Arm Spiral
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what are the two major theories of spiral arm formations in our galaxy? the density wave theory is one?
Yes, density wave theory is one. But as far as I know, people haven't actually settled into a formal, agreed-upon theory.
One possible cause of spiral arms are density waves propagating through the stars and gas of the galaxy. This means that stars in an arm may not be in the arm after the density wave has moved on. What exactly causes these density waves is not known. Because of the increased density of gas in the arms, star formation in a spiral galaxy is concentrated in them, and so newer, bigger, and brighter stars tend to be in the arms.
Another current line of thinking is that galaxies that young galaxies with a relatively low total angular momentum form elliptical galaxies, and high angular momentum galaxies form spirals. Spirals probably start more like ellipticals, then collapse down to a disk (and a more spherical center bulge), and then the spiral arms form. Spirals all tend to be similar in mass, as opposed to the elliptical galaxies which vary in size from very small to the largest of galaxies. How these galaxies continue to develop is a topic for speculation, or you can ask me again in 5 or 10 billion years.
However, our pleasant little spiral galaxies tend to be far from dense galactic clusters. So, perhaps our Milky Way is a loner and doesn't want to play with the other kids.
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Backside continuous arm spirals
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