Chapter 22 Neutron Stars and Black Holes
... However, a neutron-star binary system has been observed (two neutron stars); the orbits of the stars are slowing at just the rate predicted if gravity waves are carrying off the lost energy. ...
... However, a neutron-star binary system has been observed (two neutron stars); the orbits of the stars are slowing at just the rate predicted if gravity waves are carrying off the lost energy. ...
Black Holes
... • Light is made up of massless particles (even massless particles can’t escape) • It is called “black” because it absorbs all the light that hits it, reflecting nothing. ...
... • Light is made up of massless particles (even massless particles can’t escape) • It is called “black” because it absorbs all the light that hits it, reflecting nothing. ...
Powerpoint for today
... If core with about 3 MSun or more collapses, not even neutron pressure can stop it (total mass of star about 25 MSun). Core collapses to a point, a "singularity". Gravity is so strong that nothing can escape, not even light => black hole. Schwarzschild radius for Earth is 1 cm. For a 3 MSun object, ...
... If core with about 3 MSun or more collapses, not even neutron pressure can stop it (total mass of star about 25 MSun). Core collapses to a point, a "singularity". Gravity is so strong that nothing can escape, not even light => black hole. Schwarzschild radius for Earth is 1 cm. For a 3 MSun object, ...
File
... trajectory) would appear to them to move faster than the speed of light, and vice versa. The Schwarzschild surface appears to split into two in a region around us. We seem to lie inside a bubble formed by the two surfaces. Looking outward, we see the Schwarzschild surface (white grid lines) we just ...
... trajectory) would appear to them to move faster than the speed of light, and vice versa. The Schwarzschild surface appears to split into two in a region around us. We seem to lie inside a bubble formed by the two surfaces. Looking outward, we see the Schwarzschild surface (white grid lines) we just ...
Astronomy 15 - Problem Set Number 7
... which is numerically equal to Rs = (2.95 km) × mass in solar masses Thus the sun’s Schwarzschild radius would be about 3 km, while a 10-solar mass object has about a 30 km Schwarzschild radius. If you compress an object of mass M to a radius smaller than this, it will be a black hole; nothing can es ...
... which is numerically equal to Rs = (2.95 km) × mass in solar masses Thus the sun’s Schwarzschild radius would be about 3 km, while a 10-solar mass object has about a 30 km Schwarzschild radius. If you compress an object of mass M to a radius smaller than this, it will be a black hole; nothing can es ...
frame dragging effects
... where r and J are naturally defined from the above equations. With the adopted notation, Einstein field equations to lowest order look like Maxwell classical electrodynamics. To understand what plays the role of electric charge, it is enough to write the equations for the free fall ...
... where r and J are naturally defined from the above equations. With the adopted notation, Einstein field equations to lowest order look like Maxwell classical electrodynamics. To understand what plays the role of electric charge, it is enough to write the equations for the free fall ...
Hierarchical galaxy formation
... Strength of gravity depends on: •Mass of object •Distance from centre of mass If enough mass is concentrated into a small enough volume its gravity will be so strong that even light will not be able to escape. ...
... Strength of gravity depends on: •Mass of object •Distance from centre of mass If enough mass is concentrated into a small enough volume its gravity will be so strong that even light will not be able to escape. ...
The Evolution of the Universe and the formation of Black Holes
... place when all forms of energy and mass in a certain part of the universe gather at the same place, in a so-called black hole, which due to strong gravitational attraction absorbs everything in its surroundings, be it stars, planets or other space objects. The consequence of this is the highest poss ...
... place when all forms of energy and mass in a certain part of the universe gather at the same place, in a so-called black hole, which due to strong gravitational attraction absorbs everything in its surroundings, be it stars, planets or other space objects. The consequence of this is the highest poss ...
Introducing the black hole
... later phases of collapse never escape; they are caught up in the collapse of the geometry itself. That a sufficient mass of cold matter will necessarily collapse to a black hole (J. [Robert] Oppenheimer and [Hartland] Snyder1) is one of the most spectacular of all the predictions of Einstein’s stand ...
