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Hubble Space Telescope
NICMOS STScI Analysis Newsletter 26


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              |  N   N IIIII CCCCC M       M OOOOOO   SSS  |
  STScI       |  NN  N   I   CC    MM     MM OO  OO  SS    | STAN - NICMOS
  Analysis    |  N N N   I   CC    M M   M M OO  OO   SS   | Number 26
  News        |  N  NN   I   CC    M  M M  M OO  OO    SS  | January 2002
              |  N   N IIIII CCCCC M   M   M OOOOOO  SSS   |
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CONTENTS:


        - NICMOS NEWS
          + NICMOS Patterns Available for Cycle 11
          + Phase 2 Advisory: Long Wavelength NICMOS Observations
          + Updated NICMOS Static Bad Pixel Masks

        - RECENT PREPRINTS

        - APPENDIX:  NICMOS CONTACTS

============================================================================

                                NICMOS NEWS
                                -----------

NICMOS Patterns Available for Cycle 11
--------------------------------------
A.B. Schultz, D. Calzetti, F. Tanner

NICMOS patterns are now supported for use by General Observers (GO)
for completing their Cycle 11 Phase II proposals. It was recently
discovered that the NICMOS patterns were not supported by RPS2, and
a check revealed that the proposal instructions simply were not 
updated to change the patterns from restricted to supported, 
a software switch. RPS2 version 11.1 supporting the NICMOS patterns
for GOs will be available via FTP after January 21, 2002.

The easiest way to specify a NICMOS pattern is through the RPS2
proposal editor (PED), but you can also simply fill out the pattern
form in the RPS2 template (and the syntax will be checked by the
Syntax checker within RPS2). Regardless of how you choose to
type the pattern syntax, it is important to read Chapter 8 of the
Phase II Proposal Instructions to understand how to use patterns.
Additional information specifically about the NICMOS patterns can
be found in Chapter 11 of the NICMOS Instrument Handbook.

The NICMOS predefined patterns are similar to those used by Cycle
7 NICMOS observers. In Cycle 7 the patterns were specified using
Optional Parameters, but now they are specified in a separate
pattern block and tied to a specific exposure through a new
Special Requirement. The new pattern structure has extended the
pattern capability to allow multiple filter exposures to execute
at each pattern position. Thus, observers can obtain multiple
filter exposures at each pattern position without repeating the
pattern for each filter. In addition, the new pattern structure
allows the selection of the pattern coordinate frame: instrument
POS-TARG or celestial, as well as selection of spacing size and 
orientation. 

There are 12 supported NICMOS patterns. Seven patterns use the
instrument POS-TARG coordinate frame:
NIC-ONE-CHOP, NIC-TWO-CHOP, NIC-SPIRAL-DITH, NIC-SPIRAL-DITH-CHOP,
NIC-SQUARE-WAVE-DITH, NIC-XSTRIP-DITH, and NIC-YSTRIP-DITH,
and five patterns use the celestial coordinate frame:
NIC-MAP, NIC-SPIRAL-MAP, NIC-SKY-ONE-CHOP, NIC-SKY-TWO-CHOP,
and NIC-SKY-SPIRAL-DITH-CHOP.

There are also a few nested patterns which use both a primary and
secondary pattern. NIC-SKY patterns use the celestial coordinate
frame for both the primary and secondary patterns. However, pattern
NIC-SKY-SPIRAL-DITH-CHOP has coordinate frame POS-TARG for the
primary pattern and the celestial coordinate frame for the secondary
pattern.

It should be noted that patterns that allow dithering and chopping 
simultaneously (e.g., NIC-SPIRAL-DITH-CHOP) do not allow to select 
the orients of the dither pattern and of the chop pattern independently.  

Three patterns, which are not supported for Cycle 11, are
underdevelopment and will be supported for Cycle 12:
NIC-XSTRIP-DITH-CHOP, NIC-YSTRIP-DITH-CHOP,
and NIC-SKY-XSTRIP-DITH-CHOP.  

