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.[2][3] The galaxy has a mass of about (1.3±0.2)×107 M☉, around 100 million stars, and a diameter of around 3300 ly.[3][5] It is therefore quite faint, and so was only discovered in the 20th century.[2]
| UGC 9128 | |
|---|---|
 UGC 9128 | |
| Observation data (J2000 epoch) | |
| Constellation | Boötes |
| Right ascension | 14h 15m 56.70s[1] |
| Declination | 23° 03′ 16.2″[1] |
| Distance | 6.8–7.8 Mly (2.1–2.4 Mpc)[2][3] |
| Characteristics | |
| Type | dIrr[4] |
| Mass | (1.3±0.2)×107 [3] M☉ |
| Size | 3300 ly[5] |
| Other designations | |
| UGC 9128, DDO 187,[6] PGC 50961 | |
UGC 9128 is around 2.7 Mly from GR 8, which is its nearest neighbour.[6]
UGC 9128 is a starburst galaxy, with the peak of star formation being 20–100 million years ago.[3][6] It is thought to have both a halo and disc.[6]
References
edit- ^ a b 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.
- ^ a b c "Dwarf galaxy: small but perfectly formed". www.spacetelescope.org. Retrieved 8 August 2021.
- ^ a b c d e "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.
- ^ a b Plait, Phil (25 April 2011). "And the cottonball galaxies shall inherit the Universe". Slate Magazine. Retrieved 8 August 2021.
- ^ a b c d 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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