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Proposal Identification No.:

A2903 Arecibo Observatory

Date Received: 2014-Mar-03 15:38:12 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2014. 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 200 0

less than 100 GB

The Magnetic Morphology of High-Latitude Molecular Cloud MBM 40

Little is known about the formation mechanism of high-latitude molecular clouds (HLMCs), some of the nearest molecular clouds to the Sun. One possibility is that they form in regions where the galactic magnetic field forms magnetic valleys, allowing sufficient column density of neutral gas to accumulate until the gas can begin to self-shield and form molecules. Verschuur (1989) used the 140-foot at Green Bank to detect a +5.5 uG magnetic field in high latitude molecular cloud MBM 40. Existing low resolution observations indicate the gas forms a helical structure in this cloud, which may be a result of the influence of the magnetic field. In that case, we may observe changes in the B-field direction as different sightlines are observed. We propose to map the magnetic field in MBM 40 with the intent of confirming Verschuur's detection as well as gaining some insight as to the morphology of the magnetic field within this cloud. 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 a very cold cloud of molecules high above the disk of the Milky Way. We want to learn how magnetic fields affect the formation of both these clouds and stars and we will use Arecibo to investigate this cosmic mystery.

Name Allison J Smith Tim Robishaw

Institution University of Georgia Dominion Radio Astrophysical Observatory

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

Phone 706 280-8084 250 497-2350

Student G no

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

This work is part of a PhD 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 14:42 ­ 17:28 ­ ­ ­

Days Needed at This Interval 114

Time Constraints (Must Be Justified in the Prop osal Text) none

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
MBM40 ra, dec: 16 05 04.0, +20 41 48, rise,set (LST): 14:42:39, 17:28:44

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