Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_00/hst_status_08_21_00 Дата изменения: Mon Aug 21 14:57:54 2000 Дата индексирования: Sun Dec 23 10:16:09 2007 Кодировка: Поисковые слова: seyfert galaxy

HUBBLE SPACE TELESCOPE

DAILY REPORT #2690

PERIOD COVERED: 0000Z (UTC) 08/18/00 - 0000Z (UTC) 08/21/00

Daily Status Report as of 234/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Three Sets of STIS/CCD 8439 (Bias Monitor-Part 2 C8)

The Space Telescope Imaging Spectrograph (CCD) was used to 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. The proposal completed with no reported problems.

1.2 Completed Three Sets of WF/PC-2 8563 (Determining the Duplicity of
Nearby T Dwarfs {Methane Brown Dwarfs})

The WF/PC-2 was used to investigate the binary fraction of T-type
dwarfs {methane brown dwarfs} which is crucial to accurate determinations
of the T-dwarf space density and mass function, especially since equal-
magnitude binaries can introduce significant biases in photometric distance
estimates. The proposal completed nominally.

1.3 Completed Nine Sets of STIS/CCD 8808 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation III)

The Space Telescope Imaging Spectrograph (CCD) was used to make
non-scripted, parallel observations as part of a POMS test proposal. The
observations completed with no anomalous activity.

1.4 Completed Five Sets of STIS/CCD 8437 (Dark Monitor-Part 2 C8)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. The proposal completed nominally.

1.5 Completed Two Sets of STIS/CCD 8870 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation IV)

The Space Telescope Imaging Spectrograph (CCD) was used to make
non-scripted, parallel observations as part of a POMS test proposal. The
observations completed with no anomalous activity.

1.6 Completed STIS/CCD 8260 (Searching for the Hydrogen Reionization
Edge of the Universe at 5HST)

The Space Telescope Imaging Spectrograph (CCD) was used to observe
one of 36 parallel orbits {4--5 fields of 5--8 orbits each} to constrain
the H Lyman-edge in emission that marks the transition from a neutral to a
fully ionized IGM at a predicted zion~eq5--15. This edge is due to
recombination from the H Lyman series and Lyman continuum, and can be used
to constrain zion, one of the most important unknown quantities in large
scale structure and cosmology. The proposal completed nominally.

1.7 Completed WF/PC-2 8632 (A UV Atlas of Nearby Galaxies)

The WF/PC-2 was used to perform a snapshot survey of local galaxies
at UV wavelengths with the F300W filter. The aim of the project is to
build a reference UV Atlas of normal galaxies, whose optical images are
well known, with the highest possible degree of information, covering all
the morphological types and luminosity classes. The proposal completed
normally.

1.8 Completed WF/PC-2 8581 (A Search For Low-Mass Companions To
Ultracool Dwarfs)

The WF/PC-2 was used to search for very low-mass {VLM} companions
to a complete sample of 120 late-M and L dwarfs, drawn mainly from the
2MASS and SDSS surveys. The primary goal is to determine the multiplicity
of M < 0.1 M_odot dwarfs. In particular, we aim to identify binary systems
suitable for long-term astrometric monitoring and mass measurement, and
systems with cool, sub-1000K companions. The proposal completed with no
reported problems.

1.9 Completed Two Sets of STIS/CCD 8700 (A STIS Spectroscopic Snapshot
Survey of 3CR Radio Galaxies : The Nature of the Unresolved Nuclei)

The Space Telescope Imaging Spectrograph (CCD) was used to perform
STIS snapshot long-slit spectroscopy of these nuclei over 2900- 10300 AA to
classify them {QSO, NLRG, BLRG, BL Lac, ldots} and establish their AGN
characteristics down to the lowest nuclear luminosities, while still within
powerful 3C radio galaxies. The primary goals are : {1} to test
unification schemes by identifying previously undetected signatures of
low-level AGN/QSO activity in their spectra in the form of weak, broad
emission lines, featureless continua, and UV excess, {2} to constrain the
FR I/BL Lac connection by measuring the relative contribution of thermal
{starburst}, non-thermal {optical synchrotron}, and line emission, and {3}
to perform line and continuum diagnostics to determine the dominant
ionization mechanisms in the circumnuclear regions {tenths of arcseconds}
and the role of dust extinction in the NLRGs and BLRGs in the form of
geometrically thick or thin tori and foreground dust. The proposal
completed as planned, with no reported anomalies.

