For the Galactic Center black hole (Sag. A*), which has mass ~4.1 million solar masses, find the maximum luminosity that could be emitted via spherical accretion of ionized gas (i.e., the Eddington limit LEdd). Express your answer as a multiple of the Qlaxy's total luminous output, LMW = 2.5 x 1010 Lo (i.e., enter the ratio LEdd/LMw).
Q: suppose you collected a data set in which you measured fall-times for different fall-heights, you…
A:
Q: Problem 3: Two stars, M and N, from the same galaxy (at the same distance from earth) are observed…
A: The both stars emit same amount of energy per unit time. Luminosity is given as L=4πR2σT4, where R…
Q: The most mass of our Milky Way is contained in an inner region close to the core with radius Ro.…
A: Hello. Since your question has multiple sub-parts, we will solve the first three sub-parts for you.…
Q: The Schwarzschild radius of a black hole is the point at which the escape velocity equals that of…
A: Given, the Schwarzschild radius of a black hole is the point at which the escape velocity equals…
Q: Neutron stars, such as the one at the center of the Crab Nebula, have about the same mass as our sun…
A: Weight of the given person on earth is 685 N. Weight of a person on earth is given by the equation…
Q: Let m be the magnitude of a galaxy and μ be the magnitude per solid angle of the same galaxy. Show…
A: To prove the given relationship for the magnitude 𝑚 of a galaxy in terms of the magnitude per solid…
Q: An edge-on spectroscopic binary is monitored throughout its orbit. The spectroscopy indicates the…
A: In binary stars, both stars exert gravitational force on each other. Thus, they rotate around a…
Q: What is the rate of thermal radiation emitted from a star with a radius of 4.11 x 109 m and a…
A: A blackbody is considered as an ideal physical body which will absorb and emit all the radiations…
Q: you have light from the sun (540nm) that is hitting a solar sail (m= 10^3kg). To get it going at a…
A:
Q: Consider a spherical blackbody of constant temperature and mass M whose surface lies at radial…
A: As per General relativity gravity is capeable causing time dilation. Closer the clock is to the…
Q: The most mass of our Milky Way is contained in an inner region close to the core with radius Ro.…
A:
Q: What is the frequency fmax of the maximum (peak) in the blackbody distribution of a blackbody at…
A: Temperature, T=3000K
Q: Don't provide hand writing solution
A: The objective of the question is to sketch the Bode plots for the given transfer function H(w) = 10…
Q: Calculate the Doppler width of a spectrum line from a neon discharge tube operating at a temperature…
A: Given,The wavelength, Mass of the neon atom, The Boltzmann constant, Temperature,
Q: When two galaxies collide, the stars do not generally run into each other, but the gas clou do…
A: Given When two galaxies collide, the stars do not generally run into each other, but the gas clouds…
Q: In a fully degenerate gas, all the particles have energies lower than the Fermi energy. Using the…
A:
Q: n hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm. Find the speed…
A:
Q: The shock wave produced by the supernova expended from the center and is currently at the edge of…
A: Given: The supernova explosion created the shock wave, and the current location is at the edge of…
Q: 10. The absolute magnitude in the B band of the Sc galaxy M101 is MB = -21.51. « a) Using the…
A: Given information: The absolute magnitude in the B band of the Sc galaxy (MB) = -21.51 Now, from…
Q: When two galaxies collide, the stars do not generally run into eachother, but the gas clouds do…
A: Given When two galaxies collide, the stars do not generally run into each other, but the gas clouds…
Q: Consider a black body of surface area 20.0 cm² and temperature 5 000 K. what wavelength does it…
A: The peak wavelength of the radiation emitted by a blackbody is given by Wein's law. it states that…
Q: A cloud of gas has a temperature of 5,000 K. Estimate the width of the hydrogen H-alpha line with…
A:
Q: Can you please explain the math after (149709.34) 1/2 to get 386.92 how did you get that
A:
Q: Show work. For the following: A parsec is a distance equal to 3.26 light years. The speed of light…
A:
Q: Electron degeneracy pressure in a white dwarf star, of uniform density p, in the nonrela- tivistic…
A:
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
- a)Define the term “standard candle” as used in cosmology. b)The flux is defined asf(Dlum) = L/4πD^2lumwhere L is the absolute luminosity and Dlum is the distance to the radiation source (youmay assume z ≪ 1).Assume that we have measured the flux to be f = 7.234 10^−23 Wm^−2 and the absoluteluminosity is given by L = 3.828 x10^26W. Calculate the luminosity distance D lum to the objectin Mpc.The most mass of our Milky Way is contained in an inner region close to the core with radius Ro. Because the mass outside this inner region is almost constant, the density distribution can be written as following (assume a flat Milky Way with height zo): { r Ro Po, p(r) = 0, (a) Derive an expression for the mass M(r) enclosed within the radius r. (b) Derive the expected rotational velocity of the Milky Way v(r) at a radius r. (c) Astronomical observations indicate that the rotational velocity follows a different behaviour: Vobs (r) = VGT Po z0 Ro 5/2 1+e-4r/Ro 4 Draw the expected and observed rotational velocity into the plot below:Remember that photon (particle of light) has no mass, so according to energy- momentum relationship, E² = (mc²)² + (pc)², the photon energy (E) is related to its momentum (py) by E₁ = pyc. A particle of mass M initially at rest completely absorbs a photon, after which its mass is 1.02M. Hint a. What was the energy of the incoming photon? Give your answer in terms of M, c, and other numerical factors. Ex = b. What is the momentum that the resulting particle moves with? Give your answer in terms of M, c, and other numerical factors. Momentum of particle of mass 1.02M is
