Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session W11: Data Analysis Techniques for Ground-Based Gravitational Wave Interferometers |
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Sponsoring Units: GGR DAP Chair: Laura Cadonati, University of Massachusetts-Amherst Room: Plaza Court 1 |
Tuesday, May 5, 2009 10:45AM - 10:57AM |
W11.00001: Exploring Use of NR Waveforms in Burst Analyses of BBH Mergers Deirdre Shoemaker, Laura Cadonati, Shourov Chatterji, Sebastian Fischetti, Satyanarayan Mohapatra Gravitational wave ground-based detectors and numerical-source codes are individually performing at a top-notch level. We explore the added benefit to the detection and understanding of gravitational wave sources made possible by joining the expertise of numerical relativists and data analysts in addressing the question of what is the most effective role for numerical relativity (NR) waveforms in the detection and characterization of binary black hole (BBH) coalescence. We present a study of detection systematics using waveforms produced by the MayaKranc code that are added to simulated, colored, Gaussian noise and analyzed with the unmodeled burst search algorithm Omega (also used in LIGO-Virgo burst searches). Detection efficiency and parameter accuracy are systematically weighted against parameters such as spin and mass ratio as well as numerical details such as waveform accuracy, the number of included modes and extraction radius. These detection systematics are mapped to numerical and physical choices in NR to determine the effectiveness of numerical waveforms in burst analysis. [Preview Abstract] |
Tuesday, May 5, 2009 10:57AM - 11:09AM |
W11.00002: TwoSpect: an all-sky search for continuous gravitational waves from neutron stars in binary systems Evan Goetz, Keith Riles An all-sky search for continuous gravitational waves from binary pulsars is notorious for its computational challenge. We present a new hierarchical method called TwoSpect, which we propose for such a search. The search exploits the periodic orbital modulations of the source waves by searching for patterns in doubly-Fourier-transformed data. The algorithm will be described and sensitivity estimates presented. [Preview Abstract] |
Tuesday, May 5, 2009 11:09AM - 11:21AM |
W11.00003: delayRatio: A Gravitational Wave Event Physical Likelihood Estimator Based on Detection Delays and SNR Ratios Amber Stuver delayRatio is an efficient physical likelihood estimator which is designed to be used as part of a candidate coincident burst/inspiral gravitational wave event follow-up investigation. Given the event parameter estimation of detection delays and the SNR ratio between a pair of detectors, delayRatio returns a Boolean indicating if the parameters fall within physical ranges determined by using polarization averaged antenna patterns. Since polarization effects can cause physical signals to lay outside the polarization averaged bounds, probabilities based on Monte Carlo simulations of physical signals are also calculated to estimate the likelihood of a polarized signal that falls outside of the polarization averaged bounds. This work has also been generalized for 3+ detectors. For these combinations, the primary likelihood condition is the physicality of detection delays while SNR ratios give secondary validation measures. Therefore, this work has easily been extended to function as a simplistic source location tool based solely on the detection delays. [Preview Abstract] |
Tuesday, May 5, 2009 11:21AM - 11:33AM |
W11.00004: ABSTRACT WITHDRAWN |
Tuesday, May 5, 2009 11:33AM - 11:45AM |
W11.00005: Sky Localization of Gravitational Wave Signals Using Time of Arrival Larry Price, Patrick Brady An important feature of low-latency searches for gravitational waves is the ability to quickly identify the sky location of possible sources. This then allows for rapid searches for possible electromagnetic signatures by pointing more conventional telescopes. Here we will discuss a method of localizing inspiral sources using time of arrival data from both LIGO detectors and Virgo and how well we can expect this method to perform based on the analysis of simulated signals. Particular focus will be placed on how many pointings will be required for each signal and its dependence on the signal to noise ratio. [Preview Abstract] |
Tuesday, May 5, 2009 11:45AM - 11:57AM |
W11.00006: Phase Separation and Peak Time Delays of Gravitational Wave Polarizations Erik Lentz, Michele Zanolin, Quentin Bailey Triangulation of a randomly polarized Gravitational wave transients that uses time discrepancies of the interferometer sites can be affected~ by the two polarizations. In particular, phase differences, or time delays, of the two polarizations can be confused with the time delay related to the angle of arrival and induce an error in the direction reconstruction if one instrument detects mostly one polarization and another detects mostly the other polarization. Various sources are discussed and a frequency dependent upper limit on the triangulation error is introduced. [Preview Abstract] |
Tuesday, May 5, 2009 11:57AM - 12:09PM |
W11.00007: Data quality, vetoes and detection confidence in burst searches Lindy Blackburn In LIGO/Virgo burst searches, data quality and vetoes represent the use of auxiliary detector information to reject instrumental artifacts which, rather than Gaussian fluctuations of the gravitational-wave signal, dominate the background of almost every analysis. We present the refinement of these methods throughout S5 and VSR1, and show their performance on typical background. In addition to data quality and vetoes, whose application is largely automated, the burst group has also developed an extensive detection checklist for individually evaluating event candidates identified by our search pipelines. [Preview Abstract] |
Tuesday, May 5, 2009 12:09PM - 12:21PM |
W11.00008: Background estimation due to correlated noise in H1 and H2 detectors using time reverse filtering method Rahul Biswas The current network of earth-based detectors are looking for the first traces of gravitational waves. Coalescence of binary neutron stars, binary black holes and neutron star black hole binaries are potential sources of gravitational waves. The three LIGO detectors, 4km and 2km detectors in Hanford, WA and a 4km detector in Livingston, LA, have been collecting data and searching for traces of gravitational waves. The two Hanford detectors are collocated and share the same vacuum system, hence the noises in the detectors are correlated. Interpretation of the data from the Hanford detectors requires accurate knowledge of the background due to detector noise. Some searches ignore data when only H1 and H2 are operating, due to our inability to measure the impact of correlated noise on our background rates. A study has been done to better estimate the background in H1 and H2 searches for compact binaries. The method uses time-reversed filters to discover a multiplicative factor which can be used to correct background estimates from time slide investigations. Investigations of the method and potential issues with it will be discussed. [Preview Abstract] |
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