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Title:
An H I survey of Nilson dwarf galaxies. I - Observations
Authors:
Thuan, T. X.; Seitzer, P. O.
Affiliation:
AA(Virginia, University, Charlottesville, Va; CNRS, Institut d'Astrophysique, Paris, France), AB(Virginia, University, Charlottesville, Va.)
Publication:
Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 327-353. Research supported by the Research Corp., and Centre National de la Recherche Scientifique. (ApJ Homepage)
Publication Date:
07/1979
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Galactic Structure, Hydrogen Clouds, Line Shape, Microwave Emission, Radio Galaxies, Astronomical Catalogs, Hydrogen Atoms, Neutral Gases, Red Shift, Stellar Mass
DOI:
10.1086/157197
Bibliographic Code:
1979ApJ...231..327T

Abstract

Results are presented for 21-cm line observations of 461 galaxies classified as dwarfs in Nilson's (1973) catalog but not listed in the DDO dwarf catalog. A total of 145 galaxies were detected (31% detection rate), mostly within the velocity search interval from -400 to 3000 km/s. It is found that no Nilson dwarf has a velocity of less than 250 km/s, suggesting that the list of known neutral hydrogen-rich dwarf galaxies is probably complete for distances of no more than 3 Mpc, declinations of at least -2 deg 30 min, galactic latitudes of at least + or - 20 deg, and absolute photographic magnitudes no fainter than -10.5. Neutral hydrogen profiles and masses, redshift, total masses, and estimated apparent photographic magnitudes are provided for the detected galaxies, along with reasons for nondetections.

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