Question

2. Approximate the Galaxy as a uniform disk of constant thickness, with the Sun halfway between the top & the bottom. Consider the line of sight at an angle b away from the Galactic plane. Note: The sketch shows the Galactic disk "edge-on". a. Show that (except for very small b), the optical depth of extinction by interstellar dust in the disk must approximately obey $\tau \approx \csc(b)$ b. At what Galactic latitudes (i.e. what range of b) would an astronomer want to observe other galaxies without having to worry much about extinction?

          2. Approximate the Galaxy as a uniform disk of constant thickness, with the Sun halfway between the
top & the bottom. Consider the line of sight at an angle b away from the Galactic plane. Note: The
sketch shows the Galactic disk "edge-on".
a. Show that (except for very small b), the
optical depth of extinction by
interstellar dust in the disk must
approximately obey $\tau \approx \csc(b)$
b. At what Galactic latitudes (i.e. what range of b) would an astronomer want to observe other
galaxies without having to worry much about extinction?

2. Approximate the Galaxy as a uniform disk of constant thickness, with the Sun halfway between the
top the bottom. Consider the line of sight at an angle b away from the Galactic plane. Note: The
sketch shows the Galactic disk "edge-on".
a. Show that (except for very small b), the
optical depth of extinction by
interstellar dust in the disk must
approximately obey τ≈csc(b)
b. At what Galactic latitudes (i.e. what range of b) would an astronomer want to observe other
galaxies without having to worry much about extinction?

Added by Adam S.

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