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1. Fast wavelet basis search for generic gravitational wave bursts in Pulsar Timing Array data

Author

Taylor, Jacob A., Burnette, Rand, Bécsy, Bence, and Cornish, Neil J.

Subjects
General Relativity and Quantum Cosmology, Astrophysics - High Energy Astrophysical Phenomena
Abstract

As we move into an era of more sensitive pulsar timing array data sets, we may be able to resolve individual gravitational wave sources from the stochastic gravitational wave background. While some of these sources, like orbiting massive black hole binaries, have well-defined waveform models, there could also be signals present with unknown morphology. This motivates the search for generic gravitational-wave bursts in a signal-agnostic way. However, these searches are computationally prohibitive due to the expansive parameter space. In this paper we present QuickBurst, an algorithm with a re-defined likelihood that lets us expedite Markov chain Monte Carlo sampling for a subset of the signal parameters by avoiding repeated calculations of costly inner products. This results in an overall speedup factor of $\sim$200 on realistic simulated datasets, which is sufficient to make generic gravitational-wave burst searches feasible on current and growing pulsar timing array datasets., Comment: 13 pages, 7 figures, submitted to PRD

Published
2024

2. The NANOGrav 15-year data set: Search for Transverse Polarization Modes in the Gravitational-Wave Background

Author

Agazie, Gabriella, Anumarlapudi, Akash, Archibald, Anne M., Arzoumanian, Zaven, Baier, Jeremy, Baker, Paul T., Bécsy, Bence, Blecha, Laura, Brazier, Adam, Brook, Paul R., Burke-Spolaor, Sarah, Burnette, Rand, Case, Robin, Casey-Clyde, J. Andrew, Charisi, Maria, Chatterjee, Shami, Cohen, Tyler, Cordes, James M., Cornish, Neil J., Crawford, Fronefield, Cromartie, H. Thankful, Crowter, Kathryn, DeCesar, Megan E., DeGan, Dallas, Demorest, Paul B., Dolch, Timothy, Drachler, Brendan, Ferrara, Elizabeth C., Fiore, William, Fonseca, Emmanuel, Freedman, Gabriel E., Garver-Daniels, Nate, Gentile, Peter A., Glaser, Joseph, Good, Deborah C., Gültekin, Kayhan, Hazboun, Jeffrey S., Jennings, Ross J., Johnson, Aaron D., Jones, Megan L., Kaiser, Andrew R., Kaplan, David L., Kelley, Luke Zoltan, Kerr, Matthew, Key, Joey S., Laal, Nima, Lam, Michael T., Lamb, William G., Lazio, T. Joseph W., Lewandowska, Natalia, Liu, Tingting, Lorimer, Duncan R., Luo, Jing, Lynch, Ryan S., Ma, Chung-Pei, Madison, Dustin R., McEwen, Alexander, McKee, James W., McLaughlin, Maura A., McMann, Natasha, Meyers, Bradley W., Mingarelli, Chiara M. F., Mitridate, Andrea, Natarajan, Priyamvada, Ng, Cherry, Nice, David J., Ocker, Stella Koch, Olum, Ken D., Pennucci, Timothy T., Perera, Benetge B. P., Pol, Nihan S., Radovan, Henri A., Ransom, Scott M., Ray, Paul S., Romano, Joseph D., Saffer, Alexander, Sardesai, Shashwat C., Schmiedekamp, Ann, Schmiedekamp, Carl, Schmitz, Kai, Shapiro-Albert, Brent J., Siemens, Xavier, Simon, Joseph, Siwek, Magdalena S., Stairs, Ingrid H., Stinebring, Daniel R., Stovall, Kevin, Sun, Jerry P., Susobhanan, Abhimanyu, Swiggum, Joseph K., Taylor, Jacob A., Taylor, Stephen R., Turner, E., Unal, Caner, Vallisneri, Michele, Vigeland, Sarah J., Wahl, Haley M., Witt, Caitlin A., and Young, Olivia

Subjects
General Relativity and Quantum Cosmology, Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Recently we found compelling evidence for a gravitational wave background with Hellings and Downs (HD) correlations in our 15-year data set. These correlations describe gravitational waves as predicted by general relativity, which has two transverse polarization modes. However, more general metric theories of gravity can have additional polarization modes which produce different interpulsar correlations. In this work we search the NANOGrav 15-year data set for evidence of a gravitational wave background with quadrupolar Hellings and Downs (HD) and Scalar Transverse (ST) correlations. We find that HD correlations are the best fit to the data, and no significant evidence in favor of ST correlations. While Bayes factors show strong evidence for a correlated signal, the data does not strongly prefer either correlation signature, with Bayes factors $\sim 2$ when comparing HD to ST correlations, and $\sim 1$ for HD plus ST correlations to HD correlations alone. However, when modeled alongside HD correlations, the amplitude and spectral index posteriors for ST correlations are uninformative, with the HD process accounting for the vast majority of the total signal. Using the optimal statistic, a frequentist technique that focuses on the pulsar-pair cross-correlations, we find median signal-to-noise-ratios of 5.0 for HD and 4.6 for ST correlations when fit for separately, and median signal-to-noise-ratios of 3.5 for HD and 3.0 for ST correlations when fit for simultaneously. While the signal-to-noise-ratios for each of the correlations are comparable, the estimated amplitude and spectral index for HD are a significantly better fit to the total signal, in agreement with our Bayesian analysis., Comment: 11 pages, 5 figures

