Sagittarius A (Sgr A)
Fr.: Sagittarius A
A strong radio source at the center of our Galaxy. It is a complex object with three components: Sgr A West is a thermal radio source made of several dust and gas clouds, which orbit → Sgr A* and fall onto it at velocities as high as 1000 km per second. Sgr A East is a → non-thermal source, about 25 → light-years across, that appears to be a → supernova remnant. Sgr A* is the most plausible candidate for the location of a Galactic → supermassive black hole with a mass of about 4 million → solar masses.
Fr.: bras du Sagittaire
One of the → spiral arms of the Milky Way Galaxy. It lies between the Sun and the the → Scutum-Crux arm. Also known as the Sagittarius-Carina Arm.
→ Sagittarius; → arm.