JWST Proposal 1234 (Created: Tuesday, March 2, 2021 at 11:00:46 AM Eastern Standard Time) - Overview

1234 - NGC 6822: Dust Life Cycle Study of a Nearby Low Metallicity Cycle: 1, Proposal Category: GTO

INVESTIGATORS Name Institution E-Mail Dir. Margaret Meixner (PI) Universities Space Research Association [email protected] Dr. Olivia Jones (CoI) (ESA Member) United Kingdom Technology Centre [email protected] Dr. Tea Temim (CoI) Space Telescope Science Institute [email protected] Dr. Benjamin Sargent (CoI) Space Telescope Science Institute [email protected] Dr. Bram Ochsendorf (CoI) (ESA Member) GoDataDriven [email protected] Dr. Alec S. Hirschauer (CoI) Space Telescope Science Institute [email protected] Dr. Martha L. Boyer (CoI) Space Telescope Science Institute [email protected] Isha Nayak (CoI) Space Telescope Science Institute [email protected]

OBSERVATIONS Folder Observation Label Observing Template Science Target NGC 6822 6 NGC 6822 NIRCam NIRCam Imaging (3) NGC-6822-NIRCAM NGC 6822 MIRI Mosaic Group 7 NGC 6822 MIRI MIRI Imaging (2) NGC-6822-MIRI 9 NGC 6822 MIRI Split MIRI Imaging (5) NGC-6822-MIRI-TILE-2-COPY off Tile-2

ABSTRACT JWST MIRI and NIRCam will be used to study the life cycle of dust in NGC 6822, in a manner comparable to Spitzer studies of the life cycle of dust in the Large and Small Magellanic clouds (e.g., Meixner et al. 2006; Gordon et al. 2011; Meixner et al. 2013), and I Zw 18. With the spatial resolution and sensitivity afforded by JWST, we will be able to study individual objects in the galaxy NGC 6822 which has a metallicity ([Fe/H] = - 1.2) comparable to that of the SMC. NGC 6822 has been the subject of an HST and ALMA study that detects both post-main sequence and young 1 JWST Proposal 1234 (Created: Tuesday, March 2, 2021 at 11:00:46 AM Eastern Standard Time) - Overview stars. Conditions in this galaxy are thought to be similar to at the peak star formation epoch in the and our study will shed light on the dust life cycle in the early universe. With NIRCam and MIRI, we will be able to study dusty objects, which were not detected by HST. Of particular interest are dust producers. Unlike our galaxy where low- and intermediate mass stars provide substantial dust via mass loss during the asymptotic giant branch (AGB), high galaxies with known large dust content do not have time for stars with masses below 5 solar masses to evolve onto the AGB and produce dust. Recent works show that supernova can produce substantial amount of dust but it is not clear if that will survive the passages of shocks. Hence studies of intermediate-mass and high-mass stars towards the end of their evolution may be key to understanding dust formation in galaxies. NGC 6822 has the brightest HII regions in the nearby universe. The detection of the massive young stellar objects in NGC 6822 will provide insight into the formation of massive stars at low metallicity. Together with the star formation history determinations from HST and the dust mass measurements from the Herschel Space Observatory, we will be able to construct a dust evolution model of this important galaxy.

OBSERVING DESCRIPTION NIRCam & MIRI imaging of NGC 6822

We plan to use the MIRI/NIRCam with parallel imaging mode as follows: NIRcam prime with filters F115W/F356W and F200W/F444W (SW/LW) and MIRI parallel (F1000W, F1500W). MIRI prime with filters F770W, F1000W, F1500W and F2100W and NIRCam parallel (F115W/F356W, F150W /F444W, F200W /F277W, F150W, F140M /F335M). These MIRI filter selections are guided by our study of predicted fluxes of dusty objects (Jones et al. 2017). The NIRCam filters are selected based on prior work on stellar populations and theoretical models convolved with the NIRcam filters.

The depths for the integration were to reach magnitudes of 19.4 at 7.7 microns, 14.4 at 21 microns, and 22.4 at 3.56 microns [vegamags] to match a comparable depth in NGC 6822 as the SAGE project did in the Large and Small Magellanic Clouds. The wavelengths at 3.56 and 7.77 reach below the tip of the red giant branch, and at 21 microns reaches the most massive young stellar objects in this galaxy.