Published
2023

3. The NANOGrav 12.5-year Data Set: Search for Gravitational Wave Memory

Author

Agazie, Gabriella, Arzoumanian, Zaven, Baker, Paul T., Bécsy, Bence, Blecha, Laura, Blumer, Harsha, Brazier, Adam, Brook, Paul R., Burke-Spolaor, Sarah, Burnette, Rand, Case, Robin, Casey-Clyde, J. Andrew, Charisi, Maria, Chatterjee, Shami, Cohen, Tyler, Cordes, James M., Cornish, Neil J., Crawford, Fronefield, Cromartie, H. Thankful, DeCesar, Megan E., DeGan, Dallas, Demorest, Paul B., Dolch, Timothy, Drachler, Brendan, Ellis, Justin A., Ferdman, Robert D., Ferrara, Elizabeth C., Fiore, William, Fonseca, Emmanuel, Freedman, Gabriel E., Garver-Daniels, Nate, Gentile, Peter A., Glaser, Joseph, Good, Deborah C., Gültekin, Kayhan, Hazboun, Jeffrey S., Jennings, Ross J., Johnson, Aaron D., Jones, Megan L., Kaiser, Andrew R., Kaplan, David L., Kelley, Luke Zoltan, Key, Joey S., Laal, Nima, Lam, Michael T., Lamb, William G., Lazio, T. Joseph W., Lewandowska, Natalia, Liu, Tingting, Lorimer, Duncan R., Luo, Jing, Lynch, Ryan S., Ma, Chung-Pei, Madison, Dustin R., McEwen, Alexander, McKee, James W., McLaughlin, Maura A., Meyers, Patrick M., Mingarelli, Chiara M. F., Mitridate, Andrea, Ng, Cherry, Nice, David J., Ocker, Stella Koch, Olum, Ken D., Pennucci, Timothy T., Pol, Nihan S., Ransom, Scott M., Ray, Paul S., Romano, Joseph D., Sardesai, Shashwat C., Schmitz, Kai, Siemens, Xavier, Simon, Joseph, Siwek, Magdalena S., Fiscella, Sophia V. Sosa, Spiewak, Renée, Stairs, Ingrid H., Stinebring, Daniel R., Stovall, Kevin, Sun, Jerry P., Swiggum, Joseph K., Taylor, Jacob, Taylor, Stephen R., Turner, Jacob E., Unal, Caner, Vallisneri, Michele, Vigeland, Sarah J., Wahl, Haley M., Witt, Caitlin A., and Young, Olivia

Subjects
General Relativity and Quantum Cosmology, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present the results of a Bayesian search for gravitational wave (GW) memory in the NANOGrav 12.5-yr data set. We find no convincing evidence for any gravitational wave memory signals in this data set (Bayes factor = 2.8). As such, we go on to place upper limits on the strain amplitude of GW memory events as a function of sky location and event epoch. These upper limits are computed using a signal model that assumes the existence of a common, spatially uncorrelated red noise in addition to a GW memory signal. The median strain upper limit as a function of sky position is approximately $3.3 \times 10^{-14}$. We also find that there are some differences in the upper limits as a function of sky position centered around PSR J0613$-$0200. This suggests that this pulsar has some excess noise which can be confounded with GW memory. Finally, the upper limits as a function of burst epoch continue to improve at later epochs. This improvement is attributable to the continued growth of the pulsar timing array., Comment: 29 pages, 5 figures

