Bright strongly lensed galaxies at redshift z 6-7 behind the clusters abell 1703 and CL0024+16

W. Zheng, L. D. Bradley, R. J. Bouwens, H. C. Ford, G. D. Illingworth, N. Benítez, T. Broadhurst, B. Frye, L. Infante, Myung Kook Jee, V. Motta, X. W. Shu, A. Zitrin

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Abstract

We report on the discovery of three bright, strongly lensed objects behind Abell 1703 and CL0024+16 from a dropout search over 25 arcmin2 of deep NICMOS data, with deep ACS optical coverage. They are undetected in the deep ACS images below 8500 and have clear detections in the J and H bands. Fits to the ACS, NICMOS, and IRAC data yield robust photometric redshifts in the range z 6-7 and largely rule out the possibility that they are low-redshift interlopers. All three objects are extended, and resolved into a pair of bright knots. The bright i-band dropout in Abell 1703 has an H-band AB magnitude of 23.9, which makes it one of the brightest known galaxy candidates at z > 5.5. Our model fits suggest a young, massive galaxy only 60 million years old with a mass of 1010 M . The dropout galaxy candidates behind CL0024+16 are separated by 25 (2 kpc in the source plane), and have H-band AB magnitudes of 25.0 and 25.6. Lensing models of CL0024+16 suggest that the objects have comparable intrinsic magnitudes of AB 27.3, approximately one magnitude fainter than L* at z 6.5. Their similar redshifts, spectral energy distribution, and luminosities, coupled with their very close proximity on the sky, suggest that they are spatially associated, and plausibly are physically bound. Combining this sample with two previously reported, similarly magnified galaxy candidates at z 6-8, we find that complex systems with dual nuclei may be a common feature of high-redshift galaxies.

Original languageEnglish
Pages (from-to)1907-1917
Number of pages11
JournalAstrophysical Journal
Volume697
Issue number2
DOIs
Publication statusPublished - 2009 Jan 1

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dropouts
galaxies
spectral energy distribution
complex systems
sky
proximity
luminosity
nuclei
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Zheng, W., Bradley, L. D., Bouwens, R. J., Ford, H. C., Illingworth, G. D., Benítez, N., ... Zitrin, A. (2009). Bright strongly lensed galaxies at redshift z 6-7 behind the clusters abell 1703 and CL0024+16. Astrophysical Journal, 697(2), 1907-1917. https://doi.org/10.1088/0004-637X/697/2/1907
Zheng, W. ; Bradley, L. D. ; Bouwens, R. J. ; Ford, H. C. ; Illingworth, G. D. ; Benítez, N. ; Broadhurst, T. ; Frye, B. ; Infante, L. ; Jee, Myung Kook ; Motta, V. ; Shu, X. W. ; Zitrin, A. / Bright strongly lensed galaxies at redshift z 6-7 behind the clusters abell 1703 and CL0024+16. In: Astrophysical Journal. 2009 ; Vol. 697, No. 2. pp. 1907-1917.
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abstract = "We report on the discovery of three bright, strongly lensed objects behind Abell 1703 and CL0024+16 from a dropout search over 25 arcmin2 of deep NICMOS data, with deep ACS optical coverage. They are undetected in the deep ACS images below 8500 and have clear detections in the J and H bands. Fits to the ACS, NICMOS, and IRAC data yield robust photometric redshifts in the range z 6-7 and largely rule out the possibility that they are low-redshift interlopers. All three objects are extended, and resolved into a pair of bright knots. The bright i-band dropout in Abell 1703 has an H-band AB magnitude of 23.9, which makes it one of the brightest known galaxy candidates at z > 5.5. Our model fits suggest a young, massive galaxy only 60 million years old with a mass of 1010 M ⊙. The dropout galaxy candidates behind CL0024+16 are separated by 25 (2 kpc in the source plane), and have H-band AB magnitudes of 25.0 and 25.6. Lensing models of CL0024+16 suggest that the objects have comparable intrinsic magnitudes of AB 27.3, approximately one magnitude fainter than L* at z 6.5. Their similar redshifts, spectral energy distribution, and luminosities, coupled with their very close proximity on the sky, suggest that they are spatially associated, and plausibly are physically bound. Combining this sample with two previously reported, similarly magnified galaxy candidates at z 6-8, we find that complex systems with dual nuclei may be a common feature of high-redshift galaxies.",
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Zheng, W, Bradley, LD, Bouwens, RJ, Ford, HC, Illingworth, GD, Benítez, N, Broadhurst, T, Frye, B, Infante, L, Jee, MK, Motta, V, Shu, XW & Zitrin, A 2009, 'Bright strongly lensed galaxies at redshift z 6-7 behind the clusters abell 1703 and CL0024+16', Astrophysical Journal, vol. 697, no. 2, pp. 1907-1917. https://doi.org/10.1088/0004-637X/697/2/1907

