Bulletin of the American Physical Society
78th Annual Meeting of the Southeastern Section of the APS
Volume 56, Number 9
Wednesday–Saturday, October 19–22, 2011; Roanoke, Virginia
Session ND: Astronomy |
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Chair: Leo Piilonen, Virginia Polytechnic Institute and State University Room: Crystal Ballroom DE |
Saturday, October 22, 2011 8:30AM - 9:00AM |
ND.00001: Gravitational Wave Astronomy and Astrophysics: A Status Report Invited Speaker: The LIGO, GEO and Virgo gravitational wave detectors have collected a few years of data with good sensitivity and have carried out searches for several types of gravitational-wave signals. I will highlight a few search results obtained so far which shed light on plausible astrophysical sources. The detectors are currently undergoing major upgrades and will run again as Advanced LIGO and Advanced Virgo beginning around 2015. I will describe several areas of astrophysics which will be opened up by the future data. [Preview Abstract] |
Saturday, October 22, 2011 9:00AM - 9:30AM |
ND.00002: A Multi-Messenger Search for Radio Transients and Gravitational Waves Invited Speaker: The sensitivity of gravitational waves searches could be improved by coincident observation of electromagnetic signals from expected gravitational wave sources. One possibility is using low-frequency radio transients to trigger and constrain searches for gravitational wave signals. Both are all-sky observations with a number of common sources, and low frequency observations are able to provide spatial and temporal constraints to the search for gravitational wave signals. There is also the added benefit that coincident low-frequency radio and gravitational spectra will allow for more in-depth study of astrophysical events and processes than otherwise possible. In this talk I will layout the case for using low-frequency radio observations to trigger and constrain searches for coincident gravitational wave signals. Common sources and potential ways the joint observation of low-frequency radio and gravitational waves can enhance our understanding of the physics behind these sources will be addressed. [Preview Abstract] |
Saturday, October 22, 2011 9:30AM - 10:00AM |
ND.00003: A Precision Test for an Extra Spatial Dimension Using Black-Hole---Pulsar Binary Systems Invited Speaker: Given the difficulties in testing current frontier physics ideas in earth-based experiments, we might profitably look to the cosmos for observational tests. I will discuss observations that could set a limit on the size of a warped extra spatial dimension in the braneworld scenario. The observations would be similar to those that provided evidence of gravitational radiation by the binary pulsar B1913$+$16. In the presence of a warped extra spatial dimension a stellar mass black hole will evaporate at a sufficiently high rate to produce an observable orbital effect in a black-hole---pulsar binary system. For some masses and orbital parameters the binary components will outspiral, the opposite of the behavior due to energy loss by gravitational radiation alone. Observations of a black-hole---pulsar system could set considerably better limits on size of the extra dimension in these braneworld models than could be determined by torsion-balance gravity experiments in the foreseeable future. [Preview Abstract] |
Saturday, October 22, 2011 10:00AM - 10:30AM |
ND.00004: Kinetic Luminosity of Quasar Outflows and its Implications to AGN Feedback Invited Speaker: Sub-relativistic outflows are seen as blueshifted absorption troughs in the spectra of roughly one third of all quasars. I will describe how we determine the mass flux and kinetic luminosity of these outflows and show that the derived values suggest that absorption outflows may be a main agent of AGN feedback scenarios. [Preview Abstract] |
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