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We revise the assumptions of the parameters involved in predicting the numberof supernova remnants detectable in the nuclear lines of the decay chain of44Ti. Specifically, we consider the distribution of the supernova progenitors,the supernova rate in the Galaxy, the ratios of supernova types, the Galacticproduction of 44Ti, and the 44Ti yield from supernovae of different types, toderive credible bounds on the expected number of detectable remnants. We findthat, within 1 sigma uncertainty, the Galaxy should contain an average of5.1+2.4-2.0 remnants detectable to a survey with a 44Ti decay line flux limitof 10E-5 photons/cm2/s, with a probability of detecting a single remnant of(2.7+10.0-2.4)%, and an expected number of detections between 2 and 9 remnants,making the single detection of Cas A unlikely but consistent with our models.Our results show that the probability of detecting the brightest 44Ti fluxsource at the high absolute Galactic longitude of Cas A or above is ~10%. Usingthe detected flux of Cas A, we attempt to constrain the Galactic supernova rateand Galactic production of 44Ti, but find the detection to be only weaklyinformative. We conclude that even future surveys having 200 times moresensitivity than state-of-the art surveys can be guaranteed to detect only afew new remnants, with an expected number of detections between 8 and 21 at alimiting 44Ti decay flux of 10E-7 photons/cm2/s.

Limits on the Number of Galactic Young Supernova Remnants Emitting in the Decay Lines of 44Ti