The NICMOS predefined patterns have been implemented to assist the
observer in preparing Phase II observations. It is recommended that
NICMOS observers use one of the supported NICMOS patterns. However,
if the predefined patterns are not sufficient for a particular set
of observations, then observers can specify their own pattern 
using the generic line and spiral patterns.

The following is an example Phase II pattern specification for the
NICMOS pattern NIC-SPIRAL-DITH:

Pattern_Data

  Pattern_Number: 1
  Primary_Pattern:
  Pattern_Type: NIC-SPIRAL-DITH
  Pattern_Purpose: DITHER
  Number_Of_Points: 4
  Point_Spacing: 9.766
  Coordinate_Frame: POS-TARG
  Pattern_Orient: 0.11
  Center_Pattern: NO


Phase 2 Advisory: Long Wavelength NICMOS Observations
-----------------------------------------------------
K. Noll

Observations of extended sources in the thermal regime (longward of 1.8 
micron) may need to obtain background observations, by chopping off the 
target. Given the stability of the thermal background, however, it will 
not be necessary to get background measurements more frequently than once 
per orbit. For point sources or extended sources which do not fill the 
camera field-of-view, images of the thermal background can be obtained with
dithering (see also the NICMOS Instrument Handbook, page 15).


Updated NICMOS Static Bad Pixel Masks
-------------------------------------
M. Sosey

An analysis of the on-orbit darks taken from March 1997 - January 1999
with the objective of creating new static bad pixel masks has been
completed. The main products of this anaylsis will include updated masks
for all cameras, as well as new flatfield reference images. The new flat
fields will be processed with the recently updated linearity calibration
files as well as temperature dependant darks and the new mask files.
All new reference files should be delivered to CDBS before the start
of SMOV activities and will be applicable to datasets taken prior
to 1999. For more detailed information see NICMOS ISR 2002-001.


=============================================================================

                         RECENT PREPRINTS
                         ----------------

We draw your attention to these papers, based on NICMOS data, that
will appear in the next few months.  This list includes all preprints
received by the STScI Library not yet published in the journals.
Please remember to include our Library in your preprint distribution list.


COLINA, L.; BORNE, K.; BUSHOUSE, H.; LUCAS, R.A.;
ROWAN-ROBINSON, M.; LAWRENCE, A.; CLEMENTS, D.;
BAKER, A.; OLIVER, S. "Ultraluminous Infrared
Galaxies: Mergers of Sub-L* Galaxies?" ApJ 563:
546-554, 2001
http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001ApJ...563..546C

HARVEY, D.W.A.; WILNER, D.J.; LADA, C.J.; MYERS,
P.C. "Structure of Protostellar Collapse Candidate
B335 Derived from Near-Infrared Extinction Maps"
ApJ 563: 903-918, 2001
http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001ApJ...563..903H

LEE, J.-W.; CARNEY, B.W.; FULLTON, L.K.; STETSON,
P.B. "Near-Infrared Photometry of Globular Clusters
NGC 6287 and NGC 6341 (M92): the Formation of the
Galactic Halo" AJ 122: 3136-3154, 2001
http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001AJ....122.3136L

REJKUBA, M.; MINNITI, D.; SILVA, D.R.; BEDDING,
T.R. "Stellar Populations in NGC 5128 with the VLT:
Evidence for Recent Star Formation" A&A 379:
781-797, 2001
http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001A%26A...379..781R

SCOVILLE, N.Z.; POLLETTA, M.; EWALD, S.; STOLVOVY,
S.R.; THOMPSON, R.; RIEKE, M. "High-Mass, OB Star
Formation in M51: Hubble Space Telescope H alpha
and Pa alpha Imaging" AJ 122: 3017-2045, 2001
http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001AJ....122.3017S

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                     APPENDIX: NICMOS Contacts
                     -------------------------

Analysis, STSDAS or any other HST-related questions can be
addressed to help@stsci.edu.
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