Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (4) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
· HEP/Spires Information
·
· Translate This Page
Title:
Galaxy formation in Lambda greater than 0 Friedmann models: Consequences for the number counts versus redshift test
Authors:
Martel, Hugo
Affiliation:
AA(University of Texas, Austin, TX, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 421, no. 2, p. L67-L70 (ApJ Homepage)
Publication Date:
02/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
APPLICATIONS OF MATHEMATICS, BIG BANG COSMOLOGY, LARGE SPACE STRUCTURES, PERTURBATION, STAR FORMATION, COSMIC BACKGROUND EXPLORER SATELLITE, HUBBLE CONSTANT, LUMINOSITY, RED SHIFT, SPACE DENSITY
DOI:
10.1086/187189
Bibliographic Code:
1994ApJ...421L..67M

Abstract

We study the effect of the cosmological constant Lambda on galaxy formation using a simple spherical top-hat overdensity model. We consider models with Omega0 = 0.2, lambda0 = 0, and Omega0 = 0.2, lambda0 = 0.8 (where Omega0 is the density parameter, and lambda0 identically equal Lambda/3 H0 exp 2 where H0 is the Hubble constant). We adjust the initial power spectrum amplitude so that both models reproduce the same large-scale structures. The galaxy formation era in the lambda0 = 0 model occurs early (z approximately 6) and is very short, whereas in the lambda0 = 0.8 model the galaxy formation era starts later (z approximately 4), and last much longer, possibly all the way to the present. Consequently, galaxies at low redshift (z less than 1) are significantly more evolved in the lambda0 = 0 model than in the lambda0 = 0.8 model. This result implies that previous attempts to determine Lambda using the number counts versus redshift test are probably unreliable.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints