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Дата изменения: Mon Apr 19 20:00:03 2004
Дата индексирования: Sat Dec 22 22:42:09 2007
Кодировка:
Поисковые слова: infrared
Proposal Identi cation No.: A1708 Date Received: 2002-Apr-19 13:54:33
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Galactic
Total Time Requested: 72 Hours
Proposal Title: A SEARCH FOR CH EMISSION FROM DIFFUSE MOLECULAR GAS
ABSTRACT:
Molecular gas, although virtually entirely composed of molecular hydrogen and atomic helium, is detected in the
interstellar medium primarily through the CO(1-0) transition. Most large-scale studies of the molecular cloud
distribution have focussed on this transition, with other molecular species usually relegated to studies of higher
density regions. Although there is no question that the CO(1-0) transition at 115 GHz is an e ective tracer of
translucent and dense molecular gas, there are some problems when this transition is used in regions where
signi cant di use molecular gas may be present. In these regions, the CH hyper ne, main-line, ground state
transition at 3335 MHz may be a more e ective tracer of low-density molecular gas in clouds with visual extinction
less than 1 magnitude. In this proposal we attempt to settle the issue of how e ective the 3335 MHz line really is
in tracing di use molecular gas by making observations in the vicinity of two translucent, high-latitude molecular
clouds.
Name Institution E-mail Phone Student
Loris Magnani The University of
Georgia
loris@milan.physast.uga.edu 706-542-2876 no
Service Observing Request Remot e Observing Request
X None X No
All of the observing run. Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
Atmospheric Observation Instruments:
Description of Observer Equipment: I would like to use the Upper S-band receiver at 3335 MHz
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
2