Short answers, pulled from the story.
The Spindle Galaxy NGC 5866 sits in the constellation Draco and displays a visible disk component alongside a prominent bulge. This structure places it between an elliptical galaxy and a spiral galaxy within the Hubble classification scheme.
Determining the distinction between elliptical and lenticular galaxies relies heavily on velocity dispersion measurements. Lenticular galaxies possess much larger v over sigma ratios due to their non-negligible rotational velocities from the disk component compared to elliptical galaxies which typically show values less than 0.5 when epsilon equals 0.3.
NGC 1375 and NGC 1175 serve as examples of lenticular galaxies featuring box-shaped bulges. These objects are classified as SB0 pec due to their peculiar structural characteristics that appear mostly in edge-on spiral galaxies but rarely in lenticular types.
The Cartwheel Galaxy lies about 500 million light-years away within the constellation Sculptor while NGC 4608 sits roughly 56 million light years away in Virgo and features a barred structure. Many members reside within major clusters such as the Virgo Cluster or Fornax Cluster including NGC 1533 located in the constellation Dorado.
These objects possess little to no molecular gas which prevents significant hydrogen alpha emission and they also lack 21-cm emission lines typically used to trace cool gas in other galaxy types. Consequently astronomers must derive rough mass estimates from stellar absorption lines instead because these systems generally do not contain the emission lines found in normal disk galaxies.