2.2 micron image of 3C 368 at Z = 1.13, a galaxy with aligned radio and stellar axes

Details 2.2 micron image of 3C 368 at Z = 1.13, a galaxy with aligned radio and stellar axes 2.2 micron image of 3C 368 at Z = 1.13, a galaxy with aligned radio and stellar axes

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329l..75c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 329, June 15, 1988, p. L75-L79. Research supported by the Johns H

Astronomy and Astrophysics

Astronomy

90

Cosmology, Galactic Evolution, Infrared Imagery, Interstellar Matter, Radio Galaxies, Red Shift, Morphology, Radio Emission, Radio Sources (Astronomy), Star Formation

Scientific paper

A K-band IR image of the z = 1.13 radio galaxy 3C 368, one of the brightest examples of the recently discovered phenomenon of alignment between the optical and radio axes of powerful distant radio galaxies, is presented. The observations show that the IR morphology is also elongated and aligned along the optical and radio axes, but is not coincident with the radio emission. Various mechanisms for producing the IR and optical flux and the resultant constraints on the origin of the alignment effect in high-redshift radio galaxies are discussed. The most likely explanation is that the emission is produced mainly by young stars formed by interaction of the radio source with the ISM. The IR flux is then interpreted as dominated by a population of red supergiants. Independent of the origin of the emission, the observed alignment implies that powerful radio galaxies at high redshifts are distant from giant ellipticals, even in the IR. Hence, attempts to derive a cosmological 'standard candle' using studies which combine these two types of galaxies are likely to be invalid.

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