Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/HeilestagA2052tp.pdf Дата изменения: Mon Jul 11 02:41:33 2005 Дата индексирования: Sat Dec 22 22:47:03 2007 Кодировка: Поисковые слова: millennium

Proposal Identification No.:

A2052

Date Received:

2005-

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Galactic 71 Hours

The thinnest cold HI clouds in the diffuse ISM

Recent observations with the Westerb ork and Arecib o radio telescop es revealed several cold HI clouds with the p eak optical depth of only 0.1% and with the HI column densities of ab out 3 в 1017 cm-2 ; these are the lowest column densities ever detected for cold neutral features in the ISM. The purp ose of this prop osal is to investigate how common these features are in the ISM, by p erforming a deep survey in HI absorption for a set of 23 sources with no previously known absorption features. We will use the observing and data reduction schemes develop ed recently by Heiles and Troland for their Millennium Arecib o survey. In total we ask for 71 hours of telescop e time.

Name Carl Heiles

Institution UC Berkeley

E-mail sstanimi@astro.berkeley.edu

Phone 510 642 4510

Student no

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing X

No Maybe Yes

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
1


1415-1425

2