0 Assigned ID: 587 ----- Attempting Submission 1 (Fri Apr 08 16:44:42 GMT 2016) ----- Resubmission form CS I. Momcheva. The following changes were made to the original submission: - Changed IR apertures form "IR-FIX" to "IR" - Changed the read-out sequences to increase the number of samples - Introduced ORIENT constraints to to visits 01 and 02 to avoid the diffration spikes of stars -1267456159 ----- Attempting Submission 1 (Thu Jul 21 12:12:31 GMT 2016) ----- ----- Attempting Submission 2 (Fri Oct 28 21:07:53 GMT 2016) ----- Hearts of Darkness: Compact Obscured Nuclei in S0/a Galaxies Recent high angular resolution millimeter observations have revealed extrordinary features in the centers of nearby S0/a galaxies. These nuclei are compact (< 100 pc) and heavily obscured by ~1E7-1E8 Msun of dense, dusty gas at levels that challenge ALMA. The three archetypal compact obscured nuclei (CONs) that we are targeting for HST UVOIR imaging are luminous FIR sources without obvious starbursts which suggests that the CONs are associated with AGN in a previously unrecognized type of SMBH growth phase. Our molecular line observations detect substantial molecular inflows and outflows from our targeted CONs, including a highly collimated molecular jet in NGC 1377; these systems are in dynamic states with significant momentum transfers within their gas. Because of the challenges associated with directly observing CONs even at millimeter wavelengths, these objects are best studied through their effects on the surrounding environment. Thus, we propose to obtain WFC3 HST imaging in the UVOIR to extend our understanding of the relationship between CONs and their host systems. The primary objectives of this HST project include measuring dust absorption to map the 3D structure of the ISM out to kiloparsec scales and to thereby constrain the mechanisms responsible for the dynamic behavior of the gas. The unique resolution and wavelength coverage of WFC3 images also will allow us to explore dust-to-gas ratios and CO-H2 conversion factors, assess the levels of recent star formation and seek evidence of past galaxy interactions which might produce CONs in otherwise quiescent galaxies. Our goal is to obtain multi-wavelength images of 3 galaxies hosting compact nuclei that are heavily obscured by dust. The small scale structure of the interstellar media in the central regions is being explored, primarily through a combination of Atacama Large Millimeter Array (ALMA) and Sub-Miilimeter Array (SMA) moecular line observations. These have few-to-sub-arcsecond angular resolution and excellent astrometric calibrations. A prime objective is to compare dust features with the millimeter maps. The dust can provid einformation on the spatial distribution of the dense gas through analysis of optical depths and foreground brightness levels that require a substantial wavelength baseline, while the millimeter data track gas column densities, temperatures, and kinematics. We therefore require careful placement of the WFC3/UVIS aperture to avoid areas with lower image quality, and will seek the best possible astrometric solutions for the comparison with the millimeter maps. A second objective involves connections between the nuclei and kpc-scale thin dust lanes observed in ground-based optical images. These extend typically 30-40 arcseconds in radius and thus we can center ona single WFC3 CCD and not worry about specifying an orient. The 3rd objective is to study the spectral energy distribution of the host galaxy (spectra indicate central regions have post-starburst properties) through color maps. These will need to be convolved with reasonable PSFs to allow us to compare across the angular resolution difference of a factor of ~4 between the F336W and F160W observations. In addition we will search for intermediate age star clusters that could be remnants of a past starburst through SED fits to surrounding sources identified by angular size and color. Massive Black Holes and their Hosts Galaxies 12 false false false false false false SUPPORTED GALAXY LENTICULAR NUCLEUS WIND YES This object was generated by the target selector and retrieved from the SIMBAD database. J2000 J2000 GALAXY LENTICULAR This object was generated by the targetselector and retrieved from the SIMBAD database. NGC-4418 J2000 J2000 GALAXY LENTICULAR This object was generated by the targetselector and retrieved from the NED database. 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