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331 results on '"Baker, J. G."'

1. Chasing Super-Massive Black Hole merging events with $Athena$ and LISA

Author

Piro, L., Colpi, M., Aird, J., Mangiagli, A., Fabian, A. C., Guainazzi, M., Marsat, S., Sesana, A., McNamara, P., Bonetti, M., Rossi, E. M., Tanvir, N. R., Baker, J. G., Belanger, G., Canton, T. Dal, Jennrich, O., Katz, M. L., and Luetzgendorf, N.

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

The European Space Agency is studying two large-class missions bound to operate in the decade of the 30s, and aiming at investigating the most energetic and violent phenomena in the Universe. $Athena$ is poised to study the physical conditions of baryons locked in large-scale structures from the epoch of their formation, as well as to yield an accurate census of accreting super-massive black holes down to the epoch of reionization; LISA will extend the hunt for Gravitational Wave (GW) events to the hitherto unexplored mHz regime. We discuss in this paper the science that their concurrent operation could yield, and present possible $Athena$ observational strategies. We focus on Super-Massive (M$\lesssim10^7\rm M_{\odot}$) Black Hole Mergers (SMBHMs), potentially accessible to $Athena$ up to $z\sim2$. The simultaneous measurement of their electro-magnetic (EM) and GW signals may enable unique experiments in the domains of astrophysics, fundamental physics, and cosmography, such as the magneto-hydrodynamics of fluid flows in a rapidly variable space-time, the formation of coronae and jets in Active Galactic Nuclei, and the measurement of the speed of GW, among others. Key to achieve these breakthrough results will be the LISA capability of locating a SMBHM event with an error box comparable to, or better than the field-of-view of the $Athena$ Wide Field Imager ($\simeq0.4\,$deg$^2$) and $Athena$ capability to slew fast to detect the source during the inspiral phase and the post-merger phase. Together, the two observatories will open in principle the exciting possibility of truly concurrent EM and GW studies of the SMBHMs, Comment: 17 pages, 8 figures. Accepted for publication in MNRAS

Published
2022
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2. Growth of supermassive black holes, galaxy mergers and supermassive binary black holes

Author

Komossa, S., Baker, J. G., and Liu, F. K.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology
Abstract

The study of galaxy mergers and supermassive binary black holes (SMBBHs) is central to our understanding of the galaxy and black hole assembly and (co-)evolution at the epoch of structure formation and throughout cosmic history. Galaxy mergers are the sites of major accretion episodes, they power quasars, grow supermassive black holes (SMBHs), and drive SMBH-host scaling relations. The coalescing SMBBHs at their centers are the loudest sources of gravitational waves (GWs) in the universe, and the subsequent GW recoil has a variety of potential astrophysical implications which are still under exploration. Future GW astronomy will open a completely new window on structure formation and galaxy mergers, including the direct detection of coalescing SMBBHs, high-precision measurements of their masses and spins, and constraints on BH formation and evolution in the high-redshift universe., Comment: To appear in "Astronomy in Focus", proceedings of the XXIXth IAU General Assembly, P. Benvenuti (ed). Contribution to Focus Meeting FM 14 (The Gravitational Wave Symphony of Structure Formation); first submitted Oct. 2015

Published
2016

3. LISA parameter estimation using numerical merger waveforms

Author

Thorpe, J. I., McWilliams, S. T., Kelly, B. J., Fahey, R. P., Arnaud, K., and Baker, J. G.

Subjects
Astrophysics
Abstract

Recent advances in numerical relativity provide a detailed description of the waveforms of coalescing massive black hole binaries (MBHBs), expected to be the strongest detectable LISA sources. We present a preliminary study of LISA's sensitivity to MBHB parameters using a hybrid numerical/analytic waveform for equal-mass, non-spinning holes. The Synthetic LISA software package is used to simulate the instrument response and the Fisher information matrix method is used to estimate errors in the parameters. Initial results indicate that inclusion of the merger signal can significantly improve the precision of some parameter estimates. For example, the median parameter errors for an ensemble of systems with total redshifted mass of one million Solar masses at a redshift of one were found to decrease by a factor of slightly more than two for signals with merger as compared to signals truncated at the Schwarzchild ISCO., Comment: Submitted to Classical and Quantum Gravity for 7th International LISA Symposium Proceedings v2: Minor changes in response to referee comments

