Week 11 notes
... • Highest temperature and lowest density of the three gaseous phases (hot, tenuous phase of the ISM): T ~ 103 to 106 K; n ~ 10-5 to 10-3 atoms/cm3 • Weak degree of concentration to the plane of the Galactic disk: scale height z is a few kpc. Also seen in dense knots known as “HII regions” marking ar ...
... • Highest temperature and lowest density of the three gaseous phases (hot, tenuous phase of the ISM): T ~ 103 to 106 K; n ~ 10-5 to 10-3 atoms/cm3 • Weak degree of concentration to the plane of the Galactic disk: scale height z is a few kpc. Also seen in dense knots known as “HII regions” marking ar ...
The Death of Massive Stars
... star leading to the emission of synchrotron radiation (nonthermal radiation). • The high spin rate of a neutron star is obtained from the original star’s spin as a result of angular momentum conservation. Ang • Neutron stars may undergo “glitches” in their Mom rotation rates. • Neutron stars may be ...
... star leading to the emission of synchrotron radiation (nonthermal radiation). • The high spin rate of a neutron star is obtained from the original star’s spin as a result of angular momentum conservation. Ang • Neutron stars may undergo “glitches” in their Mom rotation rates. • Neutron stars may be ...
Particle creation by black holes | SpringerLink
... tions in the early universe [9, 101. These small black holes, being at a higher temperature, would radiate more than they absorbed. They would therefore presumably decrease in mass. As they got smaller, they would get hotter and so would radiate faster. As the temperature rose, it would exceed the r ...
... tions in the early universe [9, 101. These small black holes, being at a higher temperature, would radiate more than they absorbed. They would therefore presumably decrease in mass. As they got smaller, they would get hotter and so would radiate faster. As the temperature rose, it would exceed the r ...
Chapter 1
... As expected the spatial period is exactly one wavelength () and the temporal period is exactly T s The wave travels in either the Cx or x directions, but which way for the form given here? Consider snapshots of y.x; t / at increasing time instants versus x and follow the movement of a wave cr ...
... As expected the spatial period is exactly one wavelength () and the temporal period is exactly T s The wave travels in either the Cx or x directions, but which way for the form given here? Consider snapshots of y.x; t / at increasing time instants versus x and follow the movement of a wave cr ...
Why is the darkness of the night sky evidence for the Big Bang?
... The solution actually has two parts, the black hole part in one universe where matter flows in and essentially a white hole part in another universe where matter flows out. ...
... The solution actually has two parts, the black hole part in one universe where matter flows in and essentially a white hole part in another universe where matter flows out. ...
grav1to11 (102 slides)
... • Infer additional/dark matter – E.g., Weakly Interacting Massive Particles • proton mass, but much less interactive • Suggested by Super-Symmetry, but undetected ...
... • Infer additional/dark matter – E.g., Weakly Interacting Massive Particles • proton mass, but much less interactive • Suggested by Super-Symmetry, but undetected ...
Electromagnetic Waves
... change speed, and go at different constant speeds); specifically, induction and energy conservation: • Recall (last chap): the strength of the induced fields depends on the rate of change of the field that created it. So, if light traveled slower, then its electric field would change slower, so woul ...
... change speed, and go at different constant speeds); specifically, induction and energy conservation: • Recall (last chap): the strength of the induced fields depends on the rate of change of the field that created it. So, if light traveled slower, then its electric field would change slower, so woul ...
CoRoT Observations of O Stars: Diverse Origins of Variability
... About 300 frequencies are required before the noise level is reached. Significance tests show that all 300 frequencies are significant. It is, however, highly suspicious that so many pulsation frequencies would be present in a single star. The time-frequency diagram (Fig. 1, right) clearly shows tha ...
... About 300 frequencies are required before the noise level is reached. Significance tests show that all 300 frequencies are significant. It is, however, highly suspicious that so many pulsation frequencies would be present in a single star. The time-frequency diagram (Fig. 1, right) clearly shows tha ...
The Pioneer riddle, the quantum vacuum and the acceleration of light
... has a completely negligible effect on the measurement. For instance, the difference and the sum of the radii of the Mars and Earth orbits are known since the radar ranging studies of the Viking missions with precisions of 100 m and 150 m, respectively [3]. If the same observations had been repeated ...
... has a completely negligible effect on the measurement. For instance, the difference and the sum of the radii of the Mars and Earth orbits are known since the radar ranging studies of the Viking missions with precisions of 100 m and 150 m, respectively [3]. If the same observations had been repeated ...
Fulltext PDF
... General relativity ushered in the era of modern cosmology. At very large scales, the universe around us appears to be spatially homogeneous and isotropic. This is the grandest realization of the Copernican principle: our universe has no preferred place nor favored direction. Using Einstein's equatio ...
... General relativity ushered in the era of modern cosmology. At very large scales, the universe around us appears to be spatially homogeneous and isotropic. This is the grandest realization of the Copernican principle: our universe has no preferred place nor favored direction. Using Einstein's equatio ...
Black Hole Spacetimes
... It represents a black hole that carries electric charge Q and has specific angular momentum a. Notice that this metric is no longer spherically symmetric, nor is it diagonal. More than ever, it is important to remember that these coordinates are nothing more than labels of events in spacetime. Excep ...
... It represents a black hole that carries electric charge Q and has specific angular momentum a. Notice that this metric is no longer spherically symmetric, nor is it diagonal. More than ever, it is important to remember that these coordinates are nothing more than labels of events in spacetime. Excep ...
B - AQA
... Figure 5 is on the line of centres between the Earth and the Moon At X the resultant gravitational field is zero, and the gravitational potential is –1.3 MJ kg–1. Calculate the minimum amount of energy that would be required to move a Moon probe of mass 1.2 × 104 kg from the surface of the Earth to ...
... Figure 5 is on the line of centres between the Earth and the Moon At X the resultant gravitational field is zero, and the gravitational potential is –1.3 MJ kg–1. Calculate the minimum amount of energy that would be required to move a Moon probe of mass 1.2 × 104 kg from the surface of the Earth to ...
Cooling of Compact Stars
... The Astrophysical Journal V 749 N1 Chris L. Fryer et al. 2012 ApJ 749 91 ...
... The Astrophysical Journal V 749 N1 Chris L. Fryer et al. 2012 ApJ 749 91 ...
Interstellar Astrophysics Summary notes: Part 5
... Since stars have masses of typically only a few solar masses, this implies that a large collapsing gas cloud must break up into smaller “parcels” of gas before star formation can begin – a process called fragmentation. It turns out that models of collapsing clouds, including the effects of rotation ...
... Since stars have masses of typically only a few solar masses, this implies that a large collapsing gas cloud must break up into smaller “parcels” of gas before star formation can begin – a process called fragmentation. It turns out that models of collapsing clouds, including the effects of rotation ...