Molecular Gas and Star Formation Within Galaxies in the Bootes Void

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Abstract

Carbon monoxide emission was detected from four galaxies in the Bootes Void, which were selected on the basis of their IRAS 100 μm fluxes. The properties of void galaxies have often been predicted to be rather different from field galaxies. We find that the molecular and infrared properties of the observed galaxies are very similar to those of interacting field galaxies, rather than the relatively unevolved galaxies that have been predicted. A recent study of H I emission from Bootes Void galaxies (Szomoru et al. 1996, AJ, 111, 2141; 111, 2150) found that the atomic gas properties were similar to those of galaxies in the field, from which they concluded that only the very local environment, not the global environment of the void, is important for affecting their evolution. Taken together, the CO and H I results are not consistent with previous theoretical expectations. These results do, however, seem more consistent with the idea that there is little luminous matter in voids, and the luminous matter present is clustered in the filaments and sheets that run through the voids. In that picture, evolution would be driven by the local environment, and not by the global underdensity of the region.

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