American Journal of Astronomy and Astrophysics

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Volume 9, Issue 2, June 2021

  • Intergalactic Media Densities of Extragalactic Radio Sources and Source Ages

    Ezeugo Jeremiah Chukwuemerie

    Issue: Volume 9, Issue 2, June 2021
    Pages: 13-17
    Received: 16 March 2021
    Accepted: 30 March 2021
    Published: 20 April 2021
    DOI: 10.11648/j.ajaa.20210902.11
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    Abstract: In this paper, we use analytical methods with some plausible assumptions to develop a mathematical model which may be used to obtain estimate of density of the intergalactic medium (IGM). This relation suggests that the plot of the linear sizes against the bolometric luminosities of the extragalactic radio sources in our sample should be able to fu... Show More
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  • About the Free and Forced Nutation: The Daily Nutation

    Monica Zoe Ciobanu

    Issue: Volume 9, Issue 2, June 2021
    Pages: 18-21
    Received: 22 March 2021
    Accepted: 14 April 2021
    Published: 8 May 2021
    DOI: 10.11648/j.ajaa.20210902.12
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    Abstract: To explain the nutation phenomenon, Euler chose a geocentric frame of coordinates to present his dynamical equations. In accordance with his formulas, the nutation is caused by a momentum relative to the Earth's center, due to certain external forces. Further, Poinsot presented a special case of the Euler's equations, when any momentum of those cer... Show More
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