Detection of a Lyman α Emission-Line Companion to the z = 4.69 QSO BR1202–0725 1
نویسندگان
چکیده
We report the detection of a nearby emission line companion to the z = 4.695 quasar BR1202–0725. Deep narrow-band exposures on this field from the UH 2.2 m show a Lyα flux of 1.5×10 ergs cm s. High-resolution HST WFC2 imaging in the F814W filter band shows continuum structure near the emission position, at 2 .6 NW of the quasar, corresponding to a projected separation of ∼ 7.5 h kpc for q0=0.5, where h ≡ H0/100 km s −1 Mpc. We discuss possible explanations for the combined line and color properties. The ionization is most likely produced by the quasar, but if due to underlying star formation would require a star formation rate of ∼ 7 h M⊙ yr . Subject headings: cosmology: early universe — cosmology: observations — galaxies: intergalactic medium — galaxies: quasars: emission lines — galaxies: quasars: individual (BR1202–0725)
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