To investigate hierarchical models of galaxy formation and evolution it is important to have large samples of true satellites, extending to the faintest possible luminosities. We have used Ha narrow-band imaging to search for star-forming satellite galaxies around 143 field spiral galaxies comparable to the Milky Way and found 63 candidate satellites associated with 47 host galaxies. A subset of 12 candidate satellites and their 11 host galaxies were spectroscopically observed to test if the candidates were true satellites and bound to their host. This confirmed that Ha imaging is a reliable method for searching for faint satellites. Within the overall sample of 63 satellites only could be considered analogous with the LMC and X14 with the SMC.
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