Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/PeektagA2586tp.pdf Дата изменения: Wed Jun 9 00:20:47 2010 Дата индексирования: Fri Feb 11 17:39:45 2011 Кодировка: Поисковые слова: ацобс бфмбофйюеулбс бопнбмйс

Proposal Identification No.:

A2586

Date Received:

2010-Jun-01 15:14:43

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Regular Astronomy Spectroscopy Galactic 90 Hours 1 hour

Detailed Investigations of Anomalous Compact Clouds: Magnetic Fields and

Molecules
ABSTRACT:
We have detected many very cold, marginally resolved clouds with the GALFA-HI survey. We have followed these up with both the VLA and the Arecibo 305m. We find them to be very compact, with cold cores at about T= 20K, and core sizes <30". Perhaps more impressively, the short pilot pro ject using Arecibo turned up an extremely strong magnetic field of about 14 microGauss via Zeeman splitting in one cloud. This implies very strong magnetic pressures of near 180,000 /cm3 K, dwarfing the standard thermal, turbulent, cosmic ray and magnetic pressures of the ISM combined. This result flies in the face of the standard picture of the cold neutral medium, which states that most of the gas is in pressure equilibrium near 3500 /cm3 K. We wish to both confirm this result at a higher signal-to-noise as well as attempt to detect magnetic fields and molecules (OH) in small group of similar clouds.

Name Joshua E. Peek

Institution Columbia University

E-mail goldston@gmail.com

Phone 510 299 4427

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

RFI Considerations
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Frequency Ranges Planned
1420-1421 1665-1666 1667-1668 1612-1613

This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST.

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