Published
2023

4. The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background

Author

Agazie, Gabriella, Anumarlapudi, Akash, Archibald, Anne M., Baker, Paul T., Bécsy, Bence, Blecha, Laura, Bonilla, Alexander, Brazier, Adam, Brook, Paul R., Burke-Spolaor, Sarah, Burnette, Rand, Case, Robin, Casey-Clyde, J. Andrew, Charisi, Maria, Chatterjee, Shami, Chatziioannou, Katerina, Cheeseboro, Belinda D., Chen, Siyuan, Cohen, Tyler, Cordes, James M., Cornish, Neil J., Crawford, Fronefield, Cromartie, H. Thankful, Crowter, Kathryn, Cutler, Curt J., D'Orazio, Daniel J., DeCesar, Megan E., DeGan, Dallas, Demorest, Paul B., Deng, Heling, Dolch, Timothy, Drachler, Brendan, Ferrara, Elizabeth C., Fiore, William, Fonseca, Emmanuel, Freedman, Gabriel E., Gardiner, Emiko, Garver-Daniels, Nate, Gentile, Peter A., Gersbach, Kyle A., Glaser, Joseph, Good, Deborah C., Gültekin, Kayhan, Hazboun, Jeffrey S., Hourihane, Sophie, Islo, Kristina, Jennings, Ross J., Johnson, Aaron, Jones, Megan L., Kaiser, Andrew R., Kaplan, David L., Kelley, Luke Zoltan, Kerr, Matthew, Key, Joey S., Laal, Nima, Lam, Michael T., Lamb, William G., Lazio, T. Joseph W., Lewandowska, Natalia, Littenberg, Tyson B., Liu, Tingting, Luo, Jing, Lynch, Ryan S., Ma, Chung-Pei, Madison, Dustin R., McEwen, Alexander, McKee, James W., McLaughlin, Maura A., McMann, Natasha, Meyers, Bradley W., Meyers, Patrick M., Mingarelli, Chiara M. F., Mitridate, Andrea, Natarajan, Priyamvada, Ng, Cherry, Nice, David J., Ocker, Stella Koch, Olum, Ken D., Pennucci, Timothy T., Perera, Benetge B. P., Petrov, Polina, Pol, Nihan S., Radovan, Henri A., Ransom, Scott M., Ray, Paul S., Romano, Joseph D., Runnoe, Jessie C., Sardesai, Shashwat C., Schmiedekamp, Ann, Schmiedekamp, Carl, Schmitz, Kai, Schult, Levi, Shapiro-Albert, Brent J., Siemens, Xavier, Simon, Joseph, Siwek, Magdalena S., Stairs, Ingrid H., Stinebring, Daniel R., Stovall, Kevin, Sun, Jerry P., Susobhanan, Abhimanyu, Swiggum, Joseph K., Taylor, Jacob, Taylor, Stephen R., Turner, Jacob E., Unal, Caner, Vallisneri, Michele, Vigeland, Sarah J., Wachter, Jeremy M., Wahl, Haley M., Wang, Qiaohong, Witt, Caitlin A., Wright, David, and Young, Olivia

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology
Abstract

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 gravitational waves, here we analyze the signal as coming from a population of supermassive black hole (SMBH) binaries distributed throughout the Universe. We show that astrophysically motivated models of SMBH binary populations are able to reproduce both the amplitude and shape of the observed low-frequency gravitational-wave spectrum. While multiple model variations are able to reproduce the GWB spectrum at our current measurement precision, our results highlight the importance of accurately modeling binary evolution for producing realistic GWB spectra. Additionally, while reasonable parameters are able to reproduce the 15-year observations, the implied GWB amplitude necessitates either a large number of parameters to be at the edges of expected values, or a small number of parameters to be notably different from standard expectations. While we are not yet able to definitively establish the origin of the inferred GWB signal, the consistency of the signal with astrophysical expectations offers a tantalizing prospect for confirming that SMBH binaries are able to form, reach sub-parsec separations, and eventually coalesce. As the significance grows over time, higher-order features of the GWB spectrum will definitively determine the nature of the GWB and allow for novel constraints on SMBH populations., Comment: Accepted by Astrophysical Journal Letters as part of Focus on NANOGrav's 15-year Data Set and the Gravitational Wave Background. For questions or comments, please email comments@nanograv.org. Edited to fix two equation typos (Eq.13 & 21), and minor text typos

Published
2023
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5. The NANOGrav 15-year Data Set: Search for Signals from New Physics