Bright strongly lensed galaxies at redshift z 6-7 behind the clusters abell 1703 and CL0024+16. / Zheng, W.; Bradley, L. D.; Bouwens, R. J.; Ford, H. C.; Illingworth, G. D.; Benítez, N.; Broadhurst, T.; Frye, B.; Infante, L.; Jee, Myung Kook; Motta, V.; Shu, X. W.; Zitrin, A.

In: Astrophysical Journal, Vol. 697, No. 2, 01.01.2009, p. 1907-1917.

Research output: Contribution to journalArticle

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T1 - Bright strongly lensed galaxies at redshift z 6-7 behind the clusters abell 1703 and CL0024+16

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AU - Bradley, L. D.

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AU - Benítez, N.

AU - Broadhurst, T.

AU - Frye, B.

AU - Infante, L.

AU - Jee, Myung Kook

AU - Motta, V.

AU - Shu, X. W.

AU - Zitrin, A.

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N2 - We report on the discovery of three bright, strongly lensed objects behind Abell 1703 and CL0024+16 from a dropout search over 25 arcmin2 of deep NICMOS data, with deep ACS optical coverage. They are undetected in the deep ACS images below 8500 and have clear detections in the J and H bands. Fits to the ACS, NICMOS, and IRAC data yield robust photometric redshifts in the range z 6-7 and largely rule out the possibility that they are low-redshift interlopers. All three objects are extended, and resolved into a pair of bright knots. The bright i-band dropout in Abell 1703 has an H-band AB magnitude of 23.9, which makes it one of the brightest known galaxy candidates at z > 5.5. Our model fits suggest a young, massive galaxy only 60 million years old with a mass of 1010 M ⊙. The dropout galaxy candidates behind CL0024+16 are separated by 25 (2 kpc in the source plane), and have H-band AB magnitudes of 25.0 and 25.6. Lensing models of CL0024+16 suggest that the objects have comparable intrinsic magnitudes of AB 27.3, approximately one magnitude fainter than L* at z 6.5. Their similar redshifts, spectral energy distribution, and luminosities, coupled with their very close proximity on the sky, suggest that they are spatially associated, and plausibly are physically bound. Combining this sample with two previously reported, similarly magnified galaxy candidates at z 6-8, we find that complex systems with dual nuclei may be a common feature of high-redshift galaxies.

AB - We report on the discovery of three bright, strongly lensed objects behind Abell 1703 and CL0024+16 from a dropout search over 25 arcmin2 of deep NICMOS data, with deep ACS optical coverage. They are undetected in the deep ACS images below 8500 and have clear detections in the J and H bands. Fits to the ACS, NICMOS, and IRAC data yield robust photometric redshifts in the range z 6-7 and largely rule out the possibility that they are low-redshift interlopers. All three objects are extended, and resolved into a pair of bright knots. The bright i-band dropout in Abell 1703 has an H-band AB magnitude of 23.9, which makes it one of the brightest known galaxy candidates at z > 5.5. Our model fits suggest a young, massive galaxy only 60 million years old with a mass of 1010 M ⊙. The dropout galaxy candidates behind CL0024+16 are separated by 25 (2 kpc in the source plane), and have H-band AB magnitudes of 25.0 and 25.6. Lensing models of CL0024+16 suggest that the objects have comparable intrinsic magnitudes of AB 27.3, approximately one magnitude fainter than L* at z 6.5. Their similar redshifts, spectral energy distribution, and luminosities, coupled with their very close proximity on the sky, suggest that they are spatially associated, and plausibly are physically bound. Combining this sample with two previously reported, similarly magnified galaxy candidates at z 6-8, we find that complex systems with dual nuclei may be a common feature of high-redshift galaxies.

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Zheng W, Bradley LD, Bouwens RJ, Ford HC, Illingworth GD, Benítez N et al. Bright strongly lensed galaxies at redshift z 6-7 behind the clusters abell 1703 and CL0024+16. Astrophysical Journal. 2009 Jan 1;697(2):1907-1917. https://doi.org/10.1088/0004-637X/697/2/1907