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Daily Report #5169

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Old August 27th 10, 03:35 PM posted to sci.astro.hubble
Cooper, Joe
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Posts: 568
Default Daily Report #5169

HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science


PERIOD COVERED: 5am August 26 - 5am August 27, 2010 (DOY 238/09:00z-239/09:00z)


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

HSTARS: (None)



FGS GSAcq 03 03
FGS REAcq 12 12
OBAD with Maneuver 03 03



STIS/CCD 11845

CCD Dark Monitor Part 2

Monitor the darks for the STIS CCD.

STIS/CCD 11847

CCD Bias Monitor-Part 2

Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1,
and 1x1 at gain = 4, to build up high-S/N superbiases and track the
evolution of hot columns.

WFC3/IR 11708

Determining the Sub-stellar IMF in the Most Massive Young Milky Way
Cluster, Westerlund 1

Despite over 50 years of active research, a key question in galactic
astronomy remains unanswered: is the initial mass function (IMF) of
stars and sub-stellar objects universal, or does it depend on initial
conditions? The answer has profound consequences for the evolution of
galaxies as well as a predictive theory of star formation. Work to
date suggests that certain environments (high densities, e.g.
Elmegreen 2004; low metallicity, e.g. Larson 2005) should produce a
top-heavy IMF, and there are hints from unresolved star-bursts that
this might be the case. Yet, there is no clear evidence for an IMF
that differs from that characterizing the Galactic field stars in a
resolved stellar population down to one solar mass. Westerlund 1 is
the most massive young star cluster known in the Milky Way. With an
estimated mass of 5x10^4 Msun, an age of 3-5 Myr, and located at a
distance of 3-4 kpc, it presents a unique opportunity to test whether
the IMF in such a cluster deviates from the norm well down into the
brown dwarf regime. We propose WFC3 near-IR imaging to probe the IMF
down to 40 Jupiter masses. The data will enable use to: 1) provide a
stringent test of the universality of the IMF under conditions
approximating those of star-bursts; 2) search for primordial or
dynamic mass segregation in the clusters; and 3) assess whether the
cluster is likely to remain bound (as a massive open cluster) or
disperse into the field. We will obtain images in the F125W, F160W,
and F139M filters. The F139M filter covers a strong water absorption
feature and the color F125W/F139M is a powerful temperature diagnostic
in the range 2800-4000 K. This information will enable us to: a)
confirm membership for low mass stars suspected on the basis of their
position in the color-magnitude diagram; b) place the members in the
HR diagram; and c) estimate the masses and ages of cluster members for
low-mass stars and sub-stellar objects. This new capability offered
with the WFC3 (through a novel combination of filter complement, high
spatial resolution, and large field of view) will enable us to make a
fundamental test of whether the IMF is universal on a unique resolved
stellar population, as well as assess the clusters structure,
dynamics, and ultimate fate.

WFC3/UV 11638

Illuminating the HI Structure of a Proto-cluster Region at z=2.84

We propose very deep intermediate-band Lyman alpha imaging in the
field of a newly-discovered proto-cluster region surrounding the
extremely luminous QSO HS1549+19 at z=2.844. The large structure,
initially discovered in a spectroscopic survey of galaxies in fields
surrounding the brightest QSOs at z=2.5-2.8, represents an ideal
laboratory for studying the response of the intergalactic medium to a
source of ionizing photons that exceeds the UV background by factors
1000. Within a single pointing of WFC3-UVIS there are already more

than 45 known Lyman alpha emitters, most of which are already
spectroscopically confirmed, and at least 3 of which are giant ?Lyman
alpha blobs''. Many of the objects have properties similar to those
expected from the process of fluorescence, in which Lyman alpha
emission is induced by the UV radiation field of the QSO in any HI gas
that dense enough to remain partially self-shielded. Fortuitously, the
F467M filter (Stromgren "b") in WFC3-UVIS is a perfect match to Lyman
alpha at z=2.844. In combination with an equally deep broad-band
continuum image, the observations will allow the construction of a
Lyman alpha map tracing dense gas throughout the inner parts of a
proto-cluster region at sub-kpc resolution. The ability to measure the
spatial sub-structure and surface brightness distribution of Lya
emission, relative to known protocluster galaxies and AGN, will
illuminate the "cosmic web'' in a dense region caught in a violent
stage of formation.

WFC3/UVIS 11905

WFC3 UVIS CCD Daily Monitor

The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames. A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations. The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS).

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