Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.naic.edu/alfa/galfa/meetings/3/galfa3_taylor-software.ps.gz Äàòà èçìåíåíèÿ: Wed Sep 29 04:46:53 2004 Äàòà èíäåêñèðîâàíèÿ: Sun Dec 23 05:13:07 2007 Êîäèðîâêà: Ïîèñêîâûå ñëîâà: http astrokuban.info astrokuban

GALFA
Software
Group
.
GALFA­HI --
Narrow­band
spectral
line
data
cubes
of
HI
emission
.
GALFA­RRL --
Narrow­bad
spectral
line
data
cubes
of
recombination
lines
(multiple
frequencies
within
the
band)
.
GALFA­CON --
Wide­band,
spectro­polarimetry
(multi­channel)
data
cubes
In
process
of
forming...
GALFA
image
products

Software
Stages
.
Phase
I
­
Data
Acquisition
--
Sample
multi­beam
data
streams
from
the
spectrometer
--
Format
and
store
along
with
calibration
data
and
positions
tags
.
Phase
II
­
Image
formation
--
Apply
calibration
--
Correct
for
instrumental
effects
.
Spectral
baselines
.
Non­Gaussian
beam
.
Sidelobes
--
Rasterize/basket
weave
.
Phase
III
--
Scientific
processing/visualisation
--
Source
catalogues,
Rotation
measure
images,
HISA
detection,
Faraday
tomography
.
Data/image
Archiving

Status
resources
GALFA­CON:
Phase
I:
Desh
--
separate
the
Cal
ONs
and
OFFs
for
each
of
the
beams,
and
averaging
data
over
a
desired
integration
time
(e.g.
1
sec).
--
detect
RFI
and
exclude
the
affected
correlation
sets
from
the
average.
--
van­Vlack
correcting
the
correlations
of
signals
quantized
to
limited
bits.
--
compute
(auto/cross)
power
spectra
corresponding
to
the
average
auto/cross
correlations,
with
optional
smoothing/windowing
etc.
--
output
to
ASCII
file
the
average
spectral
Stokes
parameter
data
for
every
integration
interval
with
associated
sky
position
information.
.
Phase
II:
Christy
Bredeson,
Jo­Anne
Brown
--
Begin
work
this
fall
.
Phase
III:
--
Jo­Anne
Brown
(rotation
measure
images)
--
Desh
(Faraday
Tomography)

GALFACTS
Pilot
Study
GALFA
Continuum
Transit
Survey
Fast
scans
along
meridian
Full
polarimetry
with
L­wide
&WAPP
4x256
lag
correlations
``winking''
CAL
25
Hz
Bonn
Image
resolution
10#
I Q U

Status resources GALFA­HI(RRL): .
Phase I: --
Output to ``Big Dish'' FITS file using current software.
.
Phase II: John Goldsten --
Development underway using IDL
.
Phase II: --
Richard Gooch (visualisation
using karma)
--
?

Issues .
Role of consortium in phase I and II --
Model for software development? .
Individual efforts or coordinate development?
--
Common code base (IDL) .
Identify common features
.
Share algorithms and code
--
Quality control and oversight?
--
data products to consortium or software delivered to consortium?
--
Time line
.
Phase III responsibility of science teams?
.
Data achiving --
Who?
--
Where?

GALFACTS (GALFA Continuum Transit Survey) Covers all sky visible from Arecibo several year project (2005­2008)