Discovery of a very bright strongly lensed galaxy candidate at z ≈ 7.6

L. D. Bradley, R. J. Bouwens, H. C. Ford, G. D. Illingworth, M. J. Jee, N. Benítez, T. J. Broadhurst, M. Franx, Brenda Louise Frye, L. Infante, V. Motta, P. Rosati, R. L. White, W. Zheng

Research output: Contribution to journalArticle

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Abstract

Using Hubble Space Telescope (HST) and Spitzer IRAC imaging, we report the discovery of a very bright strongly lensed Lyman break galaxy (LBG) candidate atz ∼ 7.6 in the field of the massive galaxy cluster Abell 1689 (z = 0.18). The galaxy candidate, which we refer to as A1689-zD1, shows a strong z 850 - J110 break of at least 2.2 mag and is completely undetected (<1 σ) in HST Advanced Camera for Surveys (ACS) g 475, r625, i775, and Z850 data. These properties, combined with the very blue J110 - H160 and H160 - [4.5 μ] colors, are exactly the properties of an z ∼ 7.6 LBG, and can only be reasonably fit by a star-forming galaxy at z = 7.6 ± 0.4 (χv2 = 1.1). Attempts to reproduce these properties with a model galaxy at z < 4 yield particularly poor fits (χv2 ≥ 25). A1689-zD1 has an observed (lensed) magnitude of 24.7 AB (8 σ) in the NICMOS H160 band and is ∼1.3 mag brighter than the brightest known z850-dropout galaxy. When corrected for the cluster magnification of ∼9.3 at z ∼ 7.6, the candidate has an intrinsic magnitude of H160 = 27.1 AB, or about an L* galaxy atz ∼ 7.6. The source-plane deprojection shows that the star formation is occurring in compact knots of size ≲300 pc. The best-fit stellar population synthesis models yield a median redshift of 7.6, stellar masses (1.6-3.9) × 109 M, stellar ages 45-320 Myr, star formation rates ≲7.6 M yr_1, and low reddening with Av ≤; 0.3. These properties are generally similar to those of LBGs found atz ∼ 5-6. The inferred stellar ages suggest a formation redshift of z ∼ 8-10 (t ≲ 0.63 Gyr). A1689-zD1 is the brightest observed, highly reliable z > 7.0 galaxy candidate found to date.

Original languageEnglish (US)
Pages (from-to)647-654
Number of pages8
JournalAstrophysical Journal
Volume678
Issue number2
DOIs
StatePublished - May 10 2008
Externally publishedYes

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galaxies
Hubble Space Telescope

Keywords

  • Cosmology: observations
  • Galaxies: evolution
  • Galaxies: formation galaxies: high-redshift

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Bradley, L. D., Bouwens, R. J., Ford, H. C., Illingworth, G. D., Jee, M. J., Benítez, N., ... Zheng, W. (2008). Discovery of a very bright strongly lensed galaxy candidate at z ≈ 7.6. Astrophysical Journal, 678(2), 647-654. https://doi.org/10.1086/533519

Discovery of a very bright strongly lensed galaxy candidate at z ≈ 7.6. / Bradley, L. D.; Bouwens, R. J.; Ford, H. C.; Illingworth, G. D.; Jee, M. J.; Benítez, N.; Broadhurst, T. J.; Franx, M.; Frye, Brenda Louise; Infante, L.; Motta, V.; Rosati, P.; White, R. L.; Zheng, W.

In: Astrophysical Journal, Vol. 678, No. 2, 10.05.2008, p. 647-654.

Research output: Contribution to journalArticle

Bradley, LD, Bouwens, RJ, Ford, HC, Illingworth, GD, Jee, MJ, Benítez, N, Broadhurst, TJ, Franx, M, Frye, BL, Infante, L, Motta, V, Rosati, P, White, RL & Zheng, W 2008, 'Discovery of a very bright strongly lensed galaxy candidate at z ≈ 7.6', Astrophysical Journal, vol. 678, no. 2, pp. 647-654. https://doi.org/10.1086/533519
Bradley LD, Bouwens RJ, Ford HC, Illingworth GD, Jee MJ, Benítez N et al. Discovery of a very bright strongly lensed galaxy candidate at z ≈ 7.6. Astrophysical Journal. 2008 May 10;678(2):647-654. https://doi.org/10.1086/533519
Bradley, L. D. ; Bouwens, R. J. ; Ford, H. C. ; Illingworth, G. D. ; Jee, M. J. ; Benítez, N. ; Broadhurst, T. J. ; Franx, M. ; Frye, Brenda Louise ; Infante, L. ; Motta, V. ; Rosati, P. ; White, R. L. ; Zheng, W. / Discovery of a very bright strongly lensed galaxy candidate at z ≈ 7.6. In: Astrophysical Journal. 2008 ; Vol. 678, No. 2. pp. 647-654.
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abstract = "Using Hubble Space Telescope (HST) and Spitzer IRAC imaging, we report the discovery of a very bright strongly lensed Lyman break galaxy (LBG) candidate atz ∼ 7.6 in the field of the massive galaxy cluster Abell 1689 (z = 0.18). The galaxy candidate, which we refer to as A1689-zD1, shows a strong z 850 - J110 break of at least 2.2 mag and is completely undetected (<1 σ) in HST Advanced Camera for Surveys (ACS) g 475, r625, i775, and Z850 data. These properties, combined with the very blue J110 - H160 and H160 - [4.5 μ] colors, are exactly the properties of an z ∼ 7.6 LBG, and can only be reasonably fit by a star-forming galaxy at z = 7.6 ± 0.4 (χv2 = 1.1). Attempts to reproduce these properties with a model galaxy at z < 4 yield particularly poor fits (χv2 ≥ 25). A1689-zD1 has an observed (lensed) magnitude of 24.7 AB (8 σ) in the NICMOS H160 band and is ∼1.3 mag brighter than the brightest known z850-dropout galaxy. When corrected for the cluster magnification of ∼9.3 at z ∼ 7.6, the candidate has an intrinsic magnitude of H160 = 27.1 AB, or about an L* galaxy atz ∼ 7.6. The source-plane deprojection shows that the star formation is occurring in compact knots of size ≲300 pc. The best-fit stellar population synthesis models yield a median redshift of 7.6, stellar masses (1.6-3.9) × 109 M⊙, stellar ages 45-320 Myr, star formation rates ≲7.6 M⊙ yr_1, and low reddening with Av ≤; 0.3. These properties are generally similar to those of LBGs found atz ∼ 5-6. The inferred stellar ages suggest a formation redshift of z ∼ 8-10 (t ≲ 0.63 Gyr). A1689-zD1 is the brightest observed, highly reliable z > 7.0 galaxy candidate found to date.",
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AU - Jee, M. J.

