ALFALFA

Spring 2013 EGGs page

5.0   Coordinates, coordinates, coordinates

To the right is a map of how galactic coordinates project onto equatorial coordinates.

What parts of the Galaxy are included in ALFALFA?

And, conversely, what are not?
click on image to enlarge




To the right is a map of how equatorial coordinates project onto galactic coordinates.

What parts of the galactic plane are included in ALFALFA? Can be seen from Arecibo?

And, conversely, what are not?
click on image to enlarge




5.1   More coordinates

Supergalactic coordinates are sometimes presented as (l,b) and (x,y,z) style. What are standards of both? Check out how this all works in flowmodel_dist.pro.



5.2  The Andromeda satellite plane

In a recent paper, Ibata+ 2013 claim that a significant fraction of M31's satellites are distributed in a highly planar structure. Make a plot like their Figure 1 showing the ALFALFA coverage of that region (i.e. in galactic l,b). Make another plot in RA,Dec showing how their proposed plane of satellites falls on the fall ALFALFA sky. This would be good to share with in group meeting (say Feb 19th?)



5.2  Gas disks in galaxies: star formation thresholds



5.3  HI and star formation in low metallicity galaxies

Read the paper Ekta, Chengalur & Pustilnik 2008 on HI and star formation in the most metal-deficient galaxies.




Last modified: Wed Feb 6 10:01:56 EST 2013 by martha