2 Proposal 1234-TargetsNGC6822:DustLifeCycleStudyofaNearbyLowMetallicity Galaxy Fixed Targets Description=[Irregular galaxies] Category=Galaxy Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (5) Description=[Irregular galaxies] Category=Galaxy Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (3) Description=[Irregular galaxies] Category=Galaxy Comments: ThisobjectwasgeneratedbythetargetselectorandretrievedfromSIMBADdatabase. (2) # NGC-6822-MIRI Name COPY NGC-6822-MIRI-TILE-2- NGC-6822-NIRCAM Equinox: J2000 Dec: -144640.85(-14.77801d) RA: 194458.4923(296.2437179d) Equinox: J2000 Dec: -144751.29(-14.79758d) RA: 194456.1990(296.2341625d) Equinox: J2000 Dec: -144820.62(-14.80573d) RA: 194458.0949(296.2420621d) Target Coordinates 3 Epoch ofPosition:2015.5 Epoch ofPosition:2015.5 Epoch ofPosition:2015.5 Targ. Coord.Corrections Miscellaneous Proposal 1234-Observation6NGC6822:DustLifeCycleStudyofaNearbyLowMetallicity Galaxy Spectral Elements Spectral Elements Dithers Mosaic Template Fixed Targets Diagnostics Observation 2 1 MIRI Imaging 2 1 NIRCam Imaging 1 # 2 Rows Subarray: FULL Module: ALL NIRCam Imaging Description=[Irregular galaxies] Category=Galaxy Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (3) # (Visit 6:2)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. (Visit 6:1)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. Coordinated ParallelTemplate(s):MIRIImaging Observing Template:NIRCamImaging Diagnostic Status:Warning Proposal 1234,Observation6:NGC6822NIRCam NGC-6822-NIRCAM Name F1500W F1000W Filter F200W F115W Short Filter FULLBOX Primary DitherType 1 Columns FAST FAST Readout Pattern F444W F356W Long Filter Equinox: J2000 Dec: -144751.29(-14.79758d) RA: 194456.1990(296.2341625d) Target Coordinates 34 34 Groups/Int 4TIGHT Primary Dithers 10.0 Row Overlap% Readout Pattern BRIGHT2 BRIGHT2 1 1 Integrations/Exp Groups/Int 4 4 Dither Size 10.0 Column Overlap% 1 1 Exposures/Dith 4 Epoch ofPosition:2015.5 Targ. Coord.Corrections Subarray: FULL MIRI Imaging Integrations/Exp 1 1 Dither 1 Subpixel Positions 0.0 Row shift Total Integrations 12 12 12 12 Total Dithers 12 12 Total Dithers F770W 3-POINT-WITH-MIRI- Subpixel Selector Coordinated Parallel 0.0 Column shift 12 12 Integrations Total Miscellaneous 1030.73 1030.73 Time Total Exposure 1132.216 1132.216 Time Total Exposure Tue Mar0216:00:46GMT2021 NO_DITHERING Primes Dither DirectImages DEFAULT Tile Order ID ETC Wkbk.Calc ID ETC Wkbk.Calc Proposal 1234-Observation6NGC6822:DustLifeCycleStudyofaNearbyLowMetallicity Galaxy Special Requirements No Parallel Visits SamePA Aperture PARange93toDegrees(V393.1125512493.11255124) Group Visitswithin53.0Days 5 Proposal 1234-Observation7NGC6822:DustLifeCycleStudyofaNearbyLowMetallicity Galaxy Spectral Elements Dithers Mosaic Template Fixed Targets Diagnostics Observation 4 3 2 1 # 4 3 2 1 # 1 Rows FULL Subarray Description=[Irregular galaxies] Category=Galaxy Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (2) # (Visit 7:5)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. (Visit 7:4)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. (Visit 7:3)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. (Visit 