TY  - CONF
AU  - Risacher, C.
AU  - Meledin, D.
AU  - Belitsky, V.
AU  - Bergman, P.
PY  - 2009
DA  - 2009//
TI  - First 1.3 THz observations at the APEX telescope
BT  - Proc. 20[super:th] Int. Symp. Space Terahertz Technol.
SP  - 54
EP  - 61
KW  - balanced HEB mixer noise temperature APEX telescope stability Allan variance aperture efficiency
AB  - The Atacama Pathfinder EXperiment (APEX) 12m telescope is operating on the Llano Chajnantor, Chile, since 2003 and a set of state of the art sub-millimeter receivers have been installed for frequencies spanning from 150 GHz to 1500 GHz. In 2008, a balanced 1.3 THz Hot Electron Bolometer (HEB) receiver was installed for the atmospheric window 1250-1380 GHz. This instrument is part of a 4-channel receiver cryostat with the other channels being 211-275 GHz, 275-370 GHz and 380-500 GHz Sideband Separating (SSB) SIS receivers. This paper presents the first observations obtained so far with the 1.3 THz band during its first months of operation. The sky measurements were taken during opportunistic commissioning and science verification phases, when the weather conditions were sufficiently good with a Precipitable Water Vapor (PWV) below 0.25 mm, which was the case only a few nights during these months. We present the first observations of the molecular transition CO J=(11-10) line on different sources such as Orion-FIR4, CW-Leo and SgrB2(M). We describe the many challenges and difficulties encountered for achieving successful THz observations from a large sub-millimeter ground-based telescope.
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ID  - Risacher_etal2009
ER  -