(Left) Estimated CO(1−0) line luminosities as a function of the line widths (Δ v_FWHM) for the ASPECS sources, compared to a compilation of galaxies from the literature detected in CO line emission, including unlensed submillimeter galaxies (Frayer et al. 2008; Coppin et al. 2010; Carilli et al. 2011; Riechers et al. 2011, 2014; Thomson et al. 2012; Bothwell et al. 2013; Hodge et al. 2013; Ivison et al. 2013, 2011; De Breuck et al. 2014) and MS galaxies (Daddi et al. 2010b; Magnelli et al. 2012; Magdis et al. 2012, 2017; Tacconi et al. 2013; Freundlich et al. 2019). The dashed lines represent a simple “virial” functional form for the CO luminosity for a compact starburst and an extended disk (Section 3.2). The actual location of each of these lines depends on the choice of geometry and α_CO factor. (Right) Stellar masses vs. line widths for the ASPECS sources, compared to the literature (where stellar mass estimates are available).