Infrared surface photometry of 3C 65: Stellar evolution and the Tolman signal

Details Infrared surface photometry of 3C 65: Stellar evolution and the Tolman signal Infrared surface photometry of 3C 65: Stellar evolution and the Tolman signal

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l..79r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 427, no. 2, p. L79-L82

Astronomy and Astrophysics

Astronomy

13

Brightness Distribution, Cosmology, Galactic Evolution, Infrared Astronomy, Luminosity, Stellar Evolution, Astronomical Models, Astronomical Photometry, Computer Programs, Goodness Of Fit, Infrared Imagery, Morphology, Radio Galaxies, Red Shift, Spectral Energy Distribution

Scientific paper

We present an analysis of the infrared surface brightness profile of the high-redshift radio galaxy 3C 65 (z = 1.176), which is well fitted by a de Vaucouleurs r1/4 law. A model surface fitting routine yields characteristic photometric parameters comparable to those of low-redshift radio galaxies and brightest cluster members (BCMs) in standard cosmologies. The small displacement of this galaxy from the locus of low-redshift systems on the mur - log(re) plane suggests that little or no luminosity evolution is required in a cosmological model with (Omega0, lambda0 = (1,0), while a modest degree of luminosity evolution, accountable by passive evolution of the stellar population, is implied in models with (0, 0) or (0.1, 0.9). A nonexpanding cosmology is unlikely because it would require 3C 65 to lie at the extreme end of the distribution of properties of local gE galaxies, and the effects of plausible stellar and/or dynamic evolution would make 3C 65 even more extreme by the present epoch.

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