Phenomenological analysis of observed relations for low-redshift galaxies

Journal Article · Mon Dec 01 04:00:00 EST 1975 · Proc. Natl. Acad. Sci. U.S.A., v. 72, no. 12, pp. 4691-4695

DOI:https://doi.org/10.1073/pnas.72.12.4691· OSTI ID:4028907

Nicoll, J F; Segal, I E

Maximum-likelihood estimates are made for the exponent p in the phenomenological redshift-distance relation z varies as r/sup p/ for galaxies at redshifts less than or equal to 0.03, on the basis of redshift (z)-magnitude (m)- apparent diameter (theta) observations given in the Reference Catalogue of Bright Galaxies [de Vaucouleurs, G. and de Vaucouleurs, A. (1964)]. The estimates are in the range 1.96 less than or equal to p less than or equal to 2.04 for the full sample of 742 galaxies having m - z - theta data, with dispersions less than or equal to 0.08, and in a similar but broader range for various subsamples. Explicit allowance for an observational cutoff in apparent magnitude in the m - z relation reinforces the result that p is approximately equal 2. Independent estimation based on a cut-off independent generalized Kafka--Schmidt V/V/sub m/ test for a subsample in conservatively limited redshift and magnitude ranges yields p = 2.05. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-030793
• OSTI ID: 4028907
• Journal Information: Proc. Natl. Acad. Sci. U.S.A., v. 72, no. 12, pp. 4691-4695, Journal Name: Proc. Natl. Acad. Sci. U.S.A., v. 72, no. 12, pp. 4691-4695; ISSN PNASA
• Country of Publication: United States
• Language: English

Related Subjects

*GALAXIES-- RED SHIFT
640105* --Physics Research--Astrophysics & Cosmology-- Galaxies
BRIGHTNESS
DISTANCE
HUBBLE EFFECT
N56500* --Physics (Astrophysics & Cosmology)--Galaxies