--------------+--------------------------------------------+---------------- | 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 20 News | N NN I CC M M M M OO OO SS | October 1999 | N N IIIII CCCCC M M M OOOOOO SSS | --------------+--------------------------------------------+---------------- CONTENTS: - NICMOS NEWS + NICMOS Software Task Updates in STSDAS Version 2.1 - RECENT PREPRINTS - APPENDIX: NICMOS CONTACTS ============================================================================ NICMOS NEWS ----------- NICMOS Software Task Updates in STSDAS Version 2.1 -------------------------------------------------- by Howard Bushouse STSDAS version 2.1 was publically released on October 9, 1999. This release contains changes to several NICMOS-related software tasks. The calnica calibration task has been updated to version 3.3. This version contains the following changes: 1) A new calibration step, BARSCORR, has been added, which is designed to search for and flag pixels in individual readouts of a Multiaccum exposure that are affected by the electronic "bars" image anomaly. The step can be controlled by adding the new calibration switch keyword "BARSCORR" to the primary headers of raw data files, but it will be executed automatically for Multiaccum images if this switch is not present in the image headers. 2) The capability has been added to reject a user-selected number of initial readouts from a Multiaccum image in the CRIDCALC image combination and cosmic-ray rejection step. This is often useful for removing the effects of imcomplete shading removal by the DARKCORR calibration step. The number of samples to reject is set via the new task parameter "samprej". 3) All operations throughout calnica that convert data from units of counts to countrates (and vice versa) have been modified to use the exposure time per pixel data in the TIME image extensions, rather than the value of the SAMPTIME header keyword. 4) The NOISCALC step has been enhanced to estimate and account for "shading" signal when estimating noise in the detected signal in an image. In order to accomplish this, this step must now use data from the DARKFILE reference file, in addition to the NOISFILE reference file. This leads to much improved noise estimates, especially for camera 2 (which has the strongest shading signal). The improved noise estimates in turn allow for more robust cosmic-ray rejection in the CRIDCALC step. 5) The NLINCORR step has been upgraded to accomodate the use of 2nd-order correction schemes, in addition to the existing 1st-order scheme. The calnicb calibration task has been upgraded to version 2.3.1 and contains minor bug fixes and internal modifications only. The pstack task in the nicmos package has been upgraded to allow reading and plotting data from any of the five types of image extensions (SCI, ERR, DQ, SAMP, TIME), plotting in either units of counts or countrates, and the option of saving the data to an output text file. Finally, the NICMOS data reduction and analysis tasks that were released earlier this year in the "nicproto" add-on package to IRAF (see NICMOS STAN-018, July 199) are now available in the standard nicmos package of STSDAS v2.1. If you had previously installed the nicproto package, you should remove it after upgrading to STSDAS v2.1 in order to avoid the chance of conflicts. ============================================================================= 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. REIPURTH, B.; YU, K.C.; RODRIGUEZ, L.F.; HEATHCOTE, S.; BALLY, J. "Multiplicity of the HH 111 Jet Source: Hubble Space Telescope NICMOS Images and VLA Maps" A&A accepted DICKINSON, M.; HANLEY, C.; ELSTON, R.; EISENHARDT, P.R.; STANFORD, S.A.; ADELBERGER, K.L.; SHAPLEY, A.; STEIDEL, C.C.; PAPOVICH, C.; SZALAY, A.S.; BERSHADY, M.A.; CONSELICE, C.J.; FERGUSON, H.C.; FRUCHTER, A.S. "The Unusual Infrared Object HDF-N J123656.3+621322" ApJ accepted SCHULTE-LADBECK, R.E.; HOPP, U.; GREGGIO, L.; CRONE, M.M. "A Near-Infrared Stellar Census of the Blue Compact Dwarf Galaxy VII Zw 403" AJ accepted astro-ph/9909216 ============================================================================ APPENDIX: NICMOS Contacts ------------------------- Any questions about the scheduling of your observations should be addressed to your Program Coordinator. Post-Observation questions can be addressed to your Contact Scientist. If you do not know who these persons are, you can find the information on the WWW at http://www.stsci.edu/public/propinfo.html. Analysis, STSDAS or any other HST-related questions can also be addressed to help@stsci.edu. ============================================================================ To subscribe or unsubscribe send a message to majordomo@stsci.edu with the Subject: line blank and the following in the body: [un]subscribe nicmos_news ============================================================================ Comments, questions, suggestions, etc. can be e-mailed to help@stsci.edu. ============================================================================ The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. ============================================================================