The ultra-compact binary candidate KUV 23182+1007 is a bright quasar

TL;DR

This paper reclassifies KUV 23182+1007 from a potential AM CVn star to a bright quasar at redshift 0.665 based on high-quality spectral analysis.

Contribution

It provides a detailed spectral analysis that corrects the previous classification of KUV 23182+1007, establishing it as a quasar rather than a cataclysmic variable.

Findings

KUV 23182+1007 is a quasar at z=0.665.

Spectral features differ from initial AM CVn classification.

High-S/N spectrum confirms quasar identity.

Abstract

KUV 23182+1007 was identified as a blue object in the Kiso UV Survey in the 1980s. Classification-dispersion spectroscopy showed a featureless continuum except for a strong emission line in the region of He II 4686 A. This is a hallmark of the rare AM CVn class of cataclysmic variable star, so we have obtained a high-S/N blue spectrum of this object to check its classification. Instead, the spectrum shows a strong quasar-like emission line centred on 4662 A. Comparison with the SDSS quasar template spectra confirms that KUV 23182+1007 is a quasar with a redshift of z = 0.665.