| UGC 9128 | |
|---|---|
 UGC 9128 | |
| Observation data (J2000 epoch) | |
| Constellation | Boötes |
| Right ascension | 14 15 56.70 |
| Declination | 23° 03′ 16.2″ |
| Distance | 6.8–7.8 Mly (2.1–2.4 Mpc) |
| Characteristics | |
| Type | dIrr |
| Mass | (1.3±0.2)×10 M☉ |
| Size | 3300 ly |
| Other designations | |
| UGC 9128, DDO 187, PGC 50961 | |
UGC 9128 is a dwarf irregular galaxy around 6.8–7.8 Mly (2.1–2.4 Mpc) away; it is thought to be in the Local Group, although its membership is not certain. The galaxy has a mass of about (1.3±0.2)×10 M☉, around 100 million stars, and a diameter of around 3300 ly. It is therefore quite faint, and so was only discovered in the 20th century.
UGC 9128 is around 2.7 Mly from GR 8, which is its nearest neighbour.
UGC 9128 is a starburst galaxy, with the peak of star formation being 20–100 million years ago. It is thought to have both a halo and disc.
References
- ^ Cotton, W. D.; Condon, J. J.; Arbizzani, E. (1999). "Arcsecond Positions of UGC Galaxies". The Astrophysical Journal Supplement Series. 125 (2): 409–412. Bibcode:1999ApJS..125..409C. doi:10.1086/313286. S2CID 122517686.
- ^ "Dwarf galaxy: small but perfectly formed". www.spacetelescope.org. Retrieved 8 August 2021.
- ^ "Dynamics of starbursting dwarf galaxies" (PDF). Retrieved 8 August 2021.
- McConnachie, Alan W. (2012-06-05). "The Observed Properties of Dwarf Galaxies in and Around the Local Group". The Astronomical Journal. 144 (1): 4. arXiv:1204.1562. Bibcode:2012AJ....144....4M. doi:10.1088/0004-6256/144/1/4. ISSN 0004-6256. S2CID 118515618.
- ^ Plait, Phil (25 April 2011). "And the cottonball galaxies shall inherit the Universe". Slate Magazine. Retrieved 8 August 2021.
- ^ Aparicio, Antonio; Tikhonov, Nikolay; Karachentsev, Igor (2000). "DDO 187: Do Dwarf Galaxies Have Extended, Old Halos?". The Astronomical Journal. 119 (1): 177–187. arXiv:astro-ph/9909493. Bibcode:2000AJ....119..177A. doi:10.1086/301157.
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