Find the entry of this object in the
ALFALFA archive, and use the
images and links there to find the answers to these questions. As always, it is most important
that you understand how to derive quantitative answers and their uncertainties.
- Estimate the distance to this galaxy. Do you get the same answer as the value given
in the ALFALFA database?
- Compute the HI mass of the galaxy. Do you get the same answer as the value given
in the ALFALFA database?
- What lines are seen in the SDSS spectrum? What does the spectrum
imply about this galaxy?
- Calculate the stellar mass of the galaxy. This won't be straightforward;
explain your method and its uncertainties.
- Estimate the total mass of the galaxy. This won't be straightforward;
explain your method and its uncertainties.
- The ALFALFA spectral plot shows a break (no data) at around 15600
km/s. Why? What is the frequency (in MHz) does that velocity
correspond to?
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SDSS link
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