Search Results - "Chael, A."

HIGH-RESOLUTION LINEAR POLARIMETRIC IMAGING FOR THE EVENT HORIZON TELESCOPE by Chael, Andrew A., Johnson, Michael D., Narayan, Ramesh, Doeleman, Sheperd S., Wardle, John F. C., Bouman, Katherine L.

“…ABSTRACT Images of the linear polarizations of synchrotron radiation around active galactic nuclei (AGNs) highlight their projected magnetic field lines and…”
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Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling by Akiyama, Kazunori, Kuramochi, Kazuki, Ikeda, Shiro, Fish, Vincent L., Tazaki, Fumie, Honma, Mareki, Doeleman, Sheperd S., E. Broderick, Avery, Dexter, Jason, Mo cibrodzka, Monika, Bouman, Katherine L., A. Chael, Andrew, Zaizen, Masamichi

“…We propose a new imaging technique for radio and optical/infrared interferometry. The proposed technique reconstructs the image from the visibility amplitude…”
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ON PULSAR DISTANCE MEASUREMENTS AND THEIR UNCERTAINTIES by VERBIEST, J. P. W, WEISBERG, J. M, CHAEL, A. A, LEE, K. J, LORIMER, D. R

“…Accurate distances to pulsars can be used for a variety of studies of the Galaxy and its electron content. However, most distance measures to pulsars have been…”
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Positron Effects on Polarized Images and Spectra from Jet and Accretion Flow Models of M87 and Sgr A by Emami, Razieh, Anantua, Richard, Chael, Andrew A., Loeb, Abraham

“…Abstract We study the effects of including a nonzero positron-to-electron fraction in emitting plasma on the polarized spectral energy distributions and…”
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Closure Statistics in Interferometric Data by Blackburn, Lindy, Pesce, Dominic W., Johnson, Michael D., Wielgus, Maciek, Chael, Andrew A., Christian, Pierre, Doeleman, Sheperd S.

“…Interferometric visibilities, reflecting the complex correlations between signals recorded at antennas in an interferometric array, carry information about the…”
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EHT-HOPS Pipeline for Millimeter VLBI Data Reduction by Blackburn, Lindy, Chan, Chi-kwan, Crew, Geoffrey B., Fish, Vincent L., Issaoun, Sara, Johnson, Michael D., Wielgus, Maciek, Akiyama, Kazunori, Barrett, John, Bouman, Katherine L., Cappallo, Roger, Chael, Andrew A., Janssen, Michael, Lonsdale, Colin J., Doeleman, Sheperd S.

“…We present the design and implementation of an automated data calibration and reduction pipeline for very long baseline interferometric (VLBI) observations…”
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Persistent Non-Gaussian Structure in the Image of Sagittarius A at 86 GHz by Issaoun, S., Johnson, M. D., Blackburn, L., Broderick, A., Tiede, P., Wielgus, M., Doeleman, S. S., Falcke, H., Akiyama, K., Bower, G. C., Brinkerink, C. D., Chael, A., Cho, I., Gómez, J. L., Hernández-Gómez, A., Hughes, D., Kino, M., Krichbaum, T. P., Liuzzo, E., Loinard, L., Markoff, S., Marrone, D. P., Mizuno, Y., Moran, J. M., Pidopryhora, Y., Ros, E., Rygl, K., Shen, Z.-Q., Wagner, J.

“…Abstract Observations of the Galactic Center supermassive black hole Sagittarius A* (Sgr A*) with very long-baseline interferometry (VLBI) are affected by…”
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Evolving non-thermal electrons in simulations of black hole accretion by Chael, Andrew A., Narayan, Ramesh, Sa̧dowski, Aleksander

“…Abstract Current simulations of hot accretion flows around black holes assume either a single-temperature gas or, at best, a two-temperature gas with thermal…”
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Unraveling Twisty Linear Polarization Morphologies in Black Hole Images by Emami, Razieh, Ricarte, Angelo, Wong, George N., Palumbo, Daniel, Chang, Dominic, Doeleman, Sheperd S., Broderick, Avery E., Narayan, Ramesh, Wielgus, Maciek, Blackburn, Lindy, Prather, Ben S., Chael, Andrew A., Anantua, Richard, Chatterjee, Koushik, Marti-Vidal, Ivan, Gómez, Jose L., Akiyama, Kazunori, Liska, Matthew, Hernquist, Lars, Tremblay, Grant, Vogelsberger, Mark, Alcock, Charles, Smith, Randall, Steiner, James, Tiede, Paul, Roelofs, Freek

“…Abstract We investigate general relativistic magnetohydrodynamic simulations to determine the physical origin of the twisty patterns of linear polarization…”
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THE INTRINSIC SHAPE OF SAGITTARIUS A AT 3.5 mm WAVELENGTH by Ortiz-León, Gisela N., Johnson, Michael D., Doeleman, Sheperd S., Blackburn, Lindy, Fish, Vincent L., Loinard, Laurent, Reid, Mark J., Castillo, Edgar, Chael, Andrew A., Hernández-Gómez, Antonio, Hughes, David H., León-Tavares, Jonathan, Lu, Ru-Sen, Montaña, Alfredo, Narayanan, Gopal, Rosenfeld, Katherine, Sánchez, David, Schloerb, F. Peter, Shen, Zhi-qiang, Shiokawa, Hotaka, SooHoo, Jason, Vertatschitsch, Laura

