Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_00/hst_status_09_13_00 Дата изменения: Wed Sep 13 14:31:00 2000 Дата индексирования: Sun Dec 23 10:16:38 2007 Кодировка: Поисковые слова: seyfert galaxy

HUBBLE SPACE TELESCOPE

DAILY REPORT #2706

PERIOD COVERED: 0000Z (UTC) 09/12/00 - 0000Z (UTC) 09/13/00

Daily Status Report as of 257/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed 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.

1.2 Completed STIS/CCD/MA2 8096 (The Interstellar Medium Near To And
Beyond The Galactic Center)

The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
observe a B-type supergiant, LS 4825, which lies on the far side of the
Galaxy, at a galactocentric distance of R_G = 12 kpc, and whose sightline
passes within 1 kpc of the Galactic Center. Optical ionCa2 and ionNa1
interstellar observations of LS 4825 reveal a miriad of intermediate and
high velocity clouds, several of which arise from gas near to and beyond
the Galactic Center. We propose to obtain medium resolution STIS spectra,
primarily to observe the ultraviolet interstellar lines towards LS
4825. The observations completed nominally.

1.3 Completed Two 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.

1.4 Completed STIS/CCD 8838 (Bias Monitor - Part 1)

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 nominally.

1.5 Completed STIS/MA1 8426 (Cycle 8 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA1) 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.

1.6 Completed WF/PC-2/STIS/CCD/MA1 8565 (Where Does Lyman Alpha Escape
from Galaxy Disks?)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD and
MA1) were used to observe the frequent detection of Lyman Alpha emission at
high redshifts and to understand how it arises in nearby galaxies. Despite
the obstacles posed by radiative transfer, empirically the significant
Lyman Alpha emerges from some nearby galaxies. Data on M33, in particular,
suggest that much of this escape could be from the diffuse ISM rather than
from H II regions specifically, an idea with some theoretical attraction as
well. The observations completed with no reported problems.

1.6 Completed STIS/CCD 8259 (The Origin of Blue Wings on NLR Line Profiles)

The Space Telescope Imaging Spectrograph (CCD) was used to attempt
understanding the kinematics of the Narrow Line Region {NLR} in Seyfert
galaxies. The observational signature being looked for is the famous `blue
wing' found on the OIIILambda5007 lines of almost all Seyfert
galaxies. The proposal completed with no reported problems.

1.8 Completed WF/PC-2 8110 (Supernova Remnants in a Cloudy Interstellar
Medium)

The WF/PC-2 was used to observe small cloudlets in the interstellar
medium {ISM} that may have a marked effect on the physical structure and
evolution of supernova remnants {SNRs}. These WFPC2 images can be combined
with complementary observations in other wavelength regimes to identify
cloudlets inside remnants, trace SNR shock fronts, determine the physical
parameters of interior cloudlets and compare them to those of the hot
interior, and investigate the evaporation of shocked cloudlets into the hot
cavities of the SNRs. There were no reported problems.

1.9 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby
Galaxies - Imaging and Spectroscopy)

The Space Telescope Imaging Spectrograph (CCD) was used to make
parallel observations of nearby galaxies. This survey will be useful to
study the star formation histories, chemical evolution, and distances to
these galaxies. These data will be placed immediately into the Hubble Data
Archive. The observations were completed as scheduled, and no problems
were reported.

1.10 Completed Two 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

1.11 Completed WF/PC-2 8682 (A Snapshot Study of 0bservational Cosmology)

The WF/PC-2 was used to examine the observational constraints on
the cosmic star formation history that is currently among the most active
fields in observational cosmology. The most widely used tracer of the
co-moving volume-averaged star formation rate {SFR} is the UV luminosity
density, which early results found to peak at z~1- 2. The apparent
identification of the primary epoch of metal production and star formation
in the Universe led to intense theoretical and observational
interest. Nevertheless, and remarkably for such a fundamental observation,
little is known about the history of star formation in the Universe beyond
its global average. There were no reported anomalies.

1.12 Completed WF/PC-2 8597 (The Fueling of Active Nuclei: Why are
Active Galaxies Active?)

The WF/PC-2 was used to investigate the accretion onto massive
black holes that are believed to be the energy source for AGN. However,
evidence for black holes in quiescent galaxies has also been reported. Why
are these galaxies inactive? One possibility is that active galaxies are
better at providing fuel to the nuclear region than quiescent
galaxies. Other possible fueling mechanisms such as ``bars-within-bars''
or nuclear spirals cannot be investigated from the ground because they are
relatively small features in the ISM. The observations were completed as
planned.

1.13 Completed 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.

1.14 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

1.15 Completed 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.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 12
Successful: 12

Scheduled Re-acquisitions: 7
Successful: 7

2.2 FHST Updates:
Scheduled: 24
Successful: 24

2.3 Operations Notes:

The STIS MCE-1 reset at 256/125026Z while the low voltage was on
and while outside any SAA interval. The STIS flight software error counter
was reset at 256/1259Z per ROP NS-12. MAMA-1 was recovered at 256/1406Z
via normal SMS commanding.

Using ROP SR-1A, the SSR EDAC error counter was cleared at 257/0503Z.

The 486 engineering status buffer limit for SESBSLD was adjusted at
257/0922Z, using ROP DF-18A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/CAW