1. Physics 231: Section 6 Galaxies http://mimas.physics.drexel.edu/phys231 1Phys 231, Topic 6: Galaxies

2. M104 – The “Sombrero” Galaxy Phys 231, Topic 6: Galaxies2 Sa Galaxy Very prominent bulge with tightly wound spiral arms

3. M81 Phys 231, Topic 6: Galaxies3 Sb galaxy. Extended bulge but with relatively prominent arms.

4. M74 Phys 231, Topic 6: Galaxies4 Sc galaxy Tight galactic bulge. Very extended, blue arms.

5. Phys 231, Topic 6: Galaxies5

6. 6

7. 7 Stellar mass function in galaxies. From Pannella et al. (2009) Red=“Early Type” Blue=“Late Type”

8. M102 Phys 231, Topic 6: Galaxies8 A “Lenticular” galaxy

9. M109 Phys 231, Topic 6: Galaxies9 SBc Barred Spiral

10. M59 Phys 231, Topic 6: Galaxies10 An E5 galaxy.

11. Sextans A Phys 231, Topic 6: Galaxies11 Irregular galaxy

12. Morphological Segregation Phys 231, Topic 6: Galaxies12 From Dominguez et al. (2000). Spirals and Irregulars (S+I) preferentially live in low density environments. Early types (Ellipticals and S0’s) live in high density environments.

13. Which one is another galaxy, and which one is part of the Milky Way? Phys 231, Topic 6: Galaxies13

14. The Globular Cluster M13 Phys 231, Topic 6: Galaxies14

15. Cepheid Variables Phys 231, Topic 6: Galaxies15

16. Phys 231, Topic 6: Galaxies16

17. Rotation Curve of NGC891 (in HI) Phys 231, Topic 6: Galaxies17

18. Herschel/Kapteyn Model of the Milky Way (with the sun near the center) Phys 231, Topic 6: Galaxies18

19. The Structure of the Milky Way Phys 231, Topic 6: Galaxies19

20. Phys 231, Topic 6: Galaxies20

21. Black Hole/Bulge Relation Phys 231, Topic 6: Galaxies21

22. Phys 231, Topic 6: Galaxies22

23. Coma Cluster (optical) Phys 231, Topic 6: Galaxies23

24. Coma Cluster (X-ray) Phys 231, Topic 6: Galaxies24

25. Hubble’s Original Measurement Phys 231, Topic 6: Galaxies25