhibit Ly alpha emission. Additionally, we find that many of these sources are clustered in an overdensity in the Chandra Deep Field South, with five spectroscopically confirmed members at z=3.474 +/- 0.004. The spatial distribution and photometric redshifts of the ZFOURGE population further confirm the overdensity highlighted by the EELGs.
Keywords
EMISSION-LINE GALAXIES, HUBBLE-SPACE-TELESCOPE, STAR-FORMING GALAXIES, K-SELECTED GALAXIES, LY-ALPHA EMISSION, COSMIC REIONIZATION, PHYSICAL-PROPERTIES, FORMATION RATES, STELLAR MASSES, SKY SURVEY, galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: starburst, large-scale structure of universe, ultraviolet: galaxies

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MLA
Forrest, Ben, Kim-Vy H Tran, Adam Broussard, et al. “Discovery of Extreme [O III]+Hβ Emitting Galaxies Tracing an Overdensity at z ∼ 3.5 in CDF-South.” ASTROPHYSICAL JOURNAL LETTERS 838.1 (2017): n. pag. Print.
APA
Forrest, B., Tran, K.-V. H., Broussard, A., Allen, R. J., Apfel, M., Cowley, M. J., Glazebrook, K., et al. (2017). Discovery of extreme [O III]+Hβ emitting galaxies tracing an overdensity at z ∼ 3.5 in CDF-South. ASTROPHYSICAL JOURNAL LETTERS, 838(1).
Chicago author-date
Forrest, Ben, Kim-Vy H Tran, Adam Broussard, Rebecca J Allen, Miranda Apfel, Michael J Cowley, Karl Glazebrook, et al. 2017. “Discovery of Extreme [O III]+Hβ Emitting Galaxies Tracing an Overdensity at z ∼ 3.5 in CDF-South.” Astrophysical Journal Letters 838 (1).
Chicago author-date (all authors)
Forrest, Ben, Kim-Vy H Tran, Adam Broussard, Rebecca J Allen, Miranda Apfel, Michael J Cowley, Karl Glazebrook, Glenn G Kacprzak, Ivo Labbe, Themiya Nanayakkara, Casey Papovich, Ryan F Quadri, Lee R Spitler, Caroline Straatman, and Adam Tomczak. 2017. “Discovery of Extreme [O III]+Hβ Emitting Galaxies Tracing an Overdensity at z ∼ 3.5 in CDF-South.” Astrophysical Journal Letters 838 (1).
Vancouver
1.
Forrest B, Tran K-VH, Broussard A, Allen RJ, Apfel M, Cowley MJ, et al. Discovery of extreme [O III]+Hβ emitting galaxies tracing an overdensity at z ∼ 3.5 in CDF-South. ASTROPHYSICAL JOURNAL LETTERS. 2017;838(1).
IEEE
[1]
B. Forrest et al., “Discovery of extreme [O III]+Hβ emitting galaxies tracing an overdensity at z ∼ 3.5 in CDF-South,” ASTROPHYSICAL JOURNAL LETTERS, vol. 838, no. 1, 2017.
@article{8582602,
  abstract     = {Using deep multi-wavelength photometry of galaxies from ZFOURGE, we group galaxies at 2.5 < z < 4.0 by the shape of their spectral energy distributions (SEDs). We identify a population of galaxies with excess emission in the K-s-band, which corresponds to [O III]+H beta emission at 2.95 < z < 3.65. This population includes 78% of the bluest galaxies with UV slopes steeper than beta = -2. We de-redshift and scale this photometry to build two composite SEDs, enabling us to measure equivalent widths of these extreme [O III]+H beta emission line galaxies (EELGs) at z similar to 3.5. We identify 60 galaxies that comprise a composite SED with a [O III]+H beta rest-frame equivalent width of 803 +/- 228 angstrom and another 218 galaxies in a composite SED with an equivalent width of 230 +/- 90 angstrom. These EELGs are analogous to the "green peas" found in the SDSS and are thought to be undergoing their first burst of star formation due to their blue colors (beta < -1.6), young ages (log(age yr(-1))similar to 7.2), and low dust attenuation values. Their strong nebular emission lines and compact sizes (typically similar to 1.4 kpc) are consistent with the properties of the star-forming galaxies possibly responsible for reionizing the universe at z > 6. Many of the EELGs also exhibit Ly alpha emission. Additionally, we find that many of these sources are clustered in an overdensity in the Chandra Deep Field South, with five spectroscopically confirmed members at z=3.474 +/- 0.004. The spatial distribution and photometric redshifts of the ZFOURGE population further confirm the overdensity highlighted by the EELGs.},
  articleno    = {L12},
  author       = {Forrest, Ben and Tran, Kim-Vy H and Broussard, Adam and Allen, Rebecca J and Apfel, Miranda and Cowley, Michael J and Glazebrook, Karl and Kacprzak, Glenn G and Labbe, Ivo and Nanayakkara, Themiya and Papovich, Casey and Quadri, Ryan F and Spitler, Lee R and Straatman, Caroline and Tomczak, Adam},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keywords     = {EMISSION-LINE GALAXIES,HUBBLE-SPACE-TELESCOPE,STAR-FORMING GALAXIES,K-SELECTED GALAXIES,LY-ALPHA EMISSION,COSMIC REIONIZATION,PHYSICAL-PROPERTIES,FORMATION RATES,STELLAR MASSES,SKY SURVEY,galaxies: evolution,galaxies: formation,galaxies: high-redshift,galaxies: starburst,large-scale structure of universe,ultraviolet: galaxies},
  language     = {eng},
  number       = {1},
  pages        = {6},
  title        = {Discovery of extreme [O III]+Hβ emitting galaxies tracing an overdensity at z ∼ 3.5 in CDF-South},
  url          = {http://dx.doi.org/10.3847/2041-8213/aa653b},
  volume       = {838},
  year         = {2017},
}

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