Author

Afzal, Adeela, Agazie, Gabriella, Anumarlapudi, Akash, Archibald, Anne M., Arzoumanian, Zaven, Baker, Paul T., Bécsy, Bence, Blanco-Pillado, Jose Juan, Blecha, Laura, Boddy, Kimberly K., Brazier, Adam, Brook, Paul R., Burke-Spolaor, Sarah, Burnette, Rand, Case, Robin, Charisi, Maria, Chatterjee, Shami, Chatziioannou, Katerina, Cheeseboro, Belinda D., Chen, Siyuan, Cohen, Tyler, Cordes, James M., Cornish, Neil J., Crawford, Fronefield, Cromartie, H. Thankful, Crowter, Kathryn, Cutler, Curt J., DeCesar, Megan E., DeGan, Dallas, Demorest, Paul B., Deng, Heling, Dolch, Timothy, Drachler, Brendan, von Eckardstein, Richard, Ferrara, Elizabeth C., Fiore, William, Fonseca, Emmanuel, Freedman, Gabriel E., Garver-Daniels, Nate, Gentile, Peter A., Gersbach, Kyle A., Glaser, Joseph, Good, Deborah C., Guertin, Lydia, Gültekin, Kayhan, Hazboun, Jeffrey S., Hourihane, Sophie, Islo, Kristina, Jennings, Ross J., Johnson, Aaron D., Jones, Megan L., Kaiser, Andrew R., Kaplan, David L., Kelley, Luke Zoltan, Kerr, Matthew, Key, Joey S., Laal, Nima, Lam, Michael T., Lamb, William G., Lazio, T. Joseph W., Lee, Vincent S. H., Lewandowska, Natalia, Santos, Rafael R. Lino dos, Littenberg, Tyson B., Liu, Tingting, Lorimer, Duncan R., Luo, Jing, Lynch, Ryan S., Ma, Chung-Pei, Madison, Dustin R., McEwen, Alexander, McKee, James W., McLaughlin, Maura A., McMann, Natasha, Meyers, Bradley W., Meyers, Patrick M., Mingarelli, Chiara M. F., Mitridate, Andrea, Nay, Jonathan, Natarajan, Priyamvada, Ng, Cherry, Nice, David J., Ocker, Stella Koch, Olum, Ken D., Pennucci, Timothy T., Perera, Benetge B. P., Petrov, Polina, Pol, Nihan S., Radovan, Henri A., Ransom, Scott M., Ray, Paul S., Romano, Joseph D., Sardesai, Shashwat C., Schmiedekamp, Ann, Schmiedekamp, Carl, Schmitz, Kai, Schröder, Tobias, Schult, Levi, Shapiro-Albert, Brent J., Siemens, Xavier, Simon, Joseph, Siwek, Magdalena S., Stairs, Ingrid H., Stinebring, Daniel R., Stovall, Kevin, Stratmann, Peter, Sun, Jerry P., Susobhanan, Abhimanyu, Swiggum, Joseph K., Taylor, Jacob, Taylor, Stephen R., Trickle, Tanner, Turner, Jacob E., Unal, Caner, Vallisneri, Michele, Verma, Sonali, Vigeland, Sarah J., Wahl, Haley M., Wang, Qiaohong, Witt, Caitlin A., Wright, David, Young, Olivia, and Zurek, Kathryn M.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology
Abstract

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-frequency gravitational-wave (GW) background. In this paper, we investigate potential cosmological interpretations of this signal, specifically cosmic inflation, scalar-induced GWs, first-order phase transitions, cosmic strings, and domain walls. We find that, with the exception of stable cosmic strings of field theory origin, all these models can reproduce the observed signal. When compared to the standard interpretation in terms of inspiraling supermassive black hole binaries (SMBHBs), many cosmological models seem to provide a better fit resulting in Bayes factors in the range from 10 to 100. However, these results strongly depend on modeling assumptions about the cosmic SMBHB population and, at this stage, should not be regarded as evidence for new physics. Furthermore, we identify excluded parameter regions where the predicted GW signal from cosmological sources significantly exceeds the NANOGrav signal. These parameter constraints are independent of the origin of the NANOGrav signal and illustrate how pulsar timing data provide a new way to constrain the parameter space of these models. Finally, we search for deterministic signals produced by models of ultralight dark matter (ULDM) and dark matter substructures in the Milky Way. We find no evidence for either of these signals and thus report updated constraints on these models. In the case of ULDM, these constraints outperform torsion balance and atomic clock constraints for ULDM coupled to electrons, muons, or gluons., Comment: 74 pages, 31 figures, 4 tables; published in Astrophysical Journal Letters as part of Focus on NANOGrav's 15-year Data Set and the Gravitational Wave Background. For questions or comments, please email comments@nanograv.org

Published
2023
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6. The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background

Author

Agazie, Gabriella, Anumarlapudi, Akash, Archibald, Anne M., Arzoumanian, Zaven, Baker, Paul T., Becsy, Bence, Blecha, Laura, Brazier, Adam, Brook, Paul R., Burke-Spolaor, Sarah, Burnette, Rand, Case, Robin, Charisi, Maria, Chatterjee, Shami, Chatziioannou, Katerina, Cheeseboro, Belinda D., Chen, Siyuan, Cohen, Tyler, Cordes, James M., Cornish, Neil J., Crawford, Fronefield, Cromartie, H. Thankful, Crowter, Kathryn, Cutler, Curt J., DeCesar, Megan E., DeGan, Dallas, Demorest, Paul B., Deng, Heling, Dolch, Timothy, Drachler, Brendan, Ellis, Justin A., Ferrara, Elizabeth C., Fiore, William, Fonseca, Emmanuel, Freedman, Gabriel E., Garver-Daniels, Nate, Gentile, Peter A., Gersbach, Kyle A., Glaser, Joseph, Good, Deborah C., Gultekin, Kayhan, Hazboun, Jeffrey S., Hourihane, Sophie, Islo, Kristina, Jennings, Ross J., Johnson, Aaron D., Jones, Megan L., Kaiser, Andrew R., Kaplan, David L., Kelley, Luke Zoltan, Kerr, Matthew, Key, Joey S., Klein, Tonia C., Laal, Nima, Lam, Michael T., Lamb, William G., Lazio, T. Joseph W., Lewandowska, Natalia, Littenberg, Tyson B., Liu, Tingting, Lommen, Andrea, Lorimer, Duncan R., Luo, Jing, Lynch, Ryan S., Ma, Chung-Pei, Madison, Dustin R., Mattson, Margaret A., McEwen, Alexander, McKee, James W., McLaughlin, Maura A., McMann, Natasha, Meyers, Bradley W., Meyers, Patrick M., Mingarelli, Chiara M. F., Mitridate, Andrea, Natarajan, Priyamvada, Ng, Cherry, Nice, David J., Ocker, Stella Koch, Olum, Ken D., Pennucci, Timothy T., Perera, Benetge B. P., Petrov, Polina, Pol, Nihan S., Radovan, Henri A., Ransom, Scott M., Ray, Paul S., Romano, Joseph D., Sardesai, Shashwat C., Schmiedekamp, Ann, Schmiedekamp, Carl, Schmitz, Kai, Schult, Levi, Shapiro-Albert, Brent J., Siemens, Xavier, Simon, Joseph, Siwek, Magdalena S., Stairs, Ingrid H., Stinebring, Daniel R., Stovall, Kevin, Sun, Jerry P., Susobhanan, Abhimanyu, Swiggum, Joseph K., Taylor, Jacob, Taylor, Stephen R., Turner, Jacob E., Unal, Caner, Vallisneri, Michele, van Haasteren, Rutger, Vigeland, Sarah J., Wahl, Haley M., Wang, Qiaohong, Witt, Caitlin A., and Young, Olivia

