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Daily Report # 4320



 
 
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Old March 16th 07, 04:17 PM posted to sci.astro.hubble
Cooper, Joe
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Posts: 568
Default Daily Report # 4320

Notice: For the foreseeable future, the daily reports may contain
apparent discrepancies between some proposal descriptions and the
listed instrument usage. This is due to the conversion of previously
approved ACS WFC or HRC observations into WFPC2, or NICMOS
observations subsequent to the loss of ACS CCD science capability in
late January.


HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT # 4320

PERIOD COVERED: UT March 15, 2007 (DOY 074)

OBSERVATIONS SCHEDULED

ACS/SBC 11050

ACS UV contamination monitor

The observations consist of imaging and spectroscopy with SBC of the
cluster NGC 6681 in order to monitor the temporal evolution of the UV
sensitivity of the SBC.

FGS 10927

The Weight-Watcher Program for Subdwarfs

We propose to use HST/FGS1r to measure five subdwarf spectroscopic
binaries to determine masses for the components. Their metallicities,
[Fe/H], range from -0.5 to -2.5, and their projected minimum
separations range from 9 to 24 mas. These binaries are resolvable with
HST/FGS1r but not any ground-based technique. Currently, there are
only two subdwarf systems having any mass measurements. The proposed
work will boost the total number of subdwarf systems with masses from
two to seven, and allow us to construct the first mass-luminosity
relation for low-metallicity stars.

NIC1/NIC2/NIC3 8795

NICMOS Post-SAA calibration - CR Persistence Part 6

A new proceedure proposed to alleviate the CR-persistence problem of
NICMOS. Dark frames will be obtained immediately upon exiting the SAA
contour 23, and everytime 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 i mages. Each observation will need its
own CRMAP, as different SAA passages leave different imprints on the
NICMOS detectors.

NIC2 10802

SHOES-Supernovae, HO, for the Equation of State of Dark energy

The present uncertainty in the value of the Hubble constant {resulting
in an uncertainty in Omega_M} and the paucity of Type Ia supernovae at
redshifts exceeding 1 are now the leading obstacles to determining the
nature of dark energy. We propose a single, integrated set of
observations for Cycle 15 that will provide a 40% improvement in
constraints on dark energy. This program will observe known Cepheids
in six reliable hosts of Type Ia supernovae with NICMOS, reducing the
uncertainty in H_0 by a factor of two because of the smaller
dispersion along the instability strip, the diminished extinction, and
the weaker metallicity dependence in the infrared. In parallel with
ACS, at the same time the NICMOS observations are underway, we will
discover and follow a sample of Type Ia supernovae at z 1. Together,
these measurements, along with prior constraints from WMAP, will
provide a great improvement in HST's ability to distinguish between a
static, cosmological constant and dynamical dark energy. The Hubble
Space Telescope is the only instrument in the world that can make
these IR measurements of Cepheids beyond the Local Group, and it is
the only telescope in the world that can be used to find and follow
supernovae at z 1. Our program exploits both of these unique
capabilities of HST to learn more about one of the greatest mysteries
in science.

NIC3 11080

Exploring the Scaling Laws of Star Formation

As a variety of surveys of the local and distant Universe are
approaching a full census of galaxy populations, our attention needs
to turn towards understanding and quantifying the physical mechanisms
that trigger and regulate the large-scale star formation rates {SFRs}
in galaxies.

NIC3 11098

Pinning down the redshift of the J-band dropout JD0910+46

The earliest galaxies in the Universe should have formed at very high
redshifts, based both on models of hierarchical structure formation,
and on observations of the microwave background polarization by WMAP
that require significant ionization of the intergalactic medium before
z=10. However, direct observation of sources at z7 remains highly
challenging due to their scarcity and faintness. We recently
identified a spatially extended J-band dropout, JD0910+46, that is a
promising candidate for a z10 galaxy. Its spectral energy
distribution is more extreme than any previously reported: It is
undetected in our 2- orbit J-band observation, with a very red J-H
color, yet is bluer in H-K than plausible lower redshift {z~3} model
SEDs. These colors are, however, natural for a very high redshift
star-burst galaxy in which the Lyman-alpha break has moved mostly or
entirely through the F110W band. Here we propose deeper F110W and
F187W observations to better map the spectral energy distribution of
JD910+46, these have the potential to convincingly reject all low
redshift solutions for the origin of the observed colours. We believe
the importance of such a discovery adds urgency to the followup, and
motivates this DD request. Even in the event that JD0910+46 lies at
lower redshift understanding the nature of the object will be of great
importance since it may lie in a significant overdensity of galaxies
at z~4, and will be an important tool for identifying possible
interlopers in samples of ultra high-z galaxies.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.)

HSTARS: (None)

COMPLETED OPS REQUEST: (None)

COMPLETED OPS NOTES: (None)

SCHEDULED SUCCESSFUL

FGS GSacq 06 06
FGS REacq 08 08
OBAD with Maneuver 28 28

SIGNIFICANT EVENTS: (None)



 




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