-  Q/ b) Vega Star of radius (1.6832) million km emit a) thermal radiation as a black body radiation at temperature of (18500 K). Calculate the Luminosity of this star. [o is Stefan-Boltzmann constant = 5.67 *x 10-5 erg cm-2 K-4 s-1]Of 1.5, 3, 5, and 10 give the maximum apparent speeds. 2. Consider a relativistic jet with an angle of 70 degrees relative to the line of sight (i.e. it is almost, but not quite perpendicular to the line of sight). Let its value of gamma for the motion be 3. (a) Will it appear superluminal? (b) Will it appear to be brighter or fainter than it would in its own rest frame? 3. State whether the following reactions are possible under special relativity. If not, explainApproximate values of length (in meters) 107 Diameter of Earth 1011 Distance from Earth to Sun 1016 Distance traveled by light in one year 1021 Diameter of the Milky Way Galaxy 1022 Distance from Earth to the nearest galaxy 1025 Distance from Earth to the edge of the known universe
- Use Wien's Law to calculate the peak wavelength of light coming from the Sun. Assume T=5800 K for the surface temperature of the Sun. Wein's displacement law says that the blackbody temperature and peak wavelength multiplied together give a constant of 0.29 cm-K. (K is degrees Kelvin). Convert the wavelength from part A into a frequency. The product of wavelength and frequency for electromagnetic radiation is a constant, the speed of light (c), 3 x 10^10 cm/s.Quasars, an abbreviation for quasi-stellar radio sources, are distant objects that look like stars through a telescope but that emit far more electromagnetic radiation than an entire normal galaxy of stars. An example is the bright object below and to the left of center in Fig; the other elongated objects in this image are normal galaxies. The leading model for the structure of a quasar is a galaxy with a supermassive black hole at its center. In this model, the radiation is emitted by interstellar gas and dust within the galaxy as this material falls toward the black hole. The radiation is thought to emanate from a region just a few light-years in diameter. (The diffuse glow surrounding the bright quasar shown in Fig. is thought to be this quasar’s host galaxy.) To investigate this model of quasars and to study other exotic astronomical objects, the Russian Space Agency has placed a radio telescope in a large orbit around the earth. When this telescope is 77,000 km from earth and the…Longs Van aw rejtoug] - consider a liquid mixture of components 1,2, 3, 4. The excess Gibbo energies of all the binaries, formed by these components obey relations of the formi Aijxjxj G₁₁ RT where Alj is the const characteristic of the i-j binary. Desire an expression for the co-efficient of component-I in the quaternary solution. وعاد سامانه . NL = enemical Engg Thermodyamies Question Torture TA gif croftrum svedo sit
- In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun that occupy less space than our moon. Suppose that one of these black holes has a mass of 1x10^3 suns and a radius equal to one-half the radius of our moon. What is the density of the black hole in g/cm^3? The radius of our sun is 7.0x10^5 km, and it has an average density of 1.4x10^3 kg/m^3. The diameter of the moon is 2.16x10^3 miles.You are the leader of the international Event Horizon Telescope, a collaboration of radio astronomers who want to take a picture of the black hole at the center of the Milky Way (Sag. A*). That black hole has a mass of about 4.1 million solar masses and is about 8 kpc away. If you are observing with a radio wavelength of about 1 mm, what effective diameter of your radio interferometric array is needed in order to just resolve the diameter of the Sag. A* black hole event horizon. (Assume the black hole is non-spinning, so its diameter is twice the event horizon radius.) Express your answer as a multiple of the Earth's radius. [Hint: you will need to recall and combine three formulas introduced throughout this course, including one about how big a black hole is, one about the criterion for resolving objects, and another that relates distance, sizes, and angles.] There really is an Event Horizon Telescope, and they are responsible for the first image of a black hole in the galaxy M87…If you have a positive look (pi+, mass: mpi = 2.50 x 10-28 kg) at rest and it decays to a positive muon (u+, mass: mu = 1.88 x 10-28 kg) and a neutrino. 1. How much gas is released during the decay process in MeV? If the rest mass of a neutrino is assumed to be negligible. 2. Why is the neutrino required for this decay to occur?