NGC 3741

NGC 3741 is an irregular galaxy in the constellation Ursa Major. It was discovered by John Herschel on March 19, 1828.[4] At a distance of about 10 million light-years (3.2 Mpc), it is located in the M94 Group.[3] It is relatively undisturbed by other galaxies.[3]

NGC 3741
Hubble Space Telescope image of NGC 3741
Observation data (J2000 epoch)
ConstellationUrsa Major
Right ascension11h 36m 05s[1]
Declination+45° 17′ 02″[1]
Redshift0.000764[2]
Heliocentric radial velocity229 ± 4 km/s[2]
Distance10 Mly (3.2 Mpc)[3]
Apparent magnitude (V)14.23[1]
Apparent magnitude (B)14.55[1]
Characteristics
TypeImIII/BCD[2]
Other designations
NGC 3741, UGC 6572, MCG +08-21-068, PGC 35878, SDSS J113605.75+451702.9[1]

NGC 3741 is an unusual galaxy in several aspects. It has a disk of neutral hydrogen (H I) that is extremely wide, extending some 23,000 light-years (7 kpc). The disk is strongly but symmetrically warped.[5] With a mass-to-light ratio of MT/LB ~ 149, it is highly rich in dark matter.[6]

NGC 3741 has a central bar and a faint spiral arm rich in H I. The bar rotates slowly, likely due to interaction with the dark matter.[7] The bar and spiral arms would make NGC 3741 a low-luminosity spiral galaxy.[3] The unusual properties could be explained if NGC 3741 were a late-stage merger between a low-mass companion or if it accreted mass from the intergalactic medium.[3]

References
  1. "NGC 3741". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 May 2019.
  2. "NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2018-12-27.
  3. Annibali, F.; Bacchini, C.; Iorio, G.; Bellazzini, M.; Pascale, R.; Beccari, G.; Cignoni, M.; Ciotti, L.; Nipoti, C.; Sacchi, E.; Tosi, M.; Cusano, F.; Bisogni, S.; Gargiulo, A.; Paris, D. (2022). "The Smallest Scale of Hierarchy Survey (SSH) – II. Extended star formation and bar-like features in the dwarf galaxy NGC 3741: Recent merger or ongoing gas accretion?". Monthly Notices of the Royal Astronomical Society. 512 (2): 1781–1794. arXiv:2202.11734. Bibcode:2022MNRAS.512.1781A. doi:10.1093/mnras/stac541.
  4. Seligman, Courtney. "New General Catalog Objects: NGC 3700 - 3749". cseligman.com. Retrieved 23 May 2019.
  5. Gentile, G.; Salucci, P.; Klein, U.; Granato, G. L. (2007). "NGC 3741: The dark halo profile from the most extended rotation curve". Monthly Notices of the Royal Astronomical Society. 375 (1): 199–212. arXiv:astro-ph/0611355. Bibcode:2007MNRAS.375..199G. doi:10.1111/j.1365-2966.2006.11283.x. S2CID 18818325.
  6. Begum, Ayesha; Chengalur, Jayaram N.; Kennicutt, Robert C.; Karachentsev, Igor D.; Lee, Janice C. (2007). "Life in the last lane: Star formation and chemical evolution in an extremely gas rich dwarf". Monthly Notices of the Royal Astronomical Society. 383 (2): 809–816. arXiv:0711.1588. Bibcode:2008MNRAS.383..809B. doi:10.1111/j.1365-2966.2007.12592.x. S2CID 16348749.
  7. Banerjee, Arunima; Patra, Narendra Nath; Chengalur, Jayaram N.; Begum, Ayesha (2013). "A slow bar in the dwarf irregular galaxy NGC 3741". Monthly Notices of the Royal Astronomical Society. 434 (2): 1257–1263. arXiv:1308.3029. Bibcode:2013MNRAS.434.1257B. doi:10.1093/mnras/stt1083.
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