Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 26, Problem 46Q
To determine
(a)
The mass of the neutrino.
To determine
(b)
The reason for the massive neutrinos to not be the dominant type of dark matter in the universe.
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Students have asked these similar questions
If a quasar has a recessional velocity of 2.7 × 10 5 km/sec and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone?
a.
50 km/sec/Mpc
b.
9.7 × 108 km/sec/Mpc
c.
75 km/sec/Mpc
d.
0.013 km/sec/Mpc
e.
273,600 km/sec/Mpc
What is the total energy of all the radiation in the current Hubble Radius?
H0 = 70 km/s/Mps
omega(radation) 0 = 9.0 x 10^-5
What would be the critical density of matter in the universe if the value of the Hubble constant were (a) 40 km/sec/ Mpc? (b) 90 km/sec/Mpc?
Chapter 26 Solutions
Universe: Stars And Galaxies
Ch. 26 - Prob. 1QCh. 26 - Prob. 2QCh. 26 - Prob. 3QCh. 26 - Prob. 4QCh. 26 - Prob. 5QCh. 26 - Prob. 6QCh. 26 - Prob. 7QCh. 26 - Prob. 8QCh. 26 - Prob. 9QCh. 26 - Prob. 10Q
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- If the average density of the Universe is small compared with the critical density, the expansion of the Universe described by Hubble's law proceeds with speeds that are nearly constant over time. Calculate t since the big bang, assuming H = 22.0 km/s/Mly.arrow_forwardwhy is it difficult to measure the Hubble constant?arrow_forward(a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an approximate value, assume the expansion rate is constant and calculate the speed at which two galaxies must move apart to be separated by 1 Mly (present average galactic separation) in a time of 1010 y. (b) Similarly, what Hubble constant corresponding to a universe approximately old?arrow_forward
- Is the Hubble constant actually constant?arrow_forwardThe CMB contains roughly 400 million photons per m3. The energy of each photon depends on its wavelength. Calculate the typical wavelength of a CMB photon. Hint: The CMB is blackbody radiation at a temperature of 2.73 K. According to Wien’s law, the peak wave length in nanometers is given by max=3106T . Calculate the wavelength at which the CMB is a maximum and, to make the units consistent, convert this wavelength from nanometers to meters.arrow_forwardIn the Benchmark Model, what is the total mass of all the matter within the current Hubble Radius (Length)? Values: Assume H0=70 km/s/Mpc Ωm,0=0.3 Your answer must be in units of Solar Masses and in scientific notation and include one decimal place (2 sig figs).arrow_forward
- Assuming the matter temperature equalled the radiation temperature at the recombinationepoch, evaluate MJ in a Friedmann universe of a given (h0, Ω0) with the present temperatureT0 = 3K of the microwave background.arrow_forwardIf a galaxy is 9.2 Mpc away from Earth and recedes at 475 km/s, what is H0 (in km/s/Mpc)?arrow_forwardWhat is Hubble constant?arrow_forward
- A galaxy is observed to recede at speed 140 km/s. If the Hubble constant is 70 km/s/ Mpc, how far is the galaxy?arrow_forwardWhat effect does increasing the interaction strength of a massive particle species haveon its thermal relic abundance if it was in thermal equilibrium in the early universe(assuming no initial asymmetry)? a. relic abundance increases b. relic abundance decreases c. relic abundance essentially unchanged d. not enough informationarrow_forwardImagine that an observed distant galaxy is measured to have a distance of 40 Mpc by a Type Ia supernovae and the redshift of the galaxy indicates the galaxy appears to be moving away from us at a speed of 2400 km/s. What would the Hubble constant be if measured solely based on this galaxy in units of km/s/Mpc?arrow_forward
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