Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743037f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #430.37; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present a high signal-to-noise spectrum of a bright galaxy at z = 4.9 in 14 h of integration on VLT FORS2. This galaxy is extremely bright, i_850 = 23.10 +/- 0.01, and is strongly-lensed by the foreground massive galaxy cluster Abell 1689 (z=0.18). Stellar continuum is seen longward of the Ly-alpha emission line at 7100 A, while intergalactic H I produces strong absorption shortward of Ly-alpha. Two transmission spikes at 6800 A and 7040 A are also visible, along with other structures at shorter wavelengths. Although fainter than a QSO, the absence of a strong central ultraviolet flux source in this star forming galaxy enables a measurement of the H I flux transmission in the intergalactic medium (IGM) in the vicinity of a high redshift object. We find that the effective H I optical depth of the IGM is remarkably high within a large 14 Mpc (physical) region surrounding the galaxy compared to that seen towards QSOs at similar redshifts. Evidently, this high-redshift galaxy is located in a region of space where the amount of H I is much larger than that seen at similar epochs in the diffuse IGM. We argue that observations of high-redshift galaxies like this one provide unique insights on the nascent stages of baryonic large-scale structures that evolve into the filamentary cosmic web of galaxies and clusters of galaxies observed in the present universe. Follow-up narrow-band imaging at Subaru Observatory has revealed an a coincident overdensity of Ly-alpha Emitters.
Bowen David
Coe Dan
Egami Eiichi E.
Fan Xiaohui
Frye Brenda L.
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