Quasar Proper Motions and Low-Frequency Gravitational Waves

Details Quasar Proper Motions and Low-Frequency Gravitational Waves Quasar Proper Motions and Low-Frequency Gravitational Waves

1996-10-12

arxiv.org/abs/astro-ph/9610086v1

Astrophys.J. 485 (1997) 87-91

Astronomy and Astrophysics

Astrophysics

15 pages, 1 figure. Also available at http://charm.physics.ucsb.edu:80/people/cgwinn/cgwinn_group/index.html

Scientific paper

10.1086/304424

We report observational upper limits on the mass-energy of the cosmological gravitational-wave background, from limits on proper motions of quasars. Gravitational waves with periods longer than the time span of observations produce a simple pattern of apparent proper motions over the sky, composed primarily of second-order transverse vector spherical harmonics. A fit of such harmonics to measured motions yields a 95%-confidence limit on the mass-energy of gravitational waves with frequencies <2e-9 Hz, of <0.11/h*h times the closure density of the universe.

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