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Spitzer and Hubble Constraints on the Physical Properties of the z~7 Galaxy Strongly Lensed by Abell 2218 | | E. Egami
; J.-P. Kneib
; G. H. Rieke
; 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. Perez-Gonzalez
; | | Date: |
4 Nov 2004 | | Journal: | Astrophys.J. 618 (2004) L5-L8 | | Subject: | astro-ph | | Affiliation: | 2,3), G. H. Rieke , R. S. Ellis , J. Richard (2,3), J. Rigby , C. Papovich , D. Stark , M. R. Santos , J.-S. Huang , H. Dole , E. Le Floc’h , and P. G. Perez-Gonzalez ( Univ. of Arizona, Observatoire Midi-Pyrenees, Caltech, IoA, CfA | | Abstract: | We report the detection of a z~7 galaxy strongly lensed by the massive galaxy cluster Abell 2218 (z=0.175) at 3.6 and 4.5 um using the Spitzer Observatory and at 1.1 um 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 Ly-alpha 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 Myr. 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 (~10^{9} Msun), but the specific star formation rate (star formation rate/M_{star}) is similarly large (> 10^{-9} yr^{-1}), indicating equally vigorous star-forming activity. | | Source: | arXiv, astro-ph/0411117 | | Services: | Forum | Review | PDF | Favorites | |
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