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The bright end of the z ∼ 9 and z ∼ 10 UV luminosity functions using all five CANDELS fields

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Abstract
The deep, wide-area (similar to 800-900 arcmin(2)) near-infrared/WFC3/IR + Spitzer/IRAC observations over the CANDELS fields have been a remarkable resource for constraining the bright end of high-redshift UV luminosity functions. However, the lack of Hubble Space Telescope (HST) 1.05 mu m observations over the CANDELS fields has made it difficult to identify z similar to 9-10 sources robustly, since such data are needed to confirm the presence of an abrupt Lyman break at 1.2 mu m. Here, we report on the successful identification of many such z similar to 9-10 sources from a new HST program (z9-CANDELS) that targets the highest-probability z similar to 9-10 galaxy candidates with observations at 1.05 mu m, to search for a robust Lyman-break at 1.2 mu m. The potential z similar to 9-10 candidates were preselected from the full HST, Spitzer/IRAC S-CANDELS observations, and the deepest-available ground-based optical+near-infrared observations (CFHTLS-DEEP+HUGS+UltraVISTA+ZFOURGE). We identified 15 credible z similar to 9-10 galaxies over the CANDELS fields. Nine of these galaxies lie at z similar to 9 and five are new identifications. Our targeted follow-up strategy has proven to be very efficient in making use of scarce HST time to secure a reliable sample of z similar to 9-10 galaxies. Through extensive simulations, we replicate the selection process for our sample (both the preselection and follow-up) and use it to improve current estimates for the volume density of bright z similar to 9 and z similar to 10 galaxies. The volume densities we find are 5(-2)(+3)x and 8(-3)(+9)x lower, respectively, than those found at z similar to 8. When compared with the best-fit evolution (i.e., d log(10) rho(UV)/dz = -0.29 +/- 0.02) in the UV luminosity densities from z similar to 8 to z similar to 4 integrated to 0.3L(z=3)* (-20 mag), these luminosity densities are 2.6(-0.9)(+1.5)x and 2.2(-1.1)(+2.0) lower, respectively, than the extrapolated trends. Our new results are broadly consistent with the "accelerated evolution" scenario at z > 8, consistent with that seen in many models.
Keywords
ULTRA-DEEP FIELD, HUBBLE-SPACE-TELESCOPE, STAR-FORMATION RATE, FORMATION, RATE DENSITY, EARLY RELEASE SCIENCE, LYMAN-BREAK GALAXIES, EXTRAGALACTIC, LEGACY SURVEY, HIGH-REDSHIFT GALAXIES, SURVEY. SURVEY DESIGN, IRAC, SOURCE COUNTS, galaxies: formation, galaxies: high-redshift

