0 Submission failed due to error communicating with the submission server. Please retry in a few minutes. If this error persists please contact the help desk at apt@stsci.edu. Assigned ID: 6913 ----- Attempting Submission 1 (Tue Aug 26 21:11:59 GMT 2025) ----- FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser 0 ----- Attempting Submission 1 (Thu Oct 02 13:31:54 GMT 2025) ----- This is a short exposure in 814 in case it is saturated. We propose a 50 ks Chandra ACIS observation to resolve X-ray emission in the merging Seyfert 2 galaxy 2MASX J22373491-1925343, which exhibits dual narrow-line [Ne V] 3426 A emission, a hallmark of AGN activity. Keck/KCWI data reveal two distinct [Ne V] regions, suggesting either a dual AGN or a single AGN illuminating multiple gas structures. Chandra's subarcsecond resolution will determine whether both nuclei are X-ray bright and assess their obscuration, providing the first X-ray-confirmed dual AGN detected in [Ne V]. We also request 2 HST orbits (F814W/F160W) to map stellar structures and extinction. This study will refine [Ne V] as an AGN tracer and inform JWST high-z AGN searches. T The goal of this program is to search for two sources of extended emission potentially associated with dual [Ne V] emission from black holes, using the i-band and H-band with WFC3. The WFC3/UVIS detector with F814W provides the highest spatial resolution, with a fine plate scale of 0.04'' for optimal PSF sampling. The complementary F160W observations are critical because the NIR traces the bulk of the stellar mass, dominated by cooler stars in older populations, and is far less affected by dust extinction. Our exposure strategy is designed to maximize sensitivity to faint host galaxy features while avoiding saturation and limiting overheads. For F814W, the nucleus has an i-band PSF magnitude of ~17.0 (from gaia), but it's a Sy 2 so should be extended. To ensure an unsaturated measurement, we begin with a short 20 s exposure, followed by a 4-point dither pattern with 550 s exposures at each pointing. We employ the 40x 40'' UVIS2-C1K1C subarray to reduce readout and buffer-dump overheads, while the dither pattern improves PSF reconstruction and cosmic-ray rejection. For the F160W observations, the nucleus has a 2MASS H magnitude of 14.9 mag. To balance field of view and efficiency, we adopt the IRSUB512 aperture, providing a 60''x60'' FOV. We use the 4-point BOX dither pattern with long MULTIACCUM exposures (SPARS25 and STEP25 sequences, 14 or15 reads each) to achieve both deep sensitivity to faint extended emission and unsaturated short reads for the nucleus. Dr. Koss has significant experience working with Chandra/ACIS data and producing exciting scientific results with seven Chandra papers as first author and 52/176 as a coauthor. His Chandra research was also featured as a NASA press release, as a figure in the Chandra senior science review and in popular news outlets such as U.S. News & World Report, Popular Science, and MSNBC. He was featured in the March 2015 issue of Astronomy magazine discussing the advances Chandra has made studying dual AGN. He was recently one of 4 coauthors on AGN triality in mergers using exclusively Chandra data (Foord +21A,B). He is an expert on Compton-thick AGN, analysis of obscured AGN as well as X-ray analysis. He published the nature article (Koss+2018) where this sample was selected from and did the initial measurement in 167 BAT AGN (Koss+11). Most recently he published a 230 pc dual, the closest resolved with multiwavelength observations. He also used the SOAR goodman spectrograph and AEON queue as part of publishing 1486 spectra in the BASS dr2. Dr. Peca is an expert in Chandra data. Dr. Auge will assist in HST analysis as that is his expertise. Supermassive Black Holes and Active Galaxies Galaxies 6 false false false false false false true SECONDARY CHANDRA 27700348 false SUPPORTED GALAXY INTERACTING GALAXY NLR QUASAR SEYFERT YES Position based on WISE/Simbad. J2000 J2000 The scheduling data was generated by CASM 33.1. CASM was run in Phase I mode. WFC3/IR Imaging No No F160W The scheduling data was generated by CASM 33.1. CASM was run in Phase I mode. WFC3/UVIS Imaging No No F814W POS-TARG DITHER 1.716 LINE 1.095 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 3 false 1759411811866 The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. /private/var/folders/zf/_qv5k6q575l0jv5tgstkflj80000gn/T/OPVisit10550925158926615673.xml (Tic-Visit :proposal-id 18186 :visit-id "01" :proposal-version -1 :trans-version "20250624" :date "02-Oct-2025 15:30:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 652608 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18186 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18186 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2595 :al-overhead-at-end 81 :internal-dur-at-end 31 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2976 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18186 :visit-id "01" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2527 :al-overhead-at-end 0 :internal-dur-at-end 533 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2976 :pcs-gap 0 ) true 2 0