The current Call for Proposals is for HST Cycle 34.
0
Assigned ID: 6963
----- Attempting Submission 1 (Tue Mar 31 13:25:18 GMT 2026) -----
HST Phase I Proposal 6963 successfully submitted.
Receipt: # 6963-1
APT is flagging an error regarding the cycle number. Since this is a JWST Cycle 5 joint JWST-HST program, I was asked to submit it as a Cycle 33 proposal.
Update the ORIENT ranges for Visit 1 in response to the TTRB and Amanda Pagul's advice. The ORIENT ranges (94-184 deg) account for both the spikes and avoid dragon's breath.
-200642000
----- Attempting Submission 1 (Wed Apr 29 22:56:47 GMT 2026) -----
HST Phase II Proposal 18239 successfully submitted.
Receipt: # 18239-1
----- Attempting Submission 2 (Wed May 13 00:31:50 GMT 2026) -----
HST Phase II Proposal 18239 successfully submitted.
Receipt: # 18239-2
----- Attempting Submission 3 (Thu May 28 22:02:08 GMT 2026) -----
Blinded by the Light: Calibrating Outshining Bias in High-z Galaxies with Low-z Starbursting Dwarfs
Stellar mass is the currency of galaxy evolution: it anchors the stellar-halo relation, sets quenching thresholds, shapes the mass-metallicity relation, and underpins galaxy mass functions. Yet at high redshift, where JWST has revealed surprisingly massive galaxies at z > 6, masses from integrated SED fits remain vulnerable to systematics, including "outshining" by young bright stars, bursty SFHs, dust-age-metallicity degeneracy, and nebular emission. A precise, empirical calibration to unbiased masses is urgent and is only possible in nearby systems where JWST resolves individual stars beyond HST limits in near-IR, yielding precise measurements that are immune to outshining.
We will collect deep JWST/NIRCam, HST/WFC3, and archival imaging, spanning near-UV to near-IR bands, of resolved stars in a complete sample of nearby (<4.5 Mpc) starburst dwarf galaxies suitable for our program. These panchromatic data allow us to derive high-precision SFHs from multi-band color-magnitude diagrams (CMDs). Combined with per-star SED fits, we will break key degeneracies and anchor unbiased stellar masses across a range of galaxy mass, metallicity, dust content, and star formation activity. CMD-anchored, unbiased stellar masses serve as ground truth and will be used to calibrate integrated SED fits. Using matched apertures, we will directly compare CMD-based masses to integrated SED inferences, quantify biases as functions of galaxy and SFH properties, and deliver empirical corrections, template SFHs and SEDs for bursty clumps/HII regions, and SFH priors for unresolved systems.
We request 16 HST orbits to image six galaxies using WFC3/UVIS in the F275W and F336W filters, and either WFC3/UVIS or ACS/WFC for F475W. Our strategy maximizes spatial overlap with archival HST and JWST data, though no explicit JWST-HST scheduling coordination is required. These observations are designed to detect intermediate B-type stars with a minimum SNR=4 in the most conservative cases. This depth is sufficient to tightly constrain the recent (<300 Myr) star formation histories (SFHs) of these systems.
Our team combines leading experts in resolved stellar populations in Local Volume galaxies (E. Bell, Y. Choi, A. Dolphin, K. Gilbert, K. Olsen, A. Smercina, B. Williams), and in distant-galaxy photometry and SED modeling (Z. Ji, J. Leja, K. Suess, C. Williams). All necessary software and analysis tools (including DOLPHOT, MATCH, BEAST, Prospector) are in place, but we will stress-test and extend them, establishing a new analysis standand through this program.
The team includes PIs/CoIs of multiple Treasury, large GO, and Archival programs of resolved stellar populations in the Local Volume (e.g., PHAT, PHAST, PHATTER, ANGST, LUVIT, Scylla). We have deep expertise acquiring and reducing joint multi-band JWST+HST imaging of nearby galaxies (A. Smercina, B. Williams), measuring star formation histories via CMD modeling (E. Bell, Y. Choi, A. Dolphin, K. Gilbert, K. Olsen, A. Smercina, B. Williams), and performing per-star SED modeling (Y. Choi). Our team also includes members of many JWST high-z imaging and spectroscopic surveys (e.g., JADES, PANORAMIC, UNCOVER) with specific expertise in spatially resolved integrated SED modeling, including leaders of medium band surveys with this science goal (e.g. JEMS, PI: Williams; MEGASCIENCE, PI: Suess). The team has world leaders in developing novel methodology for SED modeling high-z galaxies (J. Leja) and in using these to advance analysis of spatially resolved SED modeling of high-z galaxies (Z. Ji, K. Suess).
Galaxies
6
false
false
false
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true
SECONDARY
JWST
11571
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SUPPORTED
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STARBURST
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
GALAXY
STARBURST
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
GALAXY
STARBURST
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
GALAXY
STARBURST
This object was generated by the targetselector and retrieved from the SIMBAD database.
MRK178
J2000
J2000
GALAXY
STARBURST
This object was generated by the targetselector and retrieved from the SIMBAD database.
UGC6456
J2000
J2000
GALAXY
STARBURST
This object was generated by the targetselector and retrieved from the SIMBAD database.
UGC4483
J2000
J2000
WFC3/UVIS
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F275W
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:proposal-id 18239
:visit-id "16"
:obset-id "16"
:pcs-mode "FGS"
)
(Tic-Orbit
:cvz T
:proposal-id 18239
:visit-id "16"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 4783
:al-overhead-at-end 116
:internal-dur-at-end 352
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 0
:low-sky "N"
:pcs-visibility 0
:pcs-gap 0
)
true
1
0