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, Daniel P Stark, M. R. Santos, J. S. Huang, H. Dole, E. Le Floc'h, P. G. Pérez-González

Research output: Contribution to journalArticle

83 Citations (Scopus)

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 languageEnglish (US)
JournalAstrophysical Journal
Volume618
Issue number1 II
DOIs
StatePublished - Jan 1 2005
Externally publishedYes

Fingerprint

Space Infrared Telescope Facility
Hubble Space Telescope
physical property
physical properties
galaxies
star formation rate
M stars
spectral energy distribution
stellar mass
energy
stars
rate
detection
distribution

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Egami, E., Kneib, J. P., Rleke, G. H., Ellis, R. S., Richard, J., Rigby, J., ... 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). https://doi.org/10.1086/427550

Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218. / Egami, E.; Kneib, J. P.; Rleke, G. H.; Ellis, R. S.; Richard, J.; Rigby, J.; Papovich, C.; Stark, Daniel P; Santos, M. R.; Huang, J. S.; Dole, H.; Floc'h, E. Le; Pérez-González, P. G.

In: Astrophysical Journal, Vol. 618, No. 1 II, 01.01.2005.

Research output: Contribution to journalArticle

Egami, E, Kneib, JP, Rleke, GH, Ellis, RS, Richard, J, Rigby, J, Papovich, C, Stark, DP, Santos, MR, Huang, JS, Dole, H, Floc'h, EL & Pérez-González, PG 2005, 'Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218', Astrophysical Journal, vol. 618, no. 1 II. https://doi.org/10.1086/427550
Egami, E. ; Kneib, J. P. ; Rleke, G. H. ; Ellis, R. S. ; Richard, J. ; Rigby, J. ; Papovich, C. ; Stark, Daniel P ; Santos, M. R. ; Huang, J. S. ; Dole, H. ; Floc'h, E. Le ; Pérez-González, P. G. / Spitzer and hubble space telescope constraints on the physical properties of the z ∼ 7 galaxy strongly lensed by A2218. In: Astrophysical Journal. 2005 ; Vol. 618, No. 1 II.
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