Published
2008
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4. An overview of the second round of the Mock LISA Data Challenges

Author

Arnaud, K A, Babak, S, Baker, J G, Benacquista, M J, Cornish, N J, Cutler, C, Finn, L S, Larson, S L, Littenberg, T, Porter, E K, Vallisneri, M, Vecchio, A, and Vinet, J-Y

Subjects
General Relativity and Quantum Cosmology
Abstract

The Mock Data Challenges (MLDCs) have the dual purpose of fostering the development of LISA data-analysis tools and capabilities and of demonstrating the technical readiness already achieved by the gravitational-wave community in distilling a rich science payoff from the LISA data. The first round of MLDCs has just been completed and the second-round data sets are being released shortly after this workshop. The second-round data sets contain radiation from an entire Galactic population of stellar-mass binary systems, from massive--black-hole binaries, and from extreme--mass-ratio inspirals. These data sets are designed to capture much of the complexity that is expected in the actual LISA data, and should provide a fairly realistic setting to test advanced data-analysis techniques, and in particular the global aspect of the analysis. Here we describe the second round of MLDCs and provide details about its implementation., Comment: Proceedings of GWDAW-11. Corrected Challenge 2 definition (esp. Table 1), definition of polarization tensors in simulators, definition of polarization angle in EMRIs

Published
2007
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5. A How-To for the Mock LISA Data Challenges

Author

Arnaud, K. A., Babak, S., Baker, J. G., Benacquista, M. J., Cornish, N. J., Cutler, C., Larson, S. L., Sathyaprakash, B. S., Vallisneri, M., Vecchio, A., and Vinet, J-Y.

Subjects
General Relativity and Quantum Cosmology
Abstract

The LISA International Science Team Working Group on Data Analysis (LIST-WG1B) is sponsoring several rounds of mock data challenges, with the purpose of fostering development of LISA data-analysis capabilities, and of demonstrating technical readiness for the maximum science exploitation of the LISA data. The first round of challenge data sets were released at this Symposium. We describe the models and conventions (for LISA and for gravitational-wave sources) used to prepare the data sets, the file format used to encode them, and the tools and resources available to support challenge participants., Comment: 10 pages, 1 figure, in Proceedings of the Sixth International LISA Symposium (AIP, 2006)

Published
2006
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6. The Mock LISA Data Challenges: An overview

Author

Arnaud, K. A., Babak, S., Baker, J. G., Benacquista, M. J., Cornish, N. J., Cutler, C., Larson, S. L., Sathyaprakash, B. S., Vallisneri, M., Vecchio, A., and Vinet, J-Y.

Subjects
General Relativity and Quantum Cosmology
Abstract

The LISA International Science Team Working Group on Data Analysis (LIST-WG1B) is sponsoring several rounds of mock data challenges, with the purposeof fostering the development of LISA data analysis capabilities, and of demonstrating technical readiness for the maximum science exploitation of the LISA data. The first round of challenge data sets were released at the Sixth LISA Symposium. We briefly describe the objectives, structure, and time-line of this programme., Comment: 6 pages, in Proceedings of the Sixth International LISA Symposium (AIP, 2006)

Published
2006
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7. Accurate black hole evolutions by fourth-order numerical relativity

Author

Zlochower, Y., Baker, J. G., Campanelli, M., and Lousto, C. O.

Subjects
General Relativity and Quantum Cosmology
Abstract

We present techniques for successfully performing numerical relativity simulations of binary black holes with fourth-order accuracy. Our simulations are based on a new coding framework which currently supports higher order finite differencing for the BSSN formulation of Einstein's equations, but which is designed to be readily applicable to a broad class of formulations. We apply our techniques to a standard set of numerical relativity test problems, demonstrating the fourth-order accuracy of the solutions. Finally we apply our approach to binary black hole head-on collisions, calculating the waveforms of gravitational radiation generated and demonstrating significant improvements in waveform accuracy over second-order methods with typically achievable numerical resolution., Comment: 17 pages, 25 figures

