Detection of an apparent, distant cluster of galaxies associated with the radio-tail QSO 3C 275.1

Astronomy and Astrophysics – Astronomy

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Galactic Clusters, Quasars, Radio Sources (Astronomy), Astronomical Photometry, Elliptical Galaxies, Red Shift

Scientific paper

Observations of the fields surrounding the quasars 3C 275.1 and 3C 270.1, which are characterized by tail-like distortions in their radio structure, are presented which have resulted in the detection of a cluster of galaxies associated with 3C 275.1. Deep direct observations of the fields were obtained with the Kitt Peak 4-m telescope in the R bandpass down to a limiting magnitude of about 23.5. The lower-redshift quasar, 3C 275.1 (z = 0.557), is found to be surrounded by 32 faint objects, compared with eight expected background objects. The quasar itself is observed to be located in a faint, elliptical nebulosity interpreted as a giant elliptical galaxy. No statistical evidence of a cluster associated with the higher-redshift quasar 3C 270.1 (z = 1.519) is obtained, consistent with the cosmological interpretation of quasar redshifts.

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