IRAC Instrument Handbook - IRSA - California Institute of Technology
IRAC Instrument Handbook - IRSA - California Institute of Technology
IRAC Instrument Handbook - IRSA - California Institute of Technology
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
iv<br />
<strong>IRAC</strong> <strong>Instrument</strong> <strong>Handbook</strong><br />
5.2.4 Column Pulldown .................................................................................................................................................. 91<br />
5.2.5 Banding Correction (Channels 3 and 4) ........................................................................................................... 91<br />
5.2.6 Muxstripe Correction (Channels 1 and 2) ........................................................................................................ 92<br />
5.3 LEVEL 2 (PO ST -BCD) PIPELINE................................................................................................................................ 94<br />
5.3.1 Pointing Refinement .............................................................................................................................................. 95<br />
5.3.2 Superboresight Pointing Refinement.................................................................................................................. 95<br />
5.3.3 Mosaicking and Coaddition................................................................................................................................. 96<br />
6 Data Products ..........................................................................................................................97<br />
6.1 FILE-NAMING CONVENTIONS ................................................................................................................................... 97<br />
6.2 IRA C SPECIFIC HEADER KEYWORDS ...................................................................................................................... 99<br />
7 Data Features and Artifacts................................................................................................... 103<br />
7.1 DARKS, FLATS AND BAD PIXELS ............................................................................................................................103<br />
7.1.1 Bad Pixels .............................................................................................................................................................105<br />
7.1.2 Flatfield .................................................................................................................................................................106<br />
7.2 ELECT RONIC ART IFACT S .........................................................................................................................................108<br />
7.2.1 Saturation and Nonlinearity ..............................................................................................................................108<br />
7.2.2 Muxbleed (InSb)...................................................................................................................................................110<br />
7.2.3 Bandwidth Effect (Si:As) ....................................................................................................................................112<br />
7.2.4 Column Pull-Down/Pull-Up .............................................................................................................................113<br />
7.2.5 Row Pull-Up .........................................................................................................................................................114<br />
7.2.6 Full-Array Pull-Up..............................................................................................................................................114<br />
7.2.7 Inter-Channel Crosstalk .....................................................................................................................................115<br />
7.2.8 Persistent Images.................................................................................................................................................116<br />
7.2.8.1 Cryogenic Mission Persistent Images ........................................................................................................... 116<br />
7.2.8.2 Warm Mission Persistent Images ................................................................................................................. 118<br />
7.3 OPTICAL ARTIFACT S ................................................................................................................................................120<br />
7.3.1 Stray Light from Array Covers..........................................................................................................................120<br />
7.3.2 Optical Banding and Internal Scattering ........................................................................................................125<br />
7.3.3 Optical Ghosts......................................................................................................................................................126<br />
7.3.4 Large Stray Light Ring and Splotches .............................................................................................................129<br />
7.4 CO SMIC RAYS AND SOLAR PROT ONS.....................................................................................................................130<br />
8 Introduction to Data Analysis ................................................................................................ 134<br />
8.1 POST -BCD DAT A PROCESSING...............................................................................................................................134<br />
8.1.1 Pointing Refinement ............................................................................................................................................134<br />
8.1.2 Overlap Correction .............................................................................................................................................134<br />
8.1.3 Mosaicking <strong>of</strong> <strong>IRAC</strong> Data ..................................................................................................................................135<br />
8.1.3.1 Creating a Common Fiducial Frame.............................................................................................................. 135<br />
8.1.3.2 Outlier Rejection ........................................................................................................................................... 135<br />
8.1.3.3 Mosaicker Output Files................................................................................................................................. 136<br />
8.1.3.4 To Dri zzle or Not to Drizzle? ......................................................................................................................... 136<br />
8.1.3.5 Mosaicking Moving Targets .......................................................................................................................... 136<br />
8.1.4 Source Extraction ................................................................................................................................................137<br />
8.1.4.1 Noise Estimation ........................................................................................................................................... 137<br />
8.1.4.2 PRF Es tima tion .............................................................................................................................................. 137<br />
8.1.4.3 Ba ckground Es ti mation................................................................................................................................. 137<br />
8.1.4.4 Source Extra ction.......................................................................................................................................... 137
Change language