The Low-Resolution DRAO Survey of H I Emission from the Galactic Plane

Details The Low-Resolution DRAO Survey of H I Emission from the Galactic Plane The Low-Resolution DRAO Survey of H I Emission from the Galactic Plane

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120.2471h&link_type=abstract

The Astronomical Journal, Volume 120, Issue 5, pp. 2471-2487.

Astronomy and Astrophysics

Astronomy

49

Galaxy: Kinematics And Dynamics, Ism: H I, Radio Emission Lines, Surveys

Scientific paper

A survey of H I line emission in the Galactic plane from Galactic longitude l=72.2d to 149° 0, and latitude b=-5.4d to 7.2d, has been made using the 26-m Telescope at the Dominion Radio Astrophysical Observatory. Spectra were observed at 0.2d intervals of longitude and latitude, providing a survey which is fully sampled in the spatial domain. A detailed study of the antenna characteristics of the telescope allowed the correction of the spectra for stray radiation. The spectral resolution is 1.32 km s-1, and the LSR velocity range is -260 to 161 km s-1. The final spectra have an estimated Tb scaling accuracy of 1% and an estimated rms noise in one channel (0.8245 km s-1) of 0.25 K. A region of suspected strong H I self-absorption at l~92deg, b~3deg, has been identified. Comparison with spectra from the Leiden/Dwingeloo Survey is used to estimate the overall accuracy of the stray radiation corrections. This comparison also shows that a small percentage (~1%) of the spectra in the latter survey suffer from calibration errors exceeding 10%. A table of positions of the more discordant spectra is given.

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