Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/WeisbergtagP1329tp.ps Дата изменения: Tue Feb 25 22:14:50 2003 Дата индексирования: Sat Dec 22 23:14:49 2007 Кодировка:

Proposal Identication No.: PulsarsP1329 Date Received: 2000-99-Jun-01 17:19:36
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Pulsars
Sub-Category: Pulsars
Observation Category:
Total Time Requested: 40 - see below Hours
Proposal Title: Pulsar Distance and Galactic Electron Density WeisbergDeterminations via 21
cm Absorption Measurements
ABSTRACT:
We propose to measure neutral hydrogen absorption spectra of distant pulsars. We will use these spectra and a
galactic rotation model to kinematically determine the pulsar distances. The measured distance and dispersion
measure together yield the mean electron density along the line of sight. These measurements will be used to
calibrate galactic electron density models, which are essential for pulsar population studies.
Name Institution E-mail Phone Student
Joel M Weisberg Carleton College
Physics and Astron-
omy
jweisber@carleton.edu 507 646-4367 no
I NA want to do remote observing.
Instrument Setup
L-wide
Atmospheric Optical Instruments:
Special Equipment or setup: We did test obs. June 1998 and prelim. production obs. Dec 1998 (4
days; 17-21 hr LST). The Caltech Baseband Recorder Backend had serious problems in December (One
of two tapedrives and one of two IFs down, with the former xed by Phil and Arun at great eort and
the latter unxable by Andy Dowd with great eort and no schematics or spares), so little of the data
are useful. We are now preparing to begin again. We will develop better advance communication with
the Caltech group concerning maintenance and spares, or else we will choose a dierent backend such as
the AOFTM (Arecibo Observatory Fourier Transform Machine, which was not working when we chose
to use the CBR in June 1998).
RFI Considerations
Frequency Ranges Planned
not given
1