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While massive black holes (MBHs) are known to inhabit all massive galaxies,their ubiquitous presence in dwarf galaxies has not been confirmed yet, withonly a limited number of sources detected so far. Recently, some studiesproposed infrared emission as an alternative way to identify MBHs in dwarfs,based on a similar approach usually applied to quasars. In this study, byaccurately combining optical and infrared data taking into account resolutioneffects and source overlapping, we investigate in detail the possiblelimitations of this approach with current ground-based facilities, finding aquite low ($\sim$0.4 per cent) fraction of active MBH in dwarfs that areluminous in mid-infrared, consistent with several previous results. Our resultssuggest that the infrared selection is strongly affected by several limitationsthat make the identification of MBHs in dwarf galaxies currently prohibitive,especially because of the very poor resolution compared to optical surveys, andthe likely contamination by nearby sources, although we find a few goodcandidates worth further follow-ups. Optical, X-ray and radio observations,therefore, still represent the most secure way to search for MBH in dwarfs.

Difficulties in Mid-Infrared selection of AGN in dwarf galaxies