NGC 7507

NGC 7507 is an elliptical galaxy located in the constellation Sculptor. It was discovered by the German-British astronomer William Herschel on October 30, 1783. The galaxy lies at an estimated distance of from the Milky Way, and has an angular size of in the near infrared. It is receding with a heliocentric radial velocity of.
The morphological classification of NGC 7507 is E0, indicating an elliptical galaxy with an almost perfectly circular profile. This massive galaxy is fairly isolated, although it forms a pair with the barred spiral galaxy NGC 7513. The latter lies at a projected angular separation of. Apart from a central dust lane, NGC 7507 displays neither shells nor tidal features. The stellar halo has two components, with the outer and inner halos counter-rotating.
It is unusual galaxy in that it displays a negligible dark matter profile, showing a constant mass to light ratio. This apparent lack of a dark matter component is difficult to explain in an LCDM cosmology. The globular cluster population around NGC 7507 is very small, being only a tenth the size of other comparable ellipticals. It more closely resembles the globular population of a spiral galaxy.