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UGC 12840 is a lenticular galaxy located in the constellation of Pegasus. The redshift of this galaxy is estimated to be (z) 0.022[1] and it was first discovered by astronomers in September 1982 where they found it in the Pegasus Supercluster.[2] It is also categorized as an isolated galaxy.[3][4]

Description

UGC 12840 is a gas-rich face-on lenticular galaxy with an SB0 morphology.[5][2][6] The appearance of the galaxy looks almost round but the rotation velocity has a large projection of 100 kilometers per seconds.[6] There is also an outer H II ring structure with a diameter of 11.4 kiloparsecs, with further evidence of a nuclear emission line source described as bright.[5] The far-infrared emission of the galaxy has been estimated as 0.40 jansky at 100 micrometer (ɥm) detections.[7]

A study published in December 2003, has found UGC 12840 is a late-type galaxy. The total molecular gas mass has been estimated to be 8.25 Mʘ based on its carbon oxide (CO) line intensity with the heliocentric velocity of the lines calculated as 6,850 kilometers per seconds.[8] The center of the galaxy possibly displays noncircular gas motions. A giant ring is also detected in addition with a measured total radius of 12.5 kiloparsecs and has hydrogen-alpha emission.[6]

References

  1. ^ a b c d e f g h i j “NED Search results for UGC 12840”. NASA/IPAC Extragalactic Database. Retrieved 2026-05-15.
  2. ^ a b Focardi, P.; Marano, B.; Vettolani, G. (September 1982). “The south west extension of the Perseus supercluster”. ui.adsabs.harvard.edu. Retrieved 2026-05-15.
  3. ^ Karachentseva, V. E. (1973). “The Catalogue of Isolated Galaxies”. Astrof. Issledovanija Byu. Spec. Ast. Obs. 8: 3–49. Bibcode:1973AISAO…8….3K.
  4. ^ Haynes, M. P.; Giovanelli, R. (June 1984). “Neutral hydrogen in isolated galaxies. IV – Results for the Arecibo sample”. The Astronomical Journal. 89: 758. Bibcode:1984AJ…..89..758H. doi:10.1086/113573. ISSN 0004-6256.
  5. ^ a b Pogge, Richard W.; Eskridge, Paul B. (October 1993). “Star formation in the disks of H I-rich S0 galaxies”. The Astronomical Journal. 106: 1405. Bibcode:1993AJ….106.1405P. doi:10.1086/116735. ISSN 0004-6256.
  6. ^ a b c Sil’chenko, Olga K.; Moiseev, Alexei V.; Egorov, Oleg V. (2019-09-01). “The Gas Kinematics, Excitation, and Chemistry, in Connection with Star Formation, in Lenticular Galaxies”. The Astrophysical Journal Supplement Series. 244 (1): 6. arXiv:1907.07261. Bibcode:2019ApJS..244….6S. doi:10.3847/1538-4365/ab3415. ISSN 0067-0049.
  7. ^ Eskridge, Paul B.; Pogge, Richard W. (June 1991). “H I content and FIR emission of S0 galaxies”. The Astronomical Journal. 101: 2056. Bibcode:1991AJ….101.2056E. doi:10.1086/115829. ISSN 0004-6256.
  8. ^ Sauty, S.; Casoli, F.; Boselli, A.; Gerin, M.; Lequeux, J.; Braine, J.; Gavazzi, G.; Dickey, J.; Kazès, I.; Fouqué, P. (2003-11-17). “12CO(1–0) observation of isolated late-type galaxies” (PDF). Astronomy & Astrophysics. 411 (3): 381–390. doi:10.1051/0004-6361:20031399. ISSN 0004-6361.