0
Assigned ID: 6632
----- Attempting Submission 1 (Thu Apr 10 19:30:57 GMT 2025) -----
Updated exposure times to leave 70s unused time for each orbit
1543021745
----- Attempting Submission 1 (Wed Aug 13 18:11:59 GMT 2025) -----
----- Attempting Submission 2 (Fri Sep 05 19:42:09 GMT 2025) -----
Testing the Mass Threshold of Reionization-Quenching with Isolated Dwarf Galaxy Hedgehog
Cosmic reionization has long been thought to quench star formation in low-mass dwarf galaxies. However, no direct observational evidence exists beyond satellites of the Local Group. The mass range where reionization quenching is dominant remains elusive. We request HST WFC3/UVIS imaging in F606W+F814W for Hedgehog, a newly discovered isolated quiescent dwarf galaxy at 2.4 Mpc. Having no neighbors within 1 Mpc, Hedgehog's evolution was very likely unaffected by environmental effects, making it preserve the cleanest possible signature of reionization quenching. Compared with other ultra-faint dwarfs, Hedgehog's relatively high stellar mass (6x10^5 Msun) makes it particularly valuable for understanding the mass threshold of reionization quenching. A deep color-magnitude diagram analysis will reveal its ancient star formation history by resolving the horizontal branch, a key feature of the oldest, most metal-poor stellar populations.
Our observations will provide a decisive test of reionization's impact on galaxy evolution at the critical mass threshold (M* ~ 10^5-10^6 Msun). Alternatively, if Hedgehog is a backsplash satellite from the Centaurus~A group, it would be the most distant backsplash galaxy ever confirmed, revealing the dynamical history of the nearby Centaurus A group and offering tests for backsplash models.
The goal of this proposal is to measure the star formation history (SFH) of a newly discovered dwarf galaxy named "Hedgehog" from a deep color-magnitude diagram (CMD) of stars within it. With the total allocated 30 orbits, we will definitively distinguish the two quenching mechanisms -- reionization quenching and backsplash quenching -- for this isolated quiescent dwarf galaxy.
We request HST WFC3/UVIS imaging in F606W and F814W using the UVIS2 aperture. Each visit has two orbits, and each orbit is split between F606W and F814W exposures (with no CR-splits). Small dithers are performed between orbits using POS-TARG following a 4-point DITHER-BOX pattern.
We do not add any constraints on the orientation. The bright star near the target will be saturated, but the diffraction spikes will have a length of ~10 arcsec, shorter than the angular size of the target galaxy (30 arcsec) and thus would not significantly affect the analysis.
PI Li is an expert on studying dwarf galaxies in the Local Volume. Li recently discovered one of the most isolated quiescent dwarf galaxies, Hedgehog (Li+2024). Li has rich experience in characterizing properties of dwarf galaxies in optical imaging data.
Co-I Danieli is an expert in detecting and studying low surface brightness galaxies using ground and space-based observations. She led HST programs that image and analyze dwarf galaxies, including stellar photometry, stellar population studies, and TRGB analyses. She also co-developed the software package ArtPop for synthesizing stellar populations and simulating realistic CMDs and images of stellar systems.
Co-I Greene has been studying dwarf galaxies for her entire career, with strong experience in large imaging surveys and low surface brightness dwarf searches.
Co-I Carlsten has experience in finding and characterizing nearby dwarf galaxies. In particular, Carlsten has done significant work in elucidating the effect of environment on dwarf galaxy evolution.
Co-I Telford is an experienced HST user and an expert in the resolved stellar populations of nearby galaxies (Telford+ 2019, 2020, PI of HST-AR-16155).
Co-I Savino has rich experience in reconstructing star formation histories of nearby dwarf galaxies using HST imaging data.
Co-I Lin is experienced with galaxy evolution and stellar population analysis using HST data and has the expertise in interpreting the reionization quenching in a cosmological context.
Galaxies
Stellar Populations and the Interstellar Medium
6
false
false
false
false
false
false
SUPPORTED
GALAXY
DWARF ELLIPTICAL
LSB
YES
J2000
J2000
WFC3/UVIS
Imaging
No
No
F606W
WFC3/UVIS
Imaging
No
No
F814W
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)
(Tic-Orbit
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(Tic-Orbit
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true
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/Users/jiaxuanl/Princeton Dropbox/Li Jiaxuan/Research/Proposals/Hedgehog_HST/OP-cache/phase2_update-v14.xml
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CASM was run in Phase II mode.
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/Users/jiaxuanl/Princeton Dropbox/Li Jiaxuan/Research/Proposals/Hedgehog_HST/OP-cache/phase2_update-v15.xml
The scheduling data was generated by CASM 33.1.
CASM was run in Phase II mode.
(Tic-Visit
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(Tic-Obset
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(Tic-Orbit
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(Tic-Orbit
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true
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