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Proposal Identification No.: A2712 Date Received: 2012­Mar­01 14:39:12
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Galactic
Total Time Requested: 6.5 Hours
Minimum Useful Time:
Proposal Title: A search for Methanol and excited­state OH masers toward high­mass proto­
stellar cores in the Hi­GAL survey
ABSTRACT:
Only very recently progress has been made toward the identification and study of the earliest phases of high­mass
star formation (HMSF). However, the physical conditions in high­mass starless cores (HMSC) and the exact
evolutionary path from HMSC to massive stars is not well constrained. Previous observational studies suggest that
methanol masers are exclusively associated with early phases of massive star formation. The methanol maser thus
appears as an ideal tool to detect a short­lived phase of HMSF, between the end of the the large scale accretion and
the formation of massive proto­star. We have searched for methanol masers counterparts to the massive cores in
selected fields of the Hi­GAL survey, and found that only a small percentage of high­mass proto­stellar object
(HMPO) are indeed associated with a methanol maser.We therefore propose to use the Arecibo telescope to study
the onset of the methanol maser phase and its precise emergence in the evolutionary sequence from HMS
Name Institution E­mail Phone Student
Luca Olmi UPR­RP and INAF­
OAA (Italy)
olmi.luca@gmail.com no
Remote Observing Request
X Observer will travel to AO
Remote Observing
In Absentia (instructions to oper­
ator)
Instrument Setup
C­high
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
We possibly need protection from RFI currently in the range 5990 to 6020 MHz
2