Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/OtttagA2497tp.pdf Дата изменения: Wed Apr 8 18:54:38 2009 Дата индексирования: Tue Aug 18 09:59:57 2009 Кодировка: Поисковые слова: http astrokuban.info astrokuban

Proposal Identification No.:

A2497

Date Received:

2009-Apr-07 20:00:38

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Short Astronomy Spectroscopy Extragalactic 4 Hours 1 hour

Direct Temperature Measurement of Star Forming Gas at z = 2.5: Ammonia in

the Cloverleaf
ABSTRACT:
We propose to observe the ammonia (1,1), (2,2), and (3,3) inversion lines in the Cloverleaf, a lensed quasar host at z 2.5. The inversion lines of ammonia will be used as an accurate and easy-to-use thermometer of the dense molecular gas. This will allow us to break the notorious temperature-density degeneracy that hampers the interpretation of rotational lines from linear molecules such as CO. The proposed observations will not only allow us to make one of the first direct temperature measurements of dense molecular, star forming gas at that redshift, but it would also be the highest redshift ammonia detection by far. The same observations will allow us to search for the redshifted water maser line, a potential tracer of the accretion disk of the central black hole within the Cloverleaf. The incredible collecting area, outstanding receiver performance at the redshifted 6.7 GHz frequency, as well as the versatility of the WAPPs make Arecibo the only telescope in the world to perform this experiment.

Name Juergen A Ott

Institution NRAO

E-mail jott@nrao.edu

Phone 575-835-7174

Student no

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Instrument Setup
C-high Atmospheric Observation Instruments:

Sp ecial Equipment or setup: Cooled C-band high receiver requested. 1


RFI Considerations Frequency Ranges Planned
6100-6900

2