Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..756k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 2, p. 756-764
Astronomy and Astrophysics
Astrophysics
52
Absorption Spectra, Emission Spectra, Hydrogen, Line Spectra, Neutral Atoms, Pulsars, Data Reduction, Distance, Electron Density (Concentration), Interstellar Matter, Kinematics, Line Of Sight, Microwave Spectra, Southern Sky
Scientific paper
To derive their kinematic distances and to study the interstellar medium, we have measured 21 cm absorption and emission spectra in the direction of eight southern pulsars with the Parkes telescope. For the first time we have successfully obtained H I absorption measurements for PSRs J0908-4913, J1453-6413, J1456-6843, and J1709-4429. We have also significantly improved the sensitivity and resolution on PSRs J0742-2822, J1001-5507, and J1056-6258, whose spectra have previously been measured. Furthermore, we obtained a high-quality absorption spectrum on an eight pulsar, PSR J1559-4438, whose previously determined spectrum was not usable for kinematic distance determinations due to frequency structure imposed by interstellar scintillation. We present our absorption and emission spectra for these eight pulsars, derive kinematic distances and electron densities along their lines of sight where possible, and compare our results with previous work. For PSRs J1001-5507 and J1056-6258 we see H I emission and absorption at velocities which cannot be explained by a simple rotation curve model. We present evidence to suggest that PSR J1056-6258 may be located behind the H II region BBW 328. We discuss the gamma-ray efficiency of PSR J1709-4429 and its association with a supernova remnant in light of our kinematic distance estimate. Additionally, we briefly examine the optical depths and the inferred spin temperatures of the interstellar gas clouds in the direction of some of the observed pulsars.
Johnston Simon
Koribalski Baerbel
Weisberg Joel M.
Wilson William W.
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