Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session W11: Gravitational Wave Searches |
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Sponsoring Units: GGR Chair: Lior Burko, The University of Alabama, Huntsville Room: Hyatt Regency Dallas Cumberland E |
Tuesday, April 25, 2006 10:45AM - 10:57AM |
W11.00001: The LIGO Scientific Collaboration search for inspiralling binary neutron stars Duncan Brown The three LIGO interferometers and the GEO600 interferometer operate as a network of detectors under the LIGO Scientific Collaboration (LSC). This network has now reached unprecedented levels of sensitivity. In this talk we will present the status and current results from the binary neutron star search in LIGO/GEO data. [Preview Abstract] |
Tuesday, April 25, 2006 10:57AM - 11:09AM |
W11.00002: Search for Gravitational Wave Bursts in Data from the LIGO S4 Run Peter Shawhan In early 2005, the LIGO Scientific Collaboration conducted a fourth science run, called S4, with the LIGO and GEO 600 gravitational wave detectors. This run featured improved sensitivities and fairly high duty cycles for all detectors. Data from the three LIGO detectors has been used to carry out a search for short-duration gravitational wave signals of arbitrary form with frequency content between 64 Hz and 1600 Hz. Results from this search will be presented, including studies of the sensitivity of the search for various signal waveforms. [Preview Abstract] |
Tuesday, April 25, 2006 11:09AM - 11:21AM |
W11.00003: Searching the LIGO data for coincidences with Gamma Ray Bursts Alexander Dietz The discovery that short Gamma Ray Bursts (GRB) also occur in old elliptical galaxies supports the idea that they are generated by the merger of two neutron stars or a neutron star with a black hole, after they spiral together due to emission of gravitational waves. Because the exact position of those GRB is known in most cases, we are searching the LIGO data at those times with an analysis pipeline, which also runs online. Injections have been performed to test this analysis pipeline and to test the detection statistics. The status of this search is presented in this talk. [Preview Abstract] |
Tuesday, April 25, 2006 11:21AM - 11:33AM |
W11.00004: Stackslide search for continuous gravitational waves using LIGO S4 data Gregory Mendell The LIGO Scientific Collaboration has developed several methods to search for continuous gravitational-wave signals, for example from rotating asymmetric neutron stars. We present an overview of the Stackslide method, and a status report on its application to LIGO data taken during the fourth science run (S4). Progress on plans to incorporate this method into future hierarchical searches will also be presented. [Preview Abstract] |
Tuesday, April 25, 2006 11:33AM - 11:45AM |
W11.00005: Broadband Search for Continuous-Wave Gravitation Radiation with LIGO Vladimir Dergachev Isolated rotating neutron stars are expected to emit gravitational radiation of nearly constant frequency and amplitude. Searches for such radiation with the LIGO interferometers are underway, using data taken from LIGO's first several data runs. Because the gravitational wave signal amplitudes are thought to be extremely weak, long time integrations must be carried out to detect a signal. This requires consideration of motion of the Earth (daily rotation and orbital motion) which induces substantial modulations of detected frequency and amplitude that are highly dependent on source location. We will describe an algorithm called PowerFlux, used to account for these modulations, when summing power spectral density estimates incoherently over long time intervals. Instrumental artifacts that contribute to false signals for certain frequencies and sky directions will also be discussed. We will describe progress in applying PowerFlux to a broadband search in data from the 30-day fourth LIGO Science Run (S4) and to the first two months of the ongoing S5 run. [Preview Abstract] |
Tuesday, April 25, 2006 11:45AM - 11:57AM |
W11.00006: Coherent searches for periodic gravitational waves from unknown isolated sources and Scorpius X-1: results from the second LIGO science run Keita Kawabe We present results from two searches for periodic gravitational waves using the most sensitive few hours of data from the second LIGO science run. The first search targets isolated previously unknown neutron stars and covers the entire sky in a frequency band between 160 and 728.8 Hz assuming a frequency derivative less than 4E-10 Hz/s. The second search targets the accreting neutron star in the low-mass X-ray binary system Scorpius X-1 and covers the band 464-484 Hz and the band 604-624 Hz, as well as two orbit parameters. With these analyses we present the first broad-band wide parameter space upper limits on periodic gravitational waves from coherent search techniques. The methods utilized here lay the foundations for upcoming hierarchical searches of more sensitive data which may detect astrophysical signals. [Preview Abstract] |
Tuesday, April 25, 2006 11:57AM - 12:09PM |
W11.00007: The Q Pipeline search for gravitational-wave bursts with LIGO Shourov Chatterji The Q Pipeline is a multiresolution time-frequency search for gravitational-wave bursts of a priori unknown waveform. The method coherently searches data from multiple interferometric detectors for signal content within a well-defined region of time, frequency, and Q space. Here Q is the dimensionless quality factor of a signal as well as the approximate number of oscillations of its time-domain waveform. This talk briefly reviews the motivation for such a search, outlines its essential components, and sets forth a complete analysis pipeline. We then present the current status of the method applied to recent data from the LIGO detectors. [Preview Abstract] |
Tuesday, April 25, 2006 12:09PM - 12:21PM |
W11.00008: Search for Gravitational Wave Bursts in LIGO's S5 run Igor Yakushin By the end of 2005, the LIGO detectors reached their design sensitivity. The S5 run started in November 2005, and is expected to collect a year's worth of coincident data. We present the status of the search for unmodeled short-duration bursts during the first few months of the S5 run. [Preview Abstract] |
Tuesday, April 25, 2006 12:21PM - 12:33PM |
W11.00009: Search for gravitational wave bursts associated with gamma-ray bursts using LIGO detectors Isabel Leonor We present the status of searches for gravitational-wave bursts associated with gamma-ray bursts (GRBs) that were detected by satellite experiments during LIGO science runs. A search for associated gravitational waves from individual GRBs, as well as a statistical search for a cumulative gravitational wave signal from the GRB sample, were made. These searches were confined to short time windows surrounding each GRB trigger. [Preview Abstract] |
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