منابع مشابه
Alma Observations of Starless Core Substructure in Ophiuchus
Compact substructure is expected to arise in a starless core as mass becomes concentrated in the central region likely to form a protostar. Additionally, multiple peaks may form if fragmentation occurs. We present ALMA Cycle 2 observations of 60 starless and protostellar cores in the Ophiuchus molecular cloud. We detect eight compact substructures which are > 15 from the nearest Spitzer YSO. On...
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This memo investigates the properties of atmospheric turbulence above the ALMA site using measurements from the Water Vapour Radiometers (WVRs), in particular testing the Kolmogorov turbulence model and searching for evidence of an outer length scale. We fit model power-spectral density (PSD) curves to the measured power spectra for a number of observations and extract the slope, the amplitude ...
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Atmospheric water vapor emits strongly at millimeter wavelengths. Fast temporal and spatial fluctuations in the atmospheric water vapor results in problems in removing the atmospheric emission, which is done by very quick position switching or beam switching. Most phase fluctuations seen with the 11.2 GHz site testing interferometer are due to fluctuations in water vapor, so we can use the stat...
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The precision imaging to be attained by the ALMA will be achieved through accurate calibration. The types of calibration are summarized in Table 3.1. Table 3.1 ALMA Calibration Requirements. Pointing 0.6" absolute Primary Beam 2-3% Baseline Determination 0.1 mm Flux Calibration 1% absolute flux accuracy goal Phase Calibration 0.15 radian at 230 GHz Bandpass Calibration 10000:1 to 100000:1 Polar...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2014
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201425189