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Proposal Identication No.: A1659 Date Received: 2002-Apr-10 16:13:41
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Galactic
Total Time Requested: 72 Hours
Proposal Title: The CO-H2 Conversion Factor in Two Translucent Clouds
ABSTRACT:
The determination of the CO-H2 conversion factor for molecular clouds is one of the most important steps in
deriving the physical properties of these objects. The class of translucent molecular clouds has a variation in the
CO-H2 conversion factor of about an order of magnitude from cloud to cloud and, sometimes, even over a given
cloud. The reasons for this variation are not yet known, but need to be uncovered in order to understand fully the
role these objects play in the ISM. Observations of the main-line, hyperne, ground state transition of CH at 3335
MHz provide a straightforward way to calibrate this conversion factor in translucent clouds. We propose to
observe this line in two translucent clouds, MBM16 and MBM40, in order to understand why the conversion factor
uctuates from point to point in these objects.
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
with the correlator split into 4 sbcs with 2 on each polarization of the 3335 MHz line, 1 on the 3349 MHz
line and the other on the 3264 MHz line.
1

Special Equipment or setup: Nothing special required.
RFI Considerations
Frequency Ranges Planned
2