A Deep CFHT Optical Search for a Counterpart to the Possible Neutron Star — Black Hole Merger GW190814

Posted by klaurent MIT

Kavli Affiliate: Melania Nynka | Summary:We present a wide-field optical imaging search for electromagnetic counterparts to the likely neutron star – black hole (NS-BH) merger GW190814/S190814bv. This compact binary merger was detected through gravitational waves by the LIGO/Virgo interferometers, with masses suggestive of a NS-BH merger. We imaged the LIGO/Virgo localization region using the MegaCam […]


Continue.. A Deep CFHT Optical Search for a Counterpart to the Possible Neutron Star — Black Hole Merger GW190814

Redundant-Baseline Calibration of the Hydrogen Epoch of Reionization Array

Posted by klaurent MIT

Kavli Affiliate: Max Tegmark | First 5 Authors: Joshua S. Dillon, Max Lee, Zaki S. Ali, Aaron R. Parsons, Naomi Orosz | Summary: In 21 cm cosmology, precision calibration is key to the separation of the neutral hydrogen signal from very bright but spectrally-smooth astrophysical foregrounds. The Hydrogen Epoch of Reionization Array (HERA), an interferometer […]


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A Deep Exposure in High Resolution X-Rays Reveals the Hottest Plasma in the $ζ,$Puppis Wind

Posted by klaurent MIT

Kavli Affiliate: David P. Huenemoerder | First 5 Authors: David P. Huenemoerder, Richard Ignace, Nathan A. Miller, Kenneth G. Gayley, Wolf-Rainer Hamann | Summary: We have obtained a very deep exposure (813 ks) of $zeta,$Puppis (O4 supergiant) with the Chandra/HETG Spectrometer. Here we report on analysis of the 1-9 r{A} region, especially well suited for […]


Continue.. A Deep Exposure in High Resolution X-Rays Reveals the Hottest Plasma in the $ζ,$Puppis Wind

Bounds for exit times of Brownian motion and the first Dirichlet eigenvalue for the Laplacian

Posted by klaurent Peking

Kavli Affiliate: Jing Wang | First 5 Authors: Rodrigo Banuelos, Phanuel Mariano, Jing Wang, , | Summary: For domains in $mathbb{R}^d$, $dgeq 2$, we prove universal upper and lower bounds on the product of the bottom of the spectrum for the Laplacian to the power $p>0$ and the supremum over all starting points of the […]


Continue.. Bounds for exit times of Brownian motion and the first Dirichlet eigenvalue for the Laplacian

Towards windproofing LIGO: Reducing the effect of wind-driven floor tilt by using rotation sensors in active seismic isolation

Posted by klaurent MIT

Kavli Affiliate: Richard Mittleman | Summary:Modern gravitational-wave observatories require robust low-frequency active seismic isolation in order to keep the interferometer at its ideal operating conditions. Seismometers are used to measure both the motion of the ground and isolated platform. These devices are susceptible to contamination from ground tilt at frequencies below 0.1 Hz, particularly arising […]


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Towards windproofing LIGO: Reducing the effect of wind-driven floor tilt by using rotation sensors in active seismic isolation

Posted by klaurent Stanford

Kavli Affiliate: Brian Lantz | First 5 Authors: Michael P. Ross, Krishna Venkateswara, Conor Mow-Lowry, Sam Cooper, Jim Warner | Summary: Modern gravitational-wave observatories require robust low-frequency active seismic isolation in order to keep the interferometer at its ideal operating conditions. Seismometers are used to measure both the motion of the ground and isolated platform. […]


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Absorption line abundances in the SMC-like galaxy UGC 5282: evidence for ISM dilution from inflows on kiloparsec scales

Posted by klaurent Chicago

Kavli Affiliate: Donald G. York | First 5 Authors: David V. Bowen, Todd M. Tripp, Edward B. Jenkins, Max Pettini, Doron Chelouche | Summary: We present an HST Cosmic Origins Spectrograph (COS) spectrum of the QSO SDSS J095109.12+330745.8 ($z_{em} = 0.645$) whose sightline passes through the SMC-like dwarf galaxy UGC 5282 ($M_B = -16.0$, $cz […]


Continue.. Absorption line abundances in the SMC-like galaxy UGC 5282: evidence for ISM dilution from inflows on kiloparsec scales

Systematic Phase Curve Study of Known Transiting Systems from Year 1 of the TESS Mission

Posted by klaurent MIT

Kavli Affiliate: Robert F. Goeke | First 5 Authors: Ian Wong, Avi Shporer, Tansu Daylan, Björn Benneke, Tara Fetherolf | Summary: We present a systematic phase curve analysis of known transiting systems observed by the Transiting Exoplanet Survey Satellite (TESS) during year one of the primary mission. Using theoretical predictions for the amplitude of the […]


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NuSTAR and Chandra Observation of the Galactic Center Non-thermal X-ray Filament G0.13-0.11: A Pulsar Wind Nebula Driven Magnetic Filament

Posted by dbos MIT

Kavli Affiliate: Dheeraj Pasham | First 5 Authors: Shuo Zhang, Zhenlin Zhu, Hui Li, Dheeraj Pasham, Zhiyuan Li | Summary: One of the most unique phenomena in the Galactic center region is the existence of numerous long and narrow filamentary structures within a few hundred parsecs of Sgr A$^{star}$. While more than one than one […]


Continue.. NuSTAR and Chandra Observation of the Galactic Center Non-thermal X-ray Filament G0.13-0.11: A Pulsar Wind Nebula Driven Magnetic Filament