Because of interstellar dust, astronomers can see at most about 5 kpc into the disk of the galaxy at visual wavelengths. What percentage of the galactic disk does that include? (Hint: Consider the area of the entire disk versus the area visible from Earth.)
Q: A globular cluster is located 4.57 kpc interior to the Sun's orbit and 7.93 kpc below the disk of…
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Q: Using 22 km/s/million light-years for Hubble’s constant, what recessional velocity do we expect to…
A: Given Hubble's constant , H = 22 km/s/ million light years. Distance of galaxy , d = 600 million…
Q: The hydrogen Balmer line has a wavelength of 486.1 nm. It is shifted to 552 nm in a galaxy's…
A: The red shift of hydrogen is, 1+z=λ2λ1z=552486.1-1 =0.1356
Q: If a quasar is 1,240 times more luminous than an entire galaxy, what is the absolute magnitude of…
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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: If you assume that a globular cluster 2 arc minutes in diameter is actually 27 pc in diameter, how…
A: The expression for the distance from small angle formula, Angular diameter206265=linear…
Q: If a standard passenger aircraft can fly at 0.37 km/s (828 mph), how long (in yr) would it take to…
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Q: how do deep images by the Hubble Space Telescope confirm the bottom-up theory of galaxy formation?
A: The bottom up model, also known as Hierarchal Clustering s the most accepted way for galaxy…
Q: Calculate the distance to a galaxy that is moving away at 1000 km.9s-1. Given the Hubble time as…
A: Hubble time is defined as the time it took a universe to reach its current state, given that…
Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +15, how far…
A: Given The apparent magnitude of the supernova, mv =+15The absolute magnitude of the supernova, Mv…
Q: If a typical halo star has an orbital velocity of 250 km/s, how long does it take to pass through…
A: A stellar halo is a spherical population of stars and globular cluster that surrounds most disk…
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: If a galaxy has an apparent radial velocity of 4000 km/s and the Hubble constant is 70 km/s/Mpc, how…
A: Hubble's law states that galaxies move away from Earth with a velocity proportional to their…
Q: If you find a galaxy that contains globular clusters that are 2" in diameter, how far away is the…
A: Given Data The diameter of cluster is:D=25 pc=7.714×1017 m The globular cluster is:θarcsecond=2…
Q: The Virgo galaxy Cluster Much smaller than the Local Group. Contains 35 galaxies.…
A: the Virgo cluster forms the heart of the larger Virgo supercluster that comprises approximately…
Q: Describe the cluster method for measuring a galaxy’s mass.
A: Cluster Method (or) Lensing cluster Mass Estimation: We know that the gravitational lensing is one…
Q: The very first "image" of a black hole, at the centre of galaxy M87, was recently taken by the Event…
A: Given: The wavelength of the hydrogen line is λ = 21 cm The diameter of the earth is D = 12742 km…
Q: Different wavelengths (frequencies) of light let us see different aspects of the galaxy, which type…
A: Required : The correct option.
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: If you assume that a globular cluster 2 arc minutes in diameter is actually 19 pc in diameter, how…
A: Given, a globular disc cluster is 2 arc minutes in diameter. The actual diameter is d = 19 pc let D…
Q: The Galactic halo contains as much gas and dust as the disk. (T/F)
A: A galactic halo is a region surrounding a galaxy. It extends beyond the visual part of the galaxy.…
Q: If we plot the apparent brightnesses of stars in a globular cluster versus their surface…
A: Given, If we plot the apparent brightness of stars in a globular cluster versus their surface…
Q: Milky Way galaxy has about 5 x 10° solar masses of gas in total. If 13 solar masses of that gas is…
A: Thousands of stars, dust particles, and gas fill the Milky Way. Observing it from the top or bottom…
Q: If a quasar is 1,980 times more luminous than an entire galaxy, what is the absolute magnitude of…
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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: you assume that a globular cluster 4 arc minutes in diameter is actually 27 pc in diameter, how far…
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Q: A two-arm spiral density wave is moving through the Galactic disk. At the 8-kpc radius of the Sun's…
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Q: If a galaxy has an apparent radial velocity of 2,319 km/s and the Hubble constant is 70 km/s/Mpc,…
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Q: If a quasar is 1,360 times more luminous than an entire galaxy, what is the absolute magnitude of…
A: The absolute magnitude of the Milky Way galaxy is mA = - 21 FB/FA = 1360 Let mB = absolute…
Q: Why are interstellar lines so narrow?
A: Spectral lines are formed due to electrons making transitions between the energy levels inside the…
Q: why does the galaxy shown below have so much dust in its disk? How big do you suppose the halo of…
A: A halo is an extended, almost spherical component of a galaxy which extends beyond the main, visible…
Q: describe the characteristics of the various kinds of interstellar gas (HII regions, neutral hydrogen…
A: Star formation is generally more active in the denser, inner part of the Milky Way than in the outer…
Q: A star at a distance of 50000 light years from the center of a galaxy has an orbital speed of 100…
A: Distance of the star from the center of the galaxy, r = 50000 ly The orbital speed of the star, v =…
Q: What temperature would interstellar dust have to have to radiate most strongly at 100 micro meter?
A: When stars die they will slowly send out their outer layers. This forms large clouds of dust and is…
Q: On a rotation curve you notice two points, A and B. Point B is twice as far from the center of the…
A: Given information: Point B is twice as far from the center of the galaxy as point A. Let "ra" be the…
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: 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: (a) Rank the following components of the interstellar medium in order of the wavelengths at which…
A: (a). Components of the interstellar medium are detected due to the interaction between photons of…
Q: Assume all Starlight in a galaxy Comes from the disk with le(R,Z) =laeRIHa Cosh (리 h) Where hz=…
A: Luminosity density is the luminosity per unit volume. This function can be written in the form,…
Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +18, how far…
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Q: If the galaxy NGC 6643 is 588 million light-years away, what is the lookback time to the galaxy?…
A: Given: Distance of galaxy NGC 588 from earth = 588 million light years We have to find the…
Q: In the reading, you were told that there were roughly 10,000 galaxies in the image of the Hubble…
A: Given: one image of hubble ultra deep field is roughly 10 square arcminutes. Number of galaxies in…
Q: If an open cluster contains 650 stars and is 27 pc in diameter, what is the average distance between…
A: Given, number of stars in cluster = 650 Diameter = 27 pc So volume of cluster = 43πD23 volume…
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