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Daily Report #4650



 
 
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Old July 11th 08, 05:04 PM posted to sci.astro.hubble
Pataro, Pete
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Default Daily Report #4650

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT #4650

PERIOD COVERED: 5am July 10 - 5am July 11, 2008
(DOY192/0900z-193/0900z)

OBSERVATIONS SCHEDULED

ACS/SBC 11151

Evaluating the Role of Photoevaporation of Protoplanetary Disk
Dispersal

Emission produced by accretion onto the central star leads to
photoevaporation, which may play a fundamental role in disk dispersal.
Models of disk photoevaporation by the central star are challenged by
two potential problems: the emission produced by accretion will be
substantially weaker for low-mass stars, and photoevaporation must
continue as accretion slows. Existing FUV spectra of CTTSs are biased
to solar-mass stars with high accretion rates, and are therefore
insufficient to address these problems. We propose use HST/ACS SBC
PR130L to obtain FUV spectra of WTTSs and of CTTSs at low masses and
mass accretion rates to provide crucial data to evaluate
photoevaporation models. We will estimate the FUV and EUV luminosities
of low-mass CTTSs with small mass accretion rates, CTTSs with
transition disks and slowed accretion, and of magnetically-active
WTTSs.

FGS 11212

Filling the Period Gap for Massive Binaries

The current census of binaries among the massive O-type stars is
seriously incomplete for systems in the period range from years to
millennia because the radial velocity variations are too small and the
angular separations too close for easy detection. Here we propose to
discover binaries in this observational gap through a Faint Guidance
Sensor SNAP survey of relatively bright targets listed in the Galactic
O Star Catalog. Our primary goal is to determine the binary frequency
among those in the cluster/association, field, and runaway groups. The
results will help us assess the role of binaries in massive star
formation and in the processes that lead to the ejection of massive
stars from their natal clusters. The program will also lead to the
identification of new, close binaries that will be targets of long
term spectroscopic and high angular resolution observations to
determine their masses and distances. The results will also be
important for the interpretation of the spectra of suspected and newly
identified binary and multiple systems.

FGS 11214

HST/FGS Astrometric Search for Young Planets Around Beta Pic and AU
Mic

Beta Pic and AU Mic are two nearby Vega-type debris disk stars. Both
of these disk systems have been spatially resolved in exquisite
detail, predominantly via the ACS coronagraph and WFPC-2 cameras
onboard HST. These images exhibit a wealth of morphological features
which provide compelling indirect evidence that these systems likely
harbor short-period planetary body{ies}. We propose to use the
superlative astrometric capabilities of HST/FGS to directly detect
these planets, hence provide the first direct planet detection in a
Vega-type system whose disk has been imaged at high spatial
resolution.

NIC1/NIC2/NIC3 11318

NICMOS Cycle 16 Multiaccum Darks

The purpose of this proposal is to monitor the dark current, read
noise, and shading profile for all three NICMOS detectors throughout
the duration of Cycle 16. This proposal is a slightly modified version
of proposal 10380 of cycle 13 and 9993 of cycle12 and is the same as
Cycle 15. Covers the period from April 08 to November 08 (inclusive)

NIC1/NIC2/NIC3 11330

NICMOS Cycle 16 Extended Dark

This takes a series of Darks in parallel to other instruments.

NIC1/NIC2/NIC3 8795

NICMOS Post-SAA Calibration - CR Persistence Part 6

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 i mages. Each observation will need its
own CRMAP, as different SAA passages leave different imprints on the
NICMOS detectors.

NIC2 11799

NICMOS Non-linearity Calibration for Faint Objects

NICMOS has played a key role in probing the deep near infrared regime
for a decade. It has been the only instrument available to observe
objects in the near infrared that are not visible from the ground. In
particular, it has played a major role in the SN Ia observations at
redshifts z1. However, the calibration of NICMOS has turned out to be
difficult due to the apparent non-linearity of the detectors. The
NICMOS calibration team has described the non-linearity as a power law
based on data in the range of ~50-5000 ADU/s. The correction relies on
an extrapolation of two orders of magnitude in flux at count rates
close to the sky level (0.1 ADU/s) where space observations are
particularly prized - and where SN Ia observations are made. Precise
measurements of faint objects require us to reduce the uncertainties
from this extrapolation. Here we propose to derive the absolute
calibration in the sky limited regime and to characterize the
non-linearity over the entire dynamic range for the camera/filter
combination: NIC2/F110W.

