Abstract by Rochelle Steele
Physics and Astronomy
J. Ward Moody
Surveying for void galaxies with new photometric methods
No astronomer has been able to observe the dwarf galaxies that current cosmological simulations predict should be abundant within voids in space. Spectroscopic observations are usually necessary to determine the distances to these galaxies, but the dwarf galaxies are so faint that it is difficult to observe them with this method. We have developed a new way to photometrically estimate distance using three narrow filters centered on a redshifted Ha emission line (corresponding to the distance of the observed void). Using this method, we have found one possible candidate dwarf galaxy within the void in question. This rejects the hypothesis that there is a uniform distribution of dwarf galaxies within the void (as suggested by simulations).