2007-07-22

one trivial faint-source proper motion

On Friday I measured the proper motion of a high-redshift quasar, one that is not visible in any individual SDSS epoch, but visible in the stacked image, by fitting simultaneously all the pixels in all the individual images, and then marginalizing over the unknowns (flux and position). I got zero, to within the errors. Woo-hoo!

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