Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ops/newpc_nicmos.txt Дата изменения: Thu Jan 8 17:48:06 1998 Дата индексирования: Sat Mar 1 07:31:18 2014 Кодировка: Поисковые слова: fiction

Here is a semi fictionalized narrative that should allow you to
construct a proposal from scratch using the Phase II Proposal
Instructions. There is no useless information here, so all facts
should end up in the final proposal specification.

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Your name is Chris Fassnacht. You are a Co-I on a proposal called
"NICMOS observations of the gravitational lens 1608+656" that has been
given time on HST for Cycle 7. (Your proposal was given a favorable
review by the TAC, and awarded 4 orbits of CVZ time.) The PI (Anthony
Readhead) has asked you to handle writing and coordinating the Phase 2
proposal for the team (which consists of you, the PI and Roger
Blandford - all at the California Institute of Technology).

This was the abstract of your Phase 1 proposal: "We request NICMOS
observations of the gravitational lens system 1608+656 in order to
measure the light distribution of the lens while minimizing the
effects of extinction."

This was your description of the observation: "The observation is
aimed at imaging a relatively faint galaxy (V ~ 22.6) in the presence
of fairly bright lensed images."

First you get coordinates for your target GAL-1609+6532 (which is a
Radio Galaxy that exhibits lensing). Then you extract a FITS
image of that region of the sky from the HST Digitized Sky survey so
that you can measure the coordinates in the same reference system as
the guide stars. You get:

RA of 16 hours, 9 minutes, 13.96 seconds +/- 0.1 arcseconds
DEC of 65 degrees, 32 arcminutes, 28 arcseconds +/- 0.1 arcseconds
In the header of the FITS file it says that this extraction came
from the survey plate named 034O (ends in the letter O).

The target's flux at 1.6 microns is 2.4 x 10**-17 erg/(cm**2 sec A)

You want to observe this galaxy with the NICMOS camera that provides
the greatest resolution using a filter that will pass wavelengths
between 1.4 and 1.8 microns. The galaxy is small, so you would like the
image to fall on the optimum center of the chip.

Since the NICMOS chips can be read out in a non destructive manner,
you would like to use the observing mode that allows multiple reads of
the the array. You choose the read pattern that starts with a
logarithmic spacing that ramps up to the largest linear spacing
available. You also choose the maximum number of samples for the
sequence.

In order to minimize the effects of bad areas on the chip you want to
repeat the observation exactly 7 times in a pattern that looks like:


3 6



4 1 2



7 5

where 1 and 2 are separated by 1 arcsecond.

After the observations are taken you plan to retrieve the data as soon
as possible from the archive and will not need tapes generated and
sent.