Subjects
Astrophysics - High Energy Astrophysical Phenomena, General Relativity and Quantum Cosmology
Abstract

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 Observatory for Gravitational Waves. The correlations follow the Hellings-Downs pattern expected for a stochastic gravitational-wave background. The presence of such a gravitational-wave background with a power-law-spectrum is favored over a model with only independent pulsar noises with a Bayes factor in excess of $10^{14}$, and this same model is favored over an uncorrelated common power-law-spectrum model with Bayes factors of 200-1000, depending on spectral modeling choices. We have built a statistical background distribution for these latter Bayes factors using a method that removes inter-pulsar correlations from our data set, finding $p = 10^{-3}$ (approx. $3\sigma$) for the observed Bayes factors in the null no-correlation scenario. A frequentist test statistic built directly as a weighted sum of inter-pulsar correlations yields $p = 5 \times 10^{-5} - 1.9 \times 10^{-4}$ (approx. $3.5 - 4\sigma$). Assuming a fiducial $f^{-2/3}$ characteristic-strain spectrum, as appropriate for an ensemble of binary supermassive black-hole inspirals, the strain amplitude is $2.4^{+0.7}_{-0.6} \times 10^{-15}$ (median + 90% credible interval) at a reference frequency of 1/(1 yr). The inferred gravitational-wave background amplitude and spectrum are consistent with astrophysical expectations for a signal from a population of supermassive black-hole binaries, although more exotic cosmological and astrophysical sources cannot be excluded. The observation of Hellings-Downs correlations points to the gravitational-wave origin of this signal., Comment: 30 pages, 18 figures. Published in Astrophysical Journal Letters as part of Focus on NANOGrav's 15-year Data Set and the Gravitational Wave Background. For questions or comments, please email comments@nanograv.org

Published
2023
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7. The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background

