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26 April 2024 |
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The Optical Identification of a Primeval Galaxy at z >~ 4.4 | | Adriano Fontana
; Stefano Cristiani
; Sandro D’Odorico
; Emanuele Giallongo
; Sandra Savaglio
; | | Date: |
16 Dec 1995 | | Subject: | astro-ph | | Abstract: | We have obtained with the SUSI CCD camera on the ESO 3.5m NTT deep images in the BVRI bands of the field centered on the QSO BRI 1202-0725 ($z_{it em}=4.694$). In the final combined frames the stellar images have FWHM of 1,1,0.6 and 0.65 arcsec respectively. The R and I images show clearly a galaxy $2.2’’$ from the QSO, corresponding to $13h^{-1}_{50}$ kpc at $zsim 4.5$. Possible identification with the metal absorption systems seen in the line of sight to the QSO, including the highest redshift damped system known to date at $z=4.383$, are discussed. We conclude that its colours can be reconciled only with the spectrum of a primeval galaxy at z >~ 4.4, making it the most distant galaxy detected so far. From its magnitudes and models of young galaxy evolution we deduce that it is forming stars at a rate $sim 30 M_{odot}$ yr$^{-1}$ and has an estimated age of the order of $10^8$ yr or less, implying that the bulk of the stellar population formed at $z < 6$. | | Source: | arXiv, astro-ph/9601086 | | Services: | Forum | Review | PDF | Favorites | |
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