21Sep 2022 by Nigel Fleming No Comments
linkedin post 2021-03-18 04:05:56

linkedin post 2021-03-18 04:05:56

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BLACK HOLE FORMATION. “Any halo that grows faster than this rate will have its gravitational potential deepen faster than it can collapse, making it more likely to support strong radial inflows, conducive for SMS formation.” (SMSs = supermassive stars). https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments
linkedin post 2021-03-18 04:04:30

linkedin post 2021-03-18 04:04:30

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BLACK HOLE PREDICTIONS. “In general, for dynamical heating to suppress metal-free star formation, halo growth must be rapid from the H2-cooling limit to the atomic-cooling limit. More specifically, it must happen faster than a free-fall time (20 Myr).” https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-03-19 05:36:19

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EVERY GALAXY HAS ONE. “According to the current paradigm, galaxies are surrounded by extensive dark matter halos, and galaxies can grow in size when they come close enough to other galaxies for the dark matter to induce a merger. Many galaxies are also known to contain a supermassive black hole (SBH) at their center, and it is commonly assumed that SBHs are universally present in early-type galaxies and in the bulges of disk galaxies, at least for galaxies above a certain mass.” https://lnkd.in/dhkbfnG View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments
linkedin post 2021-03-19 05:34:08

linkedin post 2021-03-19 05:34:08

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THIS ENDS the extraordinary modeling paper on black hole formation in the prestigious journal Nature. It is a difficult and technical paper, but well worth the effort. Black holes are understood almost exclusively by indirect methods and models such as this one. By definition, they cannot be seen, except by their surrounding fiery halo, or the gravitational waves when two merge; but they remain one of the most impressive and enigmatic structures in the universe. https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments
linkedin post 2021-03-19 05:30:53

linkedin post 2021-03-19 05:30:53

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GRAVITATIONAL COLLAPSE. “We see that the infall speed always exceeds the effective sound speed at some enclosed mass, indicating that, at this scale, the thermal and turbulent support cannot support the gas against gravitational collapse.” https://www.nature.com/articles/s41586-019-0873-4 View in LinkedIn
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21Sep 2022 by Nigel Fleming No Comments

linkedin post 2021-03-21 05:51:50

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INBREEDING. “A final force that could drive incipient colonies away from a high degree of relatedness during evolution might be the loss of genetic fitness by inbreeding. In communal associations of bees, group members occupy a single nest. They cooperate in brood care, but without surrendering their personal reproduction. This form of sociality, which occurs in all six of the taxonomic families of bees, could lead to eusociality by the subordination of some of the nest occupants, although no such shift has yet been documented.” https://lnkd.in/drgWvGT View in LinkedIn
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