231 research outputs found
Student sermon: Cheeseboro
No full textDr. Harry V. Richardson celebrates 20 years of the Interdenominational Theological Seminary through a presentation of its history. He explains how the school was initially funded by the Rockefeller Foundation Sealantic and General Education funds. Dr. Richardson also describes the meetings with Rockefeller foundation representatives including Danna Creel and Dean Rusk. He also discusses meetings with Benjamin E. Mays and Frederick D. Patterson and the importance of original ITC board members and faculty such as Martin Luther King Sr. and Charles B Copher. Also, ITC student Cheeseboro delivers three sermons.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the National Endowment for Humanities - Humanities Collections and Reference Resources Implementation Project Grant in supporting the processing and digitization of a number of its major archival collections as part of the project: Spreading the Word: Expanding Access to African American Religious Archival Collections at the Atlanta University Center Robert W. Woodruff Library.</em
Erratum: Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model [Phys. Rev. D 100, 122002 (2019)]
No full textErratum: Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model [Phys. Rev. D 100, 122002 (2019)
Erratum: First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data [Phys. Rev. D 96, 122006 (2017)]
No full textErratum: First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data [Phys. Rev. D 96, 122006 (2017)]
No full textErratum: Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model [Phys. Rev. D 95 , 122003 (2017)]
No full textResults are presented from a semi-coherent search for continuous gravitational waves from the brightest low-mass X-ray binary, Scorpius X-1, using data collected during the first Advanced LIGO observing run (O1). The search combines a frequency domain matched filter (Bessel-weighted F-statistic) with a hidden Markov model to track wandering of the neutron star spin frequency. No evidence of gravitational waves is found in the frequency range 60-650 Hz. Frequentist 95% confidence strain upper limits (Formula presented). for electromagnetically restricted source orientation, unknown polarization, and circular polarization, respectively
Search For High-Energy Neutrinos From Binary Neutron Star Merger Gw170817 With Antares, Icecube, And The Pierre Auger Observatory
No full textSearch For Continuous Gravitational Waves From Neutron Stars In Globular Cluster Ngc 6544
No full textWe describe a directed search for continuous gravitational waves in data from the sixth LIGO science run. The target was the nearby globular cluster NGC 6544 at a distance of 2.7 kpc. The search covered a broad band of frequencies along with first and second frequency derivatives for a fixed sky position. The search coherently integrated data from the two LIGO interferometers over a time span of 9.2 days using the matched-filtering F-statistic. We found no gravitational-wave signals and set 95% confidence upper limits as stringent as 6.0 X 10^{-25} on intrinsic strain and 8.5 X 10^{-6} on fiducial ellipticity. These values beat the indirect limits from energy conservation for stars with characteristic spindown ages older than 300 years and are within the range of theoretical predictions for possible neutron-star ellipticities. An important feature of this search was use of a barycentric resampling algorithm which substantially reduced computational cost; this method will be used extensively in searches of Advanced LIGO and Virgo detector data
Search For Post-Merger Gravitational Waves From The Remnant Of The Binary Neutron Star Merger Gw170817
No full textGravitational Waves And Gamma-Rays From A Binary Neutron Star Merger: Gw170817 And Grb 170817A
No full textOn 2017 August 17, the gravitational-wave event GW170817 was observed by the Advanced LIGO and Virgo detectors, and the gamma-ray burst (GRB) GRB 170817A was observed independently by the Fermi Gamma-ray Burst Monitor, and the Anti-Coincidence Shield for the Spectrometer for the International Gamma-Ray Astrophysics Laboratory. The probability of the near-simultaneous temporal and spatial observation of GRB 170817A and GW170817 occurring by chance is . We therefore confirm binary neutron star mergers as a progenitor of short GRBs. The association of GW170817 and GRB 170817A provides new insight into fundamental physics and the origin of short GRBs. We use the observed time delay of between GRB 170817A and GW170817 to: (i) constrain the difference between the speed of gravity and the speed of light to be between and times the speed of light, (ii) place new bounds on the violation of Lorentz invariance, (iii) present a new test of the equivalence principle by constraining the Shapiro delay between gravitational and electromagnetic radiation. We also use the time delay to constrain the size and bulk Lorentz factor of the region emitting the gamma-rays. GRB 170817A is the closest short GRB with a known distance, but is between 2 and 6 orders of magnitude less energetic than other bursts with measured redshift. A new generation of gamma-ray detectors, and subthreshold searches in existing detectors, will be essential to detect similar short bursts at greater distances. Finally, we predict a joint detection rate for the Fermi Gamma-ray Burst Monitor and the Advanced LIGO and Virgo detectors of 0.1–1.4 per year during the 2018-01-01–2019 observing run and 0.3–1.7 per year at design sensitivity
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