Results 61 to 70 of about 38,151 (299)

The fastscanning observing technique for millimeter and submillimeter astronomy [PDF]

Astronomy & Astrophysics, 2001
Fastscanning is a new observing technique for millimeter and submillimeter astronomy from ground based telescopes. The atmosphere is eliminated by taking advantage of detector arrays. Instead of wobbling the secondary mirror with a fixed frequency of a few Hz to filter the atmospheric contribution, we sample the detector outputs at a much higher rate ...
L. A. Reichertz, B. Weferling, W. Esch, E. Kreysa   +3 more
openaire   +1 more source

RF Magnetron Sputtered Tungsten Disulfide Films: Influence of Target Preparation, Deposition Parameters, and Storage Conditions on Thin Film Stoichiometry

Advanced Materials Interfaces, EarlyView.
Sputtered WS2 films were investigated in terms of their S‐ and O‐concentration depending on deposition power and pre‐sputter time. Chemical and structural investigations were done using EDS, TEM, SEM, AFM, XRD. In general, 20 W films exhibit a wide variation in stoichiometry and structure whereas 80 W films demonstrate a higher S/W ratio than 20 W ...
Theresa Scheler, Pascal Illgner, Thomas Kups, Michaela Blum, Peter Schaaf   +4 more
wiley   +1 more source

PEACHES. IV. Tracing the Formation and Evolution of C2H in Perseus Low-mass Protostars

The Astrophysical Journal
The radical hydrocarbon molecule C _2 H is widely detected in various stages of star and planet formation, and has emerged as a useful tracer of high-C/O gas within the photochemically active surface layers of mature (Class II) protoplanetary disks ...
Jack G. Anderson, Jennifer B. Bergner, Yao-Lun Yang, Yichen Zhang, Nami Sakai   +4 more
doaj   +1 more source

JWST’s PEARLS: A JWST/NIRCam View of ALMA Sources

The Astrophysical Journal Letters, 2023
We report the results of James Webb Space Telescope/NIRCam observations of 19 (sub)millimeter sources detected by the Atacama Large Millimeter Array (ALMA).
Cheng Cheng, Jia-Sheng Huang, Ian Smail, Haojing Yan, Seth H. Cohen, Rolf A. Jansen, Rogier A. Windhorst, Zhiyuan Ma, Anton Koekemoer, Christopher N. A. Willmer, S. P. Willner, Jose M. Diego, Brenda Frye, Christopher J. Conselice, Leonardo Ferreira, Andreea Petric, Min Yun, Hansung B. Gim, Maria del Carmen Polletta, Kenneth J. Duncan, Benne W. Holwerda, Huub J. A. Röttgering, Rachel Honor, Nimish P. Hathi, Patrick S. Kamieneski, Nathan J. Adams, Dan Coe, Tom Broadhurst, Jake Summers, Scott Tompkins, Simon P. Driver, Norman A. Grogin, Madeline A. Marshall, Nor Pirzkal, Aaron Robotham, Russell E. Ryan Jr.   +35 more
doaj   +1 more source

Atmospheric phase correction using CARMA-PACS: high angular resolution observations of the FU Orionis star PP 13S* [PDF]

, 2010
We present 0".15 resolution observations of the 227 GHz continuum emission from the circumstellar disk around the FU Orionis star PP 13S*. The data were obtained with the Combined Array for Research in Millimeter-wave Astronomy (CARMA) Paired Antenna ...
Bock, Douglas C., Bolatto, Alberto D., Carlstrom, John, Carpenter, John M., Culverhouse, Thomas L., Isella, Andrea, Joy, Marshall, Kwon, Woojin, Lamb, James W., Leitch, Erik M., Marrone, Daniel P., Muchovej, Stephen J., Plambeck, Richard L., Pérez, Laura M., Scott, Stephen L., Teuben, Peter J., Woody, David P., Wright, Melvyn C. H., Zauderer, B. Ashley   +18 more
core   +1 more source

MXene‐Coated 3D Printed Horn Antennas for Ku Frequency Band

Advanced Materials Technologies, EarlyView.
An additive manufacturing approach to 3D printing horn antennas and coating them with Ti3C2Tx MXene is proposed. Rapid fabrication of lightweight, high‐performance antennas operating in the Ku‐band (12.4–18 GHz) has been demonstrated. The MXene‐coated antennas exhibit comparable electromagnetic performance to conventional, costly aluminum ones, with ...
Zahra Sarpanah Sourkouhi, Jamal Alhourani, Yury Gogotsi, Mohammad H. Zarifi   +3 more
wiley   +1 more source

Corrugated Silicon Platelet Feed Horn Array for CMB Polarimetry at 150 GHz

, 2010
Next generation cosmic microwave background (CMB) polarization anisotropy measurements will feature focal plane arrays with more than 600 millimeter-wave detectors.
Beall, James A., Becker, Dan, Britton, Joseph W., Cho, Hsiao-Mei, Hilton, Gene C., Hubmayr, Johannes, Irwin, Kent D., Nibarger, John P., Niemack, Michael D., Yoon, Ki Won   +9 more
core   +1 more source

Clustered Star Formation in W75 N [PDF]

, 2002
We present 2" to 7" resolution 3 mm continuum and CO(J=1-0) line emission and near infrared Ks, H2, and [FeII] images toward the massive star forming region W75 N. The CO emission uncovers a complex morphology of multiple, overlapping outflows.
Baart E. E., Cabrit S., D. P. Stark, D. S. Shepherd, Dickel H. R., Ghinassi F., Gredel R., Hildebrand R. H., Hunt L. K., Hunter T. R., Koornneef J., Kramer C., L. Testi, Minier V., Moore T. J. T., Moore T. J. T., Moore T. J. T., Smith M. D., Smith M. D., Suttner G., Vanzi L., Walmsley C. M.   +21 more
core   +3 more sources

Midbrain PAG Astrocytes Modulate Mouse Defensive and Panic‐Like Behaviors

Advanced Science, EarlyView.
Astrocytes in the midbrain periaqueductal gray (PAG) dynamically encode threat intensity and shape defensive action selection in mice. Real‐time Ca2+ imaging reveals robust astrocytic activation during predator odor and CO2 exposure. Aberrant astrocytic Ca2+ overactivation disrupts goal‐directed escape, biases behavior toward freezing, and induces ...
Ellane Barcelon, Kyungchul Noh, Minkyu Hwang, Yoon‐Jung Kim, Unjin Lee, Yeon Joo Ryu, Je‐Kyung Ryu, Sang Beom Jun, Se‐Young Choi, Woo‐Hyun Cho, Sung Joong Lee   +10 more
wiley   +1 more source