Editing Lenticular galaxy (section)

{{Short description|Class of galaxy between an elliptical galaxy and a spiral galaxy}}
{{redirect|S0s|other uses|S0 (disambiguation){{!}}S0}}
[[File:Ngc5866 hst big.png|thumb|upright=1.2|The [[NGC 5866|Spindle Galaxy]] (NGC 5866), a lenticular galaxy in the [[Draco (constellation)|constellation Draco]].  This image shows that lenticular galaxies may retain a considerable amount of dust in their disk. However, there is little to no gas, and thus they are considered deficient in [[interstellar matter]].]]

A '''lenticular galaxy''' (denoted S0) is a [[Galaxy morphological classification|type of galaxy]] intermediate between an [[elliptical galaxy|elliptical]] (denoted E) and a [[spiral galaxy]] in [[galaxy morphological classification]] schemes.<ref name="butaetal2007">{{cite book
  |author1=R. J. Buta |author2=H. G. Corwin, Jr. |author3=S. C. Odewahn | date=2007s
  | title=The de Vaucouleurs Atlas of Galaxies
  | publisher=Cambridge University
  | location=Cambridge
  | isbn=978-0521820486}}</ref> It contains a large-scale disc but does not have large-scale spiral arms.  Lenticular galaxies are [[Disc galaxy|disc galaxies]] that have used up or lost most of their [[interstellar matter]] and therefore have very little ongoing [[star formation]].<ref name="DeGraaffetal2007">{{cite journal
  |author1=DeGraaff, Regina Barber |author2=Blakeslee, John P. |author3=Meurer, Gerhardt R. |author4=Putman, Mary E. | title = A Galaxy in Transition: Structure, Globular Clusters, and Distance of the Star-Forming S0 Galaxy NGC 1533 in Dorado
  | journal = The Astrophysical Journal
  | date = December 2007
  | volume = 671
  | issue = 2
  | pages = 1624–1639
  | bibcode = 2007ApJ...671.1624D
  | doi = 10.1086/523640
 |arxiv=0710.0893|s2cid=14312626 }}</ref> They may, however, retain significant dust in their disks. As a result, they consist mainly of aging stars (like [[elliptical galaxies]]).  Despite the morphological differences, lenticular and elliptical galaxies share common properties like spectral features and scaling relations. Both can be considered early-type galaxies that are passively evolving, at least in the local part of the Universe.  Connecting the E galaxies with the S0 galaxies are the ES galaxies with intermediate-scale discs.<ref>Liller, M.H. (1966), [http://adsabs.harvard.edu/abs/1966ApJ...146...28L The Distribution of Intensity in Elliptical Galaxies of the Virgo Cluster. II]</ref>