Results 51 to 60 of about 569 (189)

Rapid submillimeter QSM and R2* mapping using interleaved multishot 3D‐EPI at 7 and 3 Tesla

Magnetic Resonance in Medicine, Volume 92, Issue 6, Page 2294-2311, December 2024.
Abstract Purpose To explore the high signal‐to‐noise ratio (SNR) efficiency of interleaved multishot 3D‐EPI with standard image reconstruction for fast and robust high‐resolution whole‐brain quantitative susceptibility (QSM) and R2∗$$ {R}_2^{\ast } $$ mapping at 7 and 3T.
Rüdiger Stirnberg, Andreas Deistung, Jürgen R. Reichenbach, Monique M. B. Breteler, Tony Stöcker   +4 more
wiley   +1 more source

First Detections of PN, PO, and PO+ toward a Shocked Low-mass Starless Core

The Astrophysical Journal Letters
Phosphorus is a key element that plays an essential role in biological processes important for living organisms on Earth. The origin and connection of phosphorus-bearing molecules to early solar system objects and star-forming molecular clouds is ...
Samantha Scibelli, Andrés Megías, Izaskun Jiménez-Serra, Yancy Shirley, Jennifer Bergner, Judit Ferrer Asensio, Robin T. Garrod, Mélisse Bonfand, Anissa Pokorny-Yadav   +8 more
doaj   +1 more source

Rapid CNN‐based needle localization for automatic slice alignment in MR‐guided interventions using 3D undersampled radial white‐marker imaging

Medical Physics, Volume 51, Issue 11, Page 8018-8033, November 2024.
Abstract Background In MR‐guided in‐bore percutaneous needle interventions, typically 2D interactive real‐time imaging is used for navigating the needle into the target. Misaligned 2D imaging planes can result in losing visibility of the needle in the 2D images, which impedes successful targeting. Necessary iterative manual slice adjustment can prolong
Jonas Frederik Faust, Axel Joachim Krafft, Daniel Polak, Peter Speier, Nicolas Gerhard Roland Behl, Nathan Ooms, Jesse Roll, Joshua Krieger, Mark Edward Ladd, Florian Maier   +9 more
wiley   +1 more source

The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO). III. Dust and Gas Disk Properties in the Lupus Star-forming Region

The Astrophysical Journal
We present Band 6 and Band 7 observations of 10 Lupus disks around M3-K6 stars from the Atacama Large Millimeter/submillimeter Array survey of Gas Evolution in PROtoplanetary disks (AGE-PRO) Large Program. In addition to continuum emission in both bands,
Dingshan Deng, Miguel Vioque, Ilaria Pascucci, Laura M. Pérez, Ke Zhang, Nicolás Kurtovic, Leon Trapman, Estephani E. TorresVillanueva, Carolina Agurto-Gangas, John Carpenter, Paola Pinilla, Uma Gorti, Benoît Tabone, Anibal Sierra, Giovanni P. Rosotti, Lucas A. Cieza, Rossella Anania, Camilo González-Ruilova, Michiel R. Hogerheijde, James Miley, Dary A. Ruiz-Rodriguez, Maxime Ruaud, Kamber Schwarz   +22 more
doaj   +1 more source

exoALMA XXII: A Two-dimensional Atlas of Deviations from Keplerian Disks

The Astrophysical Journal Letters
Protoplanetary disks are the birthplaces of planetary systems, and deviations from Keplerian rotation imprinted in disk gas kinematics serve as key tracers of physical processes and the presence of protoplanets within disks.
Misato Fukagawa, Andrés F. Izquierdo, Jochen Stadler, Lisa Wölfer, Maria Galloway-Sprietsma, Ryuta Orihara, Masataka Aizawa, Munetake Momose, Daniele Fasano, Myriam Benisty, Richard Teague, Stefano Facchini, Christophe Pinte, Sean M. Andrews, Jaehan Bae, Marcelo Barraza-Alfaro, Gianni Cataldi, Pietro Curone, Ian Czekala, Mario Flock, Himanshi Garg, Cassandra Hall, Jane Huang, John D. Ilee, Jensen Lawrence, Geoffroy Lesur, Giuseppe Lodato, Cristiano Longarini, Ryan A. Loomis, François Ménard, Daniel J. Price, Giovanni Rosotti, Hsi-Wei Yen, Tomohiro C. Yoshida, Gaylor Wafflard-Fernandez, David J. Wilner, Andrew J. Winter, Brianna Zawadzki   +37 more
doaj   +1 more source

Observing Conditions for Submillimeter Astronomy

, 2011
Consistently superb observing conditions are crucial for achieving the scientific objectives of a telescope. Submillimeter astronomy is possible only at a few exceptionally dry sites, notably Mauna Kea, the Antarctic plateau, and the Chajnantor region in the high Andes east of San Pedro de Atacama in northern Chile.
openaire   +3 more sources

Discovery of Radio Recombination Lines from Proplyds in the Orion Nebula Cluster

The Astrophysical Journal
We present new Atacama Large Millimeter/submillimeter Array observations that, for the first time, detect hydrogen and helium radio recombination lines from a protoplanetary disk.
Ryan D. Boyden, Kimberly L. Emig, Nicholas P. Ballering, Charles J. Law, Thomas J. Haworth, Jonathan C. Tan, L. Ilsedore Cleeves, Zhi-Yun Li   +7 more
doaj   +1 more source

Constraints on the Physical Origin of Large Cavities in Transition Disks from Multiwavelength Dust Continuum Emission

The Astrophysical Journal
The physical origin of the large cavities observed in transition disks is to date still unclear. Different physical mechanisms (e.g., a companion, dead zones, enhanced grain growth) produce disk cavities of different depth, and the expected spatial ...
Anibal Sierra, Laura M. Pérez, Benjamín Sotomayor, Myriam Benisty, Claire J. Chandler, Sean Andrews, John Carpenter, Thomas Henning, Leonardo Testi, Luca Ricci, David Wilner   +10 more
doaj   +1 more source

Submillimeter and Far-Infrared Polarimetric Observations of Magnetic Fields in Star-Forming Regions

Frontiers in Astronomy and Space Sciences, 2019
Observations of star-forming regions by the current and upcoming generation of submillimeter polarimeters will shed new light on the evolution of magnetic fields over the cloud-to-core size scales involved in the early stages of the star formation ...
Kate Pattle, Laura Fissel
doaj   +1 more source

Submillimeter Astronomy from the South Pole (AST/RO) [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractThe Antarctic Submillimeter Telescope and Remote Observatory (AST/RO), a 1.7 m diameter offset Gregorian telescope for astronomy and aeronomy studies at wavelengths between 200 and 2000 μm, saw first light in 1995 and operated until 2005. It was the first radio telescope to operate continuously throughout the winter on the Antarctic Plateau. It
openaire   +1 more source