Published
2005
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8. Chasing supermassive black hole merging events withAthenaandLISA

Author

Piro, L, primary, Colpi, M, additional, Aird, J, additional, Mangiagli, A, additional, Fabian, A C, additional, Guainazzi, M, additional, Marsat, S, additional, Sesana, A, additional, McNamara, P, additional, Bonetti, M, additional, Rossi, E M, additional, Tanvir, N R, additional, Baker, J G, additional, Belanger, G, additional, Dal Canton, T, additional, Jennrich, O, additional, Katz, M L, additional, and Luetzgendorf, N, additional

Published
2023
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9. Chasing supermassive black hole merging events with Athena and LISA

Author

Piro, L, Colpi, M, Aird, J, Mangiagli, A, Fabian, A, Guainazzi, M, Marsat, S, Sesana, A, Mcnamara, P, Bonetti, M, Rossi, E, Tanvir, N, Baker, J, Belanger, G, Dal Canton, T, Jennrich, O, Katz, M, Luetzgendorf, N, Piro L., Colpi M., Aird J., Mangiagli A., Fabian A. C., Guainazzi M., Marsat S., Sesana A., McNamara P., Bonetti M., Rossi E. M., Tanvir N. R., Baker J. G., Belanger G., Dal Canton T., Jennrich O., Katz M. L., Luetzgendorf N., Piro, L, Colpi, M, Aird, J, Mangiagli, A, Fabian, A, Guainazzi, M, Marsat, S, Sesana, A, Mcnamara, P, Bonetti, M, Rossi, E, Tanvir, N, Baker, J, Belanger, G, Dal Canton, T, Jennrich, O, Katz, M, Luetzgendorf, N, Piro L., Colpi M., Aird J., Mangiagli A., Fabian A. C., Guainazzi M., Marsat S., Sesana A., McNamara P., Bonetti M., Rossi E. M., Tanvir N. R., Baker J. G., Belanger G., Dal Canton T., Jennrich O., Katz M. L., and Luetzgendorf N.

Abstract

The European Space Agency is studying two large-class missions bound to operate in the decade of the 30s, and aiming at investigating the most energetic and violent phenomena in the Universe. Athena is poised to study the physical conditions of baryons locked in large-scale structures from the epoch of their formation, as well as to yield an accurate census of accreting supermassive black holes down to the epoch of reionization; LISA will extend the hunt for Gravitational Wave (GW) events to the hitherto unexplored mHz regime. We discuss in this paper the science that their concurrent operation could yield, and present possible Athena observational strategies. We focus on Supermassive (M≾ 107 M☉) Black Hole Mergers (SMBHMs), potentially accessible to Athena up to z ∼ 2. The simultaneous measurement of their electromagnetic (EM) and GW signals may enable unique experiments in the domains of astrophysics, fundamental physics, and cosmography, such as the magnetohydrodynamics of fluid flows in a rapidly variable space–time, the formation of coronae and jets in Active Galactic Nuclei, and the measurement of the speed of GW, among others. Key to achieve these breakthrough results will be the LISA capability of locating a SMBHM event with an error box comparable to, or better than the field-of-view of the Athena Wide Field Imager (≃ 0.4 deg2) and Athena capability to slew fast to detect the source during the inspiral phase and the post-merger phase. Together, the two observatories will open in principle the exciting possibility of truly concurrent EM and GW studies of the SMBHMs.

Published
2023

17. New Concepts for Space-Based Gravitational Wave Missions

Author

Stebbins, Robin T, Baker, J. G, Cooley, D. S, Gallagher, R. J, Hughes, S. P, Livas, J. C, Simpson, J. E, Thorpe, J. I, and Welter, G. L

Subjects
Astrophysics
Abstract

The most astrophysically interesting sources in the gravitational wave spectrum lie in the low-frequency band (0.0001 - 1 Hz), which is only accessible from space. For two decades, the LISA concept has been the leading contender for a detector in this band. Despite a strong recommendation from Astro2010, there is strong motivation to find a less expensive concept, even at the loss of some science. We are searching for a lower cost mission concept by examining alternate orbits, less-capable measurement concepts, radically different implementations of the measurement concept and other cost-saving ideas. We report the results of our searches to date, and summarize the analyses behind them.

