High-z objects and cold-dark-matter cosmogonies: the case of 53W091
| dc.creator | Kashlinsky, A. | |
| dc.creator | Jimenez, R. | |
| dc.date | 1996-10-31 | |
| dc.date.accessioned | 2026-07-07T02:22:13Z | |
| dc.date.available | 2026-07-07T02:22:13Z | |
| dc.description | The recently discovered high redshift galaxy, 53W091, with accurate age measurements (Dunlop et al 1996) provides a measure of the small-scale power of the primordial density field and, as we show, a crucial test of the inflation-inspired models. It allows $Ω$=1 cosmologies only for low values of $H_0$, but then pushes formation of that galaxy to redshift much greater than allowed for by the cold-dark-matter density field. Cold-dark-matter (CDM) models with cosmological constant ($Λ$) and low $Ω$ would decrease the redshift at which this galaxy has collapsed. However, in CDM models decreasing $Ω$ suppresses the small scale power in the density field and this effect turns out to be dominant. We estimate the mass of the galaxy and show that it represents a very rare and unlikely event in the density field of such models. Similar problems would occur in other modifications of the CDM cosmogonies. | |
| dc.description | Talk given at "The nature of elliptical galaxies", Canberra 1996, eds. M. Arnaboldi, G.S. Da Costa & P. Saha | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9610269 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9610269 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/10796 | |
| dc.subject | Astrophysics | |
| dc.title | High-z objects and cold-dark-matter cosmogonies: the case of 53W091 | |
| dc.type | text |