AU - Benítez, N.

AU - Broadhurst, T. J.

AU - Franx, M.

AU - Frye, Brenda Louise

AU - Infante, L.

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AU - White, R. L.

AU - Zheng, W.

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N2 - Using Hubble Space Telescope (HST) and Spitzer IRAC imaging, we report the discovery of a very bright strongly lensed Lyman break galaxy (LBG) candidate atz ∼ 7.6 in the field of the massive galaxy cluster Abell 1689 (z = 0.18). The galaxy candidate, which we refer to as A1689-zD1, shows a strong z 850 - J110 break of at least 2.2 mag and is completely undetected (<1 σ) in HST Advanced Camera for Surveys (ACS) g 475, r625, i775, and Z850 data. These properties, combined with the very blue J110 - H160 and H160 - [4.5 μ] colors, are exactly the properties of an z ∼ 7.6 LBG, and can only be reasonably fit by a star-forming galaxy at z = 7.6 ± 0.4 (χv2 = 1.1). Attempts to reproduce these properties with a model galaxy at z < 4 yield particularly poor fits (χv2 ≥ 25). A1689-zD1 has an observed (lensed) magnitude of 24.7 AB (8 σ) in the NICMOS H160 band and is ∼1.3 mag brighter than the brightest known z850-dropout galaxy. When corrected for the cluster magnification of ∼9.3 at z ∼ 7.6, the candidate has an intrinsic magnitude of H160 = 27.1 AB, or about an L* galaxy atz ∼ 7.6. The source-plane deprojection shows that the star formation is occurring in compact knots of size ≲300 pc. The best-fit stellar population synthesis models yield a median redshift of 7.6, stellar masses (1.6-3.9) × 109 M⊙, stellar ages 45-320 Myr, star formation rates ≲7.6 M⊙ yr_1, and low reddening with Av ≤; 0.3. These properties are generally similar to those of LBGs found atz ∼ 5-6. The inferred stellar ages suggest a formation redshift of z ∼ 8-10 (t ≲ 0.63 Gyr). A1689-zD1 is the brightest observed, highly reliable z > 7.0 galaxy candidate found to date.

AB - Using Hubble Space Telescope (HST) and Spitzer IRAC imaging, we report the discovery of a very bright strongly lensed Lyman break galaxy (LBG) candidate atz ∼ 7.6 in the field of the massive galaxy cluster Abell 1689 (z = 0.18). The galaxy candidate, which we refer to as A1689-zD1, shows a strong z 850 - J110 break of at least 2.2 mag and is completely undetected (<1 σ) in HST Advanced Camera for Surveys (ACS) g 475, r625, i775, and Z850 data. These properties, combined with the very blue J110 - H160 and H160 - [4.5 μ] colors, are exactly the properties of an z ∼ 7.6 LBG, and can only be reasonably fit by a star-forming galaxy at z = 7.6 ± 0.4 (χv2 = 1.1). Attempts to reproduce these properties with a model galaxy at z < 4 yield particularly poor fits (χv2 ≥ 25). A1689-zD1 has an observed (lensed) magnitude of 24.7 AB (8 σ) in the NICMOS H160 band and is ∼1.3 mag brighter than the brightest known z850-dropout galaxy. When corrected for the cluster magnification of ∼9.3 at z ∼ 7.6, the candidate has an intrinsic magnitude of H160 = 27.1 AB, or about an L* galaxy atz ∼ 7.6. The source-plane deprojection shows that the star formation is occurring in compact knots of size ≲300 pc. The best-fit stellar population synthesis models yield a median redshift of 7.6, stellar masses (1.6-3.9) × 109 M⊙, stellar ages 45-320 Myr, star formation rates ≲7.6 M⊙ yr_1, and low reddening with Av ≤; 0.3. These properties are generally similar to those of LBGs found atz ∼ 5-6. The inferred stellar ages suggest a formation redshift of z ∼ 8-10 (t ≲ 0.63 Gyr). A1689-zD1 is the brightest observed, highly reliable z > 7.0 galaxy candidate found to date.

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