Premerger Localization of Gravitational Wave Standard Sirens withLISA: Triggered Search for an Electromagnetic Counterpart
- 10 September 2008
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 684 (2), 870-887
- https://doi.org/10.1086/590230
Abstract
Electromagnetic (EM) counterparts to supermassive black hole binary mergers observed by LISA can be localized to within the field of view of astronomical instruments ~10 deg^2 hours to weeks prior to coalescence. The temporal coincidence of any prompt EM counterpart with a gravitationally-timed merger may offer the best chance of identifying a unique host galaxy. We discuss the challenges posed by searches for prompt EM counterparts and propose novel observational strategies to address them. In particular, we discuss the size and shape evolution of the LISA localization error ellipses on the sky, and quantify the requirements for dedicated EM surveys of the area prior to coalescence. A triggered EM counterpart search campaign will require monitoring a several-square degree area. It could aim for variability at the 24-27 mag level in optical bands, for example, which corresponds to 1-10% of the Eddington luminosity of the prime LISA sources of 10^6-10^7 Msun BHs at z=1-2, on time-scales of minutes to hours, the orbital time-scale of the binary in the last 2-4 weeks. A cross-correlation of the period of any variable EM signal with the quasi-periodic gravitational waveform over 10-1000 cycles may aid the detection. Alternatively, EM searches can detect a transient signal accompanying the coalescence. We highlight the measurement of differences in the arrival times of photons and gravitons from the same cosmological source as a valuable independent test of the massive character of gravity, and of possible violations of Lorentz invariance in the gravity sector.Comment: 17 pages, 9 figures, submitted to ApKeywords
This publication has 87 references indexed in Scilit:
- Higher signal harmonics, LISA’s angular resolution, and dark energyPhysical Review D, 2007
- The QUEST Large Area CCD CameraPublications of the Astronomical Society of the Pacific, 2007
- Higher harmonics increase LISA’s mass reach for supermassive black holesPhysical Review D, 2007
- Getting a Kick Out of Numerical RelativityThe Astrophysical Journal, 2006
- Parameter estimation of coalescing supermassive black hole binaries with LISAPhysical Review D, 2006
- Testing post-Newtonian theory with gravitational wave observationsClassical and Quantum Gravity, 2006
- Eccentricity of Supermassive Black Hole Binaries Coalescing from Gas‐rich MergersThe Astrophysical Journal, 2005
- Accretion during the Merger of Supermassive Black HolesThe Astrophysical Journal, 2002
- Mass Flow through Gaps in Circumbinary DisksThe Astrophysical Journal, 1996
- Dynamics of binary-disk interaction. 1: Resonances and disk gap sizesThe Astrophysical Journal, 1994