Geometric Distance Measurement. II.

Details Geometric Distance Measurement. II. Geometric Distance Measurement. II.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470..195s&link_type=abstract

Astrophysical Journal v.470, p.195

Astronomy and Astrophysics

Astronomy

12

Galaxies: Distances And Redshifts, Polarization, Stars: Supernovae: General

Scientific paper

Sparks proposed a geometric way to measure the distances of galaxies, from imaging polarization observations of supernova light echoes. Here, a simple extension of that method of geometric distance determination is described: measurement of the proper motion of polarized light echoes. This requires measurement at more than one epoch, unlike the original technique, and is technically more difficult. However, in principle, it is far more widely applicable. Measurement of high polarization from scattered light (i.e., a light echo) constrains the scattering angle to be close to 90^deg^ and so the intrinsic speed of motion of the echo will be close to c transverse to the line of sight. If the proper motion, i.e., apparent angular speed, is obtained, then the distance follows immediately. Scattered light from any transient or highly variable source of illumination, such as active galactic nuclei or novae as well as supernovae, may be used in this case.

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