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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, PA Oesch, I Labbe, et al. “The Bright End of the z ∼ 9 and z ∼ 10 UV Luminosity Functions Using All Five CANDELS Fields.” ASTROPHYSICAL JOURNAL 830.2 (2016): n. pag. Print.
APA
Bouwens, R., Oesch, P., Labbe, I., Illingworth, G., Fazio, G., Coe, D., Holwerda, B., 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).
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).
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).
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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