NGC 2139

NGC 2139
Legacy Surveys DR10 image of NGC 2139
Observation data (J2000 epoch)
ConstellationLepus
Right ascension06h 01m 07.963s[1]
Declination−23° 40′ 20.35″[1]
Redshift0.006148±0.000017[2]
Heliocentric radial velocity1,836 km/s[3]
Galactocentric velocity1,649 km/s[3]
Distance120.6 Mly (36.98 Mpc)[3]
Apparent magnitude (V)11.6[4]
Apparent magnitude (B)11.98[3]
Characteristics
TypeSAB(rs)cd[5]
Number of stars9.1×109 M☉[5]
Apparent size (V)2.40′ × 1.9′[4]
Notable featuresBulgeless
Other designations
NGC 2139, IC 2154, LEDA 18258, MCG -04-15-005, PGC 18258[6]

NGC 2139 is a barred spiral galaxy in the constellation of Lepus.[4] It was discovered on November 17, 1784, by the German-English astronomer William Herschel.[7] The galaxy is located at a distance of 120.6 million light-years (36.98 Mpc) from the Sun and is receding with a radial velocity of 1,836 km/s.[3]

The overall form of this galaxy is irregular with spiral arms and the appearance of tidal features, suggesting a potential recent merger event. There is no central bulge of significance.[8] The morphological classification is SAB(rs)cd,[5] which indicates a barred spiral galaxy (SAB) with a transitional inner ring structure (rs) and loosely wound spiral arms (cd). It is a star forming galaxy with a formation rate of 3.8 M☉·yr−1.[5] There is a plume extending to the south of the galaxy.[8]

A luminous filament runs through the center of the galaxy, which includes a small nuclear cluster. This cluster is only 4.1×107 years old with a mass of 8.3×105 M☉.[8] It is offset at a distance of 320 pc from the center of the galaxy and may come to rest there on a time scale of around 100 million years.[9] The cluster is a source of X-ray emission.[10]

  1. ^ a b Cite error: The named reference Skrutskie_et_al_2006 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference De_Vaucouleurs_et_al_1991 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Tully_et_al_2016 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Frommert was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Mineo_et_al_2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference cseligman was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Shields_et_al_2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Andersen_et_al_2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Shields_et_al_2010 was invoked but never defined (see the help page).