Chapter 14. Our Galaxy. All sky view of the Milky Way. Questions. How many stars are in the Milky Way? About 200 billion How many galaxies are there? About 40 billion (approximately). Questions. How old is the Milky Way Galaxy?
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X-ray emission from a supernova remnant Cassiopeia A. (Chandra X-ray Observatory)
New stars forming
v = R
The curve declines with radius because the mass is concentrated at the center (the Sun)
The Milky Way’s Rotation Curve is flat, indicating that the Milky Way’s mass is not concentrated in the center bulge
This implies the existence of “Dark Matter”
Red blobs are ionization (emission) nebulae
In visible light, dusty gas obscures the galactic center.
Radio image of Sgr A* shows bright filaments that trace out magnetic field lines around a central black hole
Radio image of galactic center shows ionized gas swirling around Sgr A*
Globular Clusters evenly distributed
Sun at center
Globular Clusters unevenly distributed
00 : 42.7 (h:m)
+41 : 16 (deg:m)
178x63 (arc min)