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Daily Report #4391



 
 
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Old June 26th 07, 03:49 PM posted to sci.astro.hubble
Pataro, Pete
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Posts: 33
Default Daily Report #4391

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 # 4391

PERIOD COVERED: UT June 25, 2007 (DOY 176)

OBSERVATIONS SCHEDULED

WFPC2 10880

The host galaxies of QSO2s: AGN feeding and evolution at high luminosities

Now that the presence of supermassive black holes in the nuclei of galaxies
is a well established fact, other questions related to the AGN phenomena
still have to be answered. Problems of particular interest are how the AGN
gets fed, how the black hole evolves and how the evolution of the black hole
is related to the evolution of the galaxy bulge. Here we propose to address
some of these issues using ACS/WFC + F775W snapshot images of 73 QSO2s with
redshifts in the range 0.3z0.4. These observations will be combined with
similar archival data of QSO1s and ground based data of Seyfert and normal
galaxies. First, we will intestigate whether interactions are the most
important feeding mechanism in high luminosity AGNs. This will be done in a
quantitative way, comparing the asymmetry indices of QSO2 hosts with those
of lower luminosity AGNs and normal galaxies. Second, we will do a detailed
study of the morphology of the host galaxies of both QSO types, to determine
if they are similar, or if there is an evolutionary trend from QSO2s to
QSO1s. The results from this project will represent an important step in the
understanding of AGN evolution, and may also introduce a substantial
modification to the Unified Model.

WFPC2 11024

WFPC2 CYCLE 15 INTERNAL MONITOR

This calibration proposal is the Cycle 15 routine internal monitor for
WFPC2, to be run weekly to monitor the health of the cameras. A variety of
internal exposures are obtained in order to provide a monitor of the
integrity of the CCD camera electronics in both bays {both gain 7 and gain
15 -- to test stability of gains and bias levels}, a test for quantum
efficiency in the CCDs, and a monitor for possible buildup of contaminants
on the CCD windows. These also provide raw data for generating annual
super-bias reference files for the calibration pipeline.

NIC1/NIC2/NIC3 8794

NICMOS Post-SAA calibration - CR Persistence Part 5

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.

NIC2 11133

Late-Time Photometry of SN 2005hk: A New Kind of Type Ia Supernova

Our lack of understanding of Type Ia supernova {SN Ia} explosions limits our
confidence in their use for cosmology. While there is broad agreement that
these objects represent the explosions of white dwarfs, the details of the
explosion mechanism are not well- understood. Recent observations have
detected a previously unacknowledged variant class of SNe Ia whose
photometric and spectroscopic peculiarities make them quite distinct from
normal SNe Ia. These objects represent a challenge for thermonuclear
supernova models, as a complete theory of exploding white dwarfs must allow
for their existence. A particularly well-studied example of this class of
objects is the recent SN 2005hk, whose properties in some respects resemble
those of models which invoke a subsonic burning front, called a
deflagration. We propose to test SN Ia models by obtaining late-time
photometry for this extreme SN Ia using WFPC2 and NICMOS on HST. We will
accurately measure the late-time photometric decline rate and spectral
energy distribution {SED}. These observations will allow us to test whether
the ejecta contain the large amount of oxygen predicted by certain models,
the efficiency of energy deposition by gamma rays and positrons, and
possibly detect major evolution of the SED expected due to a change in the
dominant cooling mechanism of the ejecta.

WFPC2 11023

WFPC2 CYCLE 15 Standard Darks - part 1

This dark calibration program obtains dark frames every week in order to
provide data for the ongoing calibration of the CCD dark current rate, and
to monitor and characterize the evolution of hot pixels. Over an extended
period these data will also provide a monitor of radiation damage to the
CCDs.

WFPC2 11112

The Collisional Ring Galaxy NGC922

We request WFPC2 images of the newly recognized collisional ring galaxy
NGC922 which will become the nearest such system observed by HST. These will
be used to get a clear understanding of the geometry of the interaction and
the induced star formation in this system. Quantitive modeling of the colors
of the star clusters and stellar populations will be used to constrain the
star formation history of the system. They will also be used to test the
"infant mortality" scenario for star cluster evolution. The derived
population ages will test predictions of how star formation evolves in the
various components {ring, core, spokes} of collisional rings, and will
improve our own simulations of this system. These will be used to determine
the final fate of the stars formed in the present burst - some will end up
in a central bar or bulge while others will become part of a thickened disk.
By analogy this will tell us how similar collisions enrich stellar
populations in the early universe. This is especially relevant since the
number density of collisional rings increases rapidly with redshift.

WFPC2 11140

Can mass-ejections from late He-shell flash stars constrain
convective/reactive flow modeling of stellar interiors?

The existence of H-deficient knots around the central stars of the planetary
nebulae Abell 30 and Abell 78 is still unexplained. We hypothesize that
these knots were ejected during a very late helium-shell flash {= very late
thermal pulse, VLTP} suffered by the precursor white dwarf stars. If this is
true, then the characteristics of these knots {mass, velocity, density,
spatial distribution} allow to draw conclusions on the course of the
hydrogen- ingestion flash detonation that is triggered by the He-shell
flash. This provides important, otherwise inaccessible constraints for the
hydrodynamical modeling of convective/reactive flows in stellar interiors.
Understanding the physics of these flows is not only important for the
understanding of these particular central stars, but also for the frequent,
very similar convective/reactive events that determine the nucleosynthesis
in Pop. III stars. With this proposal we want to proof or discard the idea
that the H-deficient knots are resulting from a VLTP. If true, then they can
be exploited for flash-physics diagnostics. We propose a simple test. We
search for such knots around five H-deficient central stars {PG1159 stars}.
Our models predict, that only those stars with residual nitrogen in the
atmosphere have suffered a VLTP and, hence, should have expelled knots. We
therefore want to take [O III] images of stars which have photospheric N and
those which do not.

FLIGHT OPERATIONS SUMMARY:

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

HSTARS:

10870 - GSAcq(1,2,1) failed to RGA Hold (Gyro Control)

Upon acquisition of signal at 177/06:04:01, the GSAcq(1,2,1) scheduled at
177/05:34:41 - 05:42:46 had failed to RGA Hold due to (QF1STOPF) stop flag
indication on FGS-1. Pre-acquisition OBADs (RSS) attitude correction values
not available pending future Engineering Tape Recorder (ETR) Dump. Post-acq
OBAd/MAP had (RSS) value of 1258.80 arcseconds.

COMPLETED OPS REQUEST: (None)

SCHEDULED SUCCESSFUL

FGS GSacq 5 4
FGS REacq 7 7
OBAD with Maneuver 22 22

COMPLETED OPS NOTES: (None)

SIGNIFICANT EVENTS: (None)
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