Centaurus A is a radio galaxy that has a visible galaxy at the center. This central elliptical galaxy of Centaurus A is encircled by a ring of gas and dust, different from most elliptical galaxies. The dust ring orbits about an axis that is perpendicular to the axis of rotation of the elliptical galaxy. What does this suggest about this central elliptical galaxy of Centaurus A?
a. The radio jets have caused the dust disk to be driven around the elliptical galaxy.
b. There are at least two black holes at the center of the elliptical galaxy.
c. Centaurus A is probably the result of a merger of an elliptical galaxy and a spiral galaxy.
d. Dust is produced as the jets interact with the intergalactic medium.
e. Elliptical galaxies often contain dust that forms a disk along their rotation axis.
Question 2
Mass is transferred from a normal star in a close binary system toward a white dwarf. The material that is transferred to the white dwarf forms a rapidly growing whirlpool of material known around the white dwarf known as a(n)
a. accretion disk.
b. Lagrangian point.
c. Algol paradox.
d. planetary nebula.
e. supernova remnant.
A laser-guided observation of the Milky Way Galaxy at the Paranal Observatory in Chile in 2010.
Location of Alpha Centauri in Centaurus
Pap smear. Cells of the cervix (shown in the center) change in appearance as they progress through
Elliptical Galaxy M32
The Kaaba, center of the Haram Mosque, Mecca, Saudi Arabia.