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

被引：18

作者：

Crawford, F. ^{[1
]}

Stovall, K. ^{[2
,3
]}

Lyne, A. G. ^{[4
]}

Stappers, B. W. ^{[4
]}

Nice, D. J. ^{[5
]}

Stairs, I. H. ^{[6
]}

Lazarus, P. ^{[7
,8
]}

Hessels, J. W. T. ^{[9
,10
]}

Freire, P. C. C. ^{[8
]}

Allen, B. ^{[11
,12
,13
]}

Bhat, N. D. R. ^{[14
]}

Bogdanov, S. ^{[15
]}

Brazier, A. ^{[16
]}

Camilo, F. ^{[14
,17
]}

Champion, D. J. ^{[8
]}

Chatterjee, S. ^{[16
]}

Cognard, I. ^{[18
,19
,20
]}

Cordes, J. M. ^{[16
]}

Deneva, J. S. ^{[17
]}

Desvignes, G. ^{[8
,18
,19
,20
]}

Jenet, F. A. ^{[2
]}

Kaspi, V. M. ^{[7
]}

Knispel, B. ^{[11
,12
]}

Kramer, M. ^{[8
]}

van Leeuwen, J. ^{[9
,10
]}

Lorimer, D. R. ^{[21
]}

Lynch, R. ^{[7
]}

McLaughlin, M. A. ^{[21
]}

Ransom, S. M. ^{[22
]}

Scholz, P. ^{[7
]}

Siemens, X. ^{[13
]}

Venkataraman, A. ^{[17
]}

机构：

[1] Franklin & Marshall Coll, Dept Phys & Astron, Lancaster, PA 17604 USA

[2] Univ Texas Brownsville, Ctr Gravitat Wave Astron, Brownsville, TX 78520 USA

[3] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA

[4] Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England

[5] Lafayette Coll, Dept Phys, Easton, PA 18042 USA

[6] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[7] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[8] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[9] Netherlands Inst Radio Astron, ASTRON, NL-7990 AA Dwingeloo, Netherlands

[10] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 XH Amsterdam, Netherlands

[11] Max Planck Inst Gravitat Phys, Albert Einstein Inst, D-30167 Hannover, Germany

[12] Leibniz Univ Hannover, Inst Gravitat Phys, D-30167 Hannover, Germany

[13] Univ Wisconsin, Dept Phys, Milwaukee, WI 53211 USA

[14] Swinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[15] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[16] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[17] Arecibo Observ, Arecibo, PR 00612 USA

[18] CNRS, LPC2E, F-18330 Nancay, France

[19] Univ Orleans, F-18330 Nancay, France

[20] Observ Paris, Stn Radioastron Nancay, F-18330 Nancay, France

[21] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA

[22] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 757卷 / 01期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 加拿大创新基金会; 欧洲研究理事会;

关键词：

pulsars: general; pulsars: individual (PSR J1844+0115; PSR J1850+0124; PSR J1900+0308; PSR J1944+2236); surveys; LOCAL LORENTZ INVARIANCE; BINARY RADIO PULSARS; RELATIVISTIC GRAVITY; EQUIVALENCE PRINCIPLES; CONSERVATION-LAWS; EVOLUTION; SYSTEMS; MASS; CONSTRAINTS;

D O I：

10.1088/0004-637X/757/1/90

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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(-3)), are distant (greater than or similar to 3.4 kpc), faint at 1.4 GHz (less than or similar to 0.2 mJy), and are fully recycled (with spin periods P between 3.5 and 4.9ms). 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.

引用

页数：10

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