21ST C ASTRO EBOOK+SW5=SS+VGCRD+LEARN/DO
6th Edition
ISBN: 9780393870152
Author: PALEN
Publisher: Norton, W. W. & Company, Inc.
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Chapter 19, Problem 44QP
(a)
To determine
The angular size of the material ejected from the supermassive black hole in the nighttime sky in terms of degree.
(b)
To determine
To compare the size with the angular size of the moon.
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Students have asked these similar questions
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.
An astronomer observed the motions of some galaxies. Based on his observations, he made the following statements. Which one of them is most likely to be false? Take Hubble's constant to be 67 km/s/Mpc.
A. A galaxy observed to be moving away from us at a speed of 70 km/s is at a distance of about 1 Mpc from us.
B. A galaxy observed to be moving away from us at a speed of 700 km/s is at a distance of about 10 Mpc from us.
C. A galaxy observed to be moving away from us at a speed of 7000 km/s is at a distance of about 100 Mpc from us.
D. A galaxy observed to be moving away from us at a speed of 70000 km/s is at a distance of about 1 Gpc from us.
Is the answer D? Thank you!
A galaxy with a spherically symmetric distribution of matter has a mass density profile of the type p(r) ∞ 1/r, where r is the radial coordinate from the centre
of the galaxy. To what type of circular velocity (r) does this correspond?
Select one:
a. (r)
O b.
c.
O d.
(r) ~ r
(r) ~ √r
(r): = constant
Chapter 19 Solutions
21ST C ASTRO EBOOK+SW5=SS+VGCRD+LEARN/DO
Ch. 19.1 - Prob. 19.1ACYUCh. 19.1 - Prob. 19.1BCYUCh. 19.2 - Prob. 19.2CYUCh. 19.3 - Prob. 19.3CYUCh. 19.4 - Prob. 19.4CYUCh. 19 - Prob. 1QPCh. 19 - Prob. 2QPCh. 19 - Prob. 3QPCh. 19 - Prob. 4QPCh. 19 - Prob. 5QP
Ch. 19 - Prob. 6QPCh. 19 - Prob. 7QPCh. 19 - Prob. 8QPCh. 19 - Prob. 9QPCh. 19 - Prob. 10QPCh. 19 - Prob. 11QPCh. 19 - Prob. 12QPCh. 19 - Prob. 13QPCh. 19 - Prob. 14QPCh. 19 - Prob. 15QPCh. 19 - Prob. 16QPCh. 19 - Prob. 17QPCh. 19 - Prob. 18QPCh. 19 - Prob. 19QPCh. 19 - Prob. 20QPCh. 19 - Prob. 21QPCh. 19 - Prob. 22QPCh. 19 - Prob. 23QPCh. 19 - Prob. 24QPCh. 19 - Prob. 25QPCh. 19 - Prob. 26QPCh. 19 - Prob. 27QPCh. 19 - Prob. 28QPCh. 19 - Prob. 29QPCh. 19 - Prob. 30QPCh. 19 - Prob. 31QPCh. 19 - Prob. 32QPCh. 19 - Prob. 33QPCh. 19 - Prob. 34QPCh. 19 - Prob. 35QPCh. 19 - Prob. 36QPCh. 19 - Prob. 37QPCh. 19 - Prob. 38QPCh. 19 - Prob. 39QPCh. 19 - Prob. 40QPCh. 19 - Prob. 41QPCh. 19 - Prob. 42QPCh. 19 - Prob. 43QPCh. 19 - Prob. 44QPCh. 19 - Prob. 45QP
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- A star at a distance of 50000 light years from the center of a galaxy has an orbital speed of 100 km/s around the galactic center. What is the total mass of the galaxy located at distances smaller than 50000 light years from the center? A. 7.6 ×1010 solar masses B. 4.2 ×1011 solar masses C. 3.5 ×1010 solar masses D. 1.4 ×1011 solar masses Is the answer C? M = (r x v^2) / G = 50000 x 9.46e15 x (100000^2) / 6.67e-11 / 2e30 (the Sun's mass) = 3.55e10 solar massesarrow_forwardWhat happens when galaxies collide? A. Star collisions will be rare but the shapes of the galaxies will be largely distorted. B. The shapes of the galaxies will be largely distorted and many of the stars of one galaxy will collide with stars of the other galaxy. C. The shapes of the galaxies will be distorted and many stars will collide with stars of the other galaxy, as well as with other stars in the same galaxy. D. Star collisions will be rare and the two galaxies will just pass through each other without any changes. Is the answer A? Thank you!arrow_forwardThe fact that many radio lobes emit less intensely on the side of the galaxy facing away from Earth suggests that a. they are formed by material falling into the galaxy. b. they are powered by black body radiation. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets of high-speed matter in magnetic fields, which tend to emit photons in the direction they are moving.arrow_forward
- 2. A galaxy cluster has a galaxy behind it whose image we see as being smeared out and curved, with an angular radius of curvature on the sky of θE. The background galaxy is at redshift zgal and the cluster is at zclust. What is the mass of the cluster in solar masses? Give your response in scientific notation with one decimal place. (The Hubble constant is of course 70 km/s/Mpc, and you can assume the Hubble law for these low redshifts). Values: zgal = 0.11 zclust = 0.07 θE = 117.4 arcsecondsarrow_forwardThe traditional theory states that our galaxy formed a. as a large spherical cloud of gas that was rotating very slowly. b. from a large cloud of material that broke off from a larger galaxy. c. from material that had been ejected in the violent explosion of a dying galaxy. d. as a result of mergers between several smaller groups of gas, dust, and stars. e. as two massive galaxies collided.arrow_forwardRadio maps of the spiral arms of our galaxy a. reveal that our galaxy is a grand design spiral. b. map the location of hot O and B stars by the radio radiation they emit. c. reveal that the spiral arms are winding up and growing closer together. d. reveal that the sun is currently located in the center of a spiral arm. e. map the location of dense neutral hydrogen clouds.arrow_forward
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