17580( 5) - 12-Mar-2026 17:42:14 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17580 Version: 5 Check-in Time: 12-Mar-2026 17:42:14 STScI Edit Number: 0 Title Probing the AGN-Host Relationship in the LINER /CT-AGN NGC 4102 ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Giuseppina Fabbiano Smithsonian Institution Astrophysical Y Observatory CoI: Dr. Martin Elvis Smithsonian Institution Astrophysical N Observatory CoI: Dr. Walter Peter Maksym III NASA Marshall Space Flight Center N CoI: Dr. Alessandro Paggi University of Torino N CoI: Dr. Margarita Karovska Smithsonian Institution Astrophysical N Observatory CoI: Dr. Aneta Siemiginowska Smithsonian Institution Astrophysical N Observatory CoI: Dr. Anna Trindade Falcao NASA Goddard Space Flight Center / ORAU N ------------------------------------------------------------------------------------ Abstract High-resolution Chandra and multi-wavelength maps of the inner regions of nearby active galaxies are revealing an increasingly complex and intriguing picture of the AGN and its multi-faceted interaction with the host galaxy (feedback). We propose a deep probe into the AGN-host relationship in NGC 4102, a luminous LINER and a Compton-Thick (CT) AGN in the near universe (D~17 Mpc, 1''~100pc). With joint Chandra and HST observations, we propose to investigate the properties of the soft extended X-ray emission spatially and spectrally and distinguish between Seyfert, LINER, and star formation powered X-ray emission on scales from ~30pc to 5kpc. The spatial study of the hard X-ray emission (>2.5 keV), may provide key evidence of the interaction of the AGN with thick molecular clouds. ------------------------------------------------------------------------------------ Observations Description ------------------------ We aim to measure [O III], H-alpha, H-beta, the [S II] 6717, 6731 and red & blue continua of NGC 4102. Ratios between continuum-subtracted line maps will be used to make "BPT maps" to diagnose the local ionization state. The overall goals are similar to Programs #15350 (PI: Maksym), #15609 (PI: Fabbiano) and #16837 (PI: Fabbiano), as are the basic strategies. Filters and instruments are comparable to #16837, and it is a WFC3-only program. Our goal is to reach >3-sigma detection for all lines within <1 arcsec of the nucleus. This will require 4 orbits of [O III] (F502N), 4 orbits of H-beta (F487N), 1 orbit of [S II] (F673N) and <1 orbit of H-alpha (F658N). Even the faintest H-alpha regions will be detected at ~23-sigma in one orbit, so we pack the continuua into the H-alpha orbit. Given the number of exposures, it is possible to use a box dither to improve 17580( 5) - 12-Mar-2026 17:42:14 - [ 2] PSF sampling for [O III], H-beta and [S II]. H-alpha and continuum observations are short and use a CR-split. Pre-flash amounts are typically 17, except for F814W (12). [O III] has been re-observed due to a failed observation. H-alpha must also be re-observed, due to a failed observation. Continuum bands from the original visit are fine, only H-alpha is needed. ------------------------------------------------------------------------------------ 17580( 5) - 12-Mar-2026 17:42:14 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-4102 ISM, EMISSION LINE RA=12H06M22.9831S, J2000 Z = V = 11.13 NEBULA, NLR, NUCLEUS DEC=+52D42'40.38" 0.00282 Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Coordinates were refined to the radio nucleus centroid from VLA data. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17580( 5) - 12-Mar-2026 17:42:14 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-GAP-LINE Pattern_Purpose MOSAIC Number_Of_Points 4 Point_Spacing 2.414 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.759 Angle_Between_Sides Center_Pattern YES Pattern_Comments: [S II] dither - 4 points ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-GAP-LINE WFC3-UVIS-DITHER-BOX Pattern_Purpose MOSAIC DITHER Number_Of_Points 4 4 Point_Spacing 2.414 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.759 23.884 Angle_Between_Sides 81.785 Center_Pattern YES NO Pattern_Comments: [O III] and H-beta dither - 4 orbits each, 4 exposures/orbit ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-GAP-LINE Pattern_Purpose MOSAIC Number_Of_Points 2 Point_Spacing 2.414 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.759 Angle_Between_Sides Center_Pattern YES Pattern_Comments: H-alpha packed orbit dither - 2 points ------------------------------------------------------------------------------------------------------------------------------------ 17580( 5) - 12-Mar-2026 17:42:14 - [ 5] Visit: 01 (NGC 4102 [O III]) Visit Requirements: On Hold Comments: Additional Comments: 4 orbits of exposure for NGC 4102 using F502N. The box dither pattern should improve resolution (should it become relevant). We are using CR splits in association with the dither pattern, which may be overkill for cosmic ray removal (no CR splits were used in a similar exposure for NGC 5005) but should be very thorough. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-4102 WFC3/UVI ACCUM UVIS F502N FLASH=17 1 500 S PATTERN 2 1 S see below (10040 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 1 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 2 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 3 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 4 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 1 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 2 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 3 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 4 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 1 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 2 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 3 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 4 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 1 none none 4 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 2 none none 4 627.