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Assigned ID: 7245
----- Attempting Submission 1 (Thu Apr 16 00:43:47 GMT 2026) -----
HST Phase I Proposal 7245 successfully submitted.
Receipt: # 7245-1
----- Attempting Submission 2 (Thu Apr 16 00:58:05 GMT 2026) -----
HST Phase I Proposal 7245 successfully submitted.
Receipt: # 7245-2
----- Attempting Submission 4 (Thu Apr 16 23:26:29 GMT 2026) -----
HST Phase I Proposal 7245 successfully submitted.
Receipt: # 7245-4
removed the STIS slit angle
2089635197
----- Attempting Submission 1 (Tue Aug 11 14:52:46 GMT 2026) -----
HST Phase II Proposal 18360 successfully submitted.
Receipt: # 18360-1
----- Attempting Submission 2 (Sat Aug 22 02:42:46 GMT 2026) -----
A Pilot HST Reverberation Mapping Campaign for a 30,000 Solar Mass Black Hole
We propose a dedicated photometric reverberation mapping (RM) campaign targeting an intermediate-mass black hole (IMBH) using HST/WFC3 in a 30-day monitoring program. By conducting broad Balmer line RM of a nearby IMBH candidate with a single-epoch BH mass estimate of around 30,000 solar mass, we aim to accurately measure its mass and confirm its IMBH nature. If successful, this would be the second IMBH confirmed via RM, and potentially the lowest-mass BH measured by this method. This campaign will demonstrate HST's unique capability to conduct RM for IMBHs with weak variability and short time lags, serving as a critical proof of concept for future space-based RM efforts.
We request 30 epochs of WFC3/UVIS imaging in three filters: F673N, F438W, and F621M, with exposure times of ~500, 600, and 1,200 seconds per epoch, respectively. Each epoch fits within a single orbit, including all overheads. We also request a two-orbit STIS/G750M spectroscopic visit, with a total exposure time of ~4500 seconds and a spectral resolution of approximately 5,000, to measure the contemporaneous H-alpha line width with a signal-to-noise ratio greater than 10. The program therefore requires 32 orbits in total.
We request a nominal cadence of one epoch per day, with a tolerance of plus or minus 12 hours, over the 30-epoch monitoring campaign. According to the Phase II visibility tool, the target is observable between January 9 and April 27, 2027. If uninterrupted daily monitoring is difficult to schedule, one or two short gaps of 1 to 2 days would remain acceptable and should not significantly affect the lag measurement.
Our team possesses extensive expertise in AGN reverberation mapping (RM) and multi-wavelength analysis, ensuring the successful execution of the IMBH-RM project. Hengxiao Guo (PI) is a specialist in IMBH RM, with significant contributions to major campaigns including LAMP, SAMP, and SDSS-RM, and served as Co-I for HST Cycles 28 and 29. Vivian U (Co-PI), science lead for LAMP 2016, brings deep experience in dwarf galaxy RM. Luis Ho, a member of the US National Academy of Sciences and author of multiple ARA&A reviews, is a preeminent authority on IMBH demographics. Mar Mezcua is a renowned specialist in IMBHs.
The team's core RM capabilities are driven by Paulina Lira, Luka C. Popovic, Dragana Ilic, Andjelka Kovacevic, Shu Wang, and Wenwen Zuo, who collectively provide world-class expertise in accretion disk physics, black hole mass measurements, and advanced time-series analysis. This group is supported by Philip Edwards and Minfeng Gu (radio synergies), Alok Gupta (variability), Paula Sanchez-Saez (VLT RM), Wenke Ren (SED decomposition), and Jingbo Sun (photometry). Finally, Joseph Masiero joins as an expert in survey mission leadership, currently serving as the Science Lead of NEO Surveyor. This synergistic collaboration combines technical innovation with intellectual leadership to define the local IMBH benchmark and decipher the origins of black hole seeds.
Supermassive Black Holes and Active Galaxies
6
false
false
false
false
false
false
false
SUPPORTED
GALAXY
SEYFERT
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
WFC3/UVIS
Imaging
No
No
F438W
WFC3/UVIS
Imaging
No
No
F621M
WFC3/UVIS
Imaging
No
No
F673N
STIS/CCD
Spectroscopic
No
No
G750M
6768
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Timing link suitability includes constraints ([15 After 14 by 0.5 to 1.5 days] [16 After 15 by 0.5 to 1.5 days])
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(Tic-Visit
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Timing link suitability includes constraints ([21 After 20 by 0.5 to 1.5 days] [22 After 21 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
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(Tic-Visit
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Timing link suitability includes constraints ([22 After 21 by 0.5 to 1.5 days] [23 After 22 by 0.5 to 1.5 days])
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(Tic-Visit
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Timing link suitability includes constraints ([23 After 22 by 0.5 to 1.5 days] [24 After 23 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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Timing link suitability includes constraints ([24 After 23 by 0.5 to 1.5 days] [25 After 24 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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Timing link suitability includes constraints ([25 After 24 by 0.5 to 1.5 days] [26 After 25 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
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(Tic-Visit
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Timing link suitability includes constraints ([26 After 25 by 0.5 to 1.5 days] [27 After 26 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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Timing link suitability includes constraints ([27 After 26 by 0.5 to 1.5 days] [28 After 27 by 0.5 to 1.5 days])
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(Tic-Visit
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Timing link suitability includes constraints ([28 After 27 by 0.5 to 1.5 days] [29 After 28 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
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(Tic-Visit
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Timing link suitability includes constraints ([29 After 28 by 0.5 to 1.5 days] [30 After 29 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
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(Tic-Visit
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Timing link suitability includes constraints ([30 After 29 by 0.5 to 1.5 days] [31 After 30 by 0.5 to 1.5 days])
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(Tic-Visit
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Timing link suitability includes constraints ([31 After 30 by 0.5 to 1.5 days])
The scheduling data was generated by CASM 34.2.
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:proposal-id 18360
:visit-id "31"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 124
:internal-dur-at-end 352
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
1
0