Published
2011

21. Gravitational Radiation Characteristics of Nonspinning Black-Hole Binaries

Author

Kelly, B. J, Baker, J. G, Boggs, W. D, Centrella, J. M, vanMeter, J. R, and McWilliams, S. T

Subjects
Astronomy
Abstract

We present a detailed descriptive analysis of the gravitational radiation from binary mergers of non-spinning black holes, based on numerical relativity simulations of systems varying from equal-mass to a 6:1 mass ratio. Our analysis covers amplitude and phase characteristics of the radiation, suggesting a unified picture of the waveforms' dominant features in terms of an implicit rotating source, applying uniformly to the full wavetrain, from inspiral through ringdown. We construct a model of the late-stage frequency evolution that fits the l = m modes, and identify late-time relationships between waveform frequency and amplitude. These relationships allow us to construct a predictive model for the late-time waveforms, an alternative to the common practice of modelling by a sum of quasinormal mode overtones. We demonstrate an application of this in a new effective-one-body-based analytic waveform model.

Published
2008

22. The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project

Author

National Science Foundation (US), Netherlands Organization for Scientific Research, European Research Council, Gauss Centre for Supercomputing, Department of Energy (US), Academy of Finland, European Commission, John Templeton Foundation, Comisión Nacional de Investigación Científica y Tecnológica (Chile), Consejo Nacional de Ciencia y Tecnología (México), Universidad Nacional Autónoma de México, Generalitat Valenciana, Gordon and Betty Moore Foundation, National Radio Astronomy Observatory (US), Japanese Government, Japan Society for the Promotion of Science, Chinese Academy of Sciences, Leverhulme Trust, MIT International Science and Technology Initiatives, Ministry of Science and Technology (Taiwan), National Aeronautics and Space Administration (US), National Key Research and Development Program (China), National Research Foundation of Korea, Spinoza Prize, South African Radio Astronomy Observatory, Swedish Research Council, Government of Canada, Russian Science Foundation, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministero dell'Istruzione, dell'Università e della Ricerca, Chandra X-ray Observatory, CyVerse, Compute Ontario, Calcul Québec, Compute Canada, Porth, O., Chatterjee, K., Narayan, Ramesh, Gammie, C.F, Mizuno, Yosuke, Anninos, P., Baker, J. G., Bugli, M, Chan, C. K., Davelaar, J., Zanna, L. D., Zensus, J. A., Tilanus, R. P. J., Koay, J. Y., Young, K., Boland, W., Gentaz, O., Rao, R., Kino, Motoki, Nagar, Neil M., Rygl, K. L. J., Matthews, L. D., Palumbo, Daniel C. M., Ros, E., Psaltis, D, Medeiros, L., Jiang, Wu, Natarajan, I., Fish, Vincent L., Honma, M., Lauer, T. R., Schuster, K. F., Koch, P. M., Zhao, G., Issaoun, Sara, Roy, A. L., Schloerb, F. P., Kim, J., Azulay, Rebecca, Akiyama, Kazunori, Oyama, T., Alberdi, Antxón, Wagner, J., Stone, J. M., Menten, K. M., Ripperda, B., Narayanan, Gopal, Karuppusamy, R., Piétu, V., Broguiere, D., Roelofs, Freek, Noble, S. C., Baczko, A. K., Ball, D., Yuan, Y. F., Sánchez-Arguelles, D., Wu, Q., Ho, P., Lindqvist, M., Koyama, S., Sánchez, S., Keating, G. K., Plambeck, R., Li, Y. R., Kelly, B. J., Markoff, S., Kramer, Michael, van