Ay 20 Lab Assignments
- Observing Proposal (due 13 October 2008)
- Details of the accepted proposals.
- Students working on the projects:
- Tumbling asteroid: Landers, Maseda, Hensley
- Star formation in interacting galaxies: Forbes (theory),
Karkare (filters), Feldman and Silsbee (local and integrated Halpha fluxes),
- ??: Taak
- As of Nov 17 2008, the calibration star data and the
off-band and on-band Halpha galaxy images
are available for the two interacting galaxy pairs, Arp 140 and NGC 520, and
NGC2339 (the non-interacting `control' galaxy). The images of the latter
are shown below [off-band (L) and on-band Halpha (R)]
- As of Nov 17 2008, the full set of asteroid data is in hand.
Drew's instructions on how to access and manipulate the
here. See Drew for the username
- Some references that may be helpful in the tumbling asteroid project:
- Some references that may be helpful in the Halpha project:
- The list of P60 narrowband filters is
Rest Halpha is at 6563 Angstrom (in sealevel air; it is
6565 in vacuum). The filter names are supposed to be the
central wavelengths and widths
e.g. 6564/21 should be the rest Halpha filter, 21 Angstroms width.
So in principle they cover
the redshift range up to (6640/6563 -1) i.e. z=0 to 0.012 or
radial velocities up to 3,500km/s (galaxy distances to 50Mpc).
HOWEVER All the transmission graphs are clearly wrong, and some of the names
may be wrong too: e.g. 6564/100 looks nothing like 6563/100, and why
would there be two filters 100 Angstroms wide with centers only 1 Angstrom
Considering the 6564/21 filter the transmission
graph peaks at 6576 Angstroms, not 6564, and it has a FWHM of about 30
Angstroms and a full width zero intensity of about 66 Angstroms. If the
graph were correct, the equivalent width of the filter would be about
13 Angstroms. None of these reflect the /21 extension. All the
other filter graphs have the same issue. Someone should remeasure these
filters and make sure they are labelled properly!
- Writeup: due in class Friday Dec 5. That class will be devoted
to oral presentations of the results. Please prepare slides in
Open Office/PowerPoint/Keynote or other similar format of your choice.
Writeups should follow the format:
- Introduction -explaining why the project is interesting, scientific context. Motivating the project.
- Data Gathering -explain what data was gathered, when, with what instruments/filters/standards.
- Data Reduction -explain all the steps and software, equations, etc you used to convert the raw data into scientifically useful numbers for the next step:
- Analysis -explain the concepts and equations you used to get
meaningful scientific conclusions from the data.
- Conclusion -summarize the results and put them in broader scientific context. What would you do differently next time?
- Bibliography of references used.