Statistics of neutral hydrogen absorption toward pulsars

Details Statistics of neutral hydrogen absorption toward pulsars Statistics of neutral hydrogen absorption toward pulsars

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..332d&link_type=abstract

Astronomy and Astrophysics, vol. 101, no. 3, Sept. 1981, p. 332-341.

Astronomy and Astrophysics

Astronomy

33

Hydrogen Atoms, Interstellar Gas, Neutral Gases, Pulsars, Stellar Radiation, Stellar Spectra, Absorption Spectra, Emission Spectra, Interstellar Extinction, Radio Astronomy, Spatial Distribution, Spectrum Analysis

Scientific paper

This paper presents mew spectra of the absorption of pulsar radiation by interstellar HI observed from Arecibo. These pulsars are at high and intermediate galactic latitudes. These data supplement the results toward low latitude pulsars for the study of the spatial distribution of the absorbing gas. The abundance of 21-cm absorption lines of various optical depths is found to be the same toward pulsars as toward extragalactic background sources. This result shows that the angular sizes of the background sources do not influence the optical depths measured in 21-cm absorption surveys. The 21-cm opacities measured in the solar neighborhood by high latitude surveys are typical of opacities in the galactic plane averaged over paths as long as 10 kpc toward pulsars. Variations of the ratio of the integral of 21-cm optical depth to dispersion measure are used to study the spatial distribution of absorbing gas. For distribution in z, the data do not allow a conclusive distinction between a Gaussian and an exponential form. Variations of the ratio as a function of pulsar distance reveal the statistical properties of the inhomogeneities of both the absorbing gas and the dispersive medium. From these we infer the relative dumpiness of the dispersive gas and the absorbing gas. Neither one can be very smoothly distributed.

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