“…ABSTRACT The radio emission from Sgr A is thought to be powered by accretion onto a supermassive black hole of at the Galactic Center. At millimeter…”
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Observing—and Imaging—Active Galactic Nuclei with the Event Horizon Telescope by Fish, Vincent L, Akiyama, Kazunori, Bouman, Katherine L, Chael, Andrew A, Johnson, Michael D, Doeleman, Sheperd S, Blackburn, Lindy, Wardle, John F C, Freeman, William T

“…Originally developed to image the shadow region of the central black hole in Sagittarius A* and in the nearby galaxy M87, the Event Horizon Telescope (EHT)…”
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Reconstructing Video of Time-Varying Sources From Radio Interferometric Measurements by Bouman, Katherine L., Johnson, Michael D., Dalca, Adrian V., Chael, Andrew A., Roelofs, Freek, Doeleman, Sheperd S., Freeman, William T.

“…Very long baseline interferometry (VLBI) makes it possible to recover the images of astronomical sources with extremely high angular resolution. Most recently,…”
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Interferometric Imaging Directly with Closure Phases and Closure Amplitudes by Chael, Andrew A., Johnson, Michael D., Bouman, Katherine L., Blackburn, Lindy L., Akiyama, Kazunori, Narayan, Ramesh

“…Interferometric imaging now achieves angular resolutions as fine as ∼10 as, probing scales that are inaccessible to single telescopes. Traditional synthesis…”
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Metrics and Motivations for Earth-Space VLBI: Time-resolving Sgr A with the Event Horizon Telescope by Palumbo, Daniel C. M., Doeleman, Sheperd S., Johnson, Michael D., Bouman, Katherine L., Chael, Andrew A.

“…Very-long-baseline interferometry (VLBI) at frequencies above 230 GHz with Earth-diameter baselines gives spatial resolution finer than the ∼50 as "shadow" of…”
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Dynamical Imaging with Interferometry by Johnson, Michael D., Bouman, Katherine L., Blackburn, Lindy, Chael, Andrew A., Rosen, Julian, Shiokawa, Hotaka, Roelofs, Freek, Akiyama, Kazunori, Fish, Vincent L., Doeleman, Sheperd S.

“…By linking widely separated radio dishes, the technique of very long baseline interferometry (VLBI) can greatly enhance angular resolution in radio astronomy…”
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Resolved magnetic-field structure and variability near the event horizon of Sagittarius A by Johnson, Michael D., Fish, Vincent L., Doeleman, Sheperd S., Marrone, Daniel P., Plambeck, Richard L., Wardle, John F. C., Akiyama, Kazunori, Asada, Keiichi, Beaudoin, Christopher, Blackburn, Lindy, Blundell, Ray, Bower, Geoffrey C., Brinkerink, Christiaan, Broderick, Avery E., Cappallo, Roger, Chael, Andrew A., Crew, Geoffrey B., Dexter, Jason, Dexter, Matt, Freund, Robert, Friberg, Per, Gold, Roman, Gurwell, Mark A., Ho, Paul T. P., Honma, Mareki, Inoue, Makoto, Kosowsky, Michael, Krichbaum, Thomas P., Lamb, James, Loeb, Abraham, Lu, Ru-Sen, MacMahon, David, McKinney, Jonathan C., Moran, James M., Narayan, Ramesh, Primiani, Rurik A., Psaltis, Dimitrios, Rogers, Alan E. E., Rosenfeld, Katherine, SooHoo, Jason, Tilanus, Remo P. J., Titus, Michael, Vertatschitsch, Laura, Weintroub, Jonathan, Wright, Melvyn, Young, Ken H., Zensus, J. Anton, Ziurys, Lucy M.

“…Near a black hole, differential rotation of a magnetized accretion disk is thought to produce an instability that amplifies weak magnetic fields, driving…”
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Orbital polarimetric tomography of a flare near the Sagittarius A supermassive black hole by Levis, Aviad, Chael, Andrew A., Bouman, Katherine L., Wielgus, Maciek, Srinivasan, Pratul P.

“…The interaction between the supermassive black hole at the centre of the Milky Way, Sagittarius A * , and its accretion disk occasionally produces high-energy…”
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MEASURING THE DIRECTION AND ANGULAR VELOCITY OF A BLACK HOLE ACCRETION DISK VIA LAGGED INTERFEROMETRIC COVARIANCE by Johnson, Michael D., Loeb, Abraham, Shiokawa, Hotaka, Chael, Andrew A., Doeleman, Sheperd S.

“…ABSTRACT We show that interferometry can be applied to study irregular, rapidly rotating structures, as are expected in the turbulent accretion flow near a…”
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European Guideline on Chronic Pruritus In cooperation with the European Dermatology Forum (EDF) and the European Academy of Dermatology and Venereology (EADV) by Weisshaar, Elke, Szepietowski, Jacek C., Darsow, Ulf, Misery, Laurent, Wallengren, Joanna, Mettang, Thomas, Gieler, Uwe, Lotti, Torello, Lambert, Julien, Maisel, Peter, Streit, Markus, Greaves, Malcolm W., Carmichael, Andrew, Tschachler, Erwin, Ring, Johannes, Staenders, Sonja

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Gender and Injury Risk in Incidents of Assaultive Violence by Apel, Robert, Dugan, Laura, Powers, Ráchael

“…This study investigates the situational characteristics that determine the presence and severity of injury in incidents of assaultive violence. The analysis…”
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