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 6] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 3 none none 4 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 4 none none 4 627.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 7] Visit: 02 (NGC 4102 H-beta) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-4102 WFC3/UVI ACCUM UVIS F487N FLASH=17 1 500 S PATTERN 2 1 S see below (10040 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 1 1 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 1 2 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 1 3 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 1 4 none none 1 629.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 2 1 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 2 2 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 2 3 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 2 4 none none 2 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 3 1 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 3 2 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 3 3 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 3 4 none none 3 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 4 1 none none 4 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 4 2 none none 4 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 4 3 none none 4 627.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F487N 4 4 none none 4 627.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 8] Visit: 03 (NGC 4102 [S II]) Visit Requirements: On Hold Comments: Additional Comments: 1 orbit of exposure for NGC 4102 using F673N. We are using 4 dithered exposures which should be good for cosmic ray rejection and resolution. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-4102 WFC3/UVI ACCUM UVIS F673N FLASH=17 1 500 S PATTERN 1 1 S see below (2517 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F673N 1 none none none 1 726.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F673N 2 none none none 1 597.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F673N 3 none none none 1 597.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F673N 4 none none none 1 597.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 9] Visit: 04 (NGC 4102 H-alpha) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-4102 WFC3/UVI ACCUM UVIS F673N FLASH=17 1 350 S PATTERN 3 1-3 S see below (708 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-4102 WFC3/UVI ACCUM UVIS F547M FLASH=17 1 350 S S see below (708 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-4102 WFC3/UVI ACCUM UVIS F814W FLASH=12 1 350 S S see below (708 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F673N 1 none none none 1 356.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F673N 2 none none none 1 352.0 S S NGC-4102 2 WFC3/UVI ACCUM UVIS F547M 1 none none none 1 356.0 S S NGC-4102 2 WFC3/UVI ACCUM UVIS F547M 2 none none none 1 352.0 S S NGC-4102 3 WFC3/UVI ACCUM UVIS F814W 1 none none none 1 356.0 S S NGC-4102 3 WFC3/UVI ACCUM UVIS F814W 2 none none none 1 352.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 10] Visit: 05 (NGC 4102 [O III] - re-observe) Visit Requirements: On Hold Comments: Additional Comments: 4 orbits of exposure for NGC 4102 using F502N. The box dither pattern should improve resolution (should it become relevant). We are using CR splits in association with the dither pattern, which may be overkill for cosmic ray removal (no CR splits were used in a similar exposure for NGC 5005) but should be very thorough. This is a re-do of visit #01, which failed. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-4102 WFC3/UVI ACCUM UVIS F502N FLASH=17 1 500 S PATTERN 2 1 S see below (9032 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 1 none none 1 569.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 2 none none 1 569.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 3 none none 1 569.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 1 4 none none 1 569.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 1 none none 2 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 2 none none 2 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 3 none none 2 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 2 4 none none 2 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 1 none none 3 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 2 none none 3 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 3 none none 3 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 3 4 none none 3 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 1 none none 4 563.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 11] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 2 none none 4 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 3 none none 4 563.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F502N 4 4 none none 4 563.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 12] Visit: 06 (NGC 4102 H-alpha - re-observe) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-4102 WFC3/UVI ACCUM UVIS F658N FLASH=17 1 350 S PATTERN 3 1 S see below (708 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-4102 1 WFC3/UVI ACCUM UVIS F658N 1 none none none 1 356.0 S S NGC-4102 1 WFC3/UVI ACCUM UVIS F658N 2 none none none 1 352.0 S S 17580( 5) - 12-Mar-2026 17:42:14 - [ 13] Summary Form for Proposal 17580 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=12, FLASH=17 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 2 1, PATTERN 3 1, PATTERN 3 1-3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F487N, F502N, F547M, F658N, F673N, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-4102 ------------------------------------------------------------------------------------------------------------------------------------