Results 61 to 70 of about 569 (189)

The JCMT Transient Survey: Six Year Summary of 450/850 μm Protostellar Variability and Calibration Pipeline Version 2.0

The Astrophysical Journal
The James Clerk Maxwell Telescope (JCMT) Transient Survey has been monitoring eight Gould Belt low-mass star-forming regions since 2015 December and six somewhat more distant intermediate-mass star-forming regions since 2020 February with the ...
Steve Mairs, Seonjae Lee, Doug Johnstone, Colton Broughton, Jeong-Eun Lee, Gregory J. Herczeg, Graham S. Bell, Zhiwei Chen, Carlos Contreras-Peña, Logan Francis, Jennifer Hatchell, Mi-Ryang Kim, Sheng-Yuan Liu, Geumsook Park, Keping Qiu, Yao-Te Wang, Xu Zhang, The JCMT Transient Team   +17 more
doaj   +1 more source

SO Emission in the Dynamically Perturbed Protoplanetary Disks around CQ Tau and MWC 758

The Astrophysical Journal
We report the serendipitous detection of the SO J _N  = 6 _5 –5 _4 (219.949 GHz) rotational transition in archival Atacama Large Millimeter/submillimeter Array observations of the spiral hosting protoplanetary disks around CQ Tau (with ≈4.9 σ ...
Francesco Zagaria, Haochang Jiang, Gianni Cataldi, Stefano Facchini, Myriam Benisty, Yuri Aikawa, Sean Andrews, Jaehan Bae, Marcelo Barraza-Alfaro, Pietro Curone, Ian Czekala, Daniele Fasano, Cassandra Hall, Iain Hammond, Jane Huang, John D. Ilee, Andrés F. Izquierdo, Jensen Lawrence, Giuseppe Lodato, François Ménard, Christophe Pinte, Giovanni P. Rosotti, Jochen Stadler, Richard Teague, Leonardo Testi, David Wilner, Andrew Winter, Tomohiro Yoshida   +27 more
doaj   +1 more source

Mass Assembly in Massive Star Formation: A Fragmentation Study of ATLASGAL Clumps

The Astrophysical Journal
The mass assembly in star-forming regions arises from the hierarchical structure in molecular clouds in tandem with fragmentation at different scales.
Jagadheep D. Pandian, Rwitika Chatterjee, Timea Csengeri, Jonathan P. Williams, Friedrich Wyrowski, Karl M. Menten   +5 more
doaj   +1 more source

Far-field Pattern Analysis Based on Piecewise Aperture Field Integration for Leighton Chajnantor Telescope Antenna under Gravity and Wind Load

The Astronomical Journal
The Caltech Submillimeter Observatory telescope will be relocated from Mauna Kea, Hawaii to Chajnantor Plateau, Chile, refurbished there and renamed the Leighton Chajnantor Telescope (LCT).
Jia You, Zheng Wang
doaj   +1 more source

Some Problems and Instrumental Features of Submillimeter Astronomy [PDF]

Highlights of Astronomy, 1968
Modern astronomy includes optical, ultraviolet, infrared and, in recent years, radio, γ-ray, and X-ray astronomy. Such a classification is justified to a certain degree. In fact, the difference in wavelength ranges causes a distinction in the methods and techniques of receiving radiation.
openaire   +1 more source

Improved Carbon and Nitrogen Isotopic Ratios for CH3CN in Titan’s Atmosphere Using ALMA

The Planetary Science Journal
Titan, Saturn’s largest satellite, maintains an atmosphere composed primarily of nitrogen (N _2 ) and methane (CH _4 ) that leads to complex organic chemistry.
Jonathon Nosowitz, Martin A. Cordiner, Conor A. Nixon, Alexander E. Thelen, Zbigniew Kisiel, Nicholas A. Teanby, Patrick G. J. Irwin, Steven B. Charnley, Véronique Vuitton   +8 more
doaj   +1 more source

The Proxima Centauri Campaign—First Constraints on Millimeter Flare Rates from ALMA

The Astrophysical Journal
Proxima Centauri (Cen) has been the subject of many flaring studies due to its proximity and potential to host habitable planets. The discovery of millimeter flares from this M dwarf with Atacama Large Millimeter/submillimeter Array (ALMA) has opened a ...
Kiana Burton, Meredith A. MacGregor, Rachel A. Osten, Ward S. Howard, Alycia J. Weinberger, Evgenya Shkolnik, David J. Wilner, Jan Forbrich, Thomas Barclay   +8 more
doaj   +1 more source

Submillimeter and Mid-infrared Variability of Young Stellar Objects in the M17 H II Region

The Astronomical Journal
We conducted a comprehensive analysis of young stellar object (YSO) variability at submillimeter and mid-infrared (mid-IR) wavelengths for the M17 H ii region using 3.5 yr monitoring data from the James Clerk Maxwell Telescope (JCMT) Transient Survey at ...
Zhiwei Chen, Doug Johnstone, Carlos Contreras Peña, Jeong-Eun Lee, Sheng-Yuan Liu, Gregory Herczeg, Steve Mairs, Geumsook Park, Kee-Tae Kim, Mi-Ryang Kim, Keping Qiu, Yao-Te Wang, Xu Zhang, Megan Reiter, The JCMT Transient Team   +14 more
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A Large Molecular Gas Reservoir in the Protocluster SPT2349−56 at z = 4.3

The Astrophysical Journal Letters
We present Atacama Compact Array (ACA) Band-3 observations of the protocluster SPT2349−56, an extreme system hosting >10 ultraluminous infrared galaxies (ULIRGs; L _IR  ≳  10 ^12 L _⊙ ) in a 200 kpc diameter region at z  =  4.3, to study its integrated ...
Dazhi Zhou, Scott C. Chapman, Nikolaus Sulzenauer, Ryley Hill, Manuel Aravena, Pablo Araya-Araya, Jared Cathey, Daniel P. Marrone, Kedar A. Phadke, Cassie Reuter, Manuel Solimano, Justin S. Spilker, Joaquin D. Vieira, David Vizgan, George C. P. Wang, Axel Weiss   +15 more
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Thermal Structure and Millimeter Emission from a Protoplanetary Disk with Embedded Protoplanets from Radiative Transfer Modeling

The Astrophysical Journal
The discovery of protoplanets and circumplanetary disks provides a unique opportunity to characterize planet formation through observations. Massive protoplanets shape the physical and chemical structure of their host circumstellar disk by accretion ...
Felipe Alarcón, Edwin A. Bergin
doaj   +1 more source