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Local Superbubble in the News, XMM-Newton
SigurRosFan
post Apr 6 2006, 04:10 PM
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- http://www.ras.org.uk/index.php?option=com...id=984&Itemid=2

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The Local Hot Bubble
The Local Hot Bubble is a cool, old supernova remnant that envelopes the solar system and much more besides. It is not spherical, more like the shape of a bent hourglass or a peanut shell. The edge of the bubble is at least 91 light years away in the Northern fields, rising to 358 light years in the Southern fields.

Loop 1 superbubble
The Loop 1 Superbubble is a big, young, hot supernova remnant that is located approximately 684 light years away from the Sun and is about 895 light years in diameter.
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Bob Shaw
post Apr 6 2006, 06:02 PM
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I've just had a b-a-a-a-a-d fit of the giggles thanks to this post, which my poor eye/brain co-ordination transmuted into 'Local SuperHERO in the News'. I just couldn't understand the post at all, and must have read it half a dozen times with ever-mounting frustration! Oh, dear, must go and lie down... ...or get out more.

Bob Shaw


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dvandorn
post Apr 7 2006, 05:08 PM
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Hmmm... could the old, cool bubble be the actual source of the AL-26 enrichment our solar nebula received?

Be interesting if that enrichment happened in the middle of solar system development.

-the other Doug


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edstrick
post Apr 8 2006, 09:45 AM
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The age of these structures is on the order of a few million to (I think) at most a few tens of millions of years, not Billions <thousand-millions>.
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Rob Pinnegar
post Apr 8 2006, 06:18 PM
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QUOTE (edstrick @ Apr 8 2006, 02:45 AM) *
The age of these structures is on the order of a few million to (I think) at most a few tens of millions of years, not Billions <thousand-millions>.

Yeah. Supernova remnants don't last billions of years (well, unless you count the neutron star). The Vela supernova remnant is something like 25,000 years old, and it is already pretty ragged looking.
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dvandorn
post Apr 8 2006, 06:59 PM
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Well, OK -- though the Vela remnant is a lot more obvious and detectable than the bubbles we're talking about. The local bubble that we're currently within is cold, almost completely undetectable unless you cancel out *all* radiant energies from other stars, etc., and the hotter bubble pushing in on it is almost as difficult to detect.

We're not talking about pretty, quite dense (relative to the local bubbles) and quite detectable supernova remnants, here. We're talking about almost completely invisible currents of remnant gas and dust. Where they interact, and where they sit nearby other stars, they are so tenuous that the starlight completely obliterates any detectability. That's a far cry from the Vela nebula, which still visibly shines in reflected starlight.

We're also talking about bubbles that are hundreds of light years in diameter. How long does it take for a supernova remnant to expand that far? Only 20 or 30 million years? Expanding debris shells from supernovae are only accelerated at the very beginning, recall, and are subject to decelaration due to the pull of the neutron star / black hole supernova remnants. They may start expanding at near-relativistic speeds, but they slow down as time goes on.

I guess I'd like to see some numerical analyses on these things before pronouncing them relatively recent newcomers to this neighborhood of the Milky Way.

-the other Doug


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SigurRosFan
post Apr 10 2006, 07:45 AM
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- http://arxiv.org/abs/astro-ph/0604162 (The History and Future of the Local and Loop I Bubbles)

The Local Bubble is the result of 19 SNe (the last occurred about 500,000 years ago) occurring in a moving group and is 14.5 +0.7/-0.4 million years old.

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... predict the merging of the two bubbles in about 3 Myr ...
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SigurRosFan
post Apr 10 2006, 09:27 AM
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And about 39 Supernovae have occurred in L1 Superbubble until now and there are 38 Supernova candidates which are expected to explode within the next 13 million years.


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