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Atmospheric Transmission at Dome C between 0 and 10 THz

Published online by Cambridge University Press:  24 December 2009

L. Spinoglio ,
N. Epchtein ,
N. Schneider ,
V. Minier ,
G. Durand ,
P. Tremblin ,
J. Urban  and
P. Baron
N. Schneider
Affiliation:
IRFU/SAp CEA/DSM, Lab. AIM CNRS, Université Paris Diderot, Gif-sur-Yvette, France
V. Minier
Affiliation:
IRFU/SAp CEA/DSM, Lab. AIM CNRS, Université Paris Diderot, Gif-sur-Yvette, France
G. Durand
Affiliation:
IRFU/SAp CEA/DSM, Lab. AIM CNRS, Université Paris Diderot, Gif-sur-Yvette, France
P. Tremblin
Affiliation:
IRFU/SAp CEA/DSM, Lab. AIM CNRS, Université Paris Diderot, Gif-sur-Yvette, France
J. Urban
Affiliation:
Chalmers University of Technology, Dep. of Radio and Space Science, Göteborg, Sweden
P. Baron
Affiliation:
National Insitute for Information and Communication, Koganei, Japan
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Abstract

We present model calculations of the atmospheric transmission for DOME C in Antarctica for frequencies up to 10 THz (30 μm) using the forward model MOLIERE-5. Measurements of precipitable water vapor (pwv), obtained by the SUMMIT radiometer installed at the Concordia station during 2008 and working at a wavelength of 200 μm, are translated into atmospheric transmission using MOLIERE. Quartiles of transmission, calculated from 200 μm data are extrapolated to 350 μm and compared to the CCAT (Cornell-Caltech Atacama Telescope) site in Chile. It turns out that for 25% of the time at DOME C (CCAT), the transmission is around 20% (5%) at 200 μm. This corresponds to a pwv of 0.18 mm for DOME C. At 350 μm, for 50% of time at DOME C (CCAT) the transmission is around 55% (25%). This corresponds to a pwv of 0.22 mm for DOME C. These results show that DOME C is one of the best observing sites on Earth for submm-astronomy with respect to high atmospheric transmission over long time periods.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 40: 3rd ARENA Conference: An Astronomical Observatory at CONCORDIA (Dome C, Antarctica) , 2010 , pp. 327 - 332
Copyright
© EAS, EDP Sciences, 2010

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