Author

Agazie, Gabriella, primary, Anumarlapudi, Akash, additional, Archibald, Anne M., additional, Baker, Paul T., additional, Bécsy, Bence, additional, Blecha, Laura, additional, Bonilla, Alexander, additional, Brazier, Adam, additional, Brook, Paul R., additional, Burke-Spolaor, Sarah, additional, Burnette, Rand, additional, Case, Robin, additional, Casey-Clyde, J. Andrew, additional, Charisi, Maria, additional, Chatterjee, Shami, additional, Chatziioannou, Katerina, additional, Cheeseboro, Belinda D., additional, Chen, Siyuan, additional, Cohen, Tyler, additional, Cordes, James M., additional, Cornish, Neil J., additional, Crawford, Fronefield, additional, Cromartie, H. Thankful, additional, Crowter, Kathryn, additional, Cutler, Curt J., additional, D’Orazio, Daniel J., additional, DeCesar, Megan E., additional, DeGan, Dallas, additional, Demorest, Paul B., additional, Deng, Heling, additional, Dolch, Timothy, additional, Drachler, Brendan, additional, Ferrara, Elizabeth C., additional, Fiore, William, additional, Fonseca, Emmanuel, additional, Freedman, Gabriel E., additional, Gardiner, Emiko, additional, Garver-Daniels, Nate, additional, Gentile, Peter A., additional, Gersbach, Kyle A., additional, Glaser, Joseph, additional, Good, Deborah C., additional, Gültekin, Kayhan, additional, Hazboun, Jeffrey S., additional, Hourihane, Sophie, additional, Islo, Kristina, additional, Jennings, Ross J., additional, Johnson, Aaron, additional, Jones, Megan L., additional, Kaiser, Andrew R., additional, Kaplan, David L., additional, Kelley, Luke Zoltan, additional, Kerr, Matthew, additional, Key, Joey S., additional, Laal, Nima, additional, Lam, Michael T., additional, Lamb, William G., additional, W. Lazio, T. Joseph, additional, Lewandowska, Natalia, additional, Littenberg, Tyson B., additional, Liu, Tingting, additional, Luo, Jing, additional, Lynch, Ryan S., additional, Ma, Chung-Pei, additional, Madison, Dustin R., additional, McEwen, Alexander, additional, McKee, James W., additional, McLaughlin, Maura A., additional, McMann, Natasha, additional, Meyers, Bradley W., additional, Meyers, Patrick M., additional, Mingarelli, Chiara M. F., additional, Mitridate, Andrea, additional, Natarajan, Priyamvada, additional, Ng, Cherry, additional, Nice, David J., additional, Ocker, Stella Koch, additional, Olum, Ken D., additional, Pennucci, Timothy T., additional, Perera, Benetge B. P., additional, Petrov, Polina, additional, Pol, Nihan S., additional, Radovan, Henri A., additional, Ransom, Scott M., additional, Ray, Paul S., additional, Romano, Joseph D., additional, Runnoe, Jessie C., additional, Sardesai, Shashwat C., additional, Schmiedekamp, Ann, additional, Schmiedekamp, Carl, additional, Schmitz, Kai, additional, Schult, Levi, additional, Shapiro-Albert, Brent J., additional, Siemens, Xavier, additional, Simon, Joseph, additional, Siwek, Magdalena S., additional, Stairs, Ingrid H., additional, Stinebring, Daniel R., additional, Stovall, Kevin, additional, Sun, Jerry P., additional, Susobhanan, Abhimanyu, additional, Swiggum, Joseph K., additional, Taylor, Jacob, additional, Taylor, Stephen R., additional, Turner, Jacob E., additional, Unal, Caner, additional, Vallisneri, Michele, additional, Vigeland, Sarah J., additional, Wachter, Jeremy M., additional, Wahl, Haley M., additional, Wang, Qiaohong, additional, Witt, Caitlin A., additional, Wright, David, additional, and Young, Olivia, additional

Published
2023
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8. Editor's Page

Author

Stewart, Jim, Arnold, Douglas M., Burnette, Rand, Doan, Ruth Alden, Ferguson, Robert, Friedman, Bernard, Hoffman, Ronald, Horton, Lois E., Judd, Jacob, Kornblith, Gary, Lasser, Carol, Marcus, Maeva, Murrin, John, Oberg, Barbara, Pease, William, Pole, J. R., Richter, Daniel K., Roper, Donald M., Skemp, Sheila, and Sweet, Morris L.

Published
2004

9. The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background

Author

Agazie, Gabriella, primary, Anumarlapudi, Akash, additional, Archibald, Anne M., additional, Arzoumanian, Zaven, additional, Baker, Paul T., additional, Bécsy, Bence, additional, Blecha, Laura, additional, Brazier, Adam, additional, Brook, Paul R., additional, Burke-Spolaor, Sarah, additional, Burnette, Rand, additional, Case, Robin, additional, Charisi, Maria, additional, Chatterjee, Shami, additional, Chatziioannou, Katerina, additional, Cheeseboro, Belinda D., additional, Chen, Siyuan, additional, Cohen, Tyler, additional, Cordes, James M., additional, Cornish, Neil J., additional, Crawford, Fronefield, additional, Cromartie, H. Thankful, additional, Crowter, Kathryn, additional, Cutler, Curt J., additional, DeCesar, Megan E., additional, DeGan, Dallas, additional, Demorest, Paul B., additional, Deng, Heling, additional, Dolch, Timothy, additional, Drachler, Brendan, additional, Ellis, Justin A., additional, Ferrara, Elizabeth C., additional, Fiore, William, additional, Fonseca, Emmanuel, additional, Freedman, Gabriel E., additional, Garver-Daniels, Nate, additional, Gentile, Peter A., additional, Gersbach, Kyle A., additional, Glaser, Joseph, additional, Good, Deborah C., additional, Gültekin, Kayhan, additional, Hazboun, Jeffrey S., additional, Hourihane, Sophie, additional, Islo, Kristina, additional, Jennings, Ross J., additional, Johnson, Aaron D., additional, Jones, Megan L., additional, Kaiser, Andrew R., additional, Kaplan, David L., additional, Kelley, Luke Zoltan, additional, Kerr, Matthew, additional, Key, Joey S., additional, Klein, Tonia C., additional, Laal, Nima, additional, Lam, Michael T., additional, Lamb, William G., additional, W. Lazio, T. Joseph, additional, Lewandowska, Natalia, additional, Littenberg, Tyson B., additional, Liu, Tingting, additional, Lommen, Andrea, additional, Lorimer, Duncan R., additional, Luo, Jing, additional, Lynch, Ryan S., additional, Ma, Chung-Pei, additional, Madison, Dustin R., additional, Mattson, Margaret A., additional, McEwen, Alexander, additional, McKee, James W., additional, McLaughlin, Maura A., additional, McMann, Natasha, additional, Meyers, Bradley W., additional, Meyers, Patrick M., additional, Mingarelli, Chiara M. F., additional, Mitridate, Andrea, additional, Natarajan, Priyamvada, additional, Ng, Cherry, additional, Nice, David J., additional, Ocker, Stella Koch, additional, Olum, Ken D., additional, Pennucci, Timothy T., additional, Perera, Benetge B. P., additional, Petrov, Polina, additional, Pol, Nihan S., additional, Radovan, Henri A., additional, Ransom, Scott M., additional, Ray, Paul S., additional, Romano, Joseph D., additional, Sardesai, Shashwat C., additional, Schmiedekamp, Ann, additional, Schmiedekamp, Carl, additional, Schmitz, Kai, additional, Schult, Levi, additional, Shapiro-Albert, Brent J., additional, Siemens, Xavier, additional, Simon, Joseph, additional, Siwek, Magdalena S., additional, Stairs, Ingrid H., additional, Stinebring, Daniel R., additional, Stovall, Kevin, additional, Sun, Jerry P., additional, Susobhanan, Abhimanyu, additional, Swiggum, Joseph K., additional, Taylor, Jacob, additional, Taylor, Stephen R., additional, Turner, Jacob E., additional, Unal, Caner, additional, Vallisneri, Michele, additional, van Haasteren, Rutger, additional, Vigeland, Sarah J., additional, Wahl, Haley M., additional, Wang, Qiaohong, additional, Witt, Caitlin A., additional, and Young, Olivia, additional