1.10 Completed Two Sets of STIS/CCD 8663 (Survey of SMC Planetary
Nebulae: Nebular and Stellar Evolution in a Low- Metallicity Environment)

The Space Telescope Imaging Spectrograph (CCD) was used to survey
of SMC planetary nebulae {PNe} in order to study the co-evolution of the
nebulae and their central stars, in an environment that is chemically very
metal poor. We will obtain STIS imaging and medium-resolution slitless
spectroscopy that will yield line fluxes and nebular morphologies in
important emission lines, plus magnitudes of the central stars. From these
data we will gather a harvest of information: the nebular size, morphology,
ionization structure, density, and mass; and the central star temperature,
luminosity, and mass. The proposal completed with no reported anomalies.

1.11 Completed Six Sets of WF/PC-2 8805 (POMS Test Proposal: WFII
Parallel Archive Proposal Continuation)

The WF/PC-2 was used to perform a generic target version of the
WFPC2 Archival Pure Parallel program. The program will be used to take
parallel images of random areas of the sky, following the recommendations
of the Parallels Working. The proposal completed with no reported problems.

1.12 Completed WF/PC-2 7407 (Continuation of Temporal Monitoring of the
Crab Synchrotron Nebula)

The WF/PC-2 was used to observe the synchrotron nebula surrounding
the Crab pulsar that has been the subject of intensive study for
decades. It is generally accepted that the structure and activity in this
region are due to wave phenomena near the termination shock of the pulsar
wind, observations of which hold unique promise of leading to more complete
models of the pulsar and its magnetosphere. Unfortunately, this promise
has not been fulfilled, largely because of the low spatial resolution and
uneven temporal coverage of existing studies. Recent WF/PC-2 observations
of the Crab synchrotron nebula offer new hope in this quest. These data,
which reach the natural size scale defined by the Larmor radius of
energetic electrons, resolve the majority of the the known features in the
Crab. For the first time it is possible to reliably establish the physical
conditions {e.g., emissivities, equipartition fields, and pressures} of
features associated with the wind and its termination shock. The
observation completed with as planned.

1.13 Completed STIS/CCD 8631 (Bright Quasar Close Lensing Search II)

The Space Telescope Imaging Spectrograph (CCD) was used to expand
the Cycle 8 second generation HST snapshot survey of bright quasars,
optimized to find lenses with component image separations < 1". The
observations completed nominally.

1.14 Completed Three Sets of STIS/MA1/MA2 8426 (Cycle 8 MAMA Dark
Measurements)

The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to
make a routine Cycle-8 MAMA dark noise calibration measurement. This
proposal will provide the primary means of checking on the health of the
MAMA detectors. This is done through frequent monitoring of the background
count rate. The observations were completed as planned, and no problems
were reported.

1.15 Completed STIS/CCD/MA2 8266 (Coherence Length of Lyman-Alpha
Absorbers at z ~ 1)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
measure the coherence length of Lyman-Alpha absorbers in the redshift range
0.5 < z < 1.1, using a new pair of quasars with a separation of 130
arcseconds. For quasars with this brightness {R = 18.1}, redshift and
separation are very rare. Coincident absorbers along the line-of-sight to
quasar pairs can reveal the geometry of the diffuse but highly ionized gas
that makes up the Lyman-Alpha forest; this gas represents the majority of
the baryons and it traces the underlying dark matter distribution. The
observations completed with no reported anomalies.

1.16 Completed Three Sets of WF/PC-2 8826 (Cycle 9 Supplemental Darks pt 1)

The WF/PC-2 was used to perform a T dark calibration program that
obtains three dark frames every day in order to provide data for monitoring
and characterizing the evolution of hot pixels. There were no reported
anomalies.

1.17 Completed STIS/CCD/MA2 8569 (A New Survey for Low-Redshift Damped
Lyman-Alpha Lines in QSO MgII Systems)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
support studies which have shown that most of the observable neutral gas
mass in the Universe resides in QSO damped LyAlpha {DLA} systems. However,
at low redshift , DLA can only be found by searching in the UV with
HST. By boot-strapping from the MgII statistics, we will be able to
further improve the determination of the low- redshift statistical
properties of DLA {their incidence and cosmological mass density} and open
up new opportunities for studies at low redshift. The observations
completed nominally.

1.18 Completed Two Sets of WF/PC-2 8645 (A Survey of Mid-UV Morphology
of Nearby Galaxies: Galaxy Structure and Faint Galaxy)

The WF/PC-2 was used to investigate the relation between star
formation and the global physical characteristics of galaxies to interpret
the morphologies of distant galaxies in terms of their evolutionary
status. The observations completed nominally.

