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Proposal Identification No.:

A2551

Date Received:

2010-Feb-01 05:17:54

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Galactic 8.5 Hours 1.25

Are Dense Cores Pressure Confined?

Using high sensitivity maps of ammonia emission from star forming cores, we have discovered that the velocity line width of the gas increases sharply (factor of 2) on small scales (0.03 pc) at the core boundary. The cores are quiescent in the interior and turbulent outside. However, we cannot determine whether this transition is dynamically significant without knowledge of the gas density on either side of this sharp transition. Hence, we propose observation of formaldehyde absorption as a direct measurement of the density of molecular gas in the intercore medium. The proposal is submitted to both the Arecibo Radio Telescope to measure the 4.8 GHz line and the GBT to measure the 14.5 GHz resulting in beam matched observations at high resolution (52"=0.06 pc). The line ratio provides an unambiguous diagnostic of the particle density in the region studied.

Name Erik W Rosolowsky

Institution University of British Columbia Okanagan

E-mail erik.rosolowsky@ubc.ca

Phone +12508079623

Student no

Remote Observing Request

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

Instrument Setup
C Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned
4826-4832

2