Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session D5: Triumphs of 20th Century Astrophysics II: We Master the Stars |
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Sponsoring Units: FHP DAP Chair: Ramanath Cowsik, Washington University Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), Promenade C |
Saturday, April 12, 2008 1:30PM - 2:06PM |
D5.00001: How We Learned the Stars Run on Nuclear Energy Invited Speaker: |
Saturday, April 12, 2008 2:06PM - 2:42PM |
D5.00002: Galaxies, SMBHs, Magnetic AGNs, and Extra Galactic CR formation. Invited Speaker: The Brightest Matter, the Brightest Energy, the brightest quasi-star of the Universe (by very many orders of magnitude) is associated with the formation of the majority of the thin, flat rotation curve, spiral galaxies, each with a Super Massive Black Hole near their exact center. The transformation of the initial perturbation spectrum of the structure of the cooling baryonic fraction of the universe into a galaxy and finally into a SMBH is an awesomely complicated process. The further transformation of the free-energy of the formation of the SMBHs into magnetic fields, jets, Radio Lobes, and finally Extra Galactic Cosmic Rays, is even more complicated, each an irresistible physics challenge. A few such Examples: Initial structure perturbations have a small Reynolds number, $\sim $100. Computer simulations probably miss angular momentum transport in the collapse of proto galactic baryonic clouds to flat rotation curve galaxies. The seed BH at its center is probably preceded by a collapse mediated by pair neutrino emission, to a neutron star and a supernova. The unbinding of the supermassive star by the supernova is followed by fall-back and then by a black collapse until half the mass of the SMBH is accreted in a time of 1/20 the Eddington limit time. Only then can a Keplerian disk emerge. Event horizon physics dominates black collapse. The event horizon physics also dominates the $\alpha \omega $ dynamo that must precede the highly coherent helical magnetic jet formation. A coherent magnetic helix requires a large scale coherent dynamo. The dissipation of the current supporting the torsion-dominated helical magnetic fields probably occurs by current carrier starvation and resulting current carrier acceleration and momentum. The collimation and acceleration by magnetic fields occasionally leads to emission of $\sim $ 100 Mev gamma rays at $\sim $x100 the Eddington limit and probably CRs with E $>$ 10$^{30}$ ev. [Preview Abstract] |
Saturday, April 12, 2008 2:42PM - 3:18PM |
D5.00003: Standing on the shoulders of giants: Star and planet formation in 2010-2020 - The Kenneth Greisen Lecture Invited Speaker: Despite centuries of theoretical hypotheses on the origin of our own Sun and its planets, it is only in the past thirty years that we have begun to develop an empirical, observational picture of how stars and planets are forming today throughout our Galaxy and beyond. Driven largely by the advent of infrared and millimetre astronomy in the 1970s and 1980s, progress in the field has accelerated considerably in the past 10 years through the combination of powerful ground- and space-telescopes covering the X-ray, optical, infrared and millimetre, in addition to considerable improvements in theoretical simulations. In this talk, I shall present an overview of recent observational and theoretical work on the birth and early evolution of stars, brown dwarfs, circumstellar disks, jets, outflows, and planetary systems. In doing so, I shall also identify key problems which future facilities, including the next generation of extremely large ground-based telescopes and the NASA/ESA/CSA James Webb Space Telescope, will play vital roles in helping to unravel over the coming decade. [Preview Abstract] |
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