1.19 Completed WF/PC-2 8598 (Snapshot Survey of Extended OIIl Lambda
5007Angstrom Emission in Seyfert Galaxies)

The WF/PC-2 was used for a snapshot survey of narrow band OIII
Lambda 5007Angstrom images for a well defined sample of 88 Seyfert galaxies
{29 Seyfert 1s and 59 Seyfert 2s}, 18 of which already have data in the
archive, selected from a mostly isotropic property, the 60Mum flux. These
data will be used: 1} to determine the origin of the misalignment between
the accretion disk axis and the host galaxy plane axis, which can be due to
mergers with other galaxies, or by the self induced radiation warping; 2}
to compare the size and shape of the Narrow Line Regions (NLR) of Seyfert
1s and Seyfert 2s, and to study the frequency of conically shaped NLR in
Seyfert galaxies, which are usually unresolved from ground-based
observations; and 3} estimate the importance of shocks to the ionization of
the NLR. The observations completed with no reported problems.

1.20 Completed Two Sets of STIS/CCD/MA1 8671 (Observations of a
Magellanic Cloud Nova in Outburst)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used for
target-of-opportunity observations of a classical nova in the Magellanic
Clouds in the early stages of its outburst. Nova outbursts are
thermonuclear runaways triggered by accretion onto a white dwarf within a
close binary system. The proposal completed with no reported problems.

1.21 Completed Two Sets of WF/PC-2 8059 (POMS Test Proposal: Targeted
Parallel Archive Proposal)

The WF/PC-2 was used to observe the parallel opportunities
available in the neighborhood of bright galaxies are treated in a slightly
different way from the normal pure parallels. Local Group galaxies offer
the opportunity for a closer look at young stellar
populations. Narrow-band images in F656N can be used both to identify
young stars via their emission lines, and to map the gas distribution in
star-forming regions. The observations completed nominally.

1.22 Completed STIS/CCD/MA1 8279 (Cataclysmic Variable Disk Winds: A
High Time and Spectral Resolution Study of Flow Inhomogeneity)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
observe disks and disk winds that are found in many astrophysical
settings. The proposal completed nominally.

1.23 Completed WF/PC-2 8683 (Imaging Of Brightest Cluster Galaxies: The
High End Of The Black Hole Mass Distribution)

The WF/PC-2 was used to make kinematic black hole detections in
galaxies to decide whether they indicate that the mass correlates with both
optical luminosity and radio power. The observation completed with no
reported problems.

1.24 Completed Two Sets of STIS/CCD 8640 (A Public STIS Survey of the
Host Galaxies of Gamma-Ray Bursts)

The Space Telescope Imaging Spectrograph (CCD) was used to obtain
high-resolution images of the fields containing gamma-ray burst with
well-localized coordinates; i.e. the burst has been localized to within
approximately one arcsecond. The goal of this survey is to obtain a
uniform sample of images of the host galaxies of these bursts. There were
no reported problems.

1.25 Completed Three Sets of WF/PC-2 8544 (POMS Test Proposal: WFII
Backup Parallel Archive Proposal II)

The WF/PC-2 was used to execute a POMS test proposal that was
designed to simulate scientific plans. No problems were encountered.

1.26 Completed FGS/1R 8728 (The Low-Mass Multiple System GL 831 {Wolf
922}: Definitive Orbit and the Mass-Luminosity Relation)

Fine Guidance Sensor (FGS) 1R was used to observe GL 831 = Wolf
that belongs to the select group of about one dozen nearby multiple systems
suitable for calibrating the empirical mass-luminosity relation for masses
below 0.2 Msun. This has been observed 13 times with FGS3 through Cycle
7. However, use of FGS 1R should clarify the location and nature of a
fainter third component, possibly of 0.1 Msun, detected in two observations
with the less capable FGS3. The observations completed nominally.

1.27 Completed FGS 8335 (Calibrating Stellar Models with the Pleiades:
Resolving the Distance Discrepancy)

The Fine Guidance Sensors were used to make astrometric
observations of the star H923, that is located in the Pleiades
cluster. This is the first phase of a multi-year effort to measure true
masses for low-mass dwarfs in the Pleiades and to determine an accurate
distance to this fundamental cluster. The observations were completed as
scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 28
Successful: 28

Scheduled Re-acquisitions: 21
Successful: 21

2.2 FHST Updates:
Scheduled: 61
Successful: 61

2.3 Operations Notes:

The SSR EDAC error counter was cleared six times, per ROP SR-1A.

Using ROP IC-2, the SSA transmitter was turned on and off on four
occasions.

A TTR was written for a 10-second data loss at 231/2121Z, caused by
concentrator work at IONET.

At 233/172704Z, the NICMOS 28-volt bus voltage (N28VIN1) flagged
out-of-limits for one telemetry sample with a value of 31.608.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW