FOUR HIGHLY DISPERSED MILLISECOND PULSARS DISCOVERED IN THE ARECIBO PALFA GALACTIC PLANE SURVEY

We present the discovery and phase-coherent timing of four highly dispersed millisecond pulsars (MSPs) from the Arecibo PALFA Galactic plane survey: PSRs J1844+0115, J1850+0124, J1900+0308, and J1944+2236. Three of the four pulsars are in binary systems with low-mass companions, which are most likel...

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Published in:The Astrophysical journal 2012-09, Vol.757 (1), p.1-10
Main Authors: CRAWFORD, F, STOVALL, K, BHAT, N. D. R, BOGDANOV, S, BRAZIER, A, CAMILO, F, CHAMPION, D. J, CHATTERJEE, S, COGNARD, I, CORDES, J. M, DENEVA, J. S, DESVIGNES, G, LYNE, A. G, JENET, F. A, KASPI, V. M, KNISPEL, B, KRAMER, M, VAN LEEUWEN, J, LORIMER, D. R, LYNCH, R, MCLAUGHLIN, M. A, RANSOM, S. M, SCHOLZ, P, STAPPERS, B. W, SIEMENS, X, VENKATARAMAN, A, NICE, D. J, STAIRS, I. H, LAZARUS, P, HESSELS, J. W. T, FREIRE, P. C. C, ALLEN, B
Format: Article
Language:English
Subjects:
Aerial surveys
Arrays
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BINARY STARS
Cosmology and Extra-Galactic Astrophysics
Dispersion
Earth, ocean, space
Exact sciences and technology
GHZ RANGE
MASS
MILKY WAY
Millisecond pulsars
Orbitals
Physics
Planes
PULSARS
Recycled
Sciences of the Universe
SPIN
WHITE DWARF STARS
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Summary:We present the discovery and phase-coherent timing of four highly dispersed millisecond pulsars (MSPs) from the Arecibo PALFA Galactic plane survey: PSRs J1844+0115, J1850+0124, J1900+0308, and J1944+2236. Three of the four pulsars are in binary systems with low-mass companions, which are most likely white dwarfs, and which have orbital periods on the order of days. The fourth pulsar is isolated. All four pulsars have large dispersion measures (DM > 100 pc cm super(-3)), are distant ([gap]3.4 kpc), faint at 1.4 GHz ([lap]0.2 mJy), and are fully recycled (with spin periods P between 3.5 and 4.9 ms). The three binaries also have very small orbital eccentricities, as expected for tidally circularized, fully recycled systems with low-mass companions. These four pulsars have DM/P ratios that are among the highest values for field MSPs in the Galaxy. These discoveries bring the total number of confirmed MSPs from the PALFA survey to 15. The discovery of these MSPs illustrates the power of PALFA for finding weak, distant MSPs at low-Galactic latitudes. This is important for accurate estimates of the Galactic MSP population and for the number of MSPs that the Square Kilometer Array can be expected to detect.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/757/1/90