1) Assume there are only two phases in the interstellar medium, bot...

  1. Home
  2. Homework Library
  3. Physics
  4. Astrophysics
  5. 1) Assume there are only two phases in the interstellar medium, bot...

QuestionQuestion

Transcribed TextTranscribed Text

1) Assume there are only two phases in the interstellar medium, both atomic. The first is the cold neutral medium (CNM), characterized by a kinetic temperature of 80 K and the 21 cm hydrogen line width (FWHM) of 2 km/s. The other phase is the warm neutral medium (WNM) and assume it has a kinetic temperature of 8000 K and is characterized by a line width (FWHM) of 20 km/s. Assuming no turbulence, answer the following questions: a) What column density of HI produces a line center optical depth in the 21-cm line of unity for both the CNM and the WNM phases? b) Measurements of HI towards distance radio sources have shown a typical optical depth due to the CNM phase is 0.5. If the density of the CNM phase is 100 cm-3, estimate the typical size and mass of these CGM clouds.

Solution PreviewSolution Preview

These solutions may offer step-by-step problem-solving explanations or good writing examples that include modern styles of formatting and construction of bibliographies out of text citations and references. Students may use these solutions for personal skill-building and practice. Unethical use is strictly forbidden.

    By purchasing this solution you'll be able to access the following files:
    Solution.pdf.

    $33.00
    for this solution

    PayPal, G Pay, ApplePay, Amazon Pay, and all major credit cards accepted.

    Find A Tutor

    View available Astrophysics Tutors

    Get College Homework Help.

    Are you sure you don't want to upload any files?

    Fast tutor response requires as much info as possible.

    Decision:
    Upload a file
    Continue without uploading

    SUBMIT YOUR HOMEWORK
    We couldn't find that subject.
    Please select the best match from the list below.

    We'll send you an email right away. If it's not in your inbox, check your spam folder.

    • 1
    • 2
    • 3
    Live Chats