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Proposal Identification No.: A1902 Date Received: 2004­Feb­02 18:35:12
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 50 Hours
Proposal Title: Rotationally Excited OH Lines in OH Megamaser Galaxies
ABSTRACT:
We propose to observe a flux­limited sample of OH megamaser galaxies for rotationally excited OH absorption lines
at 5 and 6 cm. Observations are designed to provide robust, detailed constraints on the physical environment of
OHMs and on OHM models. Theoretical models will have to contend with not only the ratios between the main 5,
6, and 18 cm transitions, but also with the hyperfine ratios within each OH rotation state. We include a control
sample of 18 cm OH absorption systems to allow us to di#erentiate between properties of interacting starburst
galaxies in general and properties specific to OH megamasers. These multi­use observations will also provide new
constraints on the evolution of the fine structure constant which are complementary to other observations planned
for Arecibo. We propose to observe 11 OHMs and 9 OH absorption systems for 1 hour each in two frequency
settings, for a total time request of 50 hours.
Name Institution E­mail Phone Student
Jeremy Darling Carnegie Observato­
ries
darling@ociw.edu 626 304 0256 no
Service Observing Request Remot e Observing Request
None No
All of the observing run. Maybe
X Part of the observing run. X Yes
Queue Observing
Instrument Setup
C
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
1

Frequency Ranges Planned
3900­4600
4900­6050
2