Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Radford, Simon"'
Publikováno v:
A&A 640, A126 (2020)
Context. Interest in the use of the Chajnantor area for millimeter and submillimeter astronomy is increasing because of its excellent atmospheric conditions. Knowing the general site annual variability in precipitable water vapor (PWV) can contribute
Externí odkaz:
http://arxiv.org/abs/2007.04262
Autor:
Defrance, Fabien, Jung-Kubiak, Cecile, Rahiminejad, Sofia, Macioce, Theodore, Sayers, Jack, Connors, Jake, Radford, Simon, Chattopadhyay, Goutam, Golwala, Sunil
We present the design, simulation, and planned fabrication process of a flat high resistivity silicon gradient index (GRIN) lens for millimeter and submillimeter wavelengths with very low absorption losses. The gradient index is created by subwavelen
Externí odkaz:
http://arxiv.org/abs/1911.09632
Autor:
Otarola, Angel, De Breuck, Carlos, Travouillon, Tony, Matsushita, Satoki, Nyman, Lars-Åke, Wootten, Al, Radford, Simon J. E., Sarazin, Marc, Kerber, Florian, Pérez-Beaupuits, Juan P.
Atmospheric water vapor is the main limiting factor of atmospheric transparency in the mm and submm wavelength spectral windows. Thus, dry sites are needed for the installation and successful operation of radio astronomy observatories exploiting thos
Externí odkaz:
http://arxiv.org/abs/1902.04013
Autor:
Defrance, Fabien, Jung-Kubiak, Cecile, Sayers, Jack, Connors, Jake, deYoung, Clare, Hollister, Matthew I., Yoshida, Hiroshige, Chattopadhyay, Goutam, Golwala, Sunil R., Radford, Simon J. E.
Publikováno v:
Appl. Opt. 57, 5196-5209 (2018)
Although high-resistivity, low-loss silicon is an excellent material for THz transmission optics, its high refractive index necessitates antireflection treatment. We fabricated a wide-bandwidth, two-layer antireflection treatment by cutting subwavele
Externí odkaz:
http://arxiv.org/abs/1803.05168
For a systematic assessment of submillimeter observing conditions at different sites, we constructed tipping radiometers to measure the broad band atmospheric transparency in the window around 350 $\mu$m wavelength. The tippers were deployed on Mauna
Externí odkaz:
http://arxiv.org/abs/1602.08795
Autor:
Sayers, Jack, Zemcov, Michael, Glenn, Jason, Golwala, Sunil R., Maloney, Philip R., Siegel, Seth R., Wheeler, Jordan, Bockstiegel, Clint, Brugger, Spencer, Czakon, Nicole G., Day, Peter K., Downes, Thomas P., Duan, Ran P., Gao, Jiansong, Hollister, Matthew I., Lam, Albert, LeDuc, Henry G., Mazin, Benjamin A., McHugh, Sean G., Miller, David A., Mroczkowski, Tony K., Noroozian, Omid, Nguyen, Hien T., Radford, Simon J., Schlaerth, James A., Vayonakis, Anastasios, Wilson, Philip R., Zmuidzinas, Jonas
We present Sunyaev-Zel'dovich (SZ) effect measurements from wide-field images towards the galaxy cluster RX J1347.5-1145 obtained from the Caltech Submillimeter Observatory with the Multiwavelength Submillimeter Inductance Camera (MUSIC) at 147, 213,
Externí odkaz:
http://arxiv.org/abs/1509.02950
Autor:
Radford, Simon J. E.
Publikováno v:
2011 RevMexAA (SC) 41, 87
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 regio
Externí odkaz:
http://arxiv.org/abs/1107.5633
Cornell University, the California Institute for Technology, and the Jet Propulsion Laboratory are jointly studying the construction of a 25 m diameter telescope for submillimeter astronomy on a high mountain in northern Chile. This Cornell Caltech A
Externí odkaz:
http://arxiv.org/abs/0704.3031
Publikováno v:
Proc. SPIE 6267, 75 (2006)
Cornell, California Institute of Technology (Caltech), and Jet Propulsion Lab (JPL) have joined together to study development of a 25 meter sub-millimeter telescope (CCAT) on a high peak in the Atacama region of northern Chile, where the atmosphere i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610528
Publikováno v:
1997, ApJ 475, L105
High resolution observations of 12CO (2.''3), 13CO (3.''9), and HCN (5.''4) J=1--0 in the galaxy merger Arp 299 (IC 694 and NGC 3690) show the line ratios vary dramatically across the system. The 12CO/13CO ratio is unusually large, 60 +- 15, at the I
Externí odkaz:
http://arxiv.org/abs/astro-ph/9701005