Dwarf galaxies near NGC 1023
Open Access
- 1 March 1984
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 207 (2) , 173-184
- https://doi.org/10.1093/mnras/207.2.173
Abstract
An optical and H I study has been made of four dwarf galaxies near NGC 1023. Single-beam and aperture-synthesis data are given for the H I emission from all four galaxies and 4-m prime-focus plates have been taken of the field. Photoelectric photometry and intensified image-dissector-scanner spectral observations have been made of three of the objects. Knots are seen in each of the dwarfs; these could be supergiants at the plate limit. The spectrum of galaxy B indicates that it has a substantial stellar component with an age of ≲ 109 yr. Galaxy C shows emission features which imply that it contains star-forming regions ≲ 7 × 106 yr old. These results are suggestive of star bursts on a small scale. The integrated properties of the dwarf galaxies (MH, MT, L) are continuous with those of more luminous galaxies. The ratios MH/L and MH/MT increase logarithmically over the range MB = −20.5 to −13.0. MT/L does not change significantly over this range.Keywords
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