NGC 3783 | |
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Hubble Space Telescope image of NGC 3793 | |
Observation data (J2000 epoch) | |
Constellation | Centaurus |
Right ascension | 11h 39m 01.721s [1] |
Declination | –37° 44′ 18.60″ [1] |
Redshift | 0.008506 ± 0.000100 [2] |
Heliocentric radial velocity | +2,817 [3] km/s |
Distance | 135.7 Mly (41.60 [4] Mpc) |
Group or cluster | NGC 3783 group |
Apparent magnitude (V) | 13.43 |
Characteristics | |
Type | SBa [5] |
Apparent size (V) | 1′.9 × 1′.7 [5] |
Notable features | Seyfert 1 |
Other designations | |
MCG -06-26-004, PGC 36101 [6] |
NGC 3783 is a barred spiral galaxy located about 135 [4] million light years away in the constellation Centaurus. [7] It is inclined by an angle of 23° to the line of sight from the Earth along a position angle of about 163°. The morphological classification of SBa [5] indicates a bar structure across the center (B) and tightly-wound spiral arms (a). [8] Although not shown by this classification, observers note the galaxy has a luminous inner ring surrounding the bar structure. The bright compact nucleus is active and categorized as a Seyfert 1 type. This nucleus is a strong source of X-ray emission and undergoes variations in emission across the electromagnetic spectrum. [5]
The source of the activity in this galaxy is a rapidly rotating supermassive black hole, which is located at the core and is surrounded by an accretion disk of dust. [9] The estimated mass of this black hole, from reverberation mapping, is about 2.8 million times the mass of the Sun. [10] Interferometric observations yield an inner radius of 0.52 ± 0.16 ly (0.16 ± 0.05 pc) for the orbiting torus of dust. [11]
This is a member of a loose association of 47 galaxies known as the NGC 3783 group. Located at a mean distance of 117 million light-years (36 Mpc), the group is centered at coordinates α = 11h 37m 12s, δ = –37° 30′ 57.6″: equivalent to about 870×10 3 ly (267 kpc) from NGC 3783. The NGC 3783 group has a mean velocity of 2,903 ± 26 km/s with respect to the Sun and a velocity dispersion of 190 ± 24 km/s. The diffuse X-ray emission of the group is roughly centered on the galaxy NGC 3783. [12] The NGC 3783 group is located in the Hydra-Antlia region of the Hydra-Centurus Supercluster. [13] [14]
NGC 3783 | |
---|---|
![]()
Hubble Space Telescope image of NGC 3793 | |
Observation data (J2000 epoch) | |
Constellation | Centaurus |
Right ascension | 11h 39m 01.721s [1] |
Declination | –37° 44′ 18.60″ [1] |
Redshift | 0.008506 ± 0.000100 [2] |
Heliocentric radial velocity | +2,817 [3] km/s |
Distance | 135.7 Mly (41.60 [4] Mpc) |
Group or cluster | NGC 3783 group |
Apparent magnitude (V) | 13.43 |
Characteristics | |
Type | SBa [5] |
Apparent size (V) | 1′.9 × 1′.7 [5] |
Notable features | Seyfert 1 |
Other designations | |
MCG -06-26-004, PGC 36101 [6] |
NGC 3783 is a barred spiral galaxy located about 135 [4] million light years away in the constellation Centaurus. [7] It is inclined by an angle of 23° to the line of sight from the Earth along a position angle of about 163°. The morphological classification of SBa [5] indicates a bar structure across the center (B) and tightly-wound spiral arms (a). [8] Although not shown by this classification, observers note the galaxy has a luminous inner ring surrounding the bar structure. The bright compact nucleus is active and categorized as a Seyfert 1 type. This nucleus is a strong source of X-ray emission and undergoes variations in emission across the electromagnetic spectrum. [5]
The source of the activity in this galaxy is a rapidly rotating supermassive black hole, which is located at the core and is surrounded by an accretion disk of dust. [9] The estimated mass of this black hole, from reverberation mapping, is about 2.8 million times the mass of the Sun. [10] Interferometric observations yield an inner radius of 0.52 ± 0.16 ly (0.16 ± 0.05 pc) for the orbiting torus of dust. [11]
This is a member of a loose association of 47 galaxies known as the NGC 3783 group. Located at a mean distance of 117 million light-years (36 Mpc), the group is centered at coordinates α = 11h 37m 12s, δ = –37° 30′ 57.6″: equivalent to about 870×10 3 ly (267 kpc) from NGC 3783. The NGC 3783 group has a mean velocity of 2,903 ± 26 km/s with respect to the Sun and a velocity dispersion of 190 ± 24 km/s. The diffuse X-ray emission of the group is roughly centered on the galaxy NGC 3783. [12] The NGC 3783 group is located in the Hydra-Antlia region of the Hydra-Centurus Supercluster. [13] [14]