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The Era of Binary Supermassive Black Holes: Coordination of Nanohertz-Frequency Gravitational-Wave Follow-up
Sarah Burke-Spolaor, Tamara Bogdanović, Daniel J. D'Orazio +9
Here we summarize discussions and conclusions from the conference ``The Era of Binary Supermassive Black Holes: Coordination of Nanohertz-Frequency Gravitational-Wave Follow-up,''…
Prevalence of Compact Nuclear Radio Emission in Post-Merger Galaxies and its Origin
Gregory Walsh, Sarah Burke-Spolaor
Post-merger galaxies are unique laboratories to study the triggering and interplay of star-formation and AGN activity. Combining new, high resolution, 10 GHz Jansky Very Large Arra…
A VLBI Proper Motion Analysis of the Recoiling Supermassive Black Hole Candidate Mrk 1018
Gregory Walsh, Sarah Burke-Spolaor, T. Joseph W. Lazio
Mrk 1018 is a nearby changing-look AGN that has oscillated between spectral Type 1.9 and Type 1 over a period of 40 years. Recently, a recoiling supermassive black hole (rSMBH) sce…
The NANOGrav 12.5-year Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries
Zaven Arzoumanian, Paul T. Baker, Laura Blecha +75
Pulsar timing array collaborations, such as the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), are seeking to detect nanohertz gravitational waves emitted…
Deep VLBI Observations Challenge Previous Evidence of a Binary Supermassive Black Hole Residing in the Seyfert Galaxy NGC 7674
Peter Breiding, Sarah Burke-Spolaor, Tao An +4
Previous Ku-band (15 GHz) imaging with data obtained from the Very Long Baseline Array (VLBA) had shown two compact, sub-pc components at the location of a presumed kpc-scale radio…
Quasars with Periodic Variability: Capabilities and Limitations of Bayesian Searches for Supermassive Black Hole Binaries in Time-Domain Surveys
Caitlin A. Witt, Maria Charisi, Stephen R. Taylor +1
Supermassive black hole binaries (SMBHBs) are an inevitable consequence of galaxy mergers. At subparsec separations, they are practically impossible to resolve, and the most promis…
The Search for Binary Supermassive Black Holes Amongst Quasars with Offset Broad Lines Using the Very Long Baseline Array
Peter Breiding, Sarah Burke-Spolaor, Michael Eracleous +4
In several previous studies, quasars exhibiting broad emission lines with >1000 km/s velocity offsets with respect to the host galaxy rest frame have been discovered. One leading h…
The NANOGrav 11yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500Mpc
Zaven Arzoumanian, Paul T. Baker, Adam Brazier +54
Supermassive black hole binaries (SMBHBs) should form frequently in galactic nuclei as a result of galaxy mergers. At sub-parsec separations, binaries become strong sources of low-…
Multi-Messenger Gravitational Wave Searches with Pulsar Timing Arrays: Application to 3C66B Using the NANOGrav 11-year Data Set
Zaven Arzoumanian, Paul T. Baker, Adam Brazier +56
When galaxies merge, the supermassive black holes in their centers may form binaries and, during the process of merger, emit low-frequency gravitational radiation in the process. I…
Detecting Offset Active Galactic Nuclei
Laura Blecha, Walter Brisken, Sarah Burke-Spolaor +5
Gravitational wave (GW) and gravitational slingshot recoil kicks, which are natural products of SMBH evolution in merging galaxies, can produce active galactic "nuclei" that are of…
Supermassive Black-hole Demographics & Environments With Pulsar Timing Arrays
Stephen R. Taylor, Sarah Burke-Spolaor, Paul T. Baker +6
Precision timing of large arrays (>50) of millisecond pulsars will detect the nanohertz gravitational-wave emission from supermassive binary black holes within the next ~3-7 years.…
Astro2020 science white paper: The gravitational wave view of massive black holes
Monica Colpi, Kelly Holley-Bockelmann, Tamara Bogdanovic +16
Coalescing, massive black-hole (MBH) binaries are the most powerful sources of gravitational waves (GWs) in the Universe, which makes MBH science a prime focus for ongoing and upco…
Investigating the Candidate Displaced Active Galactic Nucleus in NGC 3115
Megan L. Jones, Sarah Burke-Spolaor, Kristina Nyland +1
The nearby galaxy NGC 3115 contains a known radio-emitting, low-luminosity active galactic nucleus (AGN), and was recently claimed to host a candidate AGN displaced 14.3 pc from th…
Constraints on the HI Mass of NGC 1052-DF2
Amy Sardone, D. J. Pisano, Sarah Burke-Spolaor +2
We report deep, single-dish 21 cm observations of NGC 1052-DF2, taken with the Green Bank Telescope. NGC 1052-DF2, proposed to be lacking in dark matter, is currently classified as…
The NANOGrav 11-Year Data Set: Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries
K. Aggarwal, Z. Arzoumanian, P. T. Baker +60
Observations indicate that nearly all galaxies contain supermassive black holes (SMBHs) at their centers. When galaxies merge, their component black holes form SMBH binaries (SMBHB…
Science with an ngVLA: Offset Active Galactic Nuclei
Laura Blecha, Walter Brisken, Sarah Burke-Spolaor +5
Gravitational-wave (GW) and gravitational slingshot recoil kicks, which are natural products of SMBH evolution in merging galaxies, can produce active galactic "nuclei" that are of…
The Next-Generation Very Large Array: Supermassive Black Hole Pairs and Binaries
Sarah Burke-Spolaor, Laura Blecha, Tamara Bogdanovic +7
The Next-Generation Very Large Array (ngVLA) has the potential to be a workhorse for the discovery and study of paired supermassive black holes either at large separations (dual) o…
The Local Nanohertz Gravitational-Wave Landscape From Supermassive Black Hole Binaries
Chiara M. F. Mingarelli, T. Joseph W. Lazio, Alberto Sesana +6
Supermassive black hole binaries (SMBHBs) in the 10 million to 10 billion range form in galaxy mergers, and live in galactic nuclei with large and poorly constrained conc…
Constraints on Black Hole/Host Galaxy Co-evolution and Binary Stalling Using Pulsar Timing Arrays
Joseph Simon, Sarah Burke-Spolaor
Pulsar timing arrays are now setting increasingly tight limits on the gravitational wave background from binary supermassive black holes. But as upper limits grow more constraining…
The NANOGrav Nine-year Data Set: Limits on the Isotropic Stochastic Gravitational Wave Background
Zaven Arzoumanian, Adam Brazier, Sarah Burke-Spolaor +45
We compute upper limits on the nanohertz-frequency isotropic stochastic gravitational wave background (GWB) using the 9-year data release from the North American Nanohertz Observat…
A Study of Multi-frequency Polarization Pulse Profiles of Millisecond Pulsars
S. Dai, G. Hobbs, R. N. Manchester +23
We present high signal-to-noise ratio, multi-frequency polarization pulse profiles for 24 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array (PPT…
NANOGrav Constraints on Gravitational Wave Bursts with Memory
Z. Arzoumanian, A. Brazier, S. Burke-Spolaor +39
Among efforts to detect gravitational radiation, pulsar timing arrays are uniquely poised to detect "memory" signatures, permanent perturbations in spacetime from highly energetic…
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)…
An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set
X. -J. Zhu, G. Hobbs, L. Wen +16
We present results of an all-sky search in the Parkes Pulsar Timing Array (PPTA) Data Release 1 data set for continuous gravitational waves (GWs) in the frequency range from $5\tim…