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Proposal Identification No.:

A2760 Arecibo Observatory

Date Received: 2012-Sep-04 05:24:17 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2012. This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Our recent discovery with the Arecibo telescope (A2712) of a previously unknown population of weak (< 0.1Jy) 6.7-GHz methanol masers (toward a sample of Hi-GAL sources) has lent support to the idea that methanol masers may be exclusively associated with the early phases of massive star formation. The final goal of this pro ject is thus to ascertain the true nature of this weak maser population. In particular, we want to determine whether they are indeed associated with an earlier phase during the evolution of high-mass (proto)stars or, rather, they simply represent a different set of excitation conditions in the pumping source. The first step in achieving this goal consists of increasing the number of detected weak maser sources to allow a more robust statistical analysis. Therefore, our main goal with this proposal is to select and observe more Hi-GAL sources in search for further weak 6.7-GHz methanol masers. Outreach Abstract: El proceso de formacion de estrellas similares a nuestro Sol es relativamente bien conocido pero la formacion de estrellas con masa mucho mas alta que la del Sol tiene todavia algunas lagunas, en particular las relacionadas con sus fases iniciales. Por esa razon el descubrimiento de emision "maser" (el equivalente del laser a frecuencias radio) de parte de las moleculas de metanolo durantes las fases tempranas de formacion de estrellas de alta masa es importante, por que puede contribuir a mejorar su estudio. Durante nuestras observaciones anteriores con el telescopio de Arecibo hemos descubierto una "poblacion" de maser de ba ja intensidad. Estas pueden ser asociadas con fases aun mas tempranas de evolucion de estrellas de alta masa. Regular Astronomy Spectroscopy Galactic 14

less than 100 GB

Establishing a larger sample of a newly discovered population of weak 6.7-GHz methanol masers toward high-mass clumps in the Hi-GAL survey

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Name Luca Olmi

Esteban D. Araya

Institution UPR Rio Piedras (PR) and INAF (Italy) Department of Physics Western Illinois University

E-mail olmi.luca@gmail.com

Phone +39-0552752216 (309) 298 1359

Student no

ED-Araya@wiu.edu

no

Additional Authors
P. Hofner, S. Molinari, molinari@ifsi-roma.inaf.it J. Morales, jorge.luis379@gmail.com, Ph.D. student L. Moscadelli, mosca@arcetri.astro.it M. Pestalozzi, michele.pestalozzi@gmail.com

This work is part of a PhD thesis.

Remote Observing Request

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

Section I I - Time Request
The following times are in LST. For these observations night-time is not needed.

Begin ­ End Interval­Interval 18 ­ ­ ­ ­ 21

Days Needed at This Interval 5

Time Constraints (Must Be Justified in the Prop osal Text) 14 hrs cannot be observed in a single run. If the proposal will be accepted, we would like to complete the observations well before the deadline to submit proposals to the EVLA (Feb.1, 2013). This would give us time to include new detections in the EVLA proposal. 2


Section I I I - Instruments Needed
C-high Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
We possibly need protection from RFI currently in the range 5990 to 6020 MHz

Section V - Observing List Target List
See main Proposal

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