Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/management/atuc/2005dec/docs/6.0_ATUC_115Ghz.pdf Дата изменения: Fri Nov 25 07:20:52 2005 Дата индексирования: Sun Jun 27 14:35:04 2010 Кодировка: Поисковые слова: внешние планеты

Stating the Obvious ATCA 115 GHz upgrade
Tony Wong 30 November 2005
Thanks to: G. Carrad, G. Moorey · CO is at least 8x brighter than any other thermal molecular line in almost all celestial sources. · CO traces gas at lower densities that simply wouldn't emit in other molecular lines. · Nobody builds a 3mm spectroscopic instrument that can't observe CO. · We originally thought a single MMIC receiver couldn't cover 85-115 GHz. · The Mopra receiver now covers 77-117 GHz.

Mopra MMIC receiver

Science case
· Redshifted CO: remove all existing redshift gaps except 0.5

Redshifted CO
Pros
· · · ·

Pros & Cons
Implement lessons learned from developing current system Realise full potential of MNRF1997; increase scientific interest at home and overseas Possibility of doing real survey science (disks, ULIRGs) Increased complementarity with Chilean sub-mm telescopes, which will observe higher CO transitions Resource conflict with 7mm upgrade; can't start until 2007 Limitations of Narrabri site (atmosphere) Limitations of antennas (efficiency, pointing) ALMA (early science 2008?)

Current system

Expanded system

Cons
· · · ·

courtesy Ilana Klamer

Resources
· Rough estimate: 5.7 person-years, $545k · Technical problems already solved on Mopra. · Machining components seems to be limiting factor timewise: about 1 yr. · MMIC LNA's already in hand. · Additional time needed for installation, in order to minimise disruption to 7mm & 12mm observing. · Could start in mid-2007 and finish in late 2008.

Request for ATUC
· Need firm backing from ATUC that this is highly desirable
­ Not trying to derail 7mm project ­ Shouldn't clash with broadband L/S upgrade ­ 7mm system is $6M; this is $0.5M

· Advice on funding sources: ARC or international partners? · Advice on how closely this should be tied to ALMA progress - would there still be demand for this post-ALMA?