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MLA
Bouwens, RJ, et al. “The Bright End of the z ∼ 9 and z ∼ 10 UV Luminosity Functions Using All Five CANDELS Fields.” ASTROPHYSICAL JOURNAL, vol. 830, no. 2, 2016, doi:10.3847/0004-637X/830/2/67.
APA
Bouwens, R., Oesch, P., Labbe, I., Illingworth, G., Fazio, G., Coe, D., … Magee, D. (2016). The bright end of the z ∼ 9 and z ∼ 10 UV luminosity functions using all five CANDELS fields. ASTROPHYSICAL JOURNAL, 830(2). https://doi.org/10.3847/0004-637X/830/2/67
Chicago author-date
Bouwens, RJ, PA Oesch, I Labbe, GD Illingworth, GG Fazio, D Coe, B Holwerda, et al. 2016. “The Bright End of the z ∼ 9 and z ∼ 10 UV Luminosity Functions Using All Five CANDELS Fields.” ASTROPHYSICAL JOURNAL 830 (2). https://doi.org/10.3847/0004-637X/830/2/67.
Chicago author-date (all authors)
Bouwens, RJ, PA Oesch, I Labbe, GD Illingworth, GG Fazio, D Coe, B Holwerda, R Smit, M Stefanon, PG van Dokkum, M Trenti, MLN Ashby, J-S Huang, L Spitler, Caroline Straatman, L Bradley, and D Magee. 2016. “The Bright End of the z ∼ 9 and z ∼ 10 UV Luminosity Functions Using All Five CANDELS Fields.” ASTROPHYSICAL JOURNAL 830 (2). doi:10.3847/0004-637X/830/2/67.
Vancouver
1.
Bouwens R, Oesch P, Labbe I, Illingworth G, Fazio G, Coe D, et al. The bright end of the z ∼ 9 and z ∼ 10 UV luminosity functions using all five CANDELS fields. ASTROPHYSICAL JOURNAL. 2016;830(2).
IEEE
[1]
R. Bouwens et al., “The bright end of the z ∼ 9 and z ∼ 10 UV luminosity functions using all five CANDELS fields,” ASTROPHYSICAL JOURNAL, vol. 830, no. 2, 2016.
@article{8582606,
  abstract     = {{The deep, wide-area (similar to 800-900 arcmin(2)) near-infrared/WFC3/IR + Spitzer/IRAC observations over the CANDELS fields have been a remarkable resource for constraining the bright end of high-redshift UV luminosity functions. However, the lack of Hubble Space Telescope (HST) 1.05 mu m observations over the CANDELS fields has made it difficult to identify z similar to 9-10 sources robustly, since such data are needed to confirm the presence of an abrupt Lyman break at 1.2 mu m. Here, we report on the successful identification of many such z similar to 9-10 sources from a new HST program (z9-CANDELS) that targets the highest-probability z similar to 9-10 galaxy candidates with observations at 1.05 mu m, to search for a robust Lyman-break at 1.2 mu m. The potential z similar to 9-10 candidates were preselected from the full HST, Spitzer/IRAC S-CANDELS observations, and the deepest-available ground-based optical+near-infrared observations (CFHTLS-DEEP+HUGS+UltraVISTA+ZFOURGE). We identified 15 credible z similar to 9-10 galaxies over the CANDELS fields. Nine of these galaxies lie at z similar to 9 and five are new identifications. Our targeted follow-up strategy has proven to be very efficient in making use of scarce HST time to secure a reliable sample of z similar to 9-10 galaxies. Through extensive simulations, we replicate the selection process for our sample (both the preselection and follow-up) and use it to improve current estimates for the volume density of bright z similar to 9 and z similar to 10 galaxies. The volume densities we find are 5(-2)(+3)x and 8(-3)(+9)x lower, respectively, than those found at z similar to 8. When compared with the best-fit evolution (i.e., d log(10) rho(UV)/dz = -0.29 +/- 0.02) in the UV luminosity densities from z similar to 8 to z similar to 4 integrated to 0.3L(z=3)* (-20 mag), these luminosity densities are 2.6(-0.9)(+1.5)x and 2.2(-1.1)(+2.0) lower, respectively, than the extrapolated trends. Our new results are broadly consistent with the "accelerated evolution" scenario at z > 8, consistent with that seen in many models.}},
  articleno    = {{67}},
  author       = {{Bouwens, RJ and Oesch, PA and Labbe, I and Illingworth, GD and Fazio, GG and Coe, D and Holwerda, B and Smit, R and Stefanon, M and van Dokkum, PG and Trenti, M and Ashby, MLN and Huang, J-S and Spitler, L and Straatman, Caroline and Bradley, L and Magee, D}},
  issn         = {{0004-637X}},
  journal      = {{ASTROPHYSICAL JOURNAL}},
  keywords     = {{ULTRA-DEEP FIELD,HUBBLE-SPACE-TELESCOPE,STAR-FORMATION RATE,FORMATION,RATE DENSITY,EARLY RELEASE SCIENCE,LYMAN-BREAK GALAXIES,EXTRAGALACTIC,LEGACY SURVEY,HIGH-REDSHIFT GALAXIES,SURVEY. SURVEY DESIGN,IRAC,SOURCE COUNTS,galaxies: formation,galaxies: high-redshift}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{22}},
  title        = {{The bright end of the z ∼ 9 and z ∼ 10 UV luminosity functions using all five CANDELS fields}},
  url          = {{http://dx.doi.org/10.3847/0004-637X/830/2/67}},
  volume       = {{830}},
  year         = {{2016}},
}

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