Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/alfa/ealfa/meeting2/handouts/jess_alfa.may04.ps Дата изменения: Sat May 13 00:11:08 2006 Дата индексирования: Sun Dec 23 04:14:04 2007 Кодировка: Поисковые слова: http www.astronomy.ru forum index.php topic 4644.0.html

E­ALFAMedium­Deep
Survey
Jessica
L.
Rosenberg

Can
we
design
a
medium­deep
survey
that
will
allow
us
to
explore
new
parameter
space
for
galaxy
detection
while
covering
enough
area
to
obtain
statistically
significant
samples? Is
this
an
important
legacy
for
the
extragalactic
surveys?
What
science
are
we
going
to
do
that
will
excite
the
next
generation
of
radio
astronomers?

Goals
for
a
medium­deep
survey:
.
HI
mass
function
over
a
range
of
environments
.
HI
mass
function
less
affected
by
distance
errors
and
the
local
overdensity
.
Serendipitous
science
­
exploring
new
parameter
space
.
Deep
surveying
of
Virgo
and/or
other
nearby
groups

60
s
300
s
600
s
ALFALFA
VAVA
Obs. Time
1200
1200
1200
1990
1910
Area Covered
2000
115.8
57.9
6600
1600
Distance @10
7
19.7
29.4
35.0
13.0
19.7
Distance @10
8
53.5
79.9
95.1
35.3
53.5
Distance @10
9
139.7
208.5
248.2
92.2
139.7
Indep
10
3
Vol@10
7
15
34
49
3
5
Indep
10
3
Vol@10
8
192
474
362
7
11
Num
Gal
@10
6
­10
7
621
132
110
674
487
Num
Gal
@10
7
­10
8
4789
946
780
4927
3828

Regions
of
interest
for
surveying
(a
few
ideas
to
start
discussion):
.
Virgo
region
complementary
to
broader
shallow
regions .
SMUDGES
7
strip
where
optical
dwarf
galaxy
data
are
available
.
Regions
around
nearby
galaxies
.
Regions
around
other
nearby
groups

Survey
Strategy
.
Observing
a
patch
of
sky
.
Connected
regions
for
context
.
Limited
number
of
environments
surveyed
.
Observing
a
strip
or
strips
across
the
sky
.Without
larger
shallower
survey
it
will
lack
context .
Surveys
a
much
greater
range
of
environments

Observing
Strategy
.
Driftscan
observations
.Well
tested
strategy
.May
not
fit
in
with
commensal
observing
.
Step
and
Stare
observations
.Will
work
best
in
piggy­backing
with
pulsar
observations .Will
need
work
to
design
the
most
optimal
strategy
for
sky
coverage
and
most
uniform
sensitivity
coverage

Where
does
it
fit
in?
.
This
will
also
be
a
significant
amount
of
time
to
be
done
right
.
Should
this
be
a
commensal
project
or
is
it
important
enough
for
E­ALFA
to
dedicate
our
own
time
to
it?
.
How
does
it
fit
in
with
ALFALFA
and
VAVA
in
terms
of
reaching
our
science
goals?
.
How
do
we
balance
the
various
projects?