Kirt, Many thanks!!! Your information (although some of it is beyond my understanding at this point) is most interesting and adds a great deal to my understanding. Thanks again, Ed L --- Canopus56 <canopus56@yahoo.com> wrote:
--- Edward Lunt <lunco@yahoo.com> wrote:
In IC 410 there are a couple of gas formations known as the "tadpoles". Are these other examples of vertical chimneys?
I don't know that much about IC 410. It's the smaller nebulosity about a degree west of IC 405, the Flaming Star nebula (C31). The "tadpoles" in IC 410 are easily seen in this SEDs image -
http://www.seds.org/~spider/ngc/ngcdss.cgi?obj=IC!410&r=5:22.6&d=+33:31&e=J2...
These appear to be small globular clouds near a bright star or PN remnant. The solar wind from the bright star or PN remanent is blowing on the molecular clouds and form the characteristic "cometary knot" shape.
IC405 and 410 are part of the Orion cloud complex and are about 1,500 l/yr (500 parsecs) away. Similar blown molecular globule clouds can be seen inside this famous 1994 Hubble photo of the Helix Nebula:
http://hubblesite.org/newscenter/newsdesk/archive/releases/1996/13/
This small cloud group (IC 405 and 410) is local phenomena involving few light years (< 1 parsec) of volume.
Vertical chimneys or galactic fountains are on an entirely different scale. The whole Orion cloud complex sits on the edge of and is a small part of band of molecular clouds that define the boundaries of our 500 x 300 parsec Local Bubble. Sol is slighty off-center of this relatively gas free area.
BTW-Would you mind if I used your write-up as part of my permanent image album? I would certainly appreciate it.
Please do. I'm just resummarizing other secondary sources.
Enjoy - Canopus56(Kurt)
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