Press "Enter" to skip to content

What kind of stars are in the Milky Way?

The Milky Way may contain ten billion white dwarfs, a billion neutron stars, and a hundred million stellar black holes. Filling the space between the stars is a disk of gas and dust called the interstellar medium.

What is galactic structure?

This structure can be viewed as consisting of six separate parts: (1) a nucleus, (2) a central bulge, (3) a disk (both a thin and a thick disk), (4) spiral arms, (5) a spherical component, and (6) a massive halo. Some of these components blend into each other. three views of the Milky Way Galaxy.

Does the Milky Way have an active galactic nucleus?

An active galactic nucleus (AGN for short) is a small region at the center of a galaxy that is much brighter than it would be in an average galaxy. Our Milky Way galaxy has one of these supermassive black holes at its center, but our galaxy is not an active one.

What is the nucleus of the Milky Way galaxy?

The very center of our galaxy is called the nucleus, or central bulge. By observing X-ray emissions, radio maps, and infrared, we have seen that the center of the galaxy contains a lot of stars. But it also contains Sagittarius A*, or Sgr A*. A very powerful radio source lying in the galactic nucleus.

What are the 4 components of a galaxy?

From Earth, the Milky Way seems to be a heavenly mist because the stars blur together. Little do most people know, the stars are broken into four main parts. The four main parts are the disk, the nuclear bulge, the halo, and the galactic corona.

What is a double nucleus galaxy?

The double nucleus is actually an elliptical ring of old reddish stars in orbit around the black hole but more distant than the blue stars. Credit: NASA, ESA, and T. Lauer (National Optical Astronomy Observatory) This is the sharpest visible-light image ever made of the nucleus of an external galaxy.

Why do some cells have two nuclei?

Having two nuclei is like having two sets of blueprints, so the cells can build two proteins at the same time. Skeletal muscle is composed of long, fiber-like cells, which fuse together as they’re made. This means that each muscle cell has more than one nucleus because it is really made of several combined cells.

What do we think powers an active galactic nucleus?

Active galactic nuclei are the most powerful, long-lived objects in the Universe. Recent data confirm the theoretical idea that the power source is accretion into a massive black hole. Active galactic nuclei (AGN) involve the most powerful, steady sources of luminosity in the Universe.

Is the Milky Way a Seyfert galaxy?

Our galaxy isn’t generally considered a Seyfert galaxy, or a particularly active galaxy at all. But the Milky Way is known to have a 4-million-solar-mass black hole at its heart, called Sagittarius A*, or Sgr A* (pronounced Sagittarius A-star).

Are Seyfert galaxies active?

(The nucleus itself has neither emission lines nor absorption lines in its spectrum). Seyfert galaxies are a type of active galaxy; they are spiral galaxies with extremely bright nuclei. The luminosity of Seyfert galaxies ranges from 0.1 to 10 times the luminosity of our galaxy.

How common are Seyfert galaxies?

About 1 percent of all spiral galaxies are thought to exhibit Seyfert properties, or perhaps all spiral galaxies are Seyferts 1 percent of the time. The small spiral galaxy NGC 7742, a Type 2 Seyfert galaxy, as seen by the Hubble Space Telescope.