Which of the following objects is considered to possibly contain a black hole? a. the central star of the Crab nebula b. the Orion nebula c. LMC X-3 d. Algol e. PSR 1257+12
Q: The temperature of the CMB today is T=2.725 K. Calculate the temperature of the CMB at redshift…
A: Given T = To = 2.725 K z = 2000 Temperature of CMB at redshift 'z' is given by T = To (1+z)
Q: GMm F r2 F,(r = R) The surface gravity g = of a body is. The acceleration due to gravity that an…
A:
Q: 2) What happens when one of the star ina binary system becomes a black hole.
A: Binary systems are two astronomical bodies that orbit each other around a common center of mass. If…
Q: 1.0 0.8 0.6 Cosmic background data from COBE 0.4 0.2 0.0l 0.5 10 Wavelength A in mm c) The left hand…
A: from the graph, the maximum intensity of radiation is at λ=1 mm. From Wein's law, we have…
Q: Two stars are in a closely orbiting binary system. The smaller star (a K-type main sequence star)…
A: The correct option. Following the mass transfer, which of the following is now true of the main…
Q: An AGN is emitting with a luminosity of 2×1040W. The AGN's brightness varies by 10% on a time scale…
A: GivenAn AGN is emitting with a luminosity of 2×1040W. The AGN's brightness varies by 10% on a time…
Q: A star is observed with a surface temperature of 3,000 K and a luminosity of 100,000 solar…
A: Given , Temperature = 3000 K Solar Luminosity = 100,000 Now , mass and luminosity are related by…
Q: A star is observed to have a parallax of 0.05". If we were to send a radio signal towards this star…
A:
Q: The H-alpha line from a star is observed to be 725 nm. Estimate its redshift.
A: As per De Broglie's hypothesis light can behave both as a wave and particle. Thus light waves can…
Q: If a 1.40 Msun neutron star has a radius of 10 km, what is the density (in kg/cm³) of a 1.52 Msun…
A: Consider the neutron star is in a perfect sphere. The expression to solve for the density of the…
Q: Astronomers think of pulsars not as pulsing objects, but rather like a(n) a. Cepheid variable.…
A: A Cepheid variable is a class of stars, that varies in its apparent magnitude values over a period…
Q: "Star Formation and Lifetimes" pg. 120, question 7 A star with twice the mass of the Sun would have…
A: In stars higher mass leads to higher compression. Which results higher Central density and…
Q: We know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would ...…
A: Dark Matter is an unknown matter which is not visible. The reason behind its invisibility is, it…
Q: ased on what you have learned about galaxy formation from a protogalactic cloud (and similarly star…
A: Dark matter do not emit any radiation The pressure of an ideal gas decreases when temperature drops…
Q: A Type la supernova explodes in a galaxy at a distance of 8.70 x 10' light-years from Earth. If…
A: Given value--- Hubble constant = 68.1 km/s/Mpc . distance of galaxy from Earth = 8.70 × 107 light…
Q: GM What is the orbital period of a bit of matter in an accretion disk that is located 3 x 105 km…
A: Time period was found to be 526 seconds So answer to fill in blank is 526. Detailed solution is…
Q: An AGN hosts a central Black Hole of mass 2×1038×1038 kg. The AGN emits at 1/51/5 of the Eddington…
A: To find the luminosity of the AGN, we can use the Eddington luminosity formula:L = η * (4 * π * G *…
Q: Which of the following observatories is most likely to discover a black hole in a binary system? A.…
A: A binary system is defined as a system in which two objects revolve around each other, having a…
Q: How close, r, to the center of a neutron star would a manned satellite be orbiting if it were at the…
A: Gravitational force of earth’s surface = Gravitational force of star GMN mr2=mg r= G MNg
Q: What is the peak wavelength (in nm) of a neutron star's luminosity if its temperature is 106 K?
A: As we know that Using weins displacement law,λmax T = b -----(1).where b is a constant. known as…
Q: 38 An AGN hosts a central Black Hole of mass 5×10 kg. The AGN emits at 1/6 of the Eddington limit.…
A: To find the luminosity of the AGN, we first need to calculate the Eddington luminosity (LEdd) and…
Q: How do black holes form?
A:
| a. |
the central star of the Crab nebula
|
|
| b. |
the Orion nebula
|
|
| c. |
LMC X-3
|
|
| d. |
Algol
|
|
| e. |
PSR 1257+12
|
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- What are the angular diameters of the following, as seen from Earth? a. The Sun, with radius R = Rsun = 7x10^5 km. b. Betelgeuse, with MV = -5.5 mag, mv = 0.8 mag, and R = 650Rsun. c. The galaxy M31, with R = 30 kpc at a distance D = 0.7Mpc. d. The Coma cluster of galaxies, with R = 3 Mpc at a distance D = 100 Mpc.When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum. Why does this redshift occur? A The star is at rest relative to Earth. The star is moving toward Earth at decreasing speed. The star is moving toward Earth at increasing speed. D The star is moving away from Earth. DOOO5
- Assume that the laws of Newtonian mechanics and Newtonian gravity still hold for a neutron star, what approximately is the escape velocity at the surface of a 1.4 solar mass neutron with a radius of 10 km? A. 2×108 m/s B. 108 m/s C. 1.5 ×108 m/s D. 2.5 ×108 m/sThe density of a ________________ is greater than the density of a _________________. a. white dwarf; neutron star b. neutron star; black hole c. pulsar; neutron star d. pulsar; white dwarf e. white dwarf; black holeWhen a mass is transferred through the inner Lagrangian point in a binary system toward a white dwarf, the material forms a rapidly growing whirlpool of material known as a(n) a. accretion disk. b. Lagrangian point. c. Algol paradox. d. planetary nebula. e. supernova remnant.
- Black holes are formed by A. collapsed dark nebulae. B. supernovae from binary stars. C. a lack of any light in a region of space. D. supernovae from the most massive stars.Consideration of the total energy in a radio lobe of an AGN implies that the energy is distributed evenly between the particles in the lobes and the magnetic field. This implies that the magnetic field scales with observed luminosity L as Select one: a. [417 O b. is independent of L ○ c. 11/11 O d. 12/7 ○ e. LThe supermassive black hole at the center of a galaxy has a mass of 6.5 billion solar masses. If we assume that it is a Schwarzschild black hole, what is the radius of this black hole? A. 18 light hours B. 20 light hours C. 16 light hours D. 14 light hours Is the answer A? S. radius = 3 x 6.5 x 109 x 9.26567-10 = 18.1 light hours Thanks!
- The speed of light in vacuum is 300,000 km/s. Suppose that the pulse rate of a pulsar is 0.001 s. Then its size cannot be bigger than about O A. 30,000 km. OB. 300,000 km. OC.3,000 km. O D. 300 km.F2 Which of the following can a black hole not "eat" or consume? #3 E another black hole a planet black holes can eat anything O a cloud of gas and dust O a star F3 $ 4 R F4 Q Search DII % 5 F5 T L ☀ < F6 6 Y ☀ F7 & 7 PrtScn U F82. The quasar that appears the brightest in our sky, 3C 273, is located at a distance of 2.4 billion lightyears.The Sun would have to be viewed from a distance of 1300 light-years to have the same apparentmagnitude as 3C 273. Using the inverse square law for light, estimate the luminosity of 3C 273 in solarunits.