Status Report

NASA Hubble Space Telescope Daily Report # 3402

By SpaceRef Editor
July 13, 2003
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NICMOS Post-SAA calibration – CR Persistence Part 2

A new procedure proposed to alleviate the CR-persistence problem of
NICMOS. Dark frames will be obtained immediately upon exiting the SAA
contour 23, and every time a NICMOS exposure is scheduled within 50
minutes of coming out of the SAA. The darks will be obtained in
parallel in all three NICMOS Cameras. The POST-SAA darks will be
non-standard reference files available to users with a USEAFTER
date/time mark. The keyword ‘USEAFTER=date/time’ will also be added to
the header of each POST-SAA DARK frame. The keyword must be populated
with the time, in addition to the date, because HST crosses the SAA ~8
times per day so each POST-SAA DARK will need to have the appropriate
time specified, for users to identify the ones they need. Both the raw
and processed images will be archived as POST-SAA DARKSs. Generally we
expect that all NICMOS science/calibration observations started within
50 minutes of leaving an SAA will need such maps to remove the CR
persistence from the science images. Each observation will need its
own CRMAP, as different SAA passages leave different imprints on the
NICMOS detectors.


The Size Scales of Line-Emitting Regions in the Cloverleaf QSO

The Cloverleaf QSO is a four-component gravitationally-lensed broad
absorption line {BAL} QSO. Models of the Cloverleaf lens indicate
that, if a sufficiently extended emitting region surrounds the central
source, an Einstein ring or partial ring will be seen in emission.
However, the compact continuum should appear as four unresolved
components, as is verified in existing broad-band images. These
predictions are very robust. We propose here to determine or place
limits on the size-scale of several of the emitting regions in the
Cloverleaf using this effect. This will be done using the ACS-WFC RAMP
filters to take images in LyAlpha, NV, and the nearby continuum.
Narrow-band observations with NICMOS will image OIII and the nearby
continuum. An observation of each of these emitting regions will allow
us to explore a different aspect of the QSO’s physical environment.
Regardless of the findings, these results will improve our
understanding of the size-scales of the line-emitting regions in BAL
QSOs and in QSOs in general.

WFPC2 9595


This dark calibration program obtains 3 dark frames every day to
provide data for monitoring and characterizing the evolution of hot

STIS 9612

STIS CCD Hot Pixel Annealing Cycle 11

The effectiveness of the CCD hot pixel annealing process is assessed
by measuring the dark current behavior before and after annealing and
by searching for any window contamination effects. In addition CTE
performance is examined by looking for traps in a low signal level
flat. Follows on from proposal 8906.

ACS 9674

CCD Daily Monitor

This program consists of basic tests to monitor, the read noise, the
development of hot pixels and test for any source of noise in ACS CCD
detectors. This programme will be executed once a day for the entire
lifetime of ACS.

ACS/WFC 9690

X-Raying Baade’s Window Through the Galactic Bulge

We propose to conduct the first of a two-part deep galactic plane
survey on one ACIS-I field in Baade’s Window, a region of low
obscuration near the galactic center. The survey will reach a
sensitivity limit of Lx ~ 3×10^30 erg/s for sources in the galactic
bulge, and thus provide the first census of accretion powered binaries
{cataclysmic variables and quiescent low mass x-ray binaries} as well
as millsecond pulsars to constrain the stellar and binary evolution of
the bulge vs the populations in globular clusters and the disk.
Optical identifications will be made with a coordinated mosaic survey
with ACS on HST {B/R/Halpha}, to achieve a sensitivity for CVs down to
their luminosity function peak at Mv ~9. A later, followup survey
would complete the coverage of Baades Window.

WFPC2 9709

POMS Test Proposal: WFII parallel archive proposal

This is the generic target version of the WFPC2 Archival Pure Parallel
program. The program will be used to take parallel images of random
areas of the sky, following the recommendations of the 2002 Parallels
Working Group.

WFPC2 9710

POMS Test Proposal: WFII backup parallel archive proposal

This is a POMS test proposal designed to simulate scientific plans.


Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.) None



                          SCHEDULED     SUCCESSFUL    FAILURE TIMES
FGS GSacq               9                         9
FGS REacq               7                          7
FHST Update             11                        11


Begin installation of CCS Release 5.0.3 on "D" and "F" Strings.

SpaceRef staff editor.