JWST ETC Pandeia GTO CANUCS NIRCam Imaging and the Python engine - - PowerPoint PPT Presentation

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JWST ETC Pandeia GTO CANUCS NIRCam Imaging and the Python engine - - PowerPoint PPT Presentation

Jun 16, 2023 111 likes •296 views

JWST ETC Pandeia GTO CANUCS NIRCam Imaging and the Python engine Dan Coe ESA/AURA Astronomer II NIRCam Instrument Scientist Help Desk Lead JDox Deputy Lead Dan Coe STScI 1 SNR Depends on Aperture Size r = 0.08 (2.5 pixels) r =

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Dan Coe – STScI

JWST ETC Pandeia GTO CANUCS NIRCam Imaging and the Python engine

Dan Coe

ESA/AURA Astronomer II NIRCam Instrument Scientist Help Desk Lead JDox Deputy Lead

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SLIDE 2

Dan Coe – STScI

SNR Depends on Aperture Size

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r = 0.08” (2.5 pixels) annulus: 0.6” – 0.99” r = 0.16” (2.5 pixels) annulus: 1.2” – 1.98” r = 0.1” annulus: 0.22” – 0.4”

photometric aperture sky annulus NIRCam 0.0317” short wavelength pixels 0.0648” long wavelength pixels

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SLIDE 3

Dan Coe – STScI

Selecting a NIRCam Readout Pattern

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MACSJ0416.1-2403 2019-11-30 F200W Default photometric apertures (r = 0.1”; sky annulus 0.22” – 0.4”)

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Dan Coe – STScI

Recommended Readout Patterns

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Dan Coe – STScI

5σ Depth from Interpolation

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5 ~1 hour

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Dan Coe – STScI

Depth vs. Exposure Time

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Requires many loops and interpolations Background: Abell 370 (RA 02:39:50, Dec –01:35:08) 2019-08-30 (similar to Default: Medium RA=0 Dec=0) Short wavelength apertures: r = 0.08”; sky annulus 0.6” – 0.99” Long wavelength apertures: r = 0.16”; sky annulus 1.2” – 1.98”

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Dan Coe – STScI

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JWST ETC Pandeia Python engine example: NIRCam Imaging

https://github.com/dancoe/pandeia-imaging

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Dan Coe – STScI

Cluster galaxies will decrease signal-to-noise for high-redshift galaxies

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Dan Coe – STScI

Backgrounds

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Default is on the ecliptic

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Dan Coe – STScI

Backgrounds

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Similar to the default (RA 02:39:50, Dec –01:35:08)

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Dan Coe – STScI

Backgrounds

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Dan Coe – STScI

Backgrounds

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Dan Coe – STScI

Exposure times defined by readout patterns

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Dan Coe – STScI

Detector completes exposure 1 frame later

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Dan Coe – STScI

Consistent Exposure Times in APT 25.1 and ETC

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Example: 2 integrations, 3 groups, SHALLOW4 2 × (2 × 5 + 4 + 1) = 2 × 15 = 30 frame times = 322.1028 seconds (full detector) single frame time = 10.73676 s (ETC currently assumes 10.74 s → 322.2 total)

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Dan Coe – STScI

9 NIRCam Readout Modes

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  • M. Robberto
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Dan Coe – STScI

NIRCam Readout Modes are Familiar

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WFC3/IR Readout Mode first group (s) subsequent groups (s) SPARS5

2.932

5 SPARS10

2.932

10 SPARS25

2.932

25 SPARS50

2.932

50 SPARS100

2.932

100 SPARS200

2.932

200 NIRCam Readout Mode first group (s) (approx.) subsequent groups (s) (approx.) RAPID

10.7

10.7 BRIGHT

10.7 or 21.4

21.5 SHALLOW

21.5 or 42.9

53.7 MEDIUM

21.5 or 85.9

107.4 DEEP

21.5 or 85.9

214.7

Times for full detectors (not subarrays)