Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/PandiantagA1859tp.ps Дата изменения: Fri Jan 23 18:21:10 2004 Дата индексирования: Sat Dec 22 22:43:50 2007 Кодировка: Поисковые слова: star

Proposal Identication No.: A1859 Date Received: 2004-Sep-29 11:19:38
Technical Page
Proposal Type: Long-term
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Galactic
Total Time Requested: 400 Hours
Proposal Title: A Large Survey for Methanol Masers
ABSTRACT:
The 5 1 6 0 A + methanol line at 6.668 GHz discovered by Menten (1991) is the brightest of the methanol maser
transitions. It is also the second brightest maser line ever observed with the peak ux density of the brightest
source being over 5000 Jy. Theoretical and observational studies so far suggest that these masers are precursors of
ultracompact HII regions, and are excellent tracers of sites of high-mass star formation. Since high-mass star
formation occurs preferentially in the spiral arms of our galaxy, methanol masers are potential candidates for
tracing spiral arm structure. To this end, we propose making a large blind survey for methanol masers in a portion
of the galactic plane visible from Arecibo. Such a survey will also yield a large sample of methanol masers from
which properties including the methanol maser luminosity function can be deduced. In addition to giving an
excellent candidate list of new ultracompact HII regions in the surveyed region, this work will also be a prelude to
extensive VLBI studies probing the dynamics of high-mass star forming regions.
Name Institution E-mail Phone Student
Jagadheep D. Pandian Cornell University jagadheep@astro.cornell.edu 607 255 6472 G
Service Observing Request Remot e Observing Request
X None No
All of the observing run. X Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
Atmospheric Observation Instruments:
Special Equipment or setup: none
1

RFI Considerations
Frequency Ranges Planned
band around 6.668 GHz
2