Second submission.
-249705258
Assigned ID: 7155
----- Attempting Submission 1 (Wed Apr 15 16:18:00 GMT 2026) -----
HST Phase I Proposal 7155 successfully submitted.
Receipt: # 7155-1
----- Attempting Submission 2 (Thu Apr 16 13:17:35 GMT 2026) -----
0
----- Attempting Submission 1 (Tue Aug 18 18:39:30 GMT 2026) -----
TCCT will not run, possibly due to the ongoing partial CDS outage? I have confirmed our targets in the View in Aladin tool, however.
Pathfinding Efficient Unbiased Measurements of Cold H2 in the SMC via Far-UV Extinction
Despite its importance to star formation and to the properties of the ISM in general, it is almost impossible to get direct, unbiased measurements of cold H2 (without costly extreme-UV spectra that no current facility can observe). This forces us to use imperfect proxies, such as CO, which are known to have major systematic errors in different environments -- especially with varying metallicity. However, a recent discovery has revealed that the column density of cold H2 is almost perfectly correlated with the strength of the far-UV rise in the dust extinction curve, apparently because the small dust grains responsible for the FUV rise are also the primary H2 formation sites. We propose using four ACS/SBC filters to observe two fields in the SMC in the FUV, to perform star-by-star measurements of the far-UV rise, and hence H2 column density, towards >135 stars. This program will provide proof-of-concept of this new efficient way of obtaining high-resolution measurements of H2 to inform HWO development -- and it will probe the molecular gas and dust properties towards two low-metallicity regions with prior evidence for CO-dark H2, and striking variations in dust properties.
We note that in the Special Requirements of the Phase I proposal, we requested that these observations are not observed consecutively with any other SBC observations, so that the raised detector temperature does not cause increased dark current. Our targets are in a highly-observable region of the sky, schedulable for about 100 days a year, in multi-week blocks spaced evenly throughout the cycle, so we hope this does not make things difficult for the scheduling team.
There is no GALEX coverage for the bulk of the SMC, and DSS/GSC data provides insufficient spectral information. Therefore, for bright object protection, we used the U-SMAC II catalog (Hota et al., 2024). This is an Astrosat/UVIT/F172M (Tandon et al., 2020) FUV catalog of most of the SMC, including the entire vicinity of our target regions. Assuming a "worst-case scenario" unattenuated O5V spectrum, the SBC screening limit of 50 count/sec/pix in the F125LP filter (our highest-throughput filter) corresponds to UVOT/F172M mag_AB of 17.5. An example of the ETC calculation showing this can be found at ETC Request ID: ACS.im.2366257. No sources with UVIT/F172M mag_AB brighter than 17.5 lie within the 70 arcsecond diameter BOP screening circles centred on each of our target positions. The U-SMAC II catalog can be downloaded from VizieR: http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/AJ/168/255. We are happy to provide additional details of our this BOP analysis, as needed.
Our observations target a number of fields towards two molecular cloud regions in the SMC, N13 and B-1, with 12 and 8 SBC fields respectively. Each SBC field will be observed in F125LP, F140LP, F150LP, and F1650LP. The F165LP, F150LP, and F125LP observations for each field will be done together in one 1-orbit visit (with the filters arranged so that those most susceptible to temperature-induced dark current are observed first, when the instrument will be cooler). The F140LP observations are then done using visits that observe 4 fields in 1 orbit. Our fields are arranged to providing our desired tiling regardless of orient.
PI Christopher Clark is an expert in studying the resolved properties of the ISM in the local Universe, especially dust, through multiwavelength tracers. His publications feature work on mapping the variation in dust properties within nearby galaxies, on exploring what drives variation in ISM characteristics within and between local galaxies at different metallicities, and on producing multiwavelength pipelines to process and analyze observations of nearby galaxies.
Co-PI Christina Lindberg has extensive experience in multi-band SED modeling with a focus on dust extinction mapping in the Magellanic Clouds.
Karl Gordon has studied the dust in the Milky Way and nearby galaxies both in the UV/optical/NIR/MIR via extinction curves and in the infrared via dust emission.
Dries Van De Putte, has prior experience with SED fitting based on imaging photometry and the study of dust variations and their correlations with molecular gas in the Milky Way. Additionally, DVDP is the main author of the work that pointed out the H2-FUV rise scaling relationship, and has previous experience with the development and usage of the BEAST tool.
Claire Murray is an expert in the multiphase interstellar medium traced by radio spectral lines and resolved stellar populations. Murray has extensive experience with planning, executing and analyzing multi-wavelength resolved stellar photometry from HST in the Magellanic Clouds (PIDs 15891, 16235, 16786, 17118).
Karin Sandstrom led the SMIDGE survey which obtained the near-UV to optical photometry of this region. Sandstrom studies gas and dust in the interstellar medium, particularly at low metallicity.
Petia Yanchulova Merica-Jones led the analysis of the SMIDGE survey, including SED fitting and measuring dust extinction.
Stellar Populations and the Interstellar Medium
Galaxies
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The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v16.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v17.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v18.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18362
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:trans-version "20260618"
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(Tic-Orbit
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)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v19.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18362
:visit-id "19"
:proposal-version -1
:trans-version "20260618"
:date "15-Aug-2026 14:34:02.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
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(Tic-Obset
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(Tic-Orbit
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:dark-offset NIL
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:pcs-gap 0
)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v20.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18362
:visit-id "20"
:proposal-version -1
:trans-version "20260618"
:date "15-Aug-2026 14:34:02.0"
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(Tic-Obset
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(Tic-Orbit
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:orbit-number 1
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:pcs-visibility 3121
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)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v21.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18362
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:proposal-version -1
:trans-version "20260618"
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(Tic-Obset
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(Tic-Orbit
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:low-sky "N"
:pcs-visibility 3121
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)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v22.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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:proposal-version -1
:trans-version "20260618"
:date "15-Aug-2026 14:34:03.0"
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(Tic-Obset
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(Tic-Orbit
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:dark-offset NIL
:dark-utilization 0
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:low-sky "N"
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)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v23.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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:proposal-version -1
:trans-version "20260618"
:date "15-Aug-2026 14:34:04.0"
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)
(Tic-Obset
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(Tic-Orbit
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)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v24.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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:visit-id "24"
:proposal-version -1
:trans-version "20260618"
:date "15-Aug-2026 14:44:17.0"
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)
(Tic-Obset
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)
(Tic-Orbit
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:orbit-number 1
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)
true
1
0
/System/Volumes/Data/astro/dust_kg/cclark/HST_SMIDGE_SBC/OP-cache/HST_SMIDGE_SBC_Phase-II-v25.xml
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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:proposal-version -1
:trans-version "20260618"
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)
(Tic-Obset
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(Tic-Orbit
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:orbit-number 1
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:dark-offset NIL
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)
true
1
0