Hidden Binary Supermassive Black Holes Revealed by 'Radio-Near IR' Imaging

Scientific Category is a required field. Science Keywords: Select from 2 to 5 items. 0 Assigned ID: 1308 ----- Attempting Submission 1 (Tue Dec 29 14:42:14 GMT 2020) ----- joint I appreciate the kind help from phase 2 support contact and program contact scientist. Overall it was not much difficult to make phase 2, but combining pattern and visits were not very intuitive. 180543482 ----- Attempting Submission 1 (Tue Feb 02 20:03:44 GMT 2021) ----- Hidden Binary Supermassive Black Holes Revealed by 'Radio-Near IR' Imaging Nearly all galaxies harbor supermassive black holes and galaxy mergers are common in hierarchical galaxy formation. Therefore, the study of dual (~1kpc separation) or binary (~1pc separation) supermassive black hole (SMBH) is very important to understand the co-evolution of SMBH and its host galaxy. However, the number of confirmed dual or binary AGNs is small because most of the follow-up observations of the dual or binary SMBH candidates rely on a single observing band and therefore have a low success rate when one of the two (or both) AGNs is not visible in the chosen band. Based on the recent discovery of the radio-optical dual AGN demonstrating the importance of the multiband confirmation, we propose a pilot study of dual/binary AGN search using both highresolution radio and NIR images from VLBA and HST in order not to miss AGN that is visible only in either one of the observing bands. This program will provide high-resolution radio and NIR images to measure the separation of the two AGNs with the estimate of the galaxy stellar mass and black hole mass, and will demonstrate the power of using VLBA and HST(JWST in future) for a large scale systematic search for binary SMBHs. We propose using HST/WFC3 F160W (H band). The 2MASS H band integrated magnitude for the targets are 14.49 and 14.14 mag. We find the optimal exposure sequence that has a mixture of short and long exposure to avoid a saturation at the center of galaxies and obtain a reliable nuclear morphology, while we sample the host galaxy morphology beyond half-light radius with surface brightness of 21.5 mag/arcsec^2 in F160W, using exposure time calculator. We will use the standard 4-point dithering for each visit and find that 1 orbit for each target will be sufficient for on source exposure with 2 repeats of the dither pattern. n/a 6 false false false false false false false SUPPORTED GALAXY MULTIPLE NUCLEI J2000 J2000 GALAXY MULTIPLE NUCLEI J2000 J2000 WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1

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