II Zwicky 28
| II Zwicky 28 | |
|---|---|
 Ring galaxy II Zwicky 28 imaged by theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Constellation | Orion |
| Right ascension | 05h01m42.0s |
| Declination | +03° 34′ 28″ |
| Redshift | 0.028630 +/- 0.000060[1] |
| Heliocentric radial velocity | 8583 +/-18 km/s[1] |
| Distance | 390Mly (120mpc)[1] |
| Apparent magnitude(V) | 15.5 |
| Characteristics | |
| Type | S pec (Ring) |
| Apparent size(V) | 0.3' x 0.3'[1] |
| Other designations | |
| VV 790b,2MASXJ05014205+0334278,PGC016572 | |
II Zwicky 28is aninteractingring galaxyat a distance of approximately 390 millionlight-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 theHubble Space Telescopehave 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 faintIRASsource, which may indicate a lower level of star formation than other rings, however it has a highHαluminosity, similar to other ring galaxies. It displays strongBalmer absorption linesinterior 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]
The bright foreground star is not associated to Zwicky; it is in our own galaxy, about 1,585 light-years away from the sun.
References
[edit]- ^abcd"Your NED Search Results".ned.ipac.caltech.edu.Retrieved2020-05-29.
- ^ab"NASA - Hubble Gazes on One Ring to Rule Them All".www.nasa.gov.Retrieved2020-05-29.
- ^"Collisional Ring Galaxies - P.N. Appleton & C. Struck-Marcell".ned.ipac.caltech.edu.Retrieved2020-05-29.
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