Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/ThompsontagA2600tp.pdf Дата изменения: Thu Oct 7 21:14:05 2010 Дата индексирования: Mon Feb 4 23:24:04 2013 Кодировка: Поисковые слова: molecular cloud

Proposal Identification No.:

A2600

Date Received:

2010-Sep-30 19:43:47

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Regular Astronomy Spectroscopy Galactic 200 Hours Hours 2 Hours

Prop osal Title: Are molecular clouds magnetically subcritical or supercritical overall?A survey of Zeeman observations of OH in absorption II. ABSTRACT:
Although much Zeeman work has been done to study the effect of magnetic fields on molecular cloud cores, very little is known about fields in the general envelopes of molecular clouds. Are molecular clouds as a whole magnetically subcritical or supercritical?Using Arecibo, Thompson and Troland have begun the first systematic observational survey to address this question using the Zeeman effect in OH absorption toward extra-galactic continuum sources that lie behind molecular clouds. In this first survey we have studied 7 lines-of-sight. However, the Zeeman effect can only reveal the line-of-sight magnetic field, which makes this study inherently statistical in nature. To obtain statistically meaningful results for this pro ject, we require magnetic field information for more than 7 lines-of-sight. We have identified 26 additional extra-galactic sources. We will chose about 10 of these sources based upon a short survey of OH optical depths and conduct Zeeman observations, spending about 20 hours on each source.

Name Kristen L Thompson

Institution University of Kentucky

E-mail klthomj@uky.edu

Phone 859-321-1776

Student G

Remote Observing Request

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

Instrument Setup
L-wide Atmospheric Observation Instruments:

1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
1420 1612 - 1720

2