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Daily Report #4688



 
 
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Old September 4th 08, 01:32 PM posted to sci.astro.hubble
Cooper, Joe
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Default Daily Report #4688

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT****** #4688

PERIOD COVERED: 5am September 3 - 5am September 4, 2008 (DOY
247/0900z-248/0900z)

OBSERVATIONS SCHEDULED

NIC1/NIC2/NIC3 11820

NICMOS Post-SAA Calibration - CR Persistence Part 7

Internals for CR persistence

NIC2 11219

Active Galactic Nuclei in Nearby Galaxies: a New View of the Origin of
the Radio-loud Radio- quiet Dichotomy?

Using archival HST and Chandra observations of 34 nearby early-type
galaxies {drawn from a complete radio selected sample} we have found
evidence that the radio-loud/radio-quiet dichotomy is directly
connected to the structure of the inner regions of their host galaxies
in the following sense: [1] Radio-loud AGN are associated with
galaxies with shallow cores in their light profiles [2] Radio-quiet
AGN are only hosted by galaxies with steep cusps. Since the brightness
profile is determined by the galaxy's evolution, through its merger
history, our results suggest that the same process sets the AGN
flavour. This provides us with a novel tool to explore the
co-evolution of galaxies and supermassive black holes, and it opens a
new path to understand the origin of the radio-loud/radio-quiet AGN
dichotomy. Currently our analysis is statistically incomplete as the
brightness profile is not available for 82 of the 116 targets. Most
galaxies were not observed with HST, while in some cases the study is
obstructed by the presence of dust features. We here propose to
perform an infrared NICMOS snapshot survey of these 82 galaxies. This
will enable us to i} test the reality of the dichotomic behaviour in a
substantially larger sample; ii} extend the comparison between
radio-loud and radio-quiet AGN to a larger range of luminosities.

NIC2 11548

NICMOS Imaging of Protostars in the Orion A Cloud: The Role of
Environment in Star Formation

We propose NICMOS observations of a sample of 252 protostars
identified in the Orion A cloud with the Spitzer Space Telescope.
These observations will image the scattered light escaping the
protostellar envelopes, providing information on the shapes of outflow
cavities, the inclinations of the protostars, and the overall
morphologies of the envelopes. In addition, we ask for Spitzer time to
obtain 55-95 micron spectra of 75 of the protostars. Combining these
new data with existing 3.6 to 70 micron photometry and forthcoming
5-40 micron spectra measured with the Spitzer Space Telescope, we will
determine the physical properties of the protostars such as envelope
density, luminosity, infall rate, and outflow cavity opening angle. By
examining how these properties vary with stellar density (i.e.
clusters vs groups vs isolation) and the properties of the surrounding
molecular cloud; we can directly measure how the surrounding
environment influences protostellar evolution, and consequently, the
formation of stars and planetary systems. Ultimately, this data will
guide the development of a theory of protostellar evolution.

WFPC2 11156

Monitoring Active Atmospheres on Uranus and Neptune

We propose Snapshot observations of Uranus and Neptune to monitor
changes in their atmospheres on time scales of weeks and months.
Uranus equinox is only months away, in December 2007. Hubble Space
Telescope observations during the past several years {Hammel et al.
2005, Icarus 175, 284 and references therein} have revealed strongly
wavelength- dependent latitudinal structure, the presence of numerous
visible-wavelength cloud features in the northern hemisphere, at least
one very long-lived discrete cloud in the southern hemisphere, and in
2006 the first dark spot ever seen on Uranus. Long-term ground-based
observations {Lockwood and Jerzekiewicz, 2006, Icarus 180, 442; Hammel
and Lockwood 2007, Icarus 186, 291} reveal seasonal brightness changes
whose origins are not well understood. Recent near- IR images of
Neptune obtained using adaptive optics on the Keck Telescope, together
with HST observations {Sromovsky et al. 2003, Icarus 163, 256 and
references therein} which include previous Snapshot programs {GO 8634,
10170, 10534} show a general increase in activity at south temperate
latitudes until 2004, when Neptune returned to a rather Voyager-like
appearance. Further Snapshot observations of these two dynamic planets
will elucidate the nature of long-term changes in their zonal
atmospheric bands and clarify the processes of formation, evolution,
and dissipation of discrete albedo features.

WFPC2 11327

Red leaks

The aim of this program is to measure the red leaks in the 8 WFPC2
UV??? filters (F122M, F300W, F255W, F218W, F185W, F170W, F160BW,
F122M). We will use red crossing filters to isolate and directly
measure the leaks. No observations of this kind have ever been
performed with WFPC2 to check the red leaks in the UV filters, most of
them being extensively used by GO/GTO programs. A previous calibration
program has only imaged spectrophotometric standard stars with UV
filters (no filter crossing) thus the red leak is hard to measure
using this data. The throughput curves for some of the UV filters
(F300W, F255W, F218W, F185W) in synphot have incomplete information,
some of them have gaps in the measurements as wide as 3000A.

WFPC2 11795

WFPC2 Cycle 16 UV Earth Flats

Monitor flat field stability. This proposal obtains sequences of earth
streak flats to improve the quality of pipeline flat fields for the
WFPC2 UV filter set. These Earth flats will complement the UV earth
flat data obtained during cycles 8-15.

FLIGHT OPERATIONS SUMMARY:

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

HSTARS:

11465 - GSAcq(2,0,2) & ReAcq(2,0,2) failed to RGA Hold (Gyro Control)

GSAcq(2,0,2) scheduled at 247/11:11:12z & ReAcq(2,0,2) scheduled at
247/12:47:49z failed due to Search Radius Limit Exceeded Error on
FGS-2.

Possible Observations affected: NICMOS 56-59, Proposal ID #11548.

11467 - GSAcq(1,2,2) failed

GSAcq (1,2,2) scheduled from 247/23:57:40 - 248/00:05:06 had failed
due to Search Radius Limit Exceeded on FGS 2. Mnemonics QF2SRLEX,
QF2STOPF, QSRCHEXC and QSTOP flagged out.

Observations affected: NICMOS Proposal 11548, observations 76, 77, 78

COMPLETED OPS REQUEST:

17543-2 - Dump OBAD Tables after Failed OBAD

COMPLETED OPS NOTES: (None)

*********************** SCHEDULED***** SUCCESSFUL

FGS GSacq*************** 12***************** 10
FGS REacq*************** 02***************** 01
OBAD with Maneuver* **** 28***************** 27

SIGNIFICANT EVENTS: (None)


 




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