Examples of HII Regions

1
Examples of HII Regions

• Note the characteristic red color from excited
  hydrogen
• Note the OB associations when visible
• Note the columns of dust that are aligned toward
  the OB association

2
California Nebula and the Pleiades
3
Cats Paw Nebula
4
The Cone Nebula
5
Emission Nebula in NGC3603
6
Emission Nebula in Carina (NGC 3372)
7
Emission Nebula in NGC 2264
8
Emission Nebula in NGC 281
9
Emission Nebula in NGC 6188
10
Emission Nebula in NGC 6599
11
HII Region in Ara
12
Horse Head Nebula in Orion
13
Close-up of Horse Head Nebula
14
Lagoon Nebula
15
The North America Nebula
16
The Omega Nebula
17
The Orion Nebula
18
The Rosette Nebula
19
The Keyhole Nebula
20
The Trifid Nebula
21
Emission Nebula in NGC 3603