Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..26...11g&link_type=abstract
The Messenger, vol. 26, p. 11-14
Astronomy and Astrophysics
Astrophysics
Magellanic Clouds
Scientific paper
Deep monochromatic photographs through narrow-band interterence filters on nearby spiral galaxies reveal large numbers (50-100) of circular shaped H 1I regions, with usually weak or absent central emission. They are called by various names; ares, loops, rings, shells, etc...., and are clearly the two-dimensional projections of more or less spherical bubbles of ionized gas. This is by no means a new phenomenon: Hubble (1925, Astrophysical Journal 62, 409) had already described three "ring nebulae" in the spiral of the Local Group NGC 6822. But it is the advent of large narrow-band interference filters that had made possible the detection of tens of bubbles in the galaxies in our vicinity. A number of surveys have recently been published, including one by Sivan (1974, Astronomy and Astrophysics Suppl. 16, 163) of our Galaxy with a 1-m telescope and one of M 33 with the Soviet 6-m telescope (Courtes et al., 1981, The Messenger No. 23).
Georgelin Yvon
Laval A.
Monnet Guy
Rosado Margarita
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