Rossum, D. R., Marscher, Alan P., Yuan, F., Patel, Nimesh, Wardle, J., Alef, W., Lobanov, A. P., Rezzolla, L., PopStefanija, A., Bintley, D, Conway, J. E., van Langevelde, H. J., Bremer, M., Sasada, Mahito, Moscibrodzka, M., Toma, K., Raymond, A. W., Wielgus, Maciek, Titus, Michael A., Hecht, M. H., Rogers, A., Fomalont, E., Carlstrom, J. E., Savolainen, T., Britzen, S., Loinard, Laurent, Özel, F., Nagai, H., Zhao, Shan-Shan, Brinkerink, C. D., Ryan, B. R., Trent, T., Jannuzi, B. T., SooHoo, J., Tiede, Paul, Ikeda, S., Lo, W. P., McKinney, J. C., Byun, D. Y., Tazaki, F., Crew, Geoffrey B., De Laurentis, M., Blackburn, Lindy, Chen, Y., Pesce, Dominic W., Broderick, Avery E., Trippe, S., Deane, Roger, Inoue, M., Baloković, M., Tsuda, S, Doeleman, Sheperd S., Janssen, M., Rottmann, H., Rose, M., Falcke, H., Preciado-López, J. A, Lee, S.-S, Kramer, C., Wong, G. N., Krichbaum, Thomas P., Hesper, R., Fragile, P. C., Chael, A., Mishra, B., Shao, L., Gómez, José L., Marrone, Daniel P., Gurwell, M., Kim, J. Y., Christian, P., Neri, Roberto, Friberg, P., Hughes, D. H., Gu, M., Chatterjee, S., Zhu, Z., Desvignes, Gregory, Shen, Z., Wex, N., Prather, B., Karami, M., Tomei, N., Hada, Kazuhiro, Young, A., James, D. J., Kawashima, T., Olivares, Hector, Ni, C., Kuo, C. Y., Fraga-Encinas, R., Etienne, Z. B., Liu, K., Moriyama, K., Chen, M. T., Lonsdale, Colin J., Dempsey, J., Liska, M., García, Roberto, Ramakrishnan, V., Huang, C. W. L., Galison, P., Noutsos, A., Okino, H., Matsushita, S., Johnson, M. D., MacDonald, N. R., Wharton, R., Barrett, John, White, C.J, Jeter, B., Lu, Ru-Sen, Georgiev, B., Ruszczyk, Chester A., Freeman, B., Eatough, R. P., Younsi, Z., Weintroub, Jonathan, Bronzwaer, T., Martí-Vidal, Iván, Fromm, Christian M., Müller, C., Liuzzo, Elisabetta, Mizuno, I., Bouman, Katherine L., Mao, J., Goddi, Ciriaco, Nakamura, M., Roshanineshat, A., Li, Z., Gold, R., Jorstad, S., Cordes, J. M., Cho, I., Ho, Luis C., Brissenden, R., van Bemmel, I., Torne, P., Huang, L., Small, D., Rawlings, M. G., Jung, T., Kettenis, Mark, Bower, G. C., Pen, U. L., Cui, Y., Pu, H. Y., Sohn, B. W., Morán, J. M., Asada, Keiichi, National Science Foundation (US), Netherlands Organization for Scientific Research, European Research Council, Gauss Centre for Supercomputing, Department of Energy (US), Academy of Finland, European Commission, John Templeton Foundation, Comisión Nacional de Investigación Científica y Tecnológica (Chile), Consejo Nacional de Ciencia y Tecnología (México), Universidad Nacional Autónoma de México, Generalitat Valenciana, Gordon and Betty Moore Foundation, National Radio Astronomy Observatory (US), Japanese Government, Japan Society for the Promotion of Science, Chinese Academy of Sciences, Leverhulme Trust, MIT International Science and Technology Initiatives, Ministry of Science and Technology (Taiwan), National Aeronautics and Space Administration (US), National Key Research and Development Program (China), National Research Foundation of Korea, Spinoza Prize, South African Radio Astronomy Observatory, Swedish Research Council, Government of Canada, Russian Science