Question

4. (6 pts) You are tired after a night of observing but still need to collect flat fields. a. Explain why you need flatfield measurements when doing photometric observations with a ground-based telescope. b. You take your first flatfield and measure the mean flux to be 1000 adu. Assuming the camera gain is 2 e-/adu and read noise is 4e-, how many more frames (with mean 1000adu) will you need to have a master-flat with an SNR ~100?

          4. (6 pts) You are tired after a night of observing but still need to collect flat fields.
a. Explain why you need flatfield measurements when doing photometric
observations with a ground-based telescope.
b. You take your first flatfield and measure the mean flux to be 1000 adu. Assuming the camera gain is 2 e-/adu and read noise is 4e-, how many
more frames (with mean 1000adu) will you need to have a master-flat with
an SNR ~100?

4. (6 pts) You are tired after a night of observing but still need to collect flat fields.
a. Explain why you need flatfield measurements when doing photometric
observations with a ground-based telescope.
b. You take your first flatfield and measure the mean flux to be 1000 adu. Assuming the camera gain is 2 e-/adu and read noise is 4e-, how many
more frames (with mean 1000adu) will you need to have a master-flat with
an SNR 100?

Added by Joyce S.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Lien Le

Step 1

Flat-field measurements are necessary when doing photometric observations with a ground-based telescope because they help correct for any non-uniformities or variations in the sensitivity of the detector (camera) and the optics of the telescope. These Show more…

Show all steps

Thanks for your feedback!

4. (6 pts) You are tired after a night of observing but still need to collect flat fields. a. Explain why you need flat-field measurements when doing photometric observations with a ground-based telescope. b. You take your first flat-field and measure the mean flux to be 1000 adu. Assuming the camera gain is 2 e-/adu and read noise is 4e-, how many more frames (with a mean of 1000 adu) will you need to have a master-flat with an SNR ~ 100?