Recycled Pulsars (Google eBook)

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Universal-Publishers, 2008 - Science - 116 pages
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We present the results of a large-area survey for millisecond pulsars (MSPs) at moderately high galactic latitudes with the 64 m Parkes radio telescope, along with follow-up timing and optical studies of the newly-discovered pulsars and several others. Major results include the first precise measurement of the mass of a fully recycled pulsar and measurement of orbital period decay in a double neutron star binary system allowing a test of general relativity along with improved measurements of the neutron star masses. In a survey of approx. 4,150 square degrees, we discovered 26 previously unknown pulsars, including 7 "recycled" millisecond or binary pulsars. Several of these recycled pulsars are particularly interesting: PSR J1528-3146 is in a circular orbit with a companion of at least 0.94 solar masses; it is a member of the recently recognized class of intermediate mass binary pulsar (IMBP) systems with massive white dwarf companions. We have detected optical counterparts for this and one other IMBP system; taken together with optical detections and non-detections of several similar systems, our results indicate that the characteristic age consistently overestimates the time since the end of mass accretion in these recycled systems. This result implies that the pulsar spin period at the end of the accretion phase is not dramatically shorter than the observed period as is generally assumed. PSR J1600-3053 is among the best high-precision timing pulsars known and should be very useful as part of an ensemble of pulsars used to detect very low frequency gravitational waves. PSR J1738+0333 has an optical counterpart which, although not yet well-studied, has already allowed a preliminary measurement of the system's mass ratio. The most significant discovery of this survey is PSR J1909-3744, a 2.95 ms pulsar in an extremely circular 1.5 d orbit with a low-mass white dwarf companion. Though this system is a fairly typical low-mass binary pulsar (LMBP) system, it has several exceptional qualities: an extremely narrow pulse profile and stable rotation have enabled the most precise long-term timing ever reported, and a nearly edge-on orbit gives rise to a strong Shapiro delay signature in the pulse timing data which has allowed the most precise measurement of the mass of a millisecond pulsar: 1.438 0.024 solar masses. Our accurate parallax distance measurement, d = 1.14 +0.08 / -0.07 kpc, combined with the mass of the optically-detected companion, 0.2038 0.022 solar masses, will provide an important calibration for white dwarf models relevant to other LMBP companions. We have measured the decay of the binary period of the double neutron star system B2127+11C in the globular cluster M15. This has allowed an improved measurement of the mass of the pulsar, 1.3584 0.0097 solar masses, and companion, 1.3544 0.0097 solar masses, as well as a test of general relativity at the 3% level. We find that the proper motions of this pulsar as well as B2127+11A and B2127+11B are consistent with each other and with one published measurement of the cluster proper motion. We have discovered three binary millisecond pulsars in the globular cluster M62 using the 100-m Green Bank Telescope (GBT). These pulsars are the first objects discovered with the GBT. We briefly describe a wide-bandwidth coherent dedispersion backend used for some of the high precision pulsar timing observations presented here.
  

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Contents

Introduction
1
A LargeArea Survey for Radio Pulsars at High Galactic Latitudes
5
21 Introduction
6
22 Observations and Analysis
7
23 Detected Pulsars
10
24 Implications for SubMillisecond Pulsars
26
25 Conclusions
29
Discovery of Six Recycled Pulsars in a High Galactic Latitude Survey
31
The Mass of a Millisecond Pulsar
55
51 Introduction
56
52 Observations and Pulse Timing
57
521 Shapiro Delay and Component Masses
58
53 Conclusions
63
Optical Detection of Two Intermediate Mass Binary Pulsar Companions
65
61 Introduction
66
62 Observations
67

31 Introduction
32
33 Discovery and Timing of Six Recycled Pulsars
33
Massive Companion
35
LMBP with Strong Scintillation
39
Isolated MSP
41
PSR J19093744 A Binary Millisecond Pulsar with a Very Small Duty Cycle
43
41 Introduction
44
42 Pulse Timing
45
421 Shapiro Delay
49
422 Distance
50
44 Conclusions
52
63 Discussion and Conclusions
70
Measurement of Orbital Decay in the Double Neutron Star Binary PSR B2127+11C
73
71 Introduction
74
73 Discussion
75
732 Kinematic Effects on Pulse Timing
79
733 Component Masses of M15C and a Test of General Relativity
80
735 Intrinsic Spin Period Derivatives
83
Pulsars in M62
85
A WideBandwidth Coherent Dedispersion Backend for HighPrecision Pulsar Timing
87
Copyright

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Page iii - I would like to thank some of the many people who have influenced and contributed to me and this work.
Page 99 - SPIE 4839, pp. 566-577, 2002. 10. Monet DG, Levine SE, Canzian B., Abies HD, Bird AR, Dahn CC, Guetter HH, Harris HC, Henden AA, Leggett SK, Levinson HF, Luginbuhl CB, Martini J., Monet AKB, Munn JA, Pier JR, Rhodes AR, Riepe B., Sell S., Stone RC, Vrba FJ, Walker RL, Westerhout G., Brucato RJ, Reid IN, Schoening W., Hartley M., Read MA, Tritton SB, "The USNO-B catalog", Astronomical Journal, 125, pp. 984-993, 2003. 11.

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