A New Technique for Measuring Absolute Proper Motions with HST: Using Background Galaxies as Positional References

Details A New Technique for Measuring Absolute Proper Motions with HST: Using Background Galaxies as Positional References A New Technique for Measuring Absolute Proper Motions with HST: Using Background Galaxies as Positional References

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..35s&link_type=abstract

"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T

Astronomy and Astrophysics

Astronomy

Scientific paper

Over the past few years, it has been demonstrated that HST is well suited for high accuracy astrometric sciences. For example, HST's imagers have been used to measure relative proper motions of stars for deriving the internal dynamics of globular clusters. Absolute proper motions have also been measured in several studies but so far, most of them relied on a single reference object, a quasi-stellar object (QSO) within the field. In this work, we present a new way of measuring proper motions of stars. Instead of relying on background QSOs, we developed a technique that uses numerous background galaxies as positional references. We discuss this technique in detail and demonstrate how well we are able to measure proper motions of stars. Our new method can in principle be applied to any existing multi-epoch HST data and opens up a possibility to measure accurate transverse motions for galaxies out to a few Mpc.

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