We present Clusterrank , a new algorithm for identifying dispersed astrophysical pulses .
Such pulses are commonly detected from Galactic pulsars and rotating radio transients ( RRATs ) , which are neutron stars with sporadic radio emission .
More recently , isolated , highly dispersed pulses dubbed fast radio bursts ( FRBs ) have been identified as the potential signature of an extragalactic cataclysmic radio source distinct from pulsars and RRATs .
Clusterrank helped us discover 14 pulsars and 8 RRATs in data from the Arecibo 327 MHz Drift Pulsar Survey ( AO327 ) .
The new RRATs have DMs in the range 23.5 - 86.6 pc cm ^ { -3 } and periods in the range 0.172 - 3.901 s. The new pulsars have DMs in the range 23.6 - 133.3 pc cm ^ { -3 } and periods in the range 1.249 - 5.012 s , and include two nullers and a mode-switching object .
We estimate an upper limit on the all-sky FRB rate of 10 ^ { 5 } day ^ { -1 } for bursts with a width of 10 ms and flux density \gtrsim 83 mJy .
The DMs of all new discoveries are consistent with a Galactic origin .
In comparing statistics of the new RRATs with sources from the RRATalog , we find that both sets are drawn from the same period distribution .
In contrast , we find that the period distribution of the new pulsars is different from the period distributions of canonical pulsars in the ATNF catalog or pulsars found in AO327 data by a periodicity search .
This indicates that Clusterrank is a powerful complement to periodicity searches and uncovers a subset of the pulsar population that has so far been underrepresented in survey results and therefore in Galactic pulsar population models .