Program: GS-2018B-Q-224

Title:Spectroscopic Characterization of Tidal Disruption Events and Host Galaxies
PI:Tomoki Morokuma
Co-I(s): Tohru Nagao, Nozomu Tominaga, Masaki Yamaguchi, Masaomi Tanaka, Kenichi Nomoto, Takashi Moriya, Kazuma Mitsuda, Toshihiro Kawaguchi, Chien-Hsiu Lee, Naoki Yasuda, Kojiro Kawana, Keiichi Maeda, Yoshiki Matsuoka, Nao Suzuki

Abstract

We propose 2-night Standard Target-Of-Opportunity (SToO) optical spectroscopic and imaging follow-up observations with Gemini-N/GMOS to (i) spectroscopically identify tidal disruption event (TDE) candidates found in our coming (approved) Subaru/HSC transient survey in the SXDS field, (ii) investigate the host galaxy properties, and (iii) study black hole-host galaxy relations in the low-mass regime at high redshifts (0.2<z<1.0). TDEs, in general, are preferably hosted by lower-mass black holes (BHs, ~10^6 Msun) and a useful tool to study BH-host galaxy relation without being affected by luminous AGN. Our selection criteria were well established and a convincing candidate was found in our 2016-2017 HSC transient survey in the COSMOS field. Our coming HSC transient survey in the SXDS field, which will be the final systematic transient survey within the HSC-SSP, will be done in the S18B semester and a few TDEs are expected to be discovered.