What are irregular shaped galaxies?
What are irregular shaped galaxies?
Irregular galaxies have no particular shape. They are among the smallest galaxies and are full of gas and dust. Having a lot of gas and dust means that these galaxies have a lot of star formation going on within them. They are two small galaxies which orbit around our own Milky Way Galaxy.
What do irregular galaxies contain?
In general, irregular galaxies contain large amounts of gas and dust, and can exhibit a significant degree of star formation activity. The closest galaxy to the Milky Way happens to be an irregular galaxy called the Canis Major Dwarf.
How do you classify irregular galaxy?
The shape of an irregular galaxy does not fall into any of the regular classes of the Hubble sequence. While not classified in the Hubble Classification System, irregular galaxies are classified into three categories: Irr-I (Irregular one), Irr-II (Irregular two) and dIrr (dwarf irregular).
How irregular galaxies are formed?
Irregular galaxies often form when one galaxy collides with another. Here, a smaller galaxy passed through the middle of a large spiral galaxy, forming this irregular Cartwheel Galaxy.
How many irregular galaxies are there?
Four irregular galaxies, as observed by the Hubble Space Telescope. Hubble recognized these two types of irregular galaxies, Irr I and Irr II.
Do irregular galaxies have gravity?
An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Some irregular galaxies were once spiral or elliptical galaxies but were deformed by an uneven external gravitational force. Irregular galaxies may contain abundant amounts of gas and dust.
Do irregular galaxies have a halo?
They have a bulge and halo, like spiral galaxies, but don’t have the flat disk of stars. The stars in ellipticals tend to be older. Irregular galaxies have no identifiable shape or structure to them. They are often chaotic in appearance, without a bulge or any trace of spiral arms.
Do irregular galaxies have black holes?
Many irregulars do not have supermassive black holes in their centers. These are typically the smallest irregular galaxies, like I Zwicky 18. Instead of black holes, many have “nuclear star clusters”, which are dense knots of many thousands of stars.
Do irregular galaxies have spiral arms?
Irregular galaxies have no identifiable shape or structure to them. They are often chaotic in appearance, without a bulge or any trace of spiral arms. The different shapes and orientation of galaxies are a result of their history, which may have included interactions with other galaxies.
How many stars are in an irregular galaxy?
It contains at least one billion stars, and large quantities of dust and gas leading to the current wave of intense star formation.
Do irregular galaxies have a disk?
Irregular galaxies have a disk, but no spiral arms. However, these galaxies do have a mixture of old and young stars combined with a large amount of gas and dust.
Do irregular galaxies rotate?
Looking at observations of galaxies leads to most of them, spinning with the arms trailing, but there are cases where the arms are facing the direction of the spin! So Yes, we have observed the spin of galaxies, no, not every galaxy rotates, irregular galaxies have no central point of mass of which to rotate about.
What are facts about irregular galaxies?
Some irregular galaxies were once spiral or elliptical galaxies but were deformed by an uneven external gravitational force. Irregular galaxies may contain abundant amounts of gas and dust. This is not necessarily true for dwarf irregulars. Irregular galaxies are commonly small, about one tenth the mass of the Milky Way galaxy.
What are the names of irregular galaxies?
An Irr-I galaxy ( Irr I) is an irregular galaxy that features some structure but not enough to place it cleanly into the Hubble sequence.
What are the characteristics of an irregular galaxy?
An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence , and they are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure.
Is a peculiar galaxy a type of irregular galaxy?
Peculiar Galaxies are, like Irregulars , galaxies that are unusual in their shape, size or composition. They are the result of the interactions between two galaxies, either gravitational or tidal forces from afar, or through collisions and mergers.
