II Zwicky 28

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II Zwicky 28
II Zwicky 28.jpg
Ring galaxy II Zwicky 28 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation Orion
Right ascension 05h 01m 42.0s
Declination +03° 34′ 28″
Redshift 0.028630 +/- 0.000060 [1]
Helio radial velocity 8583 +/-18 km/s [1]
Distance 390 Mly
(120 mpc) [1]
Apparent magnitude  (V)15.5
Characteristics
Type S pec (Ring)
Apparent size  (V)0.3' x 0.3' [1]
Other designations
VV 790b, 2MASX J05014205+0334278, PGC 016572

II Zwicky 28 is an interacting ring galaxy at a distance of approximately 390 million light-years. The sparkling pink and purple loop in Zw II 28 is not a typical ring galaxy due to the fact that it does not seem to have the usual visible central companion. [2] For many years it was thought to be a lone circle on the sky, but observations using the Hubble Space Telescope have shown that there may be a possible companion lurking just inside the ring, where the loop appears to double back on itself. [2]

The galaxy is only a faint IRAS source, which may indicate a lower level of star formation than other rings, however it has a high Hα luminosity, similar to other ring galaxies. It displays strong Balmer absorption lines interior to the ring, and it is possible that a major burst of star formation has recently occurred, using up a large fraction of the galaxy's molecular reservoir, and depleting its dust content. [3]

Its bright foreground star is about 1585 light-years away.

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References

  1. 1 2 3 4 "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2020-05-29.
  2. 1 2 "NASA - Hubble Gazes on One Ring to Rule Them All". www.nasa.gov. Retrieved 2020-05-29.
  3. ↑ "Collisional Ring Galaxies - P.N. Appleton & C. Struck-Marcell". ned.ipac.caltech.edu. Retrieved 2020-05-29.


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