7:2)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. (Visit 7:1)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. Observing Template:MIRIImaging Diagnostic Status:Warning Proposal 1234,Observation7:NGC6822MIRI NGC-6822-MIRI Name F2100W F1500W F1000W F770W Filter CYCLING CYCLING CYCLING CYCLING Dither Type 6 Columns FAST FAST FAST FAST Readout Pattern 1 1 1 1 Starting Point Equinox: J2000 Dec: -144820.62(-14.80573d) RA: 194458.0949(296.2420621d) Target Coordinates 20 15 36 52 Groups/Int 10.0 Row Overlap% 4 4 4 Number ofPoints 4 9 8 2 1 Integrations/Exp Points 10.0 Column Overlap% 1 1 1 1 Exposures/Dith 6 Epoch ofPosition:2015.5 Targ. Coord.Corrections Starting Set Dither 4 Dither 3 Dither 2 Dither 1 Dither 0.0 Row shift Number ofSets 4 4 4 4 Total Dithers Optimized For 0.0 Column shift 36 32 8 4 Integrations Total Miscellaneous Direction 1998.029 1332.019 799.212 577.208 Time Total Exposure Tue Mar0216:00:46GMT2021 HILBERT_CURVE Tile Order SMALL SMALL SMALL SMALL Pattern Size ID ETC Wkbk.Calc Proposal 1234-Observation7NGC6822:DustLifeCycleStudyofaNearbyLowMetallicity Galaxy Special Requirements Group Observations7,9within53Days No Parallel Visits SamePA Aperture PARange93toDegrees(V388.1657467688.16574676) Group Visitswithin53.0Days 7 Proposal 1234-Observation9NGC6822:DustLifeCycleStudyofaNearbyLowMetallicity Galaxy Spectral Elements Dithers Template Fixed Targets Diagnostics Observation 4 3 2 1 MIRI Imaging 4 3 2 1 # Subarray: FULL MIRI Imaging Description=[Irregular galaxies] Category=Galaxy Comments: Thisobjectwasgeneratedbythetargetselectorandretrieved fromtheSIMBADdatabase. (5) # (Visit 9:1)Warning(Form):OverheadsareprovisionaluntiltheVisitPlanner hasbeenrun. Coordinated ParallelTemplate(s):NIRCamImaging Observing Template:MIRIImaging Diagnostic Status:Warning Proposal 1234,Observation9:NGC6822MIRISplitoffTile-2 COPY NGC-6822-MIRI-TILE-2- Name F2100W F1500W F1000W F770W Filter NIRCam F2100W-WITH- 4-POINT-MIRI- NIRCam F1500W-WITH- 4-POINT-MIRI- NIRCam F1000W-WITH- 4-POINT-MIRI- NIRCam F770W-WITH- 4-POINT-MIRI- Dither Type FAST FAST FAST FAST Readout Pattern 1 1 1 1 Starting Point Equinox: J2000 Dec: -144640.85(-14.77801d) RA: 194458.4923(296.2437179d) Target Coordinates 20 15 36 52 Groups/Int 4 4 4 Number ofPoints 4 9 8 2 1 Integrations/Exp Points 1 1 1 1 Exposures/Dith 8 Epoch ofPosition:2015.5 Targ. Coord.Corrections Subarray: FULL Module: ALL NIRCam Imaging Starting Set Dither 4 Dither 3 Dither 2 Dither 1 Dither Number ofSets 4 4 4 4 Total Dithers Optimized For 36 32 8 4 Integrations Total Miscellaneous Direction 1998.029 1332.019 799.212 577.208 Time Total Exposure Tue Mar0216:00:46GMT2021 SMALL SMALL SMALL SMALL Pattern Size ID ETC Wkbk.Calc Proposal 1234-Observation9NGC6822:DustLifeCycleStudyofaNearbyLowMetallicity Galaxy Special Requirements Spectral Elements Group Observations7,9within53Days No Parallel Aperture PARange93toDegrees(V388.1657467688.16574676) 4 3 2 1 NIRCam Imaging F140M F200W F150W F115W Short Filter F335M F444W F277W F356W Long Filter SHALLOW4 BRIGHT2 BRIGHT2 BRIGHT2 Readout Pattern 8 4 4 4 Groups/Int 9 1 1 1 1 Integrations/Exp 4 4 4 4 Total Integrations 4 4 4 4 Total Dithers 1674.936 343.577 343.577 343.577 Time Total Exposure ID ETC Wkbk.Calc