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NGC 959 is a spiral galaxy in the northern constellation of Triangulum.[10] It was discovered on November 9, 1876, by French astronomer Édouard Stephan.[9] This galaxy is located at a distance of 36 million light years and is receding with a heliocentric radial velocity of 596 km/s.[2] It is a member of the NGC 1023 Group of galaxies.[4]

NGC 959
Observation data (J2000 epoch)
ConstellationTriangulum
Right ascension02h 32m 23.923s[1]
Declination+35° 29′ 40.46″[1]
Helio radial velocity596 km/s[2]
Distance36 Mly (11.0 Mpc)[2][3]
Group or clusterNGC 1023 Group[4]
Apparent magnitude (V)12.38±0.14[3]
Apparent magnitude (B)12.95±0.14[3]
Characteristics
TypeSdm:[3] or SBcd[5]
Mass6.3×108[6] (stellar) M☉
Size21.8 kly (6.69 kpc)[7]
Apparent size (V)2′.3 × 1′.4[3] (D25)
Other designations
IRAS 02293+3516, NGC 959, UGC 2002, LEDA 9665, MCG +06-06-051, PGC 9665[8][9]

The morphological class of this galaxy is Sdm:,[3] indicating it is a spiral (S) with disorganized, irregular arms and no central bulge (dm). The ':' suffix indicates some uncertainty about the classification. It has a visual magnitude of 12.4.[3] The galactic plane is inclined at an angle of 50° to the line of sight from the Earth,[11] giving it an elliptical profile with the major axis aligned along a position angle of 65°. The size of the D25 ellipse (where the brightness of the galaxy drops to magnitude 25) is 2.3 × 1.4 arcminutes.[3]

When images of NGC 959 are corrected for the effects of extinction from dust, a central bar feature can be discerned. The galaxy then shows a non-negligible bulge or central condensation, and may instead have a morphological type of SBcd.[5] It displays a cuspy central density profile and bulge-like monotonic decrease in ellipticity toward the core.[6]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Tully, R. Brent; et al. (August 2016), "Cosmicflows-3", The Astronomical Journal, 152 (2): 21, arXiv:1605.01765, Bibcode:2016AJ....152...50T, doi:10.3847/0004-6256/152/2/50, 50.
  3. Gil de Paz, Armando; et al. (December 2007), "The GALEX Ultraviolet Atlas of Nearby Galaxies", The Astrophysical Journal Supplement Series, 173 (2): 185–255, arXiv:astro-ph/0606440, Bibcode:2007ApJS..173..185G, doi:10.1086/516636, S2CID 119085482.
  4. Trentham, Neil; Tully, R. Brent (September 2009), "Dwarf galaxies in the NGC 1023 Group", Monthly Notices of the Royal Astronomical Society, 398 (2): 722–734, arXiv:0906.2540, Bibcode:2009MNRAS.398..722T, doi:10.1111/j.1365-2966.2009.15189.x.
  5. Tamura, K.; et al. (June 2010), "Lifting the Veil of Dust from NGC 0959: The Importance of a Pixel-based Two-dimensional Extinction Correction", The Astronomical Journal, 139 (6): 2557–2565, arXiv:1004.3575, Bibcode:2010AJ....139.2557T, doi:10.1088/0004-6256/139/6/2557.
  6. Relatores, Nicole C.; et al. (December 2019), "The Dark Matter Distributions in Low-mass Disk Galaxies. II. The Inner Density Profiles", The Astrophysical Journal, 887 (1): 23, arXiv:1911.05836, Bibcode:2019ApJ...887...94R, doi:10.3847/1538-4357/ab5305, 94.
  7. Truong, Phuongmai N.; et al. (July 2017), "High-resolution Velocity Fields of Low-mass Disk Galaxies. I. CO Observations", The Astrophysical Journal, 843 (1): 15, Bibcode:2017ApJ...843...37T, doi:10.3847/1538-4357/aa76eb, 37.
  8. "NGC 959". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-01-18.{{cite web}}: CS1 maint: postscript (link)
  9. Seligman, Courtney, "NGC Objects: NGC 950 - 999", Celestial Atlas, retrieved 2022-01-18.
  10. Aranda, Ted (2011), 3,000 Deep-Sky Objects, An Annotated Catalogue, Springer New York, p. 92, ISBN 9781441994196.
  11. Esipov, V. F.; et al. (October 1991), "UBVR Photometry and Rotation of Late Type Galaxies - NGC959 NGC1156 NGC1160 NGC6643 and NGC7292", Soviet Astronomy, 35 (5): 452, Bibcode:1991SvA....35..452E.


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На других языках

[de] NGC 959

NGC 959 ist eine spiralförmige Zwerggalaxie mit ausgedehnten Sternentstehungsgebieten vom Hubble-Typ Sd im Sternbild Dreieck am Nordsternhimmel. Sie ist schätzungsweise 32 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 20.000 Lj. Die Galaxie gilt als Mitglied der NGC 1023-Gruppe. Im selben Himmelsareal befindet sich die Galaxie NGC 952.
- [en] NGC 959

[ru] NGC 959

NGC 959 (другие обозначения — UGC 2002, MCG 6-6-51, ZWG 523.55, KUG 0229+352, IRAS02293+3516, PGC 9665) — спиральная галактика (Sd) в созвездии Треугольник. Открыта Эдуардом Стефаном в 1876 году. Описание Дрейера: «очень тусклый, довольно крупный, возможно, туманный объект, к юго-западу видна звезда 9-й величины»[4].


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