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Spectroscopy of z ∼ 6 i-dropout galaxies : frequency of Lyα emission and the sizes of Lyα-emitting galaxies

(2007) ASTROPHYSICAL JOURNAL. 660(1). p.47-61
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Abstract
We report on deep spectroscopy, using LRIS on Keck I and FORS2 on the VLT, of a sample of 22 candidate z similar to 6 Lyman break galaxies (LBGs) selected by the (i)775 - z(850) > 1: 3 dropout criterion. Redshifts could be measured for eight objects. These redshifts are all in the range z = 5: 5-6.1, confirming the efficiency of the i775 - z850 color selection technique. Six of the confirmed galaxies show Ly alpha emission. Assuming that the 14 objects without redshifts are z similar to 6 LBGs that lack detectable Ly alpha emission lines, we infer that the fraction of Ly alpha-emitting LBGs with Ly alpha equivalent widths greater than 20 angstrom among z similar to 6 LBGs is approximate to 30%, similar to that found at z similar to 3. Every Ly alpha-emitting object in our sample is compact, with half-light radii r(hl) <= 0:14". Furthermore, all the Ly alpha-emitting objects in our sample are more compact than average relative to the observed size-magnitude relation of a large i-dropout sample (332 candidate z similar to 6 objects). We can reject the hypothesis that the Ly alpha-emitting population is a subset of the rest of the z similar to 6 LBG population at > 97% confidence. We speculate that the small sizes of the Ly alpha-emitting LBGs are due to these objects being less massive than other LBGs at z similar to 6.
Keywords
LYMAN-BREAK GALAXIES, SUBARU DEEP FIELD, FRAME ULTRAVIOLET-SPECTRA, HIGH-REDSHIFT GALAXIES, DIGITAL SKY SURVEY, GOODS-SOUTH FIELD, STAR-FORMATION, LUMINOSITY FUNCTION, SPECTROPHOTOMETRIC STANDARDS, VLT/FORS2 SPECTROSCOPY

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Citation

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MLA
Dow-Hygelund, CC, BP Holden, RJ Bouwens, et al. “Spectroscopy of z ∼ 6 I-dropout Galaxies : Frequency of Lyα Emission and the Sizes of Lyα-emitting Galaxies.” ASTROPHYSICAL JOURNAL 660.1 (2007): 47–61. Print.
APA
Dow-Hygelund, C., Holden, B., Bouwens, R., Illingworth, G., van der Wel, A., Franx, M., van Dokkum, P., et al. (2007). Spectroscopy of z ∼ 6 i-dropout galaxies : frequency of Lyα emission and the sizes of Lyα-emitting galaxies. ASTROPHYSICAL JOURNAL, 660(1), 47–61.
Chicago author-date
Dow-Hygelund, CC, BP Holden, RJ Bouwens, GD Illingworth, Arjen van der Wel, M Franx, PG van Dokkum, et al. 2007. “Spectroscopy of z ∼ 6 I-dropout Galaxies : Frequency of Lyα Emission and the Sizes of Lyα-emitting Galaxies.” Astrophysical Journal 660 (1): 47–61.
Chicago author-date (all authors)
Dow-Hygelund, CC, BP Holden, RJ Bouwens, GD Illingworth, Arjen van der Wel, M Franx, PG van Dokkum, H Ford, P Rosati, D Magee, and A Zirm. 2007. “Spectroscopy of z ∼ 6 I-dropout Galaxies : Frequency of Lyα Emission and the Sizes of Lyα-emitting Galaxies.” Astrophysical Journal 660 (1): 47–61.
Vancouver
1.
Dow-Hygelund C, Holden B, Bouwens R, Illingworth G, van der Wel A, Franx M, et al. Spectroscopy of z ∼ 6 i-dropout galaxies : frequency of Lyα emission and the sizes of Lyα-emitting galaxies. ASTROPHYSICAL JOURNAL. 2007;660(1):47–61.
IEEE
[1]
C. Dow-Hygelund et al., “Spectroscopy of z ∼ 6 i-dropout galaxies : frequency of Lyα emission and the sizes of Lyα-emitting galaxies,” ASTROPHYSICAL JOURNAL, vol. 660, no. 1, pp. 47–61, 2007.
@article{8575478,
  abstract     = {We report on deep spectroscopy, using LRIS on Keck I and FORS2 on the VLT, of a sample of 22 candidate z similar to 6 Lyman break galaxies (LBGs) selected by the (i)775 - z(850) > 1: 3 dropout criterion. Redshifts could be measured for eight objects. These redshifts are all in the range z = 5: 5-6.1, confirming the efficiency of the i775 - z850 color selection technique. Six of the confirmed galaxies show Ly alpha emission. Assuming that the 14 objects without redshifts are z similar to 6 LBGs that lack detectable Ly alpha emission lines, we infer that the fraction of Ly alpha-emitting LBGs with Ly alpha equivalent widths greater than 20 angstrom among z similar to 6 LBGs is approximate to 30%, similar to that found at z similar to 3. Every Ly alpha-emitting object in our sample is compact, with half-light radii r(hl) <= 0:14". Furthermore, all the Ly alpha-emitting objects in our sample are more compact than average relative to the observed size-magnitude relation of a large i-dropout sample (332 candidate z similar to 6 objects). We can reject the hypothesis that the Ly alpha-emitting population is a subset of the rest of the z similar to 6 LBG population at > 97% confidence. We speculate that the small sizes of the Ly alpha-emitting LBGs are due to these objects being less massive than other LBGs at z similar to 6.},
  author       = {Dow-Hygelund, CC and Holden, BP and Bouwens, RJ and Illingworth, GD and van der Wel, Arjen and Franx, M and van Dokkum, PG and Ford, H and Rosati, P and Magee, D and Zirm, A},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {LYMAN-BREAK GALAXIES,SUBARU DEEP FIELD,FRAME ULTRAVIOLET-SPECTRA,HIGH-REDSHIFT GALAXIES,DIGITAL SKY SURVEY,GOODS-SOUTH FIELD,STAR-FORMATION,LUMINOSITY FUNCTION,SPECTROPHOTOMETRIC STANDARDS,VLT/FORS2 SPECTROSCOPY},
  language     = {eng},
  number       = {1},
  pages        = {47--61},
  title        = {Spectroscopy of z ∼ 6 i-dropout galaxies : frequency of Lyα emission and the sizes of Lyα-emitting galaxies},
  url          = {http://dx.doi.org/10.1086/512025},
  volume       = {660},
  year         = {2007},
}

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