Publication

New PAU Paper

“The PAU Survey: Photometric redshifts using transfer learning from simulations” by M. Eriksen et al. has been uploaded to arXiv.

It is the first paper demonstrating we can constrain PAUS redshifts with deep learning techniques. Previously we had (Eriksen 2019) shown it worked with template fitting method. Using a deep neural network we managed to improvethe photo-z scatter with 50% for the faintest galaxies. This was possible througha set of different techniques introduced in the paper. Among the most important was combining simulated and observed data when training the neural network.We also included techniques like auto-encoders to extract information about the galaxy SEDs.

Link to arXiv

Latest Group News

New publication

New DESI paper by the cosmology group

May 18, 2022

The effect of quasar redshift errors on Lyman-α forest correlation functions” by A. Font-Ribera, Ignasi Pérez-Ràfols, César Ramírez-Pérez and collaborators has been uploaded to arXiv.

Conference

IFAE at Moriond Cosmology 2022

January 27, 2022

The Moriond Cosmology took place on January 23-30, La Thuile, Italy. Members of the observational Cosmology group at IFAE contributed to the conference.

New Paper

New Cosmology group paper

January 19, 2022

The PAU Survey: Measurements of the 4000 Å spectral break with narrow-band photometry” by members of the Cosmology Group and PIC has been uploaded to arXiv.