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Proposal Identification No.:

A2302

Date Received:

2007-Feb-01 17:03:45

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Regular Astronomy Spectroscopy Galactic 6 Hours 1 hour

A Survey for Thermal CH3 OH 6.7 GHz Emission toward Massive Star Forming

Regions
ABSTRACT:
Massive stars form in dense molecular cores where the intense radiation field from young massive proto-stellar ob jects heats the surrounding molecular material, producing a rich spectrum of molecular transitions. We have successfully used thermal CH3 OH 44 GHz emission to study the gas kinematics in the G31.41+0.31 hot molecular core with the VLA. However, the CH3 OH 44 GHz line is not a convenient probe because the observations are strongly affected by tropospheric water vapor. In contrast, the CH3 OH 6.7 GHz transition would be a better probe because atmospheric instabilities are substantially less significant at cm wavelengths. In addition, in the near future the new EVLA receivers will enable observations of the CH3 OH 6.7 GHz transition with excellent imaging fidelity (u-v coverage) and sensitivity. Thus, we propose to conduct an Arecibo survey for thermal CH3 OH 6.7 GHz emission toward a sample of 10 massive star forming region to select candidates for future EVLA sub-arcsecond angular resolution studies. Arecibo is the ideal instrument for this pro ject given its large collecting area and the availability of the C-Band High receiver.

Name Esteban D Araya

Institution New Mexico and NRAO

Tech

E-mail earaya@nrao.edu

Phone 505 835 7095

Student G

Remote Observing Request

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

Instrument Setup
C-high Atmospheric Observation Instruments: 1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
6660 - 6680

2