Published
2023
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10. The NANOGrav 15 yr Data Set: Search for Signals from New Physics

Author

Afzal, Adeela, primary, Agazie, Gabriella, additional, Anumarlapudi, Akash, additional, Archibald, Anne M., additional, Arzoumanian, Zaven, additional, Baker, Paul T., additional, Bécsy, Bence, additional, Blanco-Pillado, Jose Juan, additional, Blecha, Laura, additional, Boddy, Kimberly K., additional, Brazier, Adam, additional, Brook, Paul R., additional, Burke-Spolaor, Sarah, additional, Burnette, Rand, additional, Case, Robin, additional, Charisi, Maria, additional, Chatterjee, Shami, additional, Chatziioannou, Katerina, additional, Cheeseboro, Belinda D., additional, Chen, Siyuan, additional, Cohen, Tyler, additional, Cordes, James M., additional, Cornish, Neil J., additional, Crawford, Fronefield, additional, Cromartie, H. Thankful, additional, Crowter, Kathryn, additional, Cutler, Curt J., additional, DeCesar, Megan E., additional, DeGan, Dallas, additional, Demorest, Paul B., additional, Deng, Heling, additional, Dolch, Timothy, additional, Drachler, Brendan, additional, von Eckardstein, Richard, additional, Ferrara, Elizabeth C., additional, Fiore, William, additional, Fonseca, Emmanuel, additional, Freedman, Gabriel E., additional, Garver-Daniels, Nate, additional, Gentile, Peter A., additional, Gersbach, Kyle A., additional, Glaser, Joseph, additional, Good, Deborah C., additional, Guertin, Lydia, additional, Gültekin, Kayhan, additional, Hazboun, Jeffrey S., additional, Hourihane, Sophie, additional, Islo, Kristina, additional, Jennings, Ross J., additional, Johnson, Aaron D., additional, Jones, Megan L., additional, Kaiser, Andrew R., additional, Kaplan, David L., additional, Kelley, Luke Zoltan, additional, Kerr, Matthew, additional, Key, Joey S., additional, Laal, Nima, additional, Lam, Michael T., additional, Lamb, William G., additional, W. Lazio, T. Joseph, additional, Lee, Vincent S. H., additional, Lewandowska, Natalia, additional, Lino dos Santos, Rafael R., additional, Littenberg, Tyson B., additional, Liu, Tingting, additional, Lorimer, Duncan R., additional, Luo, Jing, additional, Lynch, Ryan S., additional, Ma, Chung-Pei, additional, Madison, Dustin R., additional, McEwen, Alexander, additional, McKee, James W., additional, McLaughlin, Maura A., additional, McMann, Natasha, additional, Meyers, Bradley W., additional, Meyers, Patrick M., additional, Mingarelli, Chiara M. F., additional, Mitridate, Andrea, additional, Nay, Jonathan, additional, Natarajan, Priyamvada, additional, Ng, Cherry, additional, Nice, David J., additional, Ocker, Stella Koch, additional, Olum, Ken D., additional, Pennucci, Timothy T., additional, Perera, Benetge B. P., additional, Petrov, Polina, additional, Pol, Nihan S., additional, Radovan, Henri A., additional, Ransom, Scott M., additional, Ray, Paul S., additional, Romano, Joseph D., additional, Sardesai, Shashwat C., additional, Schmiedekamp, Ann, additional, Schmiedekamp, Carl, additional, Schmitz, Kai, additional, Schröder, Tobias, additional, Schult, Levi, additional, Shapiro-Albert, Brent J., additional, Siemens, Xavier, additional, Simon, Joseph, additional, Siwek, Magdalena S., additional, Stairs, Ingrid H., additional, Stinebring, Daniel R., additional, Stovall, Kevin, additional, Stratmann, Peter, additional, Sun, Jerry P., additional, Susobhanan, Abhimanyu, additional, Swiggum, Joseph K., additional, Taylor, Jacob, additional, Taylor, Stephen R., additional, Trickle, Tanner, additional, Turner, Jacob E., additional, Unal, Caner, additional, Vallisneri, Michele, additional, Verma, Sonali, additional, Vigeland, Sarah J., additional, Wahl, Haley M., additional, Wang, Qiaohong, additional, Witt, Caitlin A., additional, Wright, David, additional, Young, Olivia, additional, and Zurek, Kathryn M., additional

