Spectroscopy and photometry of 3C 427.1 and 3C 13 - Distant radio galaxies with Z greater than 1.0

Details Spectroscopy and photometry of 3C 427.1 and 3C 13 - Distant radio galaxies with Z greater than 1.0 Spectroscopy and photometry of 3C 427.1 and 3C 13 - Distant radio galaxies with Z greater than 1.0

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..382s&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Mar. 1, 1981, p. 382-387, 389-391. NSF-supported research.

Astronomy and Astrophysics

Astronomy

26

Astronomical Photometry, Astronomical Spectroscopy, Radio Galaxies, Radio Sources (Astronomy), Red Shift, Cosmology, Elliptical Galaxies, Flame Spectroscopy, Globular Clusters, Iue, Ultraviolet Astronomy

Scientific paper

Quantitative spectroscopy of the two very faint galaxies associated with 3C 13 and 3C 427.1 yields absorption break redshifts of 1.050 and 1.175 respectively. The spectroscopic criteria are the UV discontinuities at 2640 and 2900 A and the steep continuum slope increase longward of 3100 A. These signatures are evident on IUE spectra of nearby E galaxies and in the redshifted spectra of cluster ellipticals in the z range of 0.2-0.54. Despite the fact that the two very distant galaxies are seen as they radiated some 10-billion years ago, their rest frame UV colors are intrinsically only 0.7 mag bluer than local giant elliptical galaxies in the range 3000-3800 A. This implies that the last epoch of star formation for these galaxies was at a considerably earlier time, about 6-billion years further in the past, if q(0) = 0.05 and H(0) = 50.

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