WEPC2 11196

An Ultraviolet Survey of Luminous Infrared Galaxies in the Local
Universe

At luminosities above 10^11.4 L_sun, the space density of far-infrared
selected galaxies exceeds that of optically selected galaxies. These
Luminous Infrared Galaxies {LIRGs} are primarily interacting or
merging disk galaxies undergoing starbursts and creating/fueling
central AGN. We propose far {ACS/SBC/F140LP} and near {WFPC2/PC/F218W}
UV imaging of a sample of 27 galaxies drawn from the complete IRAS
Revised Bright Galaxy Sample {RBGS} LIRGs sample and known, from our
Cycle 14 B and I-band ACS imaging observations, to have significant
numbers of bright {23 B 21 mag} star clusters in the central 30
arcsec. The HST UV data will be combined with previously obtained HST,
Spitzer, and GALEX images to {i} calculate the ages of the clusters as
function of merger stage, {ii} measure the amount of UV light in
massive star clusters relative to diffuse regions of star formation,
{iii} assess the feasibility of using the UV slope to predict the
far-IR luminosity {and thus the star formation rate} both among and
within IR-luminous galaxies, and {iv} provide a much needed catalog of
rest- frame UV morphologies for comparison with rest-frame UV images
of high-z LIRGs and Lyman Break Galaxies. These observations will
achieve the resolution required to perform both detailed photometry of
compact structures and spatial correlations between UV and redder
wavelengths for a physical interpretation our IRX-Beta results. The
HST UV data, combined with the HST ACS, Spitzer, Chandra, and GALEX
observations of this sample, will result in the most comprehensive
study of luminous starburst galaxies to date.

WFPC2 11167

A Unique High Resolution Window to Two Strongly Lensed Lyman Break
Galaxies

On rare occasions, the otherwise very faint Lyman Break Galaxies
{LBGs} are magnified by gravitational lensing to provide exceptional
targets for detailed spectroscopic and imaging studies. We propose HST
WFPC2 and NICMOS imaging of two strongly lensed Lyman Break Galaxies
{LBGs} that were recently discovered by members of our team. These two
LBGs -- the "8 O'Clock Arc" and the "SDSS J1206+5142 Arc" -- are
currently the brightest known LBGs, roughly 3 times brighter than the
former record-holder, MS1512-cB58 {a.k.a. "cB58"}. The z=2.73 "8
O'Clock Arc" extends ~10 arcsec in length and is magnified by a factor
of 12. The z=2.00 "SDSS J1206+5142 Arc" also extends ~10 arcsec in
length and is magnified by a factor of 30. Due to their brightness and
magnification, these two strongly lensed LBGs offer an unprecedented
opportunity for the very detailed investigation of two individual
galaxies at high redshift. We are currently pursuing a vigorous
ground-based campaign to obtain multi- wavelength {UV, optical, NIR,
radio} observations of these two LBGs, but our campaign currently
lacks a means of obtaining high-resolution optical/NIR imaging -- a
lack that currently only HST can address. Our prime objective for this
proposal is to obtain high resolution HST images of these two systems
with two-orbit WFPC2 images in the BVI bands and two-orbit NICMOS/NIC2
images in the J and H bands. These data will allow us to construct
detailed lensing models, probe the mass and light profiles of the
lenses and their environments, and constrain the star formation
histories and rest-frame UV/optical spectral energy distributions of
the LBGs.

FLIGHT OPERATIONS SUMMARY:

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

HSTARS:

#11384 REacq(1,2,2) failed to RGA control @ 193/02:33z.

REacq(1,2,2) scheduled at 193/02:30:57z failed to RGA control at
02:33:51z. Stop flags QF1STOPF and QSTOP were received for FGS 1.
There were no other flags or ESB messages. Observations affected: WFPC
101 -102 Proposal ID#11167, NIC 167 Proposal ID#11330.

#11385 GSacq(1,2,1) failed due to search radius limit exceeded
@193/06:56z.

During LOS, GSacq(1,2,1) scheduled at 193/06:56:46z failed due to
search radius limit exceeded on FGS 1. ESB message "a05" (FGS Coarse
Tract failed - search Radius Limit exceeded) was received.
Observations affected:* WFPC 103-105, Proposal ID #11142.

COMPLETED OPS REQUEST: (None)

COMPLETED OPS NOTES: (None)

******************************* SCHEDULED**** SUCCESSFUL
FGS GSacq*********************** 5******************* 4
FGS REacq*********************** 7******************* 6
OBAD with Maneuver******** ***** 24***************** 24

SIGNIFICANT EVENTS: (None)


 




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