Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/TrolandtagA2470tp.pdf Дата изменения: Mon Feb 9 20:59:26 2009 Дата индексирования: Tue Aug 18 11:32:06 2009 Кодировка: Поисковые слова: molecular cloud

Proposal Identification No.:

A2470

Date Received:

2009-Feb-01 19:10:29

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

Prop osal Title: Are molecular clouds magnetically subcritical or supercritical overall?A survey of Zeeman observations of OH in absorption ABSTRACT:
Although much Zeeman effect work has been done on the cores of molecular clouds, very little is currently known about magnetic fields outside the cores where most of the molecular gas resides. Are molecular clouds as a whole magnetically subcritical (magnetically dominated) or are they magnetically supercritical?The answer bears upon the origin and evolution of molecular clouds before cores form within them. We propose the first systematic observational survey of this question using the Zeeman effect in OH absorption lines toward extra-galactic continuum sources that lie behind molecular clouds. We have identified a sample of 25 such sources. We propose to conduct short test observations of these sources to measure OH optical depths toward them. Then we will choose about 10 of the sources and conduct Zeeman effect observations, spending an average of about 20 hours of telescope time on each.

Name Thomas H Troland

Institution University of Kentucky

E-mail troland@pa.uky.edu

Phone 859 257-8620

Student no

Remote Observing Request

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

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none 1


RFI Considerations Frequency Ranges Planned

2