The NANOGrav 11 yr Data Set: Limits on Gravitational Wave Memory

Aggarwal, K., Arzoumanian, Z., Baker, P. T., Brazier, A., Brook, P. R., Burke-spolaor, S., Chatterjee, S., Cordes, J. M., Cornish, N. J., Crawford, F., Cromartie, H. T., Crowter, K., Decesar, M., Demorest, P. B., Dolch, T., Ellis, J. A., Ferdman, R. D., Ferrara, E. C., Fonseca, E., Garver-daniels, N., Gentile, P., Good, D., Hazboun, J. S., Holgado, A. M., Huerta, E. A., Islo, K., Jennings, R., Jones, G., Jones, M. L., Kaplan, D. L., Kelley, L. Z., Key, J. S., Lam, M. T., Lazio, T. J. W., Levin, L., Lorimer, D. R., Luo, J., Lynch, R. S., Madison, D. R., Mclaughlin, M. A., Mcwilliams, S. T., Mingarelli, C. M. F., Ng, C., Nice, D. J., Pennucci, T. T., Pol, N. S., Ransom, S. M., Ray, P. S., Siemens, X., Simon, J., Spiewak, R., Stairs, I. H., Stinebring, D. R., Stovall, K., Swiggum, J. K., Taylor, S. R., Vallisneri, M., Van Haasteren, R., Vigeland, S. J., Witt, C. A. and Zhu, W. W. (2020) The NANOGrav 11 yr Data Set: Limits on Gravitational Wave Memory. Astrophysical Journal, 889 (1). ISSN 0004-637X

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The mergers of supermassive black hole binaries (SMBHBs) promise to be incredible sources of gravitational waves (GWs). While the oscillatory part of the merger gravitational waveform will be outside the frequency sensitivity range of pulsar timing arrays, the nonoscillatory GW memory effect is detectable. Further, any burst of GWs will produce GW memory, making memory a useful probe of unmodeled exotic sources and new physics. We searched the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) 11 yr data set for GW memory. This data set is sensitive to very low-frequency GWs of similar to 3 to 400 nHz (periods of similar to 11 yr-1 month). Finding no evidence for GWs, we placed limits on the strain amplitude of GW memory events during the observation period. We then used the strain upper limits to place limits on the rate of GW memory causing events. At a strain of 2.5 x 10(-14), corresponding to the median upper limit as a function of source sky position, we set a limit on the rate of GW memory events at eta M similar to 2 x 10(10) iota = pi/3 at a distance of 1 Gpc. As a test of our analysis, we analyzed the NANOGrav 9 yr data set as well. This analysis found an anomolous signal, which does not appear in the 11 yr data set. This signal is not a GW, and its origin remains unknown.

Item Type: Article
Uncontrolled Keywords: astronomy data analysis,bursts,gravitational waves,millisecond pulsars,pulsar-timing package,searches,tempo2,astronomy and astrophysics,space and planetary science ,/dk/atira/pure/subjectarea/asjc/3100/3103
Faculty \ School:

Faculty of Social Sciences > School of Social Work
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Depositing User: LivePure Connector
Date Deposited: 20 Aug 2020 01:05
Last Modified: 20 Aug 2020 01:05
DOI: 10.3847/1538-4357/ab6083

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