A new measurement of the expansion history of the Universe at z=1.26 with cosmic chronometers in VANDELS

We derive a new constraint on the expansion history of the Universe by applying the cosmic chronometers method, studying the age evolution of high-redshift galaxies with a full-spectral-fitting approach. We select a sample of 39 massive (log(M/M_\odot)>10.8) and passive (log(sSFR/yr^{-1})<-11) galaxies from the data release 4 of the VANDELS survey... Show more