Calculate the distance to a galaxy that is moving away at 1000 km.9s-1. Given the Hubble time as 16.9 Billion years.
Q: Calculate the age of the universe if the Hubble constant were 65 km/s/Mpc.
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A: Hubble's law states that the universe is expanding. This was observed when galaxies were seen…
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A: Given Hubble's constant , H = 22 km/s/ million light years. Distance of galaxy , d = 600 million…
Q: suppose a galaxy is What is the recessional velocity of this galaxy?
A: We have to evaluate the recessional velocity of the galaxy Speed of light = 3 x 108 m/s = 3 x 105…
Q: Describe a quasar.
A: Quasar is an extremely luminous active galactic nucleus. inside quasar there is a supermassive black…
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Q: What is the redshift z of a galaxy 193 Mpc away from us? Note: Assume a value of the Hubble…
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Q: Calculate the redshift associated with a galaxy with a recessional velocity of 0.916c.
A: The change in frequency when observer and source are in relative motion is called the Doppler…
Q: Calculate the age of the universe if the Hubble's constant was 60 km-s¹ Mly¹.
A: Our universe is constantly expanding, It was observed by Edwin Hubble when he saw the galaxies…
Q: Distance to Andromeda galaxy is around 2.538 Mly. Calculate its recessional velocity.
A: Our universe is constantly expanding, It was observed by Edwin Hubble when he saw the galaxies…
Q: Suppose the Hubble constant were not 22 but 12.1 km/s per million light-years. Then what would the…
A: Write the expression for the volume of the sphere. Write the expression for the mass. Here, ρ is…
Q: A galaxy cluster has a recessional velocity of 19,000 km/s. Using the best estimate for Hubble's…
A: To calculate the distance of the distant galaxies in megaparsecs (Mpc) Hubble’s law is used. If the…
Q: The redshift of a galaxy is observed to be 0.5. Calculate the recessional velocity of the galaxy.
A: When a light source moves away from the observer the wavelength will shift towards the red region of…
Q: If we find a galaxy that is moving away at 72,000 km/s, what does Hubble’s law tells us about the…
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Q: Suppose that we were to discover that all galaxies are actually twice as far away as we think. How…
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Q: What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…
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Q: Describe the differences between Seyfert 1 and Seyfert 2 galaxies.
A: the problem is based on the concept of astronomy. The problem mainly deals with types of galaxies…
Q: If the active core of a galaxy contains a black hole of 106 M, what will the orbital period be for…
A: The expression for the orbital period, T=2πrv =2πrGMr =2πr32GM
Q: Using a value for Hubble's constant of 71 km/s per Mpc, find the recession velocity of a galaxy at a…
A: All observed galaxies were found to be redshifted which meant they were moving away from the Earth.…
Q: Suppose that while analysing the optical spectrum of a galaxy, you observe the Hα absorption line to…
A: Given: The wavelength observed of the absorption line is, The rest wavelength of this line is, The…
Q: Recall that Hubbleʹs law is written v = H0d, where v is the recession velocity of a galaxy located a…
A: Data provided: H0 = 80 km/Mpc Distance (d) = 800 Mpc Required: Velocity of the galaxy (v)
Q: Assume that the number density of stars in the Milky Way is 0.14 pc-3. (e) There are 10" stars…
A: Given, Number density of star is, ρ = 0.14 pc-3 Total number of stars in galaxy, N=1011 Let d is the…
Q: What is the redshift z of a galaxy 156 Mpc away from us? Note: Assume a value of the Hubble…
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Q: 1. What is the total energy output of a radio galaxy in the local Universe (at z = 0.1) with a flux…
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Q: A galaxy's distance from us is measured to be 49 Mpc. Using the same value of the Hubble constant,…
A: Given:distance of the galaxy, d = 49 Mpcstandard value for hubble's constant is, H = 70…
Q: Calculate the Hubble time for a universe with a Hubble constant of sixty kilometers per second per…
A: Given:Hubble's constant, Ho = 60km/(s Mpc)Asked:Hubble's Time, tH = ?
Q: Use the redshift of 3.8 for 4C41.17, a powerful radio galaxy, to determine the distance of the…
A: (a) the speed of the galaxy is, vc=z+12-1z+12+1vc=3.8+12-13.8+12+1=0.917v=0.9173×105 km/s=2.75×105…
Q: Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature…
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Q: 13-5. The reason that massive neutrinos were considered as a candidate for solving the miss- ing…
A: 5) The density of photons and neutrinos is 500 photons/cm3. It is required to find the individual…
Q: If active core of a galaxy contains a black hole of 10^6 M, what will the orbital period be for…
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Q: What is the redshift z of a galaxy 186 Mpc away from us? Note: Assume a value of the Hubble…
A: Hubble's law, also known as Hubble- Lemaitre law states that the velocity of the galaxy, also called…
Q: What is the redshift z of a galaxy 172 Mpc away from us? Note: Assume a value of the Hubble…
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Q: Let's say that the number density of galaxies in the universe is, on average, 3 × 10–68 galaxies/m3.…
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Q: Calculate the critical density necessary for a closed universe for two extremes of the Hubble…
A: The critical density necessary for a closed universe for two extremes of the Hubble constant. given,…
Q: What would be the critical density of matter in the universe if the value of the Hubble constant…
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Q: Calculate the Hubble time for a universe with a Hubble constant of 60 km-s-1-Mpc-1.
A: Edwin Hubble observed that the galaxies were moving away from us. He calculated their recession…
Q: If astronomers were to find they have made a mistake and our solar system is actually 7.8 (rather…
A: Let m be defined as the mass of the sun, and M be defined as the mass of the galaxy. Since the sun…
Q: how far away is the galaxy
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Q: 13-4. The Sun is moving with speed 2.5 X 105 m/s in a circular orbit about the center of the Galaxy.…
A: Given data: speed of sun, v = 2.5 x 105 m/s To find: i) Time period…
Q: Which of the following best describe the reasons we have to infer that a supermassive blackhole…
A: Actually the blackhole is a very higher density object . According to the general theory of…
Q: The Hubble constant is (approximately) 70 kilometers per second per megaparsec. At approximately…
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Q: Assume that an average globular cluster is 25 pc in diameter. If you observe a galaxy that contains…
A: For the small angle, the approximation is, sin θ≅ tan θ ≅ θIf the angle θ is expressed in…
Q: A galaxy at redshift z has an infrared luminosity of LIR. What is the approximate star formation…
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Q: The HI intensity vs. velocity curve for a disk galaxy has a width W = 400 kms ¹. This galaxy has a…
A: width W=400 km s-1 Pitch angle θ=20o luminosity =7% mass to light =2.5
Q: The goal of the project is to find as many of the valuable images of galaxy collisions as possible…
A: Both sensitivity and specificity must be greater than 90%, i.e. both the terms must be optimized to…
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