Results 11 to 20 of about 3,081 (186)

Multimode horn antennas for far-infrared astronomy [PDF]

The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
Multi-mode horns combined with bolometric or incoherent detectors are finding application in astronomical receivers for which partially coherent operation can provide increased throughput and thus sensitivity. This is advantageous when observing faint sources, especially if diffraction limited resolution is not required, or if the horn beam is ...
Murphy J. A., Bracken C., Doherty S., McAuley I., Wilson D., O'Sullivan C., Trappe N., Gradziel M., Ade P., Gleeson E., Maffei B., Lamarre J. -M., Noviello F., Peacocke T., Pisano G., Puget J. -L., Savini G., Sudiwala R., Withington S., Wylde R., Yurchenko V.   +20 more
openaire   +3 more sources

Astrochemistry With the Orbiting Astronomical Satellite for Investigating Stellar Systems

Frontiers in Astronomy and Space Sciences, 2022
Chemistry along the star- and planet-formation sequence regulates how prebiotic building blocks—carriers of the elements CHNOPS—are incorporated into nascent planetesimals and planets.
Jennifer B. Bergner, Yancy L. Shirley, Jes K. Jørgensen, Brett McGuire, Brett McGuire, Susanne Aalto, Carrie M. Anderson, Gordon Chin, Maryvonne Gerin, Paul Hartogh, Daewook Kim, Daewook Kim, David Leisawitz, Joan Najita, Kamber R. Schwarz, Alexander G. G. M. Tielens, Alexander G. G. M. Tielens, Christopher K. Walker, David J. Wilner, Edward J. Wollack   +19 more
doaj   +1 more source

Probing the Nature of the First Galaxies with JWST and ALMA

The Astrophysical Journal Letters, 2023
By implementing a model of primordial dust emission, we predict dust-continuum fluxes for massive galaxy sources similar to those recently detected by James Webb Space Telescope (JWST) at z ≳ 7.
María Emilia De Rossi, Volker Bromm
doaj   +1 more source

Pushing The Limits of Mid-Wave Infrared Detection with Superconducting Nanowire Single-Photon Detectors [PDF]

EPJ Web of Conferences
Extending single-photon detection capabilities into the mid- infrared is expected to have far-reaching implications for long-wavelength quantum optics, quantum and free-space communication, astronomy, environmental monitoring, and fundamental molecular ...
Oksenberg Eitan, Gourgues Ronan, Meder Steffen, Zöllner Jona, Los Johannes W. N., Finley Jonathan, Castaneda Mario   +6 more
doaj   +1 more source

Exploring the Magnetic Field Geometry in NGC 891 with SOFIA/HAWC+

The Astronomical Journal, 2023
Stratospheric Observatory For Infrared Astronomy/High-resolution Airborne Wideband Camera-plus 154 μ m Far-Infrared polarimetry observations of the well-studied edge-on galaxy NGC 891 are analyzed and compared to simple disk models with ordered (planar ...
Jin-Ah Kim, Terry Jay Jones, C. Darren Dowell   +2 more
doaj   +1 more source

New Water Oxidation Mechanism in Photosystem II Resolves Major Experimental Controversies

Angewandte Chemie, EarlyView.
In Photosystem II Oxygen Evolving Complex, we discovered the O3‐O6 peroxide at lower energy. Assignment of the O3 ligated by histidine (His337) as a slow exchanging substrate and its coupling with O6 give the O─O bond formation mechanism most consistent with all currently available experimental data. Proposal shows how protein environment can steer the
Yulia Pushkar
wiley   +2 more sources

Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula

The Astronomical Journal, 2022
The persistence of planetary systems after their host stars evolve into their post-main-sequence phase is poorly constrained by observations. Many young white dwarf systems exhibit infrared excess emission and/or spectral absorption lines associated with
Jonathan P. Marshall, Steve Ertel, Eric Birtcil, Eva Villaver, Francisca Kemper, Henri Boffin, Peter Scicluna, Devika Kamath   +7 more
doaj   +1 more source

A Rotating Accretion Disk around MWC 297, a Young B1.5Ve Star

The Astronomical Journal, 2023
High-resolution spectra with iSHELL on IRTF in the K and M bands of the young, heavily accreting B1.5Ve star MWC 297 show numerous double-peaked CO lines. These CO lines originate in an inclined gaseous disk in Keplerian rotation.
Göran Sandell, William Vacca
doaj   +1 more source

Two bolometer arrays for far-infrared and submillimeter astronomy [PDF]

SPIE Proceedings, 2004
We describe the development, construction, and testing of two 384 element arrays of ion-implanted semiconducting cryogenic bolometers designed for use in far-infrared and submillimeter cameras. These two dimensional arrays are assembled from a number of 32 element linear arrays of monolithic Pop-Up bolometer Detectors (PUD) developed at NASA/Goddard ...
Silverberg, R. F., Allen, C. A., Babu, S. R., Benford, D. J., Chuss, D. T., Dotson, J. L., Dowell, C. D., Harper, D. A., Jhabvala, M. D., Loewenstein, R. F., Moseley, S. H., Staguhn, J. G., Voellmer, G., Wollack, E. J.   +13 more
openaire   +2 more sources

Cross-slot metal-mesh bandpass filters for far-infrared astronomy

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 2022
The far-infrared (IR) region is rich with information needed to characterize interstellar dust and to investigate the cold outer planets of the solar system and their icy moons. The proposed sub-orbital observatory the Balloon Experiment for Galactic INfrared Science (BEGINS) will utilize cryogenic instruments to map spectral energy distributions (SEDs)
Perido, Joanna, Denis, Kevin, Glenn, Jason, Cothard, Nicholas F., Quijada, Manuel, Patel, Jessica, Wollack, Edward, Hewagama, Tilak, Aslam, Shahid, Day, Peter K.   +9 more
openaire   +2 more sources