An effective selection method for low-mass active black holes and first spectroscopic identification

Tomoki Morokuma, Nozomu Tominaga, Masaomi Tanaka, Naoki Yasuda, Hisanori Furusawa, Yuki Taniguchi, Takahiro Kato, Ji An Jiang, Tohru Nagao, Hanindyo Kuncarayakti, Kana Morokuma-Matsui, Hiroyuki Ikeda, Sergei Blinnikov, Kenichi Nomoto, Mitsuru Kokubo, Mamoru Doi

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9 Citations (Scopus)


We present a newmethod for effectively selecting objects which may be low-mass active black holes (BHs) at galaxy centers using high-cadence optical imaging data, and our first spectroscopic identification of an active 2.7 106M BH at z = 0.164. This active BH was originally selected due to its rapid optical variability, from a few hours to a day, based on Subaru Hyper Suprime-Cam g-band imaging data taken with a 1 hr cadence. Broad and narrow H lines and many other emission ones are detected in our optical spectra taken with Subaru FOCAS, and the BH mass is measured via the broad H emission line width (1880kms1) and luminosity (4.2 1040 erg s1) after careful correction to the atmospheric absorption around 7580-7720 A° . We measure the Eddington ratio and find it to be as low as 0.05, considerably smaller than those in a previous SDSS sample with similar BH mass and redshift, which indicates one of the special potentials of our Subaru survey. The g r color and morphology of the extended component indicate that the host galaxy is a star-forming galaxy. We also show the effectiveness of our variability selection for low-mass active BHs.

Original languageEnglish
Article number40
JournalPublication of the Astronomical Society of Japan
Issue number3
Publication statusPublished - 2016 Jun 1


  • Active-galaxies
  • Galaxies
  • Nuclei-methods
  • Observational
  • Quasars
  • Supermassive black holes-surveys


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