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The characteristics and the classification of the irregular galaxies

The characteristics and the classification of the irregular galaxies

Spiral galaxy M100 Spiral galaxies have three main components: This feature mostly contains older stars. The disk is made up of dust, gas, and younger stars.

The disk forms arm structures. Our Sun is located in an arm of our galaxy, the Milky Way.

  1. Dwarf Spheroidal galaxies exist at the faint end of the Dwarf Elliptical scale. Contain the oldest stars irregular galaxies no by 3 main characteristics.
  2. The halo of a galaxy is a loose, spherical structure located around the bulge and some of the disk. Irr I type galaxies have HII regions, which are regions of elemental hydrogen gas, and many Population I stars, which are young hot stars.
  3. Background information on galaxy classification irregular galaxies there is also a class hubble called s0 galaxies, which have characteristics of both. The classifications are a, b, c, d...
  4. Our Sun is located in an arm of our galaxy, the Milky Way.
  5. Contain the oldest stars irregular galaxies no by 3 main characteristics. Dwarf Spheroidal galaxies exist at the faint end of the Dwarf Elliptical scale.

The halo of a galaxy is a loose, spherical structure located around the bulge and some of the disk. The halo contains old clusters of stars, known as globular clusters.

  • They are elliptical in shape, contain very little or no gas, and have no evidence of recent star formation;
  • The disk is made up of dust, gas, and younger stars;
  • The four distinguishing characteristics of the spirals are:

Spiral galaxies are classified into two groups, ordinary and barred. In normal spirals as seen at above left the arms originate directly from the nucleus, or bulge, where in the barred spirals see right there is a bar of material that runs through the nucleus that the arms emerge from.

  1. They differ from ellipticals because they have a bulge and a thin disk, but are different from Sa because they have no spiral structure.
  2. In type "a", the arms are usually not well defined and form almost a circular pattern.
  3. They differ from ellipticals because they have a bulge and a thin disk, but are different from Sa because they have no spiral structure. Comparison of spiral, elliptical, and irregular galaxies teacher pdf 126kb as presented below student pdf astronomy basics graphic organizer.
  4. All this dust makes is almost impossible to see distinct stars in the galaxy. In normal spirals as seen at above left the arms originate directly from the nucleus, or bulge, where in the barred spirals see right there is a bar of material that runs through the nucleus that the arms emerge from.

Both of these types are given a classification according to how tightly their arms are wound. The classifications are a, b, c, d.

  • Introduction as the name suggests, irregular galaxies have no specific form, and so the group contains a very diverse selection of objects in fact, there are two types of irregular galaxy;
  • What are the three major types of galaxies and the characteristics of each main types of galaxies spiral elliptical properties of irregular galaxies do not.

In type "a", the arms are usually not well defined and form almost a circular pattern. Sometimes you will see the classification of a galaxy with two lower case letters. This means that the tightness of the spiral structure is halfway between those two letters.

They differ from ellipticals because they have a bulge and a thin disk, but are different from Sa because they have no spiral structure. S0 galaxies are also known as Lenticular galaxies. Irregular Galaxies Irregular galaxies have no regular or symmetrical structure.

Irr I type galaxies have HII regions, which are regions of elemental hydrogen gas, and many Population I stars, which are young hot stars. Irr II galaxies simply seem to have large amounts of dust that block most of the light from the stars. All this dust makes is almost impossible to see distinct stars in the galaxy.