| NGC 3067 | |
|---|---|
 NGC 3067 | |
| Observation data (J2000.0 epoch) | |
| Constellation | Leo |
| Right ascension | 09h 58m [1] |
| Declination | +32° 22′ [1] |
 | This section needs expansion. You can help by adding missing information. (December 2025) |
NGC 3067 is an intermediate spiral galaxy in the constellation of Leo. [3]
Optical and 21-cm observations have been carried out on the small, low-luminosity Sb III galaxy NGC 3067. Outside its central region, the galaxy’s rotational speed gradually increases, reaching about 151 km/s at a distance of 7.3 kpc, which is close to the edge of the visible disk. The velocity gradient is approximately 5.2 km/s per kiloparsec. Absorption previously observed along the line of sight to the quasar 3C 232 appears near the minor axis of NGC 3067 at a projected distance nearly twice the galaxy’s radius. If this absorption comes from gas orbiting within the plane of NGC 3067, geometric analysis suggests that the galaxy’s rotation must continue increasing beyond the visible disk, reaching roughly 340 km/s at a radius of about 40 kpc. This would indicate that around 94% of the galaxy’s mass lies outside the optical disk and has a mass-to-luminosity ratio greater than 100. However, 21-cm observations from the Arecibo Observatory have not detected hydrogen clouds at that distance, instead placing an upper limit of about 10⁷ solar masses for any individual cloud. [4]
