Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218

E. Egami; J. P. Kneib; G. H. Rleke; R. S. Ellis; J. Richard; J. Rigby; C. Papovich; D. Stark; M. R. Santos; J. S. Huang; H. Dole; E. Le Floc'h; P. G. Pérez-González

doi:10.1086/427550

Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218

E. Egami, J. P. Kneib, G. H. Rleke, R. S. Ellis, J. Richard, J. Rigby, C. Papovich, D. Stark, M. R. Santos, J. S. Huang, H. Dole, E. Le Floc'h, P. G. Pérez-González

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Abstract

We report the detection of a z ∼ 7 galaxy strongly lensed by the massive galaxy cluster A2218 (z = 0.175) at 3.6 and 4.5 μm using the Spitzer Space Telescope and at 1.1 μm using the Hubble Space Telescope. The new data indicate a refined photometric redshift in the range of 6.6-6.8 depending on the presence of Lyα emission. The spectral energy distribution is consistent with having a significant Balmer break, suggesting that the galaxy is in the poststarburst stage with an age of at least ∼50 Myr and quite possibly a few hundred million years. This suggests the possibility that a mature stellar population is already in place at such a high redshift. Compared with typical Lyman break galaxies at z ∼ 3-4, the stellar mass is an order of magnitude smaller (∼10⁹ M_⊙), but the specific star formation rate (star formation rate/M/_star) is similarly large (>10^-9yr^-1), indicating equally vigorous star-forming activity.

Original language	English (US)
Pages (from-to)	L5-L8
Journal	Astrophysical Journal
Volume	618
Issue number	1 II
DOIs	https://doi.org/10.1086/427550
State	Published - Jan 1 2005

Keywords

Cosmology: observations
Galaxies: evolution
Galaxies: formation
Galaxies: high-redshift
Gravitational lensing

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/427550

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Egami, E., Kneib, J. P., Rleke, G. H., Ellis, R. S., Richard, J., Rigby, J., Papovich, C., Stark, D., Santos, M. R., Huang, J. S., Dole, H., Floc'h, E. L., & Pérez-González, P. G. (2005). Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218. Astrophysical Journal, 618(1 II), L5-L8. https://doi.org/10.1086/427550

@article{688806fe93a849d1a513216478bf6c50,

title = "Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218",

abstract = "We report the detection of a z ∼ 7 galaxy strongly lensed by the massive galaxy cluster A2218 (z = 0.175) at 3.6 and 4.5 μm using the Spitzer Space Telescope and at 1.1 μm using the Hubble Space Telescope. The new data indicate a refined photometric redshift in the range of 6.6-6.8 depending on the presence of Lyα emission. The spectral energy distribution is consistent with having a significant Balmer break, suggesting that the galaxy is in the poststarburst stage with an age of at least ∼50 Myr and quite possibly a few hundred million years. This suggests the possibility that a mature stellar population is already in place at such a high redshift. Compared with typical Lyman break galaxies at z ∼ 3-4, the stellar mass is an order of magnitude smaller (∼109 M⊙), but the specific star formation rate (star formation rate/M/star) is similarly large (>10-9yr-1), indicating equally vigorous star-forming activity.",

keywords = "Cosmology: observations, Galaxies: evolution, Galaxies: formation, Galaxies: high-redshift, Gravitational lensing",

author = "E. Egami and Kneib, {J. P.} and Rleke, {G. H.} and Ellis, {R. S.} and J. Richard and J. Rigby and C. Papovich and D. Stark and Santos, {M. R.} and Huang, {J. S.} and H. Dole and Floc'h, {E. Le} and P{\'e}rez-Gonz{\'a}lez, {P. G.}",

note = "Funding Information: We acknowledge helpful discussions with G. Smith, D. Stern, R. Pell{\'o}, and D. Schaerer and thank G. Neugebauer for commenting on the manuscript. J.-P. K. acknowledges support from Caltech and CNRS. The study of A2218 as a cosmic lens is supported by NASA STScI grant HST-GO-09452.01-A.",

year = "2005",

month = jan,

day = "1",

doi = "10.1086/427550",

language = "English (US)",

volume = "618",

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publisher = "American Astronomical Society",

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TY - JOUR

T1 - Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218

AU - Egami, E.

AU - Kneib, J. P.

AU - Rleke, G. H.

AU - Ellis, R. S.

AU - Richard, J.

AU - Rigby, J.

AU - Papovich, C.

AU - Stark, D.

AU - Santos, M. R.

AU - Huang, J. S.

AU - Dole, H.

AU - Floc'h, E. Le

AU - Pérez-González, P. G.

N1 - Funding Information: We acknowledge helpful discussions with G. Smith, D. Stern, R. Pelló, and D. Schaerer and thank G. Neugebauer for commenting on the manuscript. J.-P. K. acknowledges support from Caltech and CNRS. The study of A2218 as a cosmic lens is supported by NASA STScI grant HST-GO-09452.01-A.

PY - 2005/1/1

Y1 - 2005/1/1

N2 - We report the detection of a z ∼ 7 galaxy strongly lensed by the massive galaxy cluster A2218 (z = 0.175) at 3.6 and 4.5 μm using the Spitzer Space Telescope and at 1.1 μm using the Hubble Space Telescope. The new data indicate a refined photometric redshift in the range of 6.6-6.8 depending on the presence of Lyα emission. The spectral energy distribution is consistent with having a significant Balmer break, suggesting that the galaxy is in the poststarburst stage with an age of at least ∼50 Myr and quite possibly a few hundred million years. This suggests the possibility that a mature stellar population is already in place at such a high redshift. Compared with typical Lyman break galaxies at z ∼ 3-4, the stellar mass is an order of magnitude smaller (∼109 M⊙), but the specific star formation rate (star formation rate/M/star) is similarly large (>10-9yr-1), indicating equally vigorous star-forming activity.

AB - We report the detection of a z ∼ 7 galaxy strongly lensed by the massive galaxy cluster A2218 (z = 0.175) at 3.6 and 4.5 μm using the Spitzer Space Telescope and at 1.1 μm using the Hubble Space Telescope. The new data indicate a refined photometric redshift in the range of 6.6-6.8 depending on the presence of Lyα emission. The spectral energy distribution is consistent with having a significant Balmer break, suggesting that the galaxy is in the poststarburst stage with an age of at least ∼50 Myr and quite possibly a few hundred million years. This suggests the possibility that a mature stellar population is already in place at such a high redshift. Compared with typical Lyman break galaxies at z ∼ 3-4, the stellar mass is an order of magnitude smaller (∼109 M⊙), but the specific star formation rate (star formation rate/M/star) is similarly large (>10-9yr-1), indicating equally vigorous star-forming activity.

KW - Cosmology: observations

KW - Galaxies: evolution

KW - Galaxies: formation

KW - Galaxies: high-redshift

KW - Gravitational lensing

UR - http://www.scopus.com/inward/record.url?scp=13944250316&partnerID=8YFLogxK

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U2 - 10.1086/427550

DO - 10.1086/427550

M3 - Article

AN - SCOPUS:13944250316

SN - 0004-637X

VL - 618

SP - L5-L8

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218

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Keywords

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