Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...78..365h&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 78, Feb. 1992, p. 365-390.
Astronomy and Astrophysics
Astronomy
32
Radio Astronomy, Sky Surveys (Astronomy), Astronomical Catalogs, Astronomical Maps, Galactic Structure, Milky Way Galaxy, Universe, Very Large Array (Vla)
Scientific paper
This study presents a pilot survey for galaxies at 21 cm conducted with the NRAO 300-ft telescope, which was performed to test the feasibility of finding unseen galaxies through the detection of the radiation emitted by neutral hydrogen. The 21-cm galaxies were investigated to determine whether these galaxies differ from optically collected samples. H I mapping of all the uncataloged galaxies, and a few of the cataloged sources, was done at the VLA to determine accurately the galaxies' H I line widths and masses. A region of galactic underdensity, or cosmic void, was evident in the data. It is inferred that voids are not filled by low surface brightness, dwarf galaxies, but rather are truly lacking in bright and faint galaxies. Results of the single-dish and the VLA studies are presented, and the appearance of large-scale structures in the data is discussed.
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