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

doi:10.1093/pasj/psw033

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

SCI - Astronomy

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

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 language	English
Article number	40
Journal	Publications of the Astronomical Society of Japan
Volume	68
Issue number	3
DOIs	https://doi.org/10.1093/pasj/psw033
Publication status	Published - 2016

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Morokuma, T., Tominaga, N., Tanaka, M., Yasuda, N., Furusawa, H., Taniguchi, Y., Kato, T., Jiang, J. A., Nagao, T., Kuncarayakti, H., Morokuma-Matsui, K., Ikeda, H., Blinnikov, S., Nomoto, K., Kokubo, M., & Doi, M. (2016). An effective selection method for low-mass active black holes and first spectroscopic identification. Publications of the Astronomical Society of Japan, 68(3), [40]. https://doi.org/10.1093/pasj/psw033

An effective selection method for low-mass active black holes and first spectroscopic identification. / Morokuma, Tomoki; Tominaga, Nozomu; Tanaka, Masaomi; Yasuda, Naoki; Furusawa, Hisanori; Taniguchi, Yuki; Kato, Takahiro; Jiang, Ji An; Nagao, Tohru; Kuncarayakti, Hanindyo; Morokuma-Matsui, Kana; Ikeda, Hiroyuki; Blinnikov, Sergei; Nomoto, Kenichi; Kokubo, Mitsuru; Doi, Mamoru.

In: Publications of the Astronomical Society of Japan, Vol. 68, No. 3, 40, 2016.

Research output: Contribution to journal › Article

Morokuma, T, Tominaga, N, Tanaka, M, Yasuda, N, Furusawa, H, Taniguchi, Y, Kato, T, Jiang, JA, Nagao, T, Kuncarayakti, H, Morokuma-Matsui, K, Ikeda, H, Blinnikov, S, Nomoto, K, Kokubo, M & Doi, M 2016, 'An effective selection method for low-mass active black holes and first spectroscopic identification', Publications of the Astronomical Society of Japan, vol. 68, no. 3, 40. https://doi.org/10.1093/pasj/psw033

Morokuma, Tomoki ; Tominaga, Nozomu ; Tanaka, Masaomi ; Yasuda, Naoki ; Furusawa, Hisanori ; Taniguchi, Yuki ; Kato, Takahiro ; Jiang, Ji An ; Nagao, Tohru ; Kuncarayakti, Hanindyo ; Morokuma-Matsui, Kana ; Ikeda, Hiroyuki ; Blinnikov, Sergei ; Nomoto, Kenichi ; Kokubo, Mitsuru ; Doi, Mamoru. / An effective selection method for low-mass active black holes and first spectroscopic identification. In: Publications of the Astronomical Society of Japan. 2016 ; Vol. 68, No. 3.

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abstract = "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.",

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AU - Tominaga, Nozomu

AU - Tanaka, Masaomi

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AU - Furusawa, Hisanori

AU - Taniguchi, Yuki

AU - Kato, Takahiro

AU - Jiang, Ji An

AU - Nagao, Tohru

AU - Kuncarayakti, Hanindyo

AU - Morokuma-Matsui, Kana

AU - Ikeda, Hiroyuki

AU - Blinnikov, Sergei

AU - Nomoto, Kenichi

AU - Kokubo, Mitsuru

AU - Doi, Mamoru

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AB - 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.

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