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9 results on '"Bailes M"'

1. Gravitational waves from binary supermassive black holes missing in pulsar observations

Author

Shannon, RM, Ravi, V, Lentati, LT, Lasky, PD, Hobbs, G, Kerr, M, Manchester, RN, Coles, WA, Levin, Y, Bailes, M, Bhat, NDR, Burke-Spolaor, S, Dai, S, Keith, MJ, Osłowski, S, Reardon, DJ, van Straten, W, Toomey, L, Wang, J-B, Wen, L, Wyithe, JSB, and Zhu, X-J

Subjects
General Science & Technology
Abstract

Gravitational waves are expected to be radiated by supermassive black hole binaries formed during galaxy mergers. A stochastic superposition of gravitational waves from all such binary systems would modulate the arrival times of pulses from radio pulsars. Using observations of millisecond pulsars obtained with the Parkes radio telescope, we constrained the characteristic amplitude of this background, A(c,yr), to be

Published
2015

2. Gravitational-Wave Limits from Pulsar Timing Constrain Supermassive Black Hole Evolution

Author

Shannon, RM, Ravi, V, Coles, WA, Hobbs, G, Keith, MJ, Manchester, RN, Wyithe, JSB, Bailes, M, Bhat, NDR, Burke-Spolaor, S, Khoo, J, Levin, Y, Osłowski, S, Sarkissian, JM, van Straten, W, Verbiest, JPW, and Wang, J-B

Subjects
General Science & Technology
Abstract

The formation and growth processes of supermassive black holes (SMBHs) are not well constrained. SMBH population models, however, provide specific predictions for the properties of the gravitational-wave background (GWB) from binary SMBHs in merging galaxies throughout the universe. Using observations from the Parkes Pulsar Timing Array, we constrain the fractional GWB energy density (Ω(GW)) with 95% confidence to be Ω(GW)(H0/73 kilometers per second per megaparsec)(2) < 1.3 × 10(-9) (where H0 is the Hubble constant) at a frequency of 2.8 nanohertz, which is approximately a factor of 6 more stringent than previous limits. We compare our limit to models of the SMBH population and find inconsistencies at confidence levels between 46 and 91%. For example, the standard galaxy formation model implemented in the Millennium Simulation Project is inconsistent with our limit with 50% probability.

Published
2013

4. A Population of Fast Radio Bursts at Cosmological Distances

Author

Thornton, D., Steppers, B., Bailes, M., Barsdell, B., Bates, S., Bhat, N. D. R., Burgay, M., Burke-Spolaor, S., Champion, D. J., Coster, P., D'Amico, N., Jameson, A., Johnston, S., Keith, M., Kramer, M., Levin, L., Milia, S., Ng, C., Possenti, A., and van Straten, W.

Published
2013
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