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On the redshift-volume measurement of the cosmological density parameter
Yoshii, Yuzuru; Takahara, Fumio
AA(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia; National Astronomical Observatory, Mitaka, Japan), AB(Tokyo Metropolitan University, Japan)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 28-33. Research supported by the Australian Academy of Science, Australian National University, and Japan Society for the Promotion of Science. (ApJ Homepage)
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NASA/STI Keywords:
Computational Astrophysics, Cosmology, Galactic Evolution, Red Shift, Astronomical Spectroscopy, Galactic Structure, Luminosity, Spectral Energy Distribution, Star Formation
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The systematic bias due to galaxy evolution in the red-shift volume measurement of the cosmological deceleration parameter q(0) is investigated. Galaxies are classified into five types, E/SO, Sab, Sbc, Scd, and Sdm, which evolve with different star formation histories. The red-shift volume test in the light of galaxy evolution is considered by using the type-dependent evolution models by Arimoto and Yoshii. It is found that for z less than 1, the bias Delta q is mostly equal to -0.2 if the parameters for local luminosity function of galaxies are adopted in the analysis. To determine q(0) within this accuracy it is indispensable to obtain a sample of redshifts for galaxies as deep as m(lim) = about 23 mag at 650 nm or m(lim) = about 24 mag at 800 nm.

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