Multi-epoch H I line measurements of four southern pulsars
نویسندگان
چکیده
منابع مشابه
Multi-epoch H i line measurements of 4 southern pulsars
We have measured 21-cm absorption spectra in the direction of three southern pulsars, PSRs B0736–40, B1451–68 and B1641–45, in three separate epochs spread over 2.5 yr. We see no evidence for any changes in the absorption spectra over this time span in spite of good velocity resolution and sensitivity. Towards PSR B1641–45 we place an upper limit of 10 cm on the change in the column density of ...
متن کاملH i line measurements of pulsars towards the Galactic Centre and the electron density in the inner Galaxy
We have measured 21-cm absorption and emission spectra in the direction of a further 7 southern pulsars with the Parkes telescope to derive their kinematic distances and to study the interstellar medium. For the first time we have successfully obtained H i absorption measurements for PSRs J1602–5100, J1740–3015 and J1745–3040. We have also significantly improved the sensitivity and resolution o...
متن کاملNeutron Star Mass Measurements. I. Radio Pulsars
There are now about fifty known radio pulsars in binary systems, including at least five in double neutron star binaries. In some cases, the stellar masses can be directly determined from measurements of relativistic orbital effects. In others, only an indirect or statistical estimate of the masses is possible. We review the general problem of mass measurement in radio pulsar binaries, and crit...
متن کاملTiming Measurements and Their Implications for Four Binary Millisecond Pulsars
We present timing observations of four millisecond pulsars, using data obtained over three years at the ATNF Parkes and NRAL Jodrell Bank radio telescopes. Astrometric, spin, and binary parameters are updated, and substantially improved for three pulsars, PSRs J0613−0200, J1045−4509 and J1643−1224. We have measured the time variation of the projected semi-major axis of the PSR J0437−4715 orbit ...
متن کاملSpectra of Southern Pulsars
We compare the spectral properties of the millisecond and slow pulsars detected in the Parkes 70 cm survey. The mean spectral index for the millisecond pulsars (MSPs) is –1.9±0.1 whereas the mean spectral index for the slow pulsars is a surprisingly steep –1.72±0.04. A Kolmogorov-Smirnov test indicates that there is only a 72% probability that the two distributions differ. As a class, MSPs are ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06468.x