Neutral hydrogen toward M33 - 21 CM emission/absorption observations

Details Neutral hydrogen toward M33 - 21 CM emission/absorption observations Neutral hydrogen toward M33 - 21 CM emission/absorption observations

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..139g&link_type=abstract

Astronomical Journal, vol. 85, Feb. 1980, p. 139-144.

Astronomy and Astrophysics

Astronomy

Hydrogen Clouds, Radio Astronomy, Radio Sources (Astronomy), Spiral Galaxies, Hydrogen Atoms, Milky Way Galaxy, Telescopes

Scientific paper

Observations with the 1000 ft telescope of Arecibo Observatory were made toward 4C29.03 and OC 253, the two strongest small-diameter radio sources near the spiral galaxy M33. The upper limit on absorption toward 4C29.03 is τ < 0.009, leading to a lower limit on the gas temperature Ts > 20 K at a point ∼16 kpc from the center of M33. Hydrogen in the Milky Way produces absorption toward 4C29.03 which is similar to the absorption toward 3C48, ∼3° away. Toward OC 253 there is an H I emission feature in M33, containing 2.5 × 105 Msun of hydrogen. We speculate that the radio source OC 253 may be associated with M33, rather being a background source.

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