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The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations
Gabriella Agazie, Jeremy G. Baier, Paul T. Baker +86
Pulsar timing array observations have found evidence for an isotropic gravitational wave background with the Hellings-Downs angular correlations, expected from general relativity.…
Searching for the Highest-z Dual AGN in the Deepest Chandra Surveys
Brandon Sandoval, Adi Foord, Steven W. Allen +9
We present an analysis searching for dual AGN among 62 high-redshift () X-ray sources selected from publicly available deep Chandra fields. We aim to quantify the fr…
Comparing recent PTA results on the nanohertz stochastic gravitational wave background
The International Pulsar Timing Array Collaboration, G. Agazie, J. Antoniadis +242
The Australian, Chinese, European, Indian, and North American pulsar timing array (PTA) collaborations recently reported, at varying levels, evidence for the presence of a nanohert…
The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background
Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald +111
The NANOGrav 15-year data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can source such low-frequency gr…
The NANOGrav 15-year Data Set: Search for Signals from New Physics
Adeela Afzal, Gabriella Agazie, Akash Anumarlapudi +120
The 15-year pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) shows positive evidence for the presence of a low-freque…
The NANOGrav 15-year Data Set: Observations and Timing of 68 Millisecond Pulsars
Gabriella Agazie, Md Faisal Alam, Akash Anumarlapudi +97
We present observations and timing analyses of 68 millisecond pulsars (MSPs) comprising the 15-year data set of the North American Nanohertz Observatory for Gravitational Waves (NA…
The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald +111
We report multiple lines of evidence for a stochastic signal that is correlated among 67 pulsars from the 15-year pulsar-timing data set collected by the North American Nanohertz O…
Intermediate-mass black holes and the fundamental plane of black hole accretion
Kayhan Gültekin, Kristina Nyland, Nichole Gray +7
We present new 5 GHz VLA observations of a sample of 8 active intermediate-mass black holes with masses found in galaxies with stellar masses $…
Evidence for variability timescale dependent UV/X-ray delay in Seyfert 1 AGN NGC 7469
Mayukh Pahari, Ian M. McHardy, Federico Vincentelli +5
Using a month-long X-ray lightcurve from /PCA and 1.5 month long UV continuum lightcurves from spectra in 12201970 , we performed a detailed time-lag…
A Second Look at 12 Candidate Dual AGNs using
Adi Foord, Kayhan Gültekin, Rebecca Nevin +5
We present an analysis of 12 optically selected dual AGN candidates at . Each candidate was originally identified via double-peaked [O III] 5007 emission lines, and ha…
Flows of X-ray gas reveal the disruption of a star by a massive black hole
Jon M. Miller, Jelle S. Kaastra, M. Coleman Miller +18
Tidal forces close to massive black holes can violently disrupt stars that make a close approach. These extreme events are discovered via bright X-ray and optical/UV flares in gala…