Decijansky Radio Flux BL Lacertae Objects

摘要

BL Lac objects with radio flux in the range of [1, 10] decijanskys (dJy) are defined as observational class "dJy." Because the radio fluxes of most radio-selected BL Lac objects (RBLs) are bigger than 1 Jy while the radio fluxes of most X-rayselected BL Lac objects (XBLs) are less than 1 dJy, we investigate whether the dJy class forms a bridge connecting RBLs and XBLs on the α_ro-α_ox color- color diagram. We compose a dJy sample by collecting dJy class sources from radio and X-ray surveys as well as other means of observation. Our study shows that the dJy sample so collected does not form a bridge connecting RBLs and XBLs. Instead, the sources of the sample are mainly distributed in the main domains of RBLs and XBLs.