Low deuterium abundance in the zabs=3.514 absorber towards APM 08279+5255

Paolo Molaro, Piercarlo Bonifacio, Miriam Centurion +1

A high-resolution, high signal-to-noise HIRES-Keck spectrum of APM 08279+5255 reveals a feature in the HI Ly alpha profile of the zabs=3.514 absorber at the expected position of th…