... later phases of collapse never escape; they are caught up in the collapse of the geometry itself. That a sufficient mass of cold matter will necessarily collapse to a black hole (J. [Robert] Oppenheimer and [Hartland] Snyder1) is one of the most spectacular of all the predictions of Einstein’s stand ...
AST301.Ch22.NeutGammBH - University of Texas Astronomy
... By now we have seen ~10 afterglows from gamma ray bursts (and their parent galaxies) and they are all extremely distant extremely luminous. In fact more energy produced than a supernova, and all in a matter of seconds! Probably most powerful objects in the universe. What are they?? A hint is that ...
... By now we have seen ~10 afterglows from gamma ray bursts (and their parent galaxies) and they are all extremely distant extremely luminous. In fact more energy produced than a supernova, and all in a matter of seconds! Probably most powerful objects in the universe. What are they?? A hint is that ...
take home quiz
... To detect black holes, astronomers look for _____. (Check only one answer) ultraviolet radiation they emit objects falling out of space-time nuclear reactions at their centers stars circling massive compact objects ...
... To detect black holes, astronomers look for _____. (Check only one answer) ultraviolet radiation they emit objects falling out of space-time nuclear reactions at their centers stars circling massive compact objects ...
Goal: To understand gravity
... • In fact it is harder to run into a black hole because it is so frikkn small (diameter of 3 km for one the mass of out sun). ...
... • In fact it is harder to run into a black hole because it is so frikkn small (diameter of 3 km for one the mass of out sun). ...
Slide 1
... From a solution from the Schwarzchild solution to Einstein’s Space-time field equations: This solution takes a mathematical form called a “metric” that describes the Geometry of space-time around a mass. One can derive the red shift of a photon escaping a mass starting at r1=R and at a distance r2 = ...
... From a solution from the Schwarzchild solution to Einstein’s Space-time field equations: This solution takes a mathematical form called a “metric” that describes the Geometry of space-time around a mass. One can derive the red shift of a photon escaping a mass starting at r1=R and at a distance r2 = ...
x + 1
... For problems 27 – 29, state whether the equation has one solution, no solutions, or if it is an Identity (Infinitely Many Solutions) 27. 4(x – 3) = 4x – 12 ...
... For problems 27 – 29, state whether the equation has one solution, no solutions, or if it is an Identity (Infinitely Many Solutions) 27. 4(x – 3) = 4x – 12 ...
ON GRAVITATIONAL COLLAPSE IN SPHERICAL SYMMETRY By
... singularity at r = 0, and that the two patches can be continuously ”glued” together at r = 2m using appropriate coordinate transformations [2, 3, 12, 18]. Photons or particles may travel from the r > 2m–region to the other patch, but the contrary is forbidden, since all their trajectories will end i ...
... singularity at r = 0, and that the two patches can be continuously ”glued” together at r = 2m using appropriate coordinate transformations [2, 3, 12, 18]. Photons or particles may travel from the r > 2m–region to the other patch, but the contrary is forbidden, since all their trajectories will end i ...
NASA`s X-ray Eye on the Universe
... times Sun’s mass • SMBH size ~ our solar system (15 lt mins) • SMBH grows as material falls in ...
... times Sun’s mass • SMBH size ~ our solar system (15 lt mins) • SMBH grows as material falls in ...
Cosmic Surveyor
... If one looks at this region with big telescopes and nearinfrared cameras one can see lots of stars. If one takes pictures every year it seems that some stars are moving very fast (up to 1500 kilometers per second). The fastest stars are in the very center - the position marked by the ...
... If one looks at this region with big telescopes and nearinfrared cameras one can see lots of stars. If one takes pictures every year it seems that some stars are moving very fast (up to 1500 kilometers per second). The fastest stars are in the very center - the position marked by the ...
