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The origin of the nano-Hertz stochastic gravitational wave background: the contribution from supermassive black-hole binaries
Jean J. Somalwar, Vikram Ravi
The nano-Hertz gravitational wave background (GWB) is a key probe of supermassive black hole (SMBH) formation and evolution, if the background arises predominantly from binary SMBH…
Deep Synoptic Array science: a 50 Mpc fast radio burst constrains the mass of the Milky Way circumgalactic medium
Vikram Ravi, Morgan Catha, Ge Chen +21
We present the Deep Synoptic Array (DSA-110) discovery and interferometric localization of the so far non-repeating FRB 20220319D. The FRB originates in a young, rapidly star-formi…
New Tests of Millilensing in the Blazar PKS 1413+135
A. L. Peirson, I. Liodakis, A. C. S. Readhead +26
Symmetric Achromatic Variability (SAV) is a rare form of radio variability in blazars that has been attributed to gravitational millilensing by a ~ mass cond…
Measuring interstellar turbulence in fast radio burst host galaxies
Dana Simard, Vikram Ravi
Turbulence is a vital part of the interstellar medium (ISM) of galaxies, contributing significantly to galaxy energy budgets and acting as a regulator of star formation. Despite th…
The observed impact of galaxy halo gas on fast radio bursts
Liam Connor, Vikram Ravi
Galaxies and groups of galaxies exist in dark-matter halos filled with diffuse gas. The diffuse gas represents up to 80\% of the mass in baryonic matter within the halos(1,2), but…
The Relativistic Jet Orientation and Host Galaxy of the Peculiar Blazar PKS 1413+135
A. C. S. Readhead, V. Ravi, I. Liodakis +26
PKS 1413+135 is one of the most peculiar blazars known. Its strange properties led to the hypothesis almost four decades ago that it is gravitationally lensed by a mass concentrati…
Finding Strong Gravitational Lenses in the DESI DECam Legacy Survey
X. Huang, M. Domingo, A. Pilon +17
We perform a semi-automated search for strong gravitational lensing systems in the 9,000 deg Dark Energy Camera Legacy Survey (DECaLS), part of the DESI Legacy Imaging Surveys…
Extreme radio-wave scattering associated with hot stars
Mark Walker, Artem Tuntsov, Hayley Bignall +5
We use data on extreme radio scintillation to demonstrate that this phenomenon is associated with hot stars in the solar neighbourhood. The ionized gas responsible for the scatteri…
Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array
J. B. Wang, G. Hobbs, W. Coles +17
Anisotropic bursts of gravitational radiation produced by events such as super-massive black hole mergers leave permanent imprints on space. Such gravitational wave "memory" (GWM)…