H I absorption measurements of seven low-latitude pulsars

Details H I absorption measurements of seven low-latitude pulsars H I absorption measurements of seven low-latitude pulsars

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88...84w&link_type=abstract

Astronomy and Astrophysics, vol. 88, no. 1-2, Aug. 1980, p. 84-93.

Astronomy and Astrophysics

Astrophysics

46

Absorption Spectra, Electron Density (Concentration), Hydrogen Atoms, Pulsars, Spectrum Analysis, Dispersing, Distance, Galactic Rotation, Gas Ionization, Gum Nebula, Ionizing Radiation, Milky Way Galaxy, Neutral Particles, Stellar Models, Supernova Remnants

Scientific paper

The neutral hydrogen absorption spectra of seven low-latitude pulsars are measured and used to estimate their distances and mean electron densities along the lines of sight. Calculations made in terms of the Schmidt (1965) galactic rotation model on the basis of the spectral observations made using the Arecibo 305-m telescope indicate that pulsars 1919+21 and 1929+10 are within 1.5 kpc of the earth and pulsars 2016+28 and 2020+28 are further than 1.3 kpc. Considerations of absorption spectra, dispersion and rotation measurements and Stromgren spheres along the line of sight indicate that PSR 0525+21 is approximately as distant as the Crab Nebula pulsar (2 kpc), while PSR 0540+23 is more distant. Absorption in PSR 0611+22 is found to be similar to that of the nearby supernova remnant IC 443, but the resemblance may be due to the small change of velocity with distance in the direction of the anticenter. The dispersion measured and distances of 32 known pulsars indicates extended regions of enhanced electron density in the inner part of the Galaxy and the Gum Nebula, with electron density elsewhere generally between 0.02 and 0.03/cu cm. Possible sources of the ionization include stellar UV radiation.

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