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OGC 586 also known as 2MASX J11535621+4923562, is a massive spiral galaxy located in the constellation of Ursa Major. The redshift of the galaxy is estimated to be (z) 0.166[1] and it is classified as a super spiral galaxy; a class of star-forming disk galaxies that are found to be much more massive.[2]

Description

OGC 586 is a brightest cluster galaxy (BCG) of the galaxy cluster called the OGC 586 Cluster located at the same redshift and named after the galaxy itself. The apparent luminosity has been estimated as Lr = 2.8 and the total isophotal diameter has been calculated as 90.2 kiloparsecs. In addition, it is also categorized as a Seyfert galaxy of Type 2, with an active galactic nucleus (AGN). The bulge fraction ratio has been estimated as B/T = 0.17, with the galactic disk showing a disk inclination of 63° and orientated at a position angle of 144°. The disk exponential scale length is Rd = 15.67.[3]

The total star formation rate of the galaxy is 1.58 Mʘ per year based on a calculation of a 12 micrometer band system by Wide-field Infrared Survey Explorer (WISE) with the total mass of the stars estimated to be 11.64 Mʘ based on its W-1 band luminosity.[2] Studies also found it is located in a dense galaxy environment with at least 14 or more companions within a 150 kiloparsec radius.[4]

The inclination angle of OGC 586 is 66° based on the calculation of its z-band axial ratio. The major axis position angle is orientated at 128°, with the flat part of the rotation curve displaying a velocity of 338 ± 27 kilometers per second.[5] The galaxy has a compact disk of cold gas.[6] The total mass of the gas is 10.8 Mʘ. The disk may also be warped, based on a change of its regular rotation, with the deprojected maximum rotation speed being vmax = 305 kilometers per seconds.[2]

References

  1. ^ a b c d e f g h i “NED Search results for OGC 186”. NASA/IPAC Extragalactic Database. Retrieved 2026-05-23.
  2. ^ a b c Ogle, Patrick M.; Jarrett, Thomas; Lanz, Lauranne; Cluver, Michelle; Alatalo, Katherine; Appleton, Philip N.; Mazzarella, Joseph M. (2019-10-07). “A Break in Spiral Galaxy Scaling Relations at the Upper Limit of Galaxy Mass”. The Astrophysical Journal Letters. 884 (1): L11. arXiv:1909.09080. Bibcode:2019ApJ…884L..11O. doi:10.3847/2041-8213/ab459e. ISSN 2041-8205.
  3. ^ Ogle, Patrick M.; Lanz, Lauranne; Nader, Cyril; Helou, George (2016-01-26). “Superluminous Spiral Galaxies”. The Astrophysical Journal. 817 (2): 109. arXiv:1511.00659. Bibcode:2016ApJ…817..109O. doi:10.3847/0004-637x/817/2/109. ISSN 0004-637X.
  4. ^ Ogle, Patrick M.; Lanz, Lauranne; Appleton, Philip N.; Helou, George; Mazzarella, Joseph (2019-07-15). “A Catalog of the Most Optically Luminous Galaxies at z < 0.3: Super Spirals, Super Lenticulars, Super Post-mergers, and Giant Ellipticals”. The Astrophysical Journal Supplement Series. 243 (1): 14. arXiv:1904.02806. Bibcode:2019ApJS..243…14O. doi:10.3847/1538-4365/ab21c3. ISSN 1538-4365.
  5. ^ Di Teodoro, Enrico M; Posti, Lorenzo; Ogle, Patrick M; Fall, S Michael; Jarrett, Thomas (2021-09-11). “Rotation curves and scaling relations of extremely massive spiral galaxies”. Monthly Notices of the Royal Astronomical Society. 507 (4): 5820–5831. doi:10.1093/mnras/stab2549. ISSN 0035-8711.
  6. ^ Cologni, R.; Salomé, P.; Le Borgne, D.; Guillard, P.; Boquien, M. (December 2025). “Failed quenching in massive spiral galaxies” (PDF). SF2A-2025: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: A. Siebert, K. Baillié, M. Béthermin, F. Cantalloube, E. Josselin, N. Lagarde, J. Malzac, J. Richard, L. Selliez, O. Venot, held 1-4 July, 2025 at INP-ENSEEIHT, Toulouse, France: 429–432. Bibcode:2025sf2a.conf..429C.