Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-02
Astronomy and Astrophysics
Astrophysics
14 pages + 2 figures. To appear on AJ, April 1998
Scientific paper
10.1086/300306
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.
Cristiani Stefano
D'Odorico Sandro
Fontana Adriano
Giallongo Emanuele
Monnet Guy
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