The Thick Disk: Galactic Construction Project or Galactic Rejects?

Posted by StarryGift On Mar 20, 2009

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Sunday, September 12, 2010

The Thick Disk: Galactic Construction Project or Galactic Rejects?

id="attachment_68847" class="wp-caption alignleft" style="width: 590px">href="http://www.universetoday.com/wp-content/uploads/2010/07/Our-Milky-Way-Gets-a-Makeover.jpg">class="size-medium wp-image-68847" src="http://www.universetoday.com/wp-content/uploads/2010/07/Our-Milky-Way-Gets-a-Makeover-580x434.jpg" alt="Our Milky Way Gets a Makeover" width="580" height="434" />class="wp-caption-text">The disk of our Milky Way is composed of more than just one part.

The disk of href="http://www.universetoday.com/30217/spiral-galaxy/" class="alinks_links" title="" rel="external">spiral galaxies is comprised of two main components: The thin disk holds the majority of stars and gas and is the majority of what we see and picture when we think of spiral href="http://www.universetoday.com/30168/galaxies/" class="alinks_links" title="" rel="external">galaxies. However, hovering around that, is a thicker disk of stars that is much less populated. This thick disk is distinct from the thin disk in several regards: The stars there tend to be older, metal deficient, and href="http://www.universetoday.com/34665/orbit/" class="alinks_links" title="" rel="external">orbit the center of the href="http://www.universetoday.com/30168/galaxies/" class="alinks_links" title="" rel="external">galaxy more slowly.

But where this population of the stars came from has been a long standing mystery since its identification in the mid 1970's. One hypothesis is that it is the remainder of cannibalized href="http://www.universetoday.com/30598/dwarf-galaxies/" class="alinks_links" title="" rel="external">dwarf galaxies that have never settled into a more standard orbit. Others suggest that these stars have been flung from the thin disk through gravitational slingshots or href="http://www.universetoday.com/52416/supernovae/" class="alinks_links" title="" rel="external">supernovae. href="http://arxiv.org/PS_cache/arxiv/pdf/1009/1009.1616v1.pdf">A recent paper puts these hypothesis to the observational test. (...)
Read the rest of href="http://www.universetoday.com/73308/the-thick-disk-galactic-construction-project-or-galactic-rejects/">The Thick Disk: Galactic Construction Project or Galactic Rejects? (315 words)

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