NGC 2950

NGC 2950
SDSS image of NGC 2950 (center)
Observation data (J2000 epoch)
ConstellationUrsa Major
Right ascension09h 42m 35.116s[1]
Declination58° 51′ 04.39″[1]
Redshift0.004410 ± 0.000017
Heliocentric radial velocity1,329[2] km/s
Distance49.84 ± 0.46 Mly (15.28 ± 0.14 Mpc)[2]
Apparent magnitude (B)11.93[2]
Characteristics
TypeRSB0(r)[3]
Apparent size (V)2′.7 × 1′.8[3]
Other designations
NGC 2950, UGC 5176, PGC 27765[4]
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NGC 2950 is a lenticular galaxy in the northern constellation of Ursa Major, about 50 million light years from the Milky Way and receding with a heliocentric radial velocity of 1,329 km/s.[2] It was discovered in 1790 by the Anglo-German astronomer William Herschel.[5] NGC 2950 is a field galaxy, it is not part of a galaxy cluster or galaxy group, and thus is gravitationally isolated.[6] Nine certain and four possible dwarf galaxies have been identified around NGC 2950.[7]

The morphological classification of this galaxy is RSB0(r),[3] indicating a barred lenticular galaxy (SB0) with outer (R) and inner (r) ring structures. It hosts two nested stellar bars; the rotation frequency of the secondary bar is higher than that of the primary one.[3] Double bars of this type are relatively common, having been found in ~30% of barred lenticulars. The inner bar appears to be counter-rotating relative to the outer bar,[8] with the two passing cleanly through each other.[9] The stellar mass of the galaxy is 1.7×1010 M☉ while the halo mass is 6.6×1011 M☉.[7]

  1. ^ a b Cite error: The named reference Skrutskie_et_al_2006 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Tully_et_al_2013 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Corsini_et_al_2003 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Seligman2016 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference ned was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Tanaka_et_al_2018 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Maciejewski2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Maciejewski2008 was invoked but never defined (see the help page).