Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/pub/people/jreynold/proposals/H2O/lba_98mayt_cvr.ps.gz Дата изменения: Tue Feb 17 07:35:19 1998 Дата индексирования: Fri Dec 28 11:13:58 2007 Кодировка: Поисковые слова: ngc 4945

VLBI
yr,term: 98MAYT
ATNF use
ident:
rcvd:
AUSTRALIA TELESCOPE OBSERVING APPLICATION
LBA/VLBI/APT
SEND TO: Director, ATNF, P.O. Box 76, Epping, NSW 2121, Australia
For ATNF information see: http://www.atnf.csiro.au
For Guides to VLBI/LBA Observations see: http://wwwatnf.atnf.csiro.au/Documentation/vlbi
1. Title of proposal:
Accretion Disks and Outflows in Circinus & NGC 4945
2. Authors Institution/Country for Ph.D. Present at
Principal investigator on line 1 (if not Australia) thesis? which site ?
L. J. Greenhill/J. M. Moran Harvard­Smithsonian CfA
J. R. Herrnstein/P. J. Diamond NRAO
R. P. Norris/J. E. Reynolds ATNF Parkes
S. Ellingsen/P. M. McCulloch Univ. of Tasmania Hobart
D. L. Jauncey/A. K. Tzioumis ATNF Tid, Mopra
R. S. Booth OSO
3. Contact author and mailing address: L. Greenhill
60 Garden St, Cambridge, MA 02138, USA
phone: +1 617 495 7194 FAX: +1 617 495 7345 e­mail: greenhill@cfa.harvard.edu
4. Continuation of previous proposal? NO Previous proposal no:
Related ATNF proposal numbers (if any): V076, V093
5. Scientific categories: Solar System Stellar Galactic Mag. Clouds \Theta Extragalactic
6. Type of observation: \Theta LBA/VLBI APT Lin pol \Theta Cir pol Point source
\Theta Continuum \Theta Spectral line \Theta Imaging Pulsar Monitoring Astrometry
7. Are simultaneous CA observations required? NO (If YES, provide additional justification)
8. Observing band(s): 1.3 cm
9. Total requested time (hrs/days):16 h \Theta 2 d & 18 h \Theta 2 d Minimum useful time 16 h \Theta 1 d & 18 h \Theta 2 d
Time to complete project (include above): Same Time allocated so far: 0
10. Any publications to date from this proposal? N (If YES, please list separately)
11. Short summary of proposal (ё150 words, mimimum font size 8 point):
When your proposal is scheduled the contents of this application form (but not supporting material) will be made public.
This L A T E X form was generated by the author on February 16, 1998
lba applic.tex
VLBI observations of extragalactic H 2 O masers have been used to probe the sub­parsec scale structure and dynamics of several active
galaxies, notably NGC 4258. Here, we propose to use the LBA and the VLBA Mauna Kea antenna to generate the highest sensitivity,
highest angular resolution synthesis maps yet of the prominent masers in NGC 4945 and the Circinus galaxy. Preliminary observations
of both masers show evidence for rotating (accretion) disk structures and massive central engines. The proposed observations will
provide an opportunity to test and refine these models. In Circinus, strong maser emission coincides roughly with the axis of the disk
and is significantly offset from the disk. This arrangement is valuable because the physical relationship between outflows and disks in
AGN is poorly understood. The maser emission and proximate compact continuum emission, which we will observe as well, will permit
detailed analysis. Winter observation is especially important for 1 cm observations of these weak sources.
Alternate -- Water masers are captivating and we cannot get enough. Besides, 1 cm VLBI is easy so why not keep at it?

VLBI
Title of Proposal: Accretion Disks and Outflows in Circinus & NGC 4945
18. Please indicate the amount of additional help required:
\Theta None Consultation Friend (Epping: initial assistance with data reduction)
Observing assistance Staff Collaborator
N.B. The proposer is responsible for organising support in consultation with the VLBI scheduler.
13. Spectroscopy only: Line 1 Line 2 Line 3
transitions to be observed H 2 O
velocity range (km s \Gamma1 ) 200--800
channel bandwidth (kHz) 15.6
approx observing frequency 22200 MHz
number of channels per baseline 2048
number of pol products (1,2 or 4) 1
14. Interferometry: S­2 \Theta MkIII mode
Antennas requested: Consult VLBI scheduler for availability
Parkes 64­m \Theta
CA 1 x 22m
CA 6 x 22m
Mopra 22m \Theta
Tidbinbilla
DSS43 70m \Theta
DSS45 34m
DSS42 34m
Hobart 26m \Theta
Ceduna 30m
Perth 15m
Hartebeesthoek
APT (Specify telescopes below)
OTHER telescopes or networks (specify):
e.g. VLBA­MK \Theta
** Could a 34­m antenna be used at Tidbinbilla? (instead of 70­m) NO
15. Number of sources: 2 [If more than 6 sources, please attach list. If more than 30 give
only selection criteria and LST range(s)]
16. Name
[order of priority]
Coordinates (J2000)
** Give most accurate position known **
RA DEC
(hh:mm:ss.sss) (\Sigmadd:mm:ss.ss)
Frequency
(MHz)
Band
width
(MHz)
Intensity (cont)
total peak
(Jy) (mJy)
Time
requested
(hr)
NGC4945 13 02 32 ­49 12 02 22200 2 \Theta 16 3 4 2 \Theta 18
Circinus 14 09 18 ­65 06 19 22200 2 \Theta 16 4 11 2 \Theta 16
17. Tapes per station (cassettes or Mk III): 24 cassettes/12h­track
18. Recorded tapes to be sent to: J. E. Reynolds, Epping
19. Where will tapes be correlated?: ATNF
20. Where will data be processed?: ATNF/CfA/NRAO
21. Special hardware, software or operating requirements:
Cryogenic 1cm receiver at Ho, 2 \Theta 30 MHz independently tunable IFs at Tid70, S2 at Mauna Kea for
NGC4945 : a companion standing proposal to NRAO is active.
22. Preferred range of dates for scheduling: Winter observing conditions at LBA.
23. Unsuitable dates:
24. Please attach a description and scientific justification of proposal, in not more than 1500 words
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