Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/O'NeiltagA1399tp.ps Дата изменения: Mon Apr 19 19:59:32 2004 Дата индексирования: Sat Dec 22 21:56:54 2007 Кодировка: Поисковые слова: crater

Proposal Identication No.: A1399 Date Received: 2000-Jan-31 11:23:43
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 10 Hours
Proposal Title: H I Envelopes and the Impact Parameters of Low Surface Brightness Galaxies
ABSTRACT:
Lyman- absorption lines are potentially extremely powerful probes of gas in and around galaxies, yet no general
connection has been conclusively made between these lines and physical objects. Recent computer simulations have
indicated that a signicant fraction of low-redshift Lyman- absorption lines can be attributed to nearby low
surface brightness galaxies. If this scenario is correct, Lyman- lines could be used not only to probe the
exceptionally diuse outer regions of these galaxies but could potentially result in the discovery of new,
exceptionally diuse stellar systems. For the simulations to be correct, though, it must be shown that the gaseous
component of low surface brightness galaxies extend well beyond their optical diameters. We propose to test this by
probing a 7.2' diameter region around four low surface brightness galaxies in the nearby universe for extended H I
emission. To do this, we request a total of 10 hours observation time using the L-narrow receiver on the the Arecibo
Gregorian system. This project will be undertaken as a REU student summer project.
Name Institution E-mail Phone Student
Karen L O'Neil Arecibo Observatory koneil@naic.edu (787) 878-
2612, x326
no
Instrument Setup
L-narrow
Atmospheric Optical Instruments:
Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1390 { 1420 Mhz
1