what’s the deal with psr j1022+1001?
TRANSCRIPT
![Page 1: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/1.jpg)
What’s the deal with PSR J1022+1001?
Parkes Pulsar Timing Array Discussion 5 September 2012
Willem van Straten
1
![Page 2: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/2.jpg)
PSR J1022+1001 profile
![Page 3: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/3.jpg)
PSR J1022+1001
Camilo, F., Nice, D. J., Shrauner, J. A., & Taylor, J. H. 1996, ApJ, 469, 819
• using Arecibo and Greenbank • first observed profile shape variations
“on a timescale of minutes” • limit to timing precision
3
![Page 4: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/4.jpg)
PSR J1022+1001
Kramer, M., Xilouris, K. M., Camilo, F., Nice, D., Lange, C., Backer, D. C., & Doroshenko, O. 1999, ApJ, 520, 324
• using Effelsberg • observed profile shape variations in
both time and frequency • EQUAD ~ 10 µs
4
![Page 5: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/5.jpg)
5
![Page 6: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/6.jpg)
6
Xilouris, K. M. 1991, A&A, 248, 323
Result in boost ~ 0.1
![Page 7: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/7.jpg)
7
![Page 8: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/8.jpg)
PSR J1022+1001
Ramachandran, R. & Kramer, M. 2003, A&A, 407, 1085
• using Westerbork = equatorial mount • therefore, no parallactic angle variation • does not imply instrumental stability!
– automatic gain controllers – phase drift
8
![Page 9: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/9.jpg)
PSR J1022+1001
Hotan, A. W., Bailes, M., & Ord, S. M. 2004, MNRAS, 355, 941
• using Parkes • no evidence for shape variations • timing r.m.s ~ 2.2 µs • χ2/Nfree ~ 1.4
9
![Page 10: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/10.jpg)
Template Matching
ϕ P(φ) = aS(φ+ ϕ) + b
P(ν) = aS(ν)e-i2πϕν + δ(ν)b
FFT
10
![Page 11: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/11.jpg)
11
![Page 12: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/12.jpg)
12
![Page 13: What’s the deal with PSR J1022+1001?](https://reader034.vdocument.in/reader034/viewer/2022042804/626878988c412d175409a1c8/html5/thumbnails/13.jpg)
Arrival Time Comparison
• 278 TOAS spanning 6.9 years 13