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An HI Search for M81 Group Dwarf Galaxies

Published online by Cambridge University Press:  25 May 2016

W. Van Driel ,
R.C. Kraan-Korteweg ,
B. Binggeli  and
W.K. Huchtmeier
W. Van Driel
Affiliation:
Unité Scientifique Nançay, Observatoire de Paris, France
R.C. Kraan-Korteweg
Affiliation:
Astronomy Department, Universidad de Guanajuato, Mexico
B. Binggeli
Affiliation:
Astronomical Institute, University of Basel, Switzerland
W.K. Huchtmeier
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Germany

Extract

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The M81 group has great advantages for dwarf galaxy studies: it has about three times the dwarf content of the Local Group but is at only about a quarter of the Virgo cluster distance. We searched for HI in 23 optically selected dwarf members and possible members of the M81 group with the Nançay decimetric radio telescope in the velocity range of −529 to 1826 km s−1 with considerably better sensitivity (2–4 mJy rms.) than previous surveys. Half the objects observed are irregular dwarfs, expected to be HI-rich and detectable at Nançay if at the distance of the M81 group (4 Mpc).

Type
Local Group
Information
Symposium - International Astronomical Union , Volume 186: Galaxy Interactions at High and Low Redshift , 1999 , pp. 57
Copyright
Copyright © Kluwer 1999