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Star-formation at z=4.7 in the environment of the QSO BR1202-07 | | A. Fontana
; S. D’Odorico
; E. Giallongo
; S. Cristiani
; G. Monnet
; P. Petitjean
; | | Date: |
2 Feb 1998 | | Subject: | astro-ph | | Affiliation: | Rome Obs.), S. D’Odorico(ESO), E. Giallongo(Rome Obs.), S. Cristiani(Padova), G. Monnet(ESO), P. Petitjean(IAP | | Abstract: | We present here the spectrum of the galaxy companion to the z=4.7 quasar BR1202-0725, in the optical range 6000-9000 A, corresponding to 1050-1580 A rest-frame. We detect a strong Lya emission line at z=4.702, with an integrated flux of 2x10^{-16} ergs/cm^2/s, and a UV continuum longward of the Lya emission at a flux level of 3x10^{-19}ergs/cm^2/s/A. We fail to detect any CIV[1550] emission with a 3 sigma upper limit of 3x10^{-17} ergs/cm^2/s $. We show that the ratio between Lya and continuum intensity and the absence of a strong CIV emission imply that the UV continuum radiation is the result of an intense star-formation activity rather than of a reprocessing of the QSO flux. The total estimated SFR of this z=4.7 star-forming region is about 15-54 Msun/yr, depending on the IMF and the metallicity. The present data suggest that the Lya emission has a velocity and spatial structure, with possible velocity differences of about 500 km/s on scales of few kpc. These velocity patterns may be a signature of collapsing or merging phenomena in the QSO and its environment, as expected from current models of galaxy formation at high z. | | Source: | arXiv, astro-ph/9802013 | | Services: | Forum | Review | PDF | Favorites | |
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