NGC 4026 is an edge-on
lenticular galaxy in the constellation
Ursa Major. It is located at a distance of circa 50 million
light years from Earth, which, given its apparent dimensions, means that NGC 4026 is about 80,000 light years across. It was discovered by
William Herschel on April 12, 1789.
NGC 4026 belongs to
M109 Group,[3] the largest subgroup of galaxies with the
Ursa Major Cluster.[4] In the vicinity of NGC 4026 lie some low surface brightness
spiral galaxies, UGC 6917 (42 arcminutes from NGC 4026), UGC 6922 (26 arcminutes from NGC 4026) and UGC 6956 (10 arcminutes from NGC 4026).[5]
NGC 4026 appears disturbed in
HI imaging, with a filament extending southward. The mass of HI in NGC 4026 is below 0.71 × 108 M⊙.[5] The total HI mass in NGC 4026, UGC 6956 and the HI filament is estimated to be 7.94 × 108 M⊙.[6] This phenomenon has been studied and evidence implies the presence of tidal forces and tidal interactions between the galaxies. [7]
^Johannsen, Tim; Psaltis, Dimitrios; Gillessen, Stefan; Marrone, Daniel P.; Özel, Feryal; Doeleman, Sheperd S.; Fish, Vincent L. (10 October 2012). "Masses of Nearby Supermassive Black Holes with Very Long Baseline Interferometry". The Astrophysical Journal. 758 (1): 30.
arXiv:1201.0758.
Bibcode:
2012ApJ...758...30J.
doi:
10.1088/0004-637X/758/1/30.
S2CID1129745.
^Pak, Mina; Rey, Soo-Chang; Lisker, Thorsten; Lee, Youngdae; Kim, Suk; Sung, Eon-Chang; Jerjen, Helmut; Chung, Jiwon (September 2014). "The properties of early-type galaxies in the Ursa Major cluster". Monthly Notices of the Royal Astronomical Society. 445 (1): 630–647.
arXiv:1409.3070.
Bibcode:
2014MNRAS.445..630P.
doi:
10.1093/mnras/stu1722.
S2CID119217518.
^Wolfinger, K.; Kilborn, V. A.; Koribalski, B. S.; Minchin, R. F.; Boyce, P. J.; Disney, M. J.; Lang, R. H.; Jordan, C. A. (10 November 2012). "A blind H I survey in the Ursa Major region". Monthly Notices of the Royal Astronomical Society. 428 (2): 1790–1817.
arXiv:1210.2727.
Bibcode:
2013MNRAS.428.1790W.
doi:
10.1093/mnras/sts160.
S2CID118614368.
^P. N. Appleton, Extended H I emission associated with the low-surface-brightness companions of the S0 galaxy NGC 4026, Monthly Notices of the Royal Astronomical Society, Volume 203, Issue 2, June 1983, Pages 533–544,
https://doi.org/10.1093/mnras/203.2.533