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Proposal Identification No.:

A2618

Date Received:

2011-Feb-04 15:17:38

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Regular Astronomy Spectroscopy Galactic 2 Hours 30 min

Testing for stimulated absorption in a molecular cloud by maser emission from

an OH/IR star
ABSTRACT:
Weisberg et al (2005) searched 20 pulsars for OH absorption by foreground molecular clouds. Their only success was with B1641-45, where the 1612, 1665 and 1667 MHz lines were seen to exhibit a signal from the pulsed continuum. This provides a textbook demonstration of stimulated absorption by a continuum flux, while the cloud's pulsed 1720 MHz line is likewise generated as stimulated emission: 1720 MHz emission is thus a diagnostic for this functionality. The OH/IR star IRAS 19224+1454 may be another case, as it exhibits an ~ mJy 1612 MHz 5 absorption feature that coincides with much stronger absorption-like features in its 1665 and 1667 MHz spectra. This proposal seeks to confirm this scenario by detecting the 1720 MHz emission feature in IRAS 19224+1454.

Name Murray Lewis

Institution NA

E-mail blewis@naic.edu

Phone 787 890 5010

Student no

Remote Observing Request

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

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned

2