[HN Gopher] Black-hole-triggered star formation in the dwarf gal...
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Black-hole-triggered star formation in the dwarf galaxy Henize 2-10
Author : Brajeshwar
Score : 46 points
Date : 2022-02-14 17:26 UTC (5 hours ago)
(HTM) web link (www.nature.com)
(TXT) w3m dump (www.nature.com)
| miika wrote:
| What goes in must come out. 1st law of common sense LoL
| BiteCode_dev wrote:
| So... they recycle matters into stars?
|
| Can we say black holes are in fact... green?
| chrsig wrote:
| I mean, they are the best trash compactors known to us...
| tejtm wrote:
| previous thread https://news.ycombinator.com/item?id=30027502
| eminence32 wrote:
| > Black-hole-driven outflows ... probably play a role in heating
| and expelling gas (thereby suppressing star formation)
|
| I feel like there is a neat science-fiction story in here
| somewhere :) A hyper-advanced space civilization embarks on a
| multi-million-year mission to tow black holes into neighboring
| galaxies in order to suppress star formation there and thus
| reduce the chances of competing civilization appearing in the
| next few billion years
| cgriswald wrote:
| My first question would be why such a civilization isn't just
| colonizing that galaxy. If the reason is that those distances
| are too hard to cross, then my question is why they're
| concerned about other civilizations developing. Of the top of
| my head, the best reason they would be worried about it is
| because it is something they would do themselves; but ever for
| an advanced civilization that seems like an expensive project
| with limited return. Or maybe they're as fearful as Larry
| Niven's puppeteers.
|
| It also would be more efficient to go to that galaxy, tow its
| stars around, and form new black holes there. You'd move much
| less mass a much shorter distance. You could probably even pick
| a relative handful of stars and just nudge them and wait;
| they're already moving after all. Might as well use that
| momentum.
| echelon wrote:
| > My first question would be why such a civilization isn't
| just colonizing that galaxy.
|
| Super advanced AI civilization spreads in all directions.
| Eventually the loyalty and purpose bits flip and the far-
| flung frontiers no longer share the same mission profile or
| allegiances.
| withinboredom wrote:
| Maybe they can't colonize it due to multi-year gestation
| periods? Thus they can't grow the population fast enough.
| kadoban wrote:
| Maybe any civilization it can create there is bound to
| become a competitor for the same resources.
| eminence32 wrote:
| Ah, yes, creating black holes in-situ does sound more
| reasonable.
|
| As for the motivations of this civilization, I'm not sure, no
| one has written this story yet :)
| dmix wrote:
| A moat of black holes.
| nivekastoreth wrote:
| If your tech can do that, I wonder if it may be more efficient
| to just throw neutron stars around to disrupt star formation
| phendrenad2 wrote:
| So let me see if I'm understanding this, knowing nothing about
| cosmology other than what I've read on Wikipedia:
|
| Black holes pull in matter, but as the matter falls into the
| black hole, before it reaches the event horizon, it starts to
| collide into other matter, which can cause a lot of heating,
| which can cause gas jets to erupt outward. In the case of a
| supermassive black hole (such as the one theorized to be at the
| center of our galaxy), the gas jets could be so massive and hot
| that the gas could pull itself together (via gravity) and become
| one or more stars.
| nivekastoreth wrote:
| IANAS but:
|
| You were there up until the end. The gas jets aren't forming
| stars near the black hole nor are the stars formed using
| material from around it.
|
| Instead, they are sending out the equivalent of pilot lights
| that kick off star formation in another part of the galaxy
| where clouds of star forming gas were already collecting
| AnimalMuppet wrote:
| I believe the jets are _compressing_ the gas clouds that were
| already there. That definitely could trigger star formation.
| nivekastoreth wrote:
| Agreed. To go a little further: the main point of the paper
| is that there is a subtlety with how black hole outflow can
| effect the neighborhood:
|
| 1. the outflow is so energetic that it blows the gas clouds
| away and shuts down star formation
|
| 2. the outflow is energetic enough to compress/raise the
| temperature of the gas clouds, leading to star formation
|
| This second is the newly observed mode, but there is also
| yet more subtlety there since this burst of star formation
| may result a reduction in future star formations, but that
| is quickly approaching the limit of my layman/enthusiast
| understanding.
| radicaldreamer wrote:
| garbage collection
| h2odragon wrote:
| cookie recipe. _big_ batches.
| nivekastoreth wrote:
| The title here: > "Black Hole Gives Birth to New Stars Rather
| Than Devouring Them"
|
| is misleading. The black hole is still devouring matter, in fact
| it must have been to cause the outflow that triggered star
| formation in another region.
|
| Removing "Rather Than Devouring Them" would improve the title,
| but better would be to simply use the title from the paper.
| JALTU wrote:
| I was going to suggest, "Black Holes Provide Umbilical Cords to
| New Stars"
| nivekastoreth wrote:
| After I posted I was thinking and came up with "Black Hole
| Exhaust (Can) Breathe Life Into New Star Formation," but I
| also like yours
| labster wrote:
| Something about the way you wrote your headline makes me
| feel like it would be on a website with headlines like "Get
| six planets per orbit with this one weird trick" and "Which
| frequency pulsar is right for you?".
| hermitdev wrote:
| So, instead of "made of star dust", we're "made of black
| hole farts"?
| dang wrote:
| Ok, changed above. Thanks!
| klyrs wrote:
| Over-anthropomorphizing for self-amusement: perhaps it's merely
| playing with its food, creating new stars that it fully intends
| to devour in the future.
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