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arxiv: astro-ph/0409637 · v1 · submitted 2004-09-27 · 🌌 astro-ph

Observing Gravitational Radiation with QSO Proper Motions and the SKA

Andrew H. Jaffe This is my paper
classification 🌌 astro-ph
keywords frequencygravitationalmotionsproperradiationabilitybandbeams
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We discuss the ability of the SKA to observe QSO proper motions induced by long-wavelength gravitational radiation. We find that the SKA, configured for VLBI with multiple beams at high frequency (8 GHz), is sensitive to a dimensionless characteristic strain of roughly $10^{-13}$, comparable to (and with very different errors than) other methods in the 1/yr frequency band such as pulsar timing.

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  1. First astrometric constraints on parity-violation in the gravitational wave background

    astro-ph.CO 2025-05 unverdicted novelty 7.0

    First astrometric constraints on parity-violating SGWB amplitude are reported as h70²ΩV = -0.020 ± 0.025 (Gaia) and -0.004 ± 0.010 (VLBA) at 2σ, consistent with zero, over 4.2e-18 Hz to 1.1e-8 Hz.