NGC 4698
| NGC 4698 | |
|---|---|
| 250px
NGC 4698 imaged with the 32-inch Schulman Telescope at Mount Lemmon Observatory
|
|
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 34m 20.310s[1] |
| Declination | +08° 11′ 51.94″[1] |
| Helio radial velocity | 1,002[2] km/s |
| Distance | 54.8 Mly (16.8 Mpc)[3] |
| Type | SA(s)ab[3] |
| Apparent dimensions (V) | 4′.0 × 2′.9[4] |
| Apparent magnitude (V) | 10.6[4] |
| Apparent magnitude (B) | 11.46[5] |
| Notable features | Seyfert-2 galaxy[3] |
| Other designations | |
| UGC 7970 | |
NGC 4698 is a barred spiral galaxy[5] located around 55[3] million light years away from Earth in the constellation of Virgo. It belongs to the Virgo Cluster of galaxies and is positioned near the northeastern edge of this assemblage.[4] The morphological classification of NGC 4698 in the De Vaucouleurs system is SA(s)ab,[3] which indicates a purely spiral structure with moderate to tightly wound arms.[6] It is inclined to the line of sight from the Earth by an angle of 53° along a position angle of 170°.[7]
A unique feature of this galaxy is that the stars and dust of the nuclear disk are rotating in a direction that is aligned perpendicularly to the galactic disk. The bulge likewise appears elongated out of the galactic plane. This unusual alignment may have been the result of a past merger event.[5]
NGC 4698 is classified as a Seyfert-2 galaxy with an active galactic nucleus, which displays a prominent emission of radio and X-ray energy from the core while showing narrow emission lines in the optical spectrum.[3] The unified model of Seyfert galaxies proposes that the nucleus of a Seyfert 2 galaxy is obscured by a thick torus of gas and dust. However, the varying X-ray emission of the core of NGC 4698 shows little indication of being obstructed, suggesting instead that the source of the energy emission is generally unobscured but anemic in nature.[8]
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lua error in package.lua at line 80: module 'strict' not found. Cite error: Invalid
<ref>tag; name "ApJ594_2_704" defined multiple times with different content - ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
