NATS 1740 Lecture Notes - Lecture 25: Lenticular Galaxy, Spiral Galaxy, Barred Spiral Galaxy

• School: York University
• Department: Natural Science
• Course: NATS 1740
• Professor: Michael De Robertis, Alireza Rafiee

Document Summary

Hubble suggest the galaxy is 2 times bigger. Most evolutionary and precious image from the universe: hubble extreme deep field great variety of galaxies, some of them billions of light-years away. The age of galaxy and its distance are related closely. The study of galaxies is thus immediately connected with cosmology the study of the structure and evolution of the unverse: patterns among the properties of galaxies. Spiral galaxy, elliptical galaxy: because the shape is elliptical, irregular galaxies. + are often found in groups of galaxies (up to few dozen galaxies per group) + disk component: stars of all ages, many gas clouds. + spheroidal component: bulge and halo, old stars, few gas clouds. Barred spiral galaxy: has a bar of stars across the bulge. Lenticular galaxy: has a disk like a spiral galaxy but less dusty gas (intermediate between spiral and elliptical) + all spheroidal component, virtually no disk component.