Radio Observations of the Quadruple Lens 1608+656

Details Radio Observations of the Quadruple Lens 1608+656 Radio Observations of the Quadruple Lens 1608+656

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447l...9s&link_type=abstract

Astrophysical Journal Letters v.447, p.L9

Astronomy and Astrophysics

Astronomy

14

Cosmology: Gravitational Lensing

Scientific paper

VLA observations at 8.4 and 15 GHz of a sample of 119 inverted-spectrum radio sources revealed that one object, 1608+656, consists of four components in a configuration suggestive of gravitational lensing. The maximum separation between individual components is 2."1. An independent discovery of this object was made through the Cosmic Lens All-Sky Survey, as reported in the companion paper (Myers et al. 1995). All four components have similar flat spectral indices, consistent with lensing. The lensed source is found to be the nucleus of a radio galaxy with double-lobed structure of unusually large physical dimensions and a luminosity at the Fanaroff-Riley class I--II transition. The core of 1608+656 has a flat spectrum from 1.4 to 18.5 GHz, but the flux density falls significantly below 1 GHz. The observed core-lobe ratio is about 1:4 at 1.4 GHz. The southwestern lobe is highly polarized, while the northeastern lobe is unpolarized, properties reminiscent of the Laing-Garrington depolarization asymmetry in low-redshift radio galaxies.

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