Published
2023
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15. Prince Henry 'the Navigator': A life

Author

BURNETTE, RAND

Subjects
Prince Henry 'the Navigator': A Life (Book), Books -- Book reviews, Humanities, Literature/writing
Abstract

Peter Russell, Prince Henry 'the Navigator': A Life New Haven and London: Yale University Press, 2000. xvi + 448 pp. $35. ISBN: 0-300-08233-9. Peter Russell's Prince Henry is a major [...]

Published
2001

16. The Cambridge Illustrated Atlas of Warfare: Renaissance to Revolution, 1492-1792

Author

Burnette, Rand

Subjects
The Cambridge Illustrated Atlas of Warfare: Renaissance to Revolution 1492-1792 (Book), Books -- Book reviews, Humanities, Literature/writing
Abstract

Jeremy Black has written an excellent reference work that covers warfare from the Renaissance (at least from 1492) to 1792. His scope is worldwide, including sections on China, Japan, India, [...]

Published
1998

22. William H. DeMotte: Witness to Lincoln's Murder.

Author

Burnette, Rand

Subjects
PRESIDENTS of the United States, MURDER
Abstract

The article relates how William H. DeMotte, agent of the Indiana Sanitary Commission, witnessed the murder of then U.S. President Abraham Lincoln. After he, Tom Taylor and two other co-employees heard that the president and General Ulysses S. Grant will be watching the play at Ford's Theatre on April 14, 1865, they decided to purchase tickets to the play to see them. It was on the third act of the play, when actor Henry Hawk delivered funny lines, that the incident happened. The shooter was identified as actor Wilkes Booth.

Published
2012

23. Jacksonville's William H. DeMotte.

Author

Burnette, Rand

Subjects
COLLEGE presidents, INDIANA Asbury University (Greencastle, Ind.), ASSASSINATION of Abraham Lincoln, 1865, TEACHERS of the deaf
Abstract

A biography of William H. DeMotte, former teacher of the deaf and former college president, is presented. He was born in Cove Spring, Kentucky, in 1830. He graduated from Indiana Asbury University in 1849. During the U.S. Civil War he served as Agent of the Indiana Sanitary Commission, and was present at Ford's Theatre in Washington, D.C., on April 14, 1865, when U.S. president Abraham Lincoln was assassinated. He became president of Illinois Female College in 1868. He died on January 2, 1910.

Published
2011

25. Book reviews.

Author

Burnette, Rand

Subjects
JOURNALS of Two Travellers in Elizabethan & Early Stuart England, The (Book)
Abstract

Reviews the book, `The Journals of Two Travellers in Elizabethan and Early Stuart England,' written by Thomas Platter and Horatio Busino, edited by Peter Razzell.

Published
1997

27. A Community Built on Words (Book).

Author

Burnette, Rand

Subjects
HISTORY of the United States Constitution, NONFICTION
Abstract

Reviews the non-fiction book 'A Community Built on Words: The Constitution in History and Politics,' by H. Jefferson Powell.

Published
2003
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28. The edge of empire.

Author

Burnette, Rand

Subjects
HISTORY of colonization, NONFICTION
Published
2017

30. Ferreting history.

Author

Burnette, Rand

Subjects
UNDERGROUND Railroad (U.S. history), NONFICTION
Abstract

The article reviews the book "The Underground Ralroad in Western Illinois," by Owen W. Muelder.

Published
2009

32. Reviews.

Author

Burnette, Rand

Subjects
CAMBRIDGE Illustrated Atlas of Warfare: Renaissance to Revolution 1492-1792, The (Book)
Abstract

Reviews the book `The Cambridge Illustrated Atlas of Warfare: Renaissance to Revolution, 1492-1792,' by Jeremy Black.

Published
1998

33. Reviews.

Author

Burnette, Rand

Subjects
MODEL Houses for Model Families (Book)
Abstract

Reviews the book `Model Houses for Model Families. Gender, Ideology and the Modern Dwelling. The Type-Planned Houses of the 1940s in Finland,' by Kirsi Saarikangas.

Published
1994
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