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JWST/NIRCam Simulated Data

Created by: Bryan Hilbert and the NIRCam Team

The following data products were created with the NIRCam data-ramp simulator for the imaging configuration. Inputs to the simulator include:

• a real NIRCam dark current ramp from CV3 testing
• a list of star & galaxy sources, and cosmic rays that were included in the fields
• the choice of filter and the associated system throughput curve
• the RA and Dec of the pointing

The data include exposures simulated using:

• Module A
• both channels
• 2 dither positions

The SHORT channel used filter F210M and the LONG channel used F335M. The data include multiple levels of processing from raw to calibrated count-rate images. For more information about the simulation, see the README file.

The data are stored in multi-extension FITS files using an SSB data model[1], to assure agreement with the format and content expected of a Level-1b exposure. An exposure prepared in this way can be run through the Level-2 and Level-3 pipelines.

Data Files

Use the links in the following table to download the files of interest.

NIRCam Image Simulation Data Files

File	Size	Position	Description
Ch: SHORT; Filter: F210M
nrca4_dith1_uncal.fits	1.92 GB	1	Raw file (Level_1b)
nrca4_dith1_rate.fits	50.4 MB	1	Count-rate file (Level-2a)
nrca4_dith1_rateints.fits	252 MB	1	3D countrate exposure data cube (Level-2a)
nrca4_dith1_cal.fits	67.2 MB	1	Calibrated count-rate file (Level-2b)
nrca4_dith1_rateints_cal.fits	268 MB	1	Calibrated 3D countrate exposure data cube (Level-2b)
nrca4_dith2_uncal.fits	1.92 GB	2	Raw file (Level_1b)
nrca4_dith2_rate.fits	50.4 MB	2	Count-rate file (Level-2a)
nrca4_dith2_cal.fits	67.2 MB	2	Calibrated count-rate file (Level-2b)
Ch: LONG; Filter: F335M
nrca5_dith1_uncal.fits	1.92 GB	1	Raw file (Level_1b)
nrca5_dith1_rate.fits	50.4 MB	1	Count-rate file (Level-2a)
nrca5_dith1_cal.fits	67.2 MB	1	Calibrated count-rate file (Level-2b)
nrca5_dith2_uncal.fits	1.92 GB	2	Raw file (Level_1b)
nrca5_dith2_rate.fits	50.4 MB	2	Count-rate file (Level-2a)
nrca5_dith2_cal.fits	67.2 MB	2	Calibrated count-rate file (Level-2b)
Full Data Set
sim_ncam_full.tgz	2.35 GB	All	Bundle of all .fits files

 

The following lists specify the positions and other attributes of the sources; all files are in ASCII.

Simulation Source Lists

File	Position	Description
Lists.tgz	All	Unix g-zipped tar of all lists
galaxies.list	All	Galaxy master list
point_sources.list	All	Point-source master list
Ch: SHORT
nrca4_dith1_CR.list	1	Cosmic-ray list
nrca4_dith1_gal.list	1	Galaxy list
nrca4_dith1_ps.list	1	Point-source list
nrca4_dith2_CR.list	2	Cosmic-ray list
nrca4_dith2_gal.list	2	Galaxy list
nrca4_dith2_ps.list	2	Point-source list
Ch: LONG
nrca5_dith1_CR.list	1	Cosmic-ray list
nrca5_dith1_gal.list	1	Galaxy list
nrca5_dith1_ps.list	1	Point-source list
nrca5_dith2_CR.list	2	Cosmic-ray list
nrca5_dith2_gal.list	2	Galaxy list
nrca5_dith2_ps.list	2	Point-source list

[1]The format, organization, and content of the data files offered here is consistent with the DMS baseline ca. 2017 March.

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