We present the discovery of five millisecond pulsars (MSPs) from the PALFA Galactic plane survey using Arecibo. Four of these (PSRs J0557+1551, J1850+0244, J1902+0300, and J1943+2210) are binary pulsars whose companions are likely white dwarfs, and one (PSR J1905+0453) is isolated. Phase-coherent timing solutions, ranging from similar to 1 to similar to 3 yr in length, and based on observations from the Jodrell Bank and Arecibo telescopes, provide precise determinations of spin, orbital, and astrometric parameters. All five pulsars have large dispersion measures (>100 pc cm(-3), within the top 20% of all known Galactic field MSPs) and are faint (1.4 GHz flux density less than or similar to 0.1 mJy,within the faintest 5% of all known Galactic field MSPs), illustrating PALFA's ability to find increasingly faint, distant MSPs in the Galactic plane. In particular, PSR J1850+0244 has a dispersion measure of 540 pc cm(-3), the highest of all known MSPs. Such distant, faint MSPs are important input for accurately modeling the total Galactic MSP population.
- general pulsars
- individual pulsars (PSR J0557+1551, PSR J1850+0244, PSR J1902+0300, PSR J1905+0453, PSR J1943+221)