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Proposal Identification No.:

A2855

Date Received:

2013-Sep-03 08:08:13

Technical Page
This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Regular Astronomy Spectroscopy Galactic 26 Hours 2hr

The evolution of massive Hi-GAL clumps towards high-mass stars: constraints on physical parameters from the H2CO 6-cm transition
ABSTRACT:
The Hi-GAL survey gives us a unique opportunity to study the process by which molecular clouds condense into clumps and cores, and then into massive stars. Our recent discovery with the Arecibo telescope (A2712) of a previously unknown population of low-brightness (< 0.1Jy) 6.7-GHz methanol masers in a sample of Hi-GAL massive clumps, has lent support to the idea that methanol masers may be exclusively associated with the early phases of massive star formation. We now want to further study these ob jects by constraining their physical and kinematical parameters. We thus propose to use the 6-cm H2CO K-doublet transition and the beam-matched 2-cm transition (with the GBT) in order to derive the density in these sources. Other kinematical data will be obtained by observing various RRLs. We will also search for the uncommon H2CO 6-cm emission and for variability in the already observed 6.7-GHz weak methanol masers.

Name Luca Olmi

Institution UPR-RP and INAFOAA

E-mail olmi.luca@gmail.com

Phone

Student no

Remote Observing Request

X

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

Instrument Setup
C Atmospheric Observation Instruments:

1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
4829 - 4877 MHz

2