We report the discovery of eight \gamma -ray pulsars in blind frequency searches using the Large Area Telescope ( LAT ) , onboard the Fermi Gamma-ray Space Telescope .
Five of the eight pulsars are young ( \tau _ { c } < 100 kyr ) , energetic ( \dot { E } \geq 10 ^ { 36 } erg s ^ { -1 } ) , and located within the Galactic plane ( |b| < 3 ^ { \circ } ) .
The remaining three are older , less energetic , and located off the plane .
Five pulsars are associated with sources included in the Fermi -LAT bright \gamma -ray source list , but only one , PSR J1413 - 6205 , is clearly associated with an EGRET source .
PSR J1023 - 5746 has the smallest characteristic age ( \tau _ { c } = 4.6 kyr ) and is the most energetic ( \dot { E } = 1.1 \times 10 ^ { 37 } erg s ^ { -1 } ) of all \gamma -ray pulsars discovered so far in blind searches .
PSRs J1957+5033 and J2055+25 have the largest characteristic ages ( \tau _ { c } \sim 1 Myr ) and are the least energetic ( \dot { E } \sim 5 \times 10 ^ { 33 } erg s ^ { -1 } ) of the newly-discovered pulsars .
We present the timing models , light curves , and detailed spectral parameters of the new pulsars .
We used recent XMM observations to identify the counterpart of PSR J2055+25 as XMMU J205549.4+253959 .
In addition , publicly available archival Chandra X-ray data allowed us to identify the likely counterpart of PSR J1023 - 5746 as a faint , highly absorbed source , CXOU J102302.8–574606 .
The large X-ray absorption indicates that this could be among the most distant \gamma -ray pulsars detected so far .
PSR J1023 - 5746 is positionally coincident with the TeV source HESS J1023 - 575 , located near the young stellar cluster Westerlund 2 , while PSR J1954+2836 is coincident with a 4.3 \sigma excess reported by Milagro at a median energy of 35 TeV .
Deep radio follow-up observations of the eight pulsars resulted in no detections of pulsations and upper limits comparable to the faintest known radio pulsars , indicating that these pulsars can be included among the growing population of radio-quiet pulsars in our Galaxy being uncovered by the LAT , and currently numbering more than 20 .