no code implementations • 28 Jan 2021 • S. Perruchot, P. -E. Blanc, J. Guy, L. Le Guillou, S. Ronayette, X. Régal, G. Castagnoli, A. Le Van Suu, E. Sepulveda, E. Jullo, J. -G. Cuby, S. Karkar, P. Ghislain, P. Repain, P. -H. Carton, C. Magneville, A. Ealet, S. Escoffier, A. Secroun, K. Honscheid, A. Elliot, P. Jelinsky, D. Brooks, P. Doel, Y. Duan, J. Edelstein, J. C. Estrada, E. Gastañaga, A. Karcher, M. Landriau, M. Levi, P. Martini, P., N. Palanque-Delabrouille, F. Prada, G. Tarle, K. Zhang
The recently commissioned Dark Energy Spectroscopic Instrument (DESI) will measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique.
Instrumentation and Methods for Astrophysics
no code implementations • 3 Apr 2020 • C. Ravoux, E. Armengaud, M. Walther, T. Etourneau, D. Pomarède, N. Palanque-Delabrouille, C. Yèche, J. Bautista, H. du Mas des Bourboux, S. Chabanier, K. Dawson, J. -M. Le Goff, B. Lyke, A. D. Myers, P. Petitjean, M. M. Pieri, J. Rich, G. Rossi, D. P. Schneider
We derive a 3D map of large-scale matter fluctuations from these data, using a Wiener filter technique.
Cosmology and Nongalactic Astrophysics
6 code implementations • 16 Jan 2014 • M. Betoule, R. Kessler, J. Guy, J. Mosher, D. Hardin, R. Biswas, P. Astier, P. El-Hage, M. Konig, S. Kuhlmann, J. Marriner, R. Pain, N. Regnault, C. Balland, B. A. Bassett, P. J. Brown, H. Campbell, R. G. Carlberg, F. Cellier-Holzem, D. Cinabro, A. Conley, C. B. D'Andrea, D. L. Depoy, M. Doi, R. S. Ellis, S. Fabbro, A. V. Filippenko, R. J. Foley, J. A. Frieman, D. Fouchez, L. Galbany, A. Goobar, R. R. Gupta, G. J. Hill, R. Hlozek, C. J. Hogan, I. M. Hook, D. A. Howell, S. W. Jha, L. Le Guillou, G. Leloudas, C. Lidman, J. L. Marshall, A. Möller, A. M. Mourão, J. Neveu, R. Nichol, M. D. Olmstead, N. Palanque-Delabrouille, S. Perlmutter, J. L. Prieto, C. J. Pritchet, M. Richmond, A. G. Riess, V. Ruhlmann-Kleider, M. Sako, K. Schahmaneche, D. P. Schneider, M. Smith, J. Sollerman, M. Sullivan, N. A. Walton, C. J. Wheeler
We have followed the methods and assumptions of the SNLS 3-year data analysis except for the following important improvements: 1) the addition of the full SDSS-II spectroscopically-confirmed SN Ia sample in both the training of the SALT2 light curve model and in the Hubble diagram analysis (\nsdssc SNe), 2) inter-calibration of the SNLS and SDSS surveys and reduced systematic uncertainties in the photometric calibration, performed blindly with respect to the cosmology analysis, and 3) a thorough investigation of systematic errors associated with the SALT2 modeling of SN Ia light-curves.
Cosmology and Nongalactic Astrophysics
2 code implementations • 7 Apr 2009 • G. Bazin, N. Palanque-Delabrouille, J. Rich, V. Ruhlmann-Kleider, E. Aubourg, L. Le Guillou, P. Astier, C. Balland, S. Basa, R. G. Carlberg, A. Conley, D. Fouchez, J. Guy, D. Hardin, I. M. Hook, D. A. Howell, R. Pain, K. Perrett, C. J. Pritchet, N. Regnault, M. Sullivan, P. Antilogus, V. Arsenijevic, S. Baumont, S. Fabbro, J. Le Du, C. Lidman, M. Mouchet, A. Mourão, E. S. Walker
Using spectroscopy and light-curve fitting to discriminate against SNIa, we find a sample of 117 core-collapse supernova candidates with redshifts $z<0. 4$ (median redshift of 0. 29) and measure their rate to be larger than the type Ia supernova rate by a factor $4. 5\pm0. 8(stat.)
Cosmology and Nongalactic Astrophysics