Information on targets and AO TTS:
OB names R(TTS) target separation comments
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Q2343-BX610_LGSAO_P81-# 18.0 K=19.2 58 arcsec H_alpha: line at 2.107um
integrated flux ~3.3e-16 erg/s/cm2
major axis FWHM ~ 1.3"
D3a6004_LGSAO-Sky_P81-# 15.8 K=18.9 50 arcsec H_alpha: line at 2.224um
integrated flux ~1.8e-16 erg/s/cm2
major axis FWHM ~ 1.5"
The main characteristics of the observations are as follows.
- The PA is set to 20 deg for Q2343-BX610 primarily for scientific reasons and to
allow for on-source dithering, as well as to ensure the tip-tilt reference falls
within the Field Selector field of view (FOV). THIS PA SHOULD NOT BE MODIFIED.
- The targets have the following priority:
beginning of P81: 1) D3a6004 : 10 OBs
end of P81 : 2) Q2346-BX610 : 6 OBs
- Since there is no overlap in the times when each of the target is visible,
D3a6004 has the highest priority simply because it is observable at the begining
of
P81 (RA ~ 11h25m) while Q2343-BX610 is observable towards the end of P81 (RA ~
23h45).
- OBs are named after the targets, with "-0", "-1", "-2", etc. appended for different
OBs.
- There is no priority among the OBs for D3a6004; therefore, the priority is set
to 1 in
all these OBs.
- For Q2343-BX610, there is no priority among Q2343-BX610_LGSAO_P81-0, -1, -2, -3,
-4;
the priority in those OBs has been set to 2. The sixth OB Q2343-BX610_LGSAO_P81-5
is shorter and has lowest priority, set to 3.
- The DITs for our exposures of our faint targets are 600s.
- The brightest spectral feature of the targets is H_alpha in emission;
the observed wavelength, integrated flux, and size of H_alpha are thus
given in the table above.
- We are using the 100mas scale, with FOV of 3.2"x3.2".
Two different strategies are followed, depending on the target.
(1) The first target, D3a6004, is extended in all directions based on our previous
seeing-limited mode SINFONI data. For proper coverage of the entire source
and
proper background subtraction, "sky" exposures away from the source are needed.
The sequence is "O S O O S O" where each "O" on-source pointing is offset by
about 0.2" along RA and DEC in four positions around the target (giving a "jitter
box width" of about 0.4").
(2) For the second target, Q2343-BX610, the source is also extended but mostly in
one
direction (PA ~ 20 deg). This morphology is best seen in HST/NICMOS imaging
at a
resolution of ~0.2" (included in the finding charts). This enables "on-source
dithering", where two successive exposures are offset along E-W by about 1/2
the
3.2"x3.2" FOV (i.e., about 1.5") for pairwise sky subtraction. Small jitters
about
the two main dithering positions are used to minimize the number of redundant
positions.
We would like to emphasize that we have observed both targets previously with SINFONI,
and we are therefore fully confident that the strategy in the present OBs will be
successful and will map optimally the targets emission.
We would also like to note that for BX610, the only suitable tip-tilt source (TTS)
available is a compact but rather faint galaxy. We are aware of the possible limitations
this could have on the AO performance. Our experience from the SINFONI GTO visitor
runs
using AO in LGS mode with TTS of similar magnitude and at comparable distances from
the
science targets was successful and provided effective angular resolution of 0.15"-0.3",
which still meets our scientific requirements.
We are thus confident that these observations can be carried out, and if the acquisition
presents some difficulties, we would like to kindly ask the observers to do their
best,
or to contact the P.I. if needed.
Remarks on the finding charts:
- Two finding charts are provided for each target and OB, following the instructions
for SINFONI.
(1) The first one (SINFONI_{source}_fchart1.jpg) have wider FOV; a large and
a small black square show regions 1' x 1' and 8" x 8" centered on the target;
the TTS is labeled "R1". The larger dashed rectangle shows the Strap Field
Selector FOV of the AO system.
(2) The second one (SINFONI_{source}_fchart2.jpg) is zoomed in on the target,
with the large and small solid-line squares showing regions of 8" x 8" and
3.2" x 3.2" centered on the target. In addition, two dashed-line squares
show
the outline of the jitter box for D3a6004, and the two main dithering positions
for Q2343-BX610.
- For Q2343-BX610, a third finding chart is included, SINFONI_Q2343-BX610_fchart3.jpg.
It is similar to the zoomed SINFONI_Q2343-BX610_fchart2.jpg but based on much
higher
resolution HST/NICMOS imaging. This clearly shows why the PA = 20 deg is crucial
for this target.