Left: Half light radius at 70 μm as a function of redshift for PG QSOs and their hosts. Pink symbols mark systems with literature evidence for being double/interacting, which may inflate the measured size. Right: Half light radius at 70 μm vs. FIR luminosity for the z< 0.1 subsample of QSOs with favourable ratio of size measurments to limits. The relation derived above for galaxies is overplotted.
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