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Proposal Identification No.:

A2767 Arecibo Observatory

Date Received: 2012-Sep-04 12:59:02 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: Regular Astronomy Spectroscopy Galactic 130

less than 100 GB

Magnetic Fields towards High-Latitude Molecular Clouds

More than 100 molecular clouds detected in CO(1­0) emission are at high Galactic latitudes. We have searched the latest GALFA data cubes to find HI envelopes coincident with 6 of these molecular clouds. We propose to use 130 hours of Arecibo time in an attempt to detect Zeeman splitting of the 21-cm line in the HI envelopes around these 6 high-latitude molecular clouds. While this is a significant investment of time, detections of fields around these molecular clouds would be a ma jor observational step in constraining our understanding of the role magnetic fields play in the transition from atomic to molecular clouds. A reliable upper limit would also be extremely important in restricting the role of magnetic support in cloud evolution. Outreach Abstract: When a radio wave is emitted in the space between stars, a special fingerprint can be left on the radio wave if there was a strong magnetic field in the vicinity of the location where the radio wave comes from. We are looking for this special fingerprint in radio waves that come from very cold clouds of molecules high above the disk of the Milky Way. We want to learn how magnetic fields affect the formation of stars and we will use Arecibo to investigate this cosmic mystery.

Name Allison Smith Timothy Robishaw

Institution University of Georgia, Athens Dominion Radio Astrophysical Observatory

E-mail allison@physast.uga.edu tim.robishaw@nrc-cnrc.gc.ca

Phone 706-5422876 250 497-2350

Student G no

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Additional Authors
Loris Magnani loris@physast.uga.edu Carl Heiles heiles@astro.berkeley.edu

This work is part of a MS thesis.

Remote Observing Request

X

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

Section I I - Time Request
The following times are in LST. For these observations night-time is preferred.

Begin ­ End Interval­Interval 01:50 ­ 04:20 22:00 ­ 00:30 09:30 ­ 12:00 ­

Days Needed at This Interval 20 20 12

Time Constraints (Must Be Justified in the Prop osal Text)

Section I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations

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Frequency Ranges Planned
1420-1720

Section V - Observing List Target List
GALFA274 GALFA257 GALFA242 GALFA311 GALFA050 GALFA104 03:30:02.3 03:08:28.3 02:52:11.3 10:51 48.4 23:10:43.2 23:39:02.3 +06:29:24 +07:34:01 +05:47:33 +24:56:14 +15:20:36 +29:16:02 01:50-03:55 02:26-04:35 02:01-04:17 21:50-00:33 22:04-00:35 09:32-12:12

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