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NGC 2775
Galaxy in the constellation Cancer
From Wikipedia, the free encyclopedia
NGC 2775, also known as Caldwell 48, is a spiral galaxy in the constellation Cancer. It is 67 million light-years (20.5 megaparsecs)[4] away from the Milky Way. It was discovered by German-British astronomer William Herschel on 19 December 1783.[9][10]
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| NGC 2775 | |
|---|---|
NGC 2775 imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Cancer |
| Right ascension | 09h 10m 20.112s[1] |
| Declination | +07° 02′ 16.53″[1] |
| Redshift | 0.004500±0.00000334[2] |
| Heliocentric radial velocity | 1,316.4±13.4 km/s[3] |
| Distance | 67 Mly (20.5 Mpc)[4] |
| Apparent magnitude (V) | 10.4[5] |
| Characteristics | |
| Type | SAa[6] or SA(r)ab[7] |
| Size | ~79,000 ly (24.23 kpc) (estimated)[2] |
| Apparent size (V) | 4.3′ × 3.3′[7] |
| Other designations | |
| IRAS 09076+0714, UGC 4820, MCG +01-24-005, PGC 25861, CGCG 034-006, C 48[8][2] | |
This object has a morphological classification of SA(r)ab,[7] which indicates an unbarred spiral galaxy (SA) with a prominent ring structure (r) and flocculent,[11] tightly wound spiral arms (ab).[12] The galaxy is inclined by an angle of 44° to the line of sight from the Earth.[7] The galactic nucleus is not active[3] and the large nuclear bulge, which extends out to an angular radius of 0.4′,[12] is relatively gas free.[11] An explanation for the latter could be a high supernova rate.[7] Although star formation is taking place in the dusty outer ring,[12] NGC 2775 does not display any current starburst activity,[13] and the galactic nucleus is virtually free of any star formation whatsoever.[11]
The galaxy's hydrogen tail feature indicates a past interaction with a faint companion.[7] A satellite galaxy appears to have orbited NGC 2775 multiple times, losing mass as it did so and creating faint, shell-like structures.[12] Nearby irregular galaxy NGC 2777 displays a tidal tail of hydrogen gas that points back to NGC 2775, suggesting the two may be linked.[14]
Cluster and group membership
NGC 2775 belongs to the Antlia-Hydra Cluster[15] of galaxies and is the most prominent member of the NGC 2775 Group (also known as LGG 169), a small galaxy group in the Virgo Super-cluster, along with the Local Group. Other members of the NGC 2775 Group include NGC 2777 and UGC 4781.[16][17]
Supernova
One supernova has been observed in NGC 2775. SN 1993Z (Type Ia, mag. 13.9) was discovered by the Leuschner Observatory Supernova Search (LOSS) on 23 September 1993.[18][19] By September 25, spectral analysis showed that it had peaked about four weeks earlier.[18]
Gallery
NGC 2775 imaged with a 32-inch telescope.
Map showing the location of NGC 2775.
NGC 2775 (SDSS DR14)
NGC 2775 from the Hubble Space Telescope
