0 Assigned ID: 673 ----- Attempting Submission 1 (Fri Apr 08 18:40:16 GMT 2016) ----- HST Phase I Proposal 673 (hst_ar24.apt) successfully submitted. Receipt: # 673-1 ----- Attempting Submission 2 (Fri Apr 08 18:45:10 GMT 2016) ----- HST Phase I Proposal 673 (hst_ar24.apt) successfully submitted. Receipt: # 673-2 ----- Attempting Submission 3 (Fri Apr 08 23:06:53 GMT 2016) ----- HST Phase I Proposal 673 (hst_ar24.apt) successfully submitted. Receipt: # 673-3 ----- Attempting Submission 4 (Fri Apr 08 23:34:38 GMT 2016) ----- We propose to perform a homogeneous isophotal analysis of all suitable imaging data in the HST Archive for early-type galaxies (ETGs) in the MASSIVE and eMASSIVE samples. MASSIVE is a volume-limited and stellar-mass-selected survey of the structure and dynamics of the 116 most massive ETGs in the northern sky within 108 Mpc. MASSIVE is designed to address a wide range of outstanding problems in ETG formation, including the connection between supermassive black hole (BH) and galaxy growths, the variation in dark matter fraction and stellar IMF within and among ETGs, and the late-time assembly of galaxy outskirts. We have already obtained much of the needed IFS and wide-field imaging for this project; here we propose to add the one missing ingredient - high resolution imaging with HST - to nail down the central profiles. In addition, we will leverage the HST Archive and analyze all available imaging data for eMASSIVE, an extension of MASSIVE to the whole sky and 150 Mpc. We expect a high fraction of the proposed sample of 99 massive ETGs with archival HST data to have flattened central light profiles. We will perform 1-D and 2-D isophotal analysis to measure the core size, radial profile and morphology of each galaxy. We will use the core size and two tight scaling relations to estimate BH mass and sphere of influence, and examine trends in core size, BH mass, and BH-to-bulge mass ratio with galaxy environment. This large sample of ETG imaging data for a well-defined galaxy survey will provide the most comprehensive census of nuclear structure, core size and black hole mass for the most massive galaxies in the local universe. Massive Black Holes and their Hosts 0 Regular false false false SUPPORTED