Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..371h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 15, 1985, p. 371-389.
Astronomy and Astrophysics
Astrophysics
127
Astronomical Spectroscopy, Elliptical Galaxies, Galactic Evolution, Spectral Emission, Charge Coupled Devices, Cosmology, Hubble Diagram, Red Shift, Star Formation Rate
Scientific paper
The author has conducted a major new spectrophotometric survey of giant elliptical galaxies in order to measure changes due to spectral evolution. The data set consists of good spectrophotometry on 33 galaxies to a redshift of z = 0.8. The look-back time for this redshift, H0 ≈ 50 km s-1Mpc-1, q0 ≈ 0, is 7 - 8 Gyr. The objects were chosen from a new multicolor, multifield survey using the prime focus cameras of the KPNO and CTIO 4 m telescopes. The amplitude of the 4000 Å break was used as the indicator of spectral evolution. The data of the evolution diagram (redshift vs. break amplitude) indicate that a change of less than 7% in the break amplitude is evident at the high-redshift end, z ≈ 0.8. These data also indicate that giant elliptical galaxies are much older than 8 Gyr. The observed width of the break amplitude distribution for all program galaxies indicates the validity of the assumption of coevality to within ±2 Gyr to a redshift of z ≈ 0.8.
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