Foundation, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Ministero dell'Istruzione, dell'Università e della Ricerca, Chandra X-ray Observatory, CyVerse, Compute Ontario, Calcul Québec, Compute Canada, Porth, O., Chatterjee, K., Narayan, Ramesh, Gammie, C.F, Mizuno, Yosuke, Anninos, P., Baker, J. G., Bugli, M, Chan, C. K., Davelaar, J., Zanna, L. D., Zensus, J. A., Tilanus, R. P. J., Koay, J. Y., Young, K., Boland, W., Gentaz, O., Rao, R., Kino, Motoki, Nagar, Neil M., Rygl, K. L. J., Matthews, L. D., Palumbo, Daniel C. M., Ros, E., Psaltis, D, Medeiros, L., Jiang, Wu, Natarajan, I., Fish, Vincent L., Honma, M., Lauer, T. R., Schuster, K. F., Koch, P. M., Zhao, G., Issaoun, Sara, Roy, A. L., Schloerb, F. P., Kim, J., Azulay, Rebecca, Akiyama, Kazunori, Oyama, T., Alberdi, Antxón, Wagner, J., Stone, J. M., Menten, K. M., Ripperda, B., Narayanan, Gopal, Karuppusamy, R., Piétu, V., Broguiere, D., Roelofs, Freek, Noble, S. C., Baczko, A. K., Ball, D., Yuan, Y. F., Sánchez-Arguelles, D., Wu, Q., Ho, P., Lindqvist, M., Koyama, S., Sánchez, S., Keating, G. K., Plambeck, R., Li, Y. R., Kelly, B. J., Markoff, S., Kramer, Michael, van Rossum, D. R., Marscher, Alan P., Yuan, F., Patel, Nimesh, Wardle, J., Alef, W., Lobanov, A. P., Rezzolla, L., PopStefanija, A., Bintley, D, Conway, J. E., van Langevelde, H. J., Bremer, M., Sasada, Mahito, Moscibrodzka, M., Toma, K., Raymond, A. W., Wielgus, Maciek, Titus, Michael A., Hecht, M. H., Rogers, A., Fomalont, E., Carlstrom, J. E., Savolainen, T., Britzen, S., Loinard, Laurent, Özel, F., Nagai, H., Zhao, Shan-Shan, Brinkerink, C. D., Ryan, B. R., Trent, T., Jannuzi, B. T., SooHoo, J., Tiede, Paul, Ikeda, S., Lo, W. P., McKinney, J. C., Byun, D. Y., Tazaki, F., Crew, Geoffrey B., De Laurentis, M., Blackburn, Lindy, Chen, Y., Pesce, Dominic W., Broderick, Avery E., Trippe, S., Deane, Roger, Inoue, M., Baloković, M., Tsuda, S, Doeleman, Sheperd S., Janssen, M., Rottmann, H., Rose, M., Falcke, H., Preciado-López, J. A, Lee, S.-S, Kramer, C., Wong, G. N., Krichbaum, Thomas P., Hesper, R., Fragile, P. C., Chael, A., Mishra, B., Shao, L., Gómez, José L., Marrone, Daniel P., Gurwell, M., Kim, J. Y., Christian, P., Neri, Roberto, Friberg, P., Hughes, D. H., Gu, M., Chatterjee, S., Zhu, Z., Desvignes, Gregory, Shen, Z., Wex, N., Prather, B., Karami, M., Tomei, N., Hada, Kazuhiro, Young, A., James, D. J., Kawashima, T., Olivares, Hector, Ni, C., Kuo, C. Y., Fraga-Encinas, R., Etienne, Z. B., Liu, K., Moriyama, K., Chen, M. T., Lonsdale, Colin J., Dempsey, J., Liska, M., García, Roberto, Ramakrishnan, V., Huang, C. W. L., Galison, P., Noutsos, A., Okino, H., Matsushita, S., Johnson, M. D., MacDonald, N. R., Wharton, R., Barrett, John, White, C.J, Jeter, B., Lu, Ru-Sen, Georgiev, B., Ruszczyk, Chester A., Freeman, B., Eatough, R. P., Younsi, Z., Weintroub, Jonathan, Bronzwaer, T., Martí-Vidal, Iván, Fromm, Christian M., Müller, C., Liuzzo, Elisabetta, Mizuno, I., Bouman, Katherine L., Mao, J., Goddi, Ciriaco, Nakamura, M., Roshanineshat, A., Li, Z., Gold, R., Jorstad, S., Cordes, J. M., Cho, I., Ho, Luis C., Brissenden, R., van Bemmel, I., Torne, P., Huang, L., Small, D., Rawlings, M. G., Jung, T., Kettenis, Mark, Bower, G. C., Pen, U. L., Cui, Y., Pu, H. Y., Sohn, B. W., Morán, J. M., and Asada, Keiichi

