|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
On the atmospheric limitations of ground-based submillimetre astronomy using array receivers | | E. N. Archibald
; T. Jenness
; W. S. Holland
; I. M. Coulson
; N. E. Jessop
; J. A. Stevens
; E. I. Robson
; R. P. J. Tilanus
; W. D. Duncan
; J. F. Lightfoot
; | | Date: |
26 Apr 2002 | | Journal: | Mon.Not.Roy.Astron.Soc. 336 (2002) 1 | | Subject: | astro-ph | | Affiliation: | 1 and 2), I. M. Coulson , N. E. Jessop , J. A. Stevens (2 and 3), E. I. Robson (1 and 4), R. P. J. Tilanus (1 and 5), W. D. Duncan , J. F. Lightfoot ( JAC, UKATC, MSSL, University of Central Lancashire, NWO | | Abstract: | The calibration of ground-based submillimetre observations has always been a difficult process. We discuss how to overcome the limitations imposed by the submillimetre atmosphere. Novel ways to improve line-of-sight opacity estimates are presented, resulting in tight relations between opacities at different wavelengths. The submillimetre camera SCUBA, mounted on the JCMT, is the first large-scale submillimetre array, and as such is ideal for combatting the effects of the atmosphere. For example, we find that the off-source pixels are crucial for removing sky-noise. Benefitting from several years of SCUBA operation, a database of deep SCUBA observations has been constructed to better understand the nature of sky-noise and the effects of the atmosphere on instrument sensitivity. This has revealed several results. Firstly, there is evidence for positive correlations between sky-noise and seeing and sky-noise and sky opacity. Furthermore, 850-micron and 450-micron sky-noise are clearly correlated, suggesting that 450-micron data may be used to correct 850-micron observations for sky-noise. Perhaps most important of all: if off-source bolometers are used for sky-noise removal, there is no correlation between instrument sensitivity and chop throw, for chop throws out to 180 arcsec. Understanding the effects of submillimetre seeing is also important, and we find that the JCMT beam is not significantly broadened by seeing, nor is there an obvious correlation between seeing and pointing excursions. | | Source: | arXiv, astro-ph/0204444 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER