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Fig. 2


Equivalent isotropic luminosities and 3σ upper limits (arrows) for all 61 sources detected in one or both of the 1.6 GHz OH and 22 GHz H2O maser species, with 35 detected in H2O only (x) and 18 in OH only (+). The circle diameters are proportional to the source redshift. The OH MM sources tend to have a higher redshift. Masers of both species may be found in up to 8 sources (solid squares; source names given), with the caveat that the OH KM in UGC 5101 and IRAS 17526+3253 reported by Martin et al. (1989) were not detected in later (or earlier) observations. The inset shows OH and H2O luminosities or 3σ upper limits against redshift for the 61 detected sources and for 34 sources undetected in either species. The H2O and OH detection thresholds (solid and dashed lines) assume 1.0 mJy rms and a 2.0 km s-1 FWHM.

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