Abstract

Recent developments in compact object astrophysics, especially the discovery of merging neutron stars by LIGO, the imaging of the black hole in M87 by the Event Horizon Telescope, and high- precision astrometry of the Galactic Center at close to the event horizon scale by the GRAVITY experiment motivate the development of numerical source models that solve the equations of general relativistic magnetohydrodynamics (GRMHD). Here we compare GRMHD solutions for the evolution of a magnetized accretion flow where turbulence is promoted by the magnetorotational instability from a set of nine GRMHD codes: Athena++, BHAC, Cosmos++, ECHO, H-AMR, iharm3D, HARM-Noble, IllinoisGRMHD, and KORAL. Agreement among the codes improves as resolution increases, as measured by a consistently applied, specially developed set of code performance metrics. We conclude that the community of GRMHD codes is mature, capable, and consistent on these test problems. © 2019. The American Astronomical Society. All rights reserved.

Published
2019

23. Modeling Gravitational Radiation Waveforms from Black Hole Mergers

Author

Baker, J. G, Centrelia, J. M, Choi, D, Koppitz, M, and VanMeter, J

Subjects
Astronomy
Abstract

Gravitational radiation from merging binary black hole systems is anticipated as a key source for gravitational wave observations. Ground-based instruments, such as the Laser Interferometer Gravitational-wave Observatory (LIGO) may observe mergers of stellar-scale black holes, while the space-based Laser Interferometer Space Antenna (LISA) observatory will be sensitive to mergers of massive galactic-center black holes over a broad range of mass scales. These cataclysmic events may emit an enormous amount of energy in a brief time. Gravitational waves from comparable mass mergers carry away a few percent of the system's mass-energy in just a few wave cycles, with peak gravitational wave luminosities on the order of 10^23 L_Sun. Optimal analysis and interpretation of merger observation data will depend on developing a detailed understanding, based on general relativistic modeling, of the radiation waveforms. We discuss recent progress in modeling radiation from equal mass mergers using numerical simulations of Einstein's gravitational field equations, known as numerical relativity. Our simulations utilize Adaptive Mesh Refinement (AMR) to allow high-resolution near the black holes while simultaneously keeping the outer boundary of the computational domain far from the black holes, and making it possible to read out gravitational radiation waveforms in the weak-field wave zone. We discuss the results from simulations beginning with the black holes orbiting near the system's innermost stable orbit, comparing the recent simulations with earlier "Lazarus" waveform estimates based on an approximate hybrid numerical/perturbative technique.

Published
2006

40. An overview of the second round of the Mock LISA Data Challenges

Author

Arnaud, K. A., Babak, S., Baker, J. G., Benacquista, M. J., Cornish, M. J., Cutler, C., Finn, L. S., Larson, S. L., Littenberg, T., Porter, E. K., Vallisneri, M., Vecchio, A., Vinet, J-Y, Mock, LISA Data Challenge Task Force, Arnaud, K. A., Babak, S., Baker, J. G., Benacquista, M. J., Cornish, M. J., Cutler, C., Finn, L. S., Larson, S. L., Littenberg, T., Porter, E. K., Vallisneri, M., Vecchio, A., Vinet, J-Y, and Mock, LISA Data Challenge Task Force

Abstract

The Mock Data Challenges (MLDCs) have the dual purpose of fostering the development of LISA data-analysis tools and capabilities and of demonstrating the technical readiness already achieved by the gravitational-wave community in distilling a rich science payoff from the LISA data. The first round of MLDCs has just been completed and the second-round data sets are being released shortly after this workshop. The second-round data sets contain radiation from an entire Galactic population of stellar-mass binary systems, from massive-black-hole binaries, and from extreme-mass-ratio inspirals. These data sets are designed to capture much of the complexity that is expected in the actual LISA data, and should provide a fairly realistic setting to test advanced data-analysis techniques, and in particular the global aspect of the analysis. Here we describe the second round of MLDCs and provide details about its implementation.

