Chandra: A Biography of S. Chandrasekhar
Chandra is an intimate portrait of a highly private and brilliant man, Subrahmanyan Chandrasekhar, a Nobel laureate in physics who has been a major contributor to the theories of white dwarfs and black holes.
"Wali has given us a magnificent portrait of Chandra, full of life and color, with a deep understanding of the three cultures—Indian, British, and American—in which Chandra was successively immersed. . . . I wish I had the job of reviewing this book for the New York Times rather than for Physics Today. If the book is only read by physicists, then Wali's devoted labors were in vain."—Freeman Dyson, Physics Today
"An enthralling human document."—William McCrea, Times Higher Education Supplement
"A dramatic, exuberant biography of one of the century's great scientists."—Publishers Weekly
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astrophysicist whose major contributions were recognized very belatedly with the award of a recent Nobel Prize in physics. His style of work has been unusual in that he has concentrated on deep study ... Read full review
Blackholes ejecting super velocity stars along with planets after swallowing the star partner
New mechanism of absorption and ejection by blackholes as dual force operative breaking the old rules forming Neil Bohr-Pauli Exclusion dynamics
When matter falls into these behemoths, some material also is accelerated away, usually in two straight beams that fly out along the black hole’s spin axis. As matter falls into the black hole, the matter’s magnetic field gets twisted and amplified by the black hole’s spin, and this pumped-up magnetic field launches material outward in the form of jets.
"The most commonly accepted mechanism for doing so involves interacting with the supermassive black hole at the galactic core. That means when you trace the star back to its birthplace, it comes from the center of our galaxy. None of these hypervelocity stars come from the center, which implies that there is an unexpected new class of hypervelocity star, one with a different ejection mechanism."
Astrophysicists calculate that a star must get a million-plus mile-per-hour kick relative to the motion of the galaxy to reach escape velocity. They also estimate that the Milky Way's central black hole has a mass equivalent to four million suns, large enough to produce a gravitational force strong enough to accelerate stars to hyper velocities. The typical scenario involves a binary pair of stars that get caught in the black hole's grip. As one of the stars spirals in toward the black hole, its companion is flung outward at a tremendous velocity. So far, 18 giant blue hypervelocity stars have been found that could have been produced by such a mechanism.
For the origin of hypervelocity bodies, Ginsburg and his colleagues point to the close interaction of a binary star system -- two stars orbiting a common center -- with a massive black hole. The likely scenario is the black hole draws one of the pair into its gravitational well while simultaneously ejecting the other at 1.5 million miles per hour. More than 20 of these hypervelocity stars have been identified in the Milky Way.
Munching Binaries: One is Captured, One Speeds Away
"The hypervelocity stars we see come from binary stars that stray close to the galaxy's massive black hole," he says. "The hole peels off one binary partner, while the other partner -- the hypervelocity star -- gets flung out in a gravitational slingshot."
"We put the numbers together for observed hypervelocity stars and other evidence, and found that the rate of binary encounters [with our galaxy's supermassive black hole] would mean most of the mass of the galaxy's black hole came from binary stars," Bromley says. "We estimated these interactions for supermassive black holes in other galaxies and found that they too can grow to billions of solar masses in this way."
As many as half of all stars are in binary pairs, so they are plentiful in the Milky Way and other galaxies, he adds. But the study assumed conservatively that only 10 percent of stars exist in binary pairs.
Hypercompact stellar systems result when a supermassive black hole is violently ejected from a galaxy, following a merger with another supermassive black hole. The evicted black hole rips stars from the galaxy as it is thrown out. The stars closest to the black hole move in tandem with the massive object and become a permanent record of the velocity at which the kick occurred.
An analogy of nucleus absorbing electron -proton forming neutron and ejecting electron could be derived out of Neil Bohr dynamics
Unlike in General Relativity, the solutions may have a negative ADM mass. Such solutions have repulsive gravitational interaction at large distances. At short distances the repulsion may change to attraction and give rise to the horizon, hiding the singularity at the origin. Such solutions represent anti-gravitating black holes. In the case of a positive ADM mass, the S-dependent contributions may make the gravitational attraction weaker at short distances (cf. fig
Tracking the Legend of Chandrasekhar
The Simple and True
Choosing the Unconventional A Family Trait
Determined to Pursue Science Lahore and Madras 19101930
Discoveries Personal and Scientific Cambridge and Copenhagen 19301933
Fellow of Trinity College Cambridge 19331934
The Absurd Behavior of Stars Eddington and the White Dwarfs Cambridge 19341935
I Must Push On in My Directions Cambridge and Harvard 19351936
Scientist in the Midst of Political Turmoil Williams Bay Wisconsin 19371952
The Autocrat of the Editors Desk The Astrophysical Journal Chicago 19521971
In the Lonely Byways of Science Chicago 19721989
Conversations with Chandra
Lalitha Madras 1936