We report the discovery of nine previously unknown gamma-ray pulsars in a blind search of data from the Fermi Large Area Telescope ( LAT ) .
The pulsars were found with a novel hierarchical search method originally developed for detecting continuous gravitational waves from rapidly rotating neutron stars .
Designed to find isolated pulsars spinning at up to kHz frequencies , the new method is computationally efficient , and incorporates several advances , including a metric-based gridding of the search parameter space ( frequency , frequency derivative and sky location ) and the use of photon probability weights .
The nine pulsars have spin frequencies between 3 and 12 Hz , and characteristic ages ranging from 17 kyr to 3 Myr .
Two of them , PSRs J1803–2149 and J2111+4606 , are young and energetic Galactic-plane pulsars ( spin-down power above 6 \times 10 ^ { 35 } erg s ^ { -1 } and ages below 100 kyr ) .
The seven remaining pulsars , PSRs J0106+4855 , J0622+3749 , J1620–4927 , J1746–3239 , J2028+3332 , J2030+4415 , J2139+4716 , are older and less energetic ; two of them are located at higher Galactic latitudes ( |b| > 10 \arcdeg ) .
PSR J0106+4855 has the largest characteristic age ( 3 Myr ) and the smallest surface magnetic field ( 2 \times 10 ^ { 11 } G ) of all LAT blind-search pulsars .
PSR J2139+4716 has the lowest spin-down power ( 3 \times 10 ^ { 33 } erg s ^ { -1 } ) among all non-recycled gamma-ray pulsars ever found .
Despite extensive multi-frequency observations , only PSR J0106+4855 has detectable pulsations in the radio band .
The other eight pulsars belong to the increasing population of radio-quiet gamma-ray pulsars .