Published
2007

41. Report on the first round of the Mock LISA Data Challenges

Author

Arnaud, K. A., Auger, G., Babak, S., Baker, J. G., Benacquista, M. J., Bloomer, E., Brown, D. A., Camp, J. B., Cannizzo, J. K., Christensen, N., Clark, J., Cornish, N. J., Crowder, J., Cutler, C., Finn, L. S., Halloin, H., Hayama, K., Hendry, M., Jeannin, O., Królak, A., Larson, S. L., Mandel, I., Messenger, C., Meyer, R., Mohanty, S., Nayak, R., Numata, K., Petiteau, A., Pitkin, M., Plagnol, E., Porter, E. K., Prix, R., Roever, C., Stroeer, A., Thirumalainambi, R., Thompson, D. E., Toher, J., Umstaetter, R., Vallisneri, M., Vecchio, A., Veitch, J., Vinet, J. -Y., Whelan, J. T., Woan, G., Arnaud, K. A., Auger, G., Babak, S., Baker, J. G., Benacquista, M. J., Bloomer, E., Brown, D. A., Camp, J. B., Cannizzo, J. K., Christensen, N., Clark, J., Cornish, N. J., Crowder, J., Cutler, C., Finn, L. S., Halloin, H., Hayama, K., Hendry, M., Jeannin, O., Królak, A., Larson, S. L., Mandel, I., Messenger, C., Meyer, R., Mohanty, S., Nayak, R., Numata, K., Petiteau, A., Pitkin, M., Plagnol, E., Porter, E. K., Prix, R., Roever, C., Stroeer, A., Thirumalainambi, R., Thompson, D. E., Toher, J., Umstaetter, R., Vallisneri, M., Vecchio, A., Veitch, J., Vinet, J. -Y., Whelan, J. T., and Woan, G.

Abstract

The Mock LISA Data Challenges (MLDCs) have the dual purpose of fostering the development of LISA data analysis tools and capabilities, and demonstrating the technical readiness already achieved by the gravitational-wave community in distilling a rich science payoff from the LISA data output. The first round of MLDCs has just been completed: nine challenges consisting of data sets containing simulated gravitational-wave signals produced either by galactic binaries or massive black hole binaries embedded in simulated LISA instrumental noise were released in June 2006 with deadline for submission of results at the beginning of December 2006. Ten groups have participated in this first round of challenges. All of the challenges had at least one entry which successfully characterized the signal to better than 95% when assessed via a correlation with phasing ambiguities accounted for. Here, we describe the challenges, summarize the results and provide a first critical assessment of the entries.

Published
2007

45. An overview of the second round of the Mock LISA Data Challenges

Author

Arnaud, K A, primary, Babak, S, additional, Baker, J G, additional, Benacquista, M J, additional, Cornish, N J, additional, Cutler, C, additional, Finn, L S, additional, Larson, S L, additional, Littenberg, T, additional, Porter, E K, additional, Vallisneri, M, additional, Vecchio, A, additional, and Vinet, J-Y, additional

Published
2007
Full Text
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46. Report on the first round of the Mock LISA Data Challenges

Author

Arnaud, K A, primary, Auger, G, additional, Babak, S, additional, Baker, J G, additional, Benacquista, M J, additional, Bloomer, E, additional, Brown, D A, additional, Camp, J B, additional, Cannizzo, J K, additional, Christensen, N, additional, Clark, J, additional, Cornish, N J, additional, Crowder, J, additional, Cutler, C, additional, Finn, L S, additional, Halloin, H, additional, Hayama, K, additional, Hendry, M, additional, Jeannin, O, additional, Królak, A, additional, Larson, S L, additional, Mandel, I, additional, Messenger, C, additional, Meyer, R, additional, Mohanty, S, additional, Nayak, R, additional, Numata, K, additional, Petiteau, A, additional, Pitkin, M, additional, Plagnol, E, additional, Porter, E K, additional, Prix, R, additional, Roever, C, additional, Stroeer, A, additional, Thirumalainambi, R, additional, Thompson, D E, additional, Toher, J, additional, Umstaetter, R, additional, Vallisneri, M, additional, Vecchio, A, additional, Veitch, J, additional, Vinet, J-Y, additional, Whelan, J T, additional, and Woan, G, additional

Published
2007
Full Text
View/download PDF

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