Accès ouvert
2016
preprint
OpenAlex
Amir Aghamousa, Steve Ahlen, Shadab Alam, Carlos Prieto et autres
DESI (Dark Energy Spectroscopic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through redshift-space distortions with a wide-area galaxy and quasar redshift survey. To trace the underlying dark matter …
kr, us, es, fr, gb, ca, ch, cl, mx, cn, it
(code pays fourni par la source)
Accès ouvert
1987
article
OpenAlex
A. R. Walker
B and V CCD photometry of Sextans A to limits V = 22, B = 23.5, demonstrate that two recent studies of the galaxy contain considerable systematic errors in their B and V photometry. These errors are determined here so that corrections …
Afrique du Sud
(code pays fourni par la source)
Accès ouvert
1981
article
OpenAlex
A. R. Walker
Proxima Centauri is found to have a rate of flare production rather less than stars of similar luminosity, but very much greater than stars of similar age and higher luminosity, supporting the supposition that very low luminosity red dwarfs flare irrespective of …
Afrique du Sud
(code pays fourni par la source)
Accès ouvert
1980
article
OpenAlex
A. R. Walker
An occultation of a 13th magnitude star by Charon (1978 P1) gives a minimum diameter of 1200 km for the satellite. The occultation light curve indicates that Charon is a solid body.
Afrique du Sud
(code pays fourni par la source)