Discovery of dramatic optical variability in SDSS J1100+4421: A peculiar radio-loud narrow-line Seyfert 1 galaxy?

Masaomi Tanaka; Tomoki Morokuma; Ryosuke Itoh; Hiroshi Akitaya; Nozomu Tominaga; Yoshihiko Saito; Łukasz Stawarz; Yasuyuki T. Tanaka; Poshak Gandhi; Gamal Ali; Tsutomu Aoki; Carlos Contreras; Mamoru Doi; Ahmad Essam; Gamal Hamed; Eric Y. Hsiao; Ikuru Iwata; Koji S. Kawabata; Nobuyuki Kawai; Yuki Kikuchi; Naoto Kobayashi; Daisuke Kuroda; Hiroyuki Maehara; Emiko Matsumoto; Paolo A. Mazzali; Takeo Minezaki; Hiroyuki Mito; Takashi Miyata; Satoshi Miyazaki; Kensho Mori; Yuki Moritani; Kana Morokuma-Matsui; Nidia Morrell; Tohru Nagao; Yoshikazu Nakada; Fumiaki Nakata; Chinami Noma; Ken Ohsuga; Norio Okada; Mark M. Phillips; Elena Pian; Michael W. Richmond; Devendra Sahu; Shigeyuki Sako; Yuki Sarugaku; Takumi Shibata; Takao Soyano; Maximilian D. Stritzinger; Yutaro Tachibana; Francesco Taddia; Katsutoshi Takaki; Ali Takey; Ken'Ichi Tarusawa; Takahiro Ui; Nobuharu Ukita; Yuji Urata; Emma S. Walker; Taketoshi Yoshii

doi:10.1088/2041-8205/793/2/L26

Discovery of dramatic optical variability in SDSS J1100+4421: A peculiar radio-loud narrow-line Seyfert 1 galaxy?

Masaomi Tanaka, Tomoki Morokuma, Ryosuke Itoh, Hiroshi Akitaya, Nozomu Tominaga, Yoshihiko Saito, Łukasz Stawarz, Yasuyuki T. Tanaka, Poshak Gandhi, Gamal Ali, Tsutomu Aoki, Carlos Contreras, Mamoru Doi, Ahmad Essam, Gamal Hamed, Eric Y. Hsiao, Ikuru Iwata, Koji S. Kawabata, Nobuyuki Kawai, Yuki KikuchiNaoto Kobayashi, Daisuke Kuroda, Hiroyuki Maehara, Emiko Matsumoto, Paolo A. Mazzali, Takeo Minezaki, Hiroyuki Mito, Takashi Miyata, Satoshi Miyazaki, Kensho Mori, Yuki Moritani, Kana Morokuma-Matsui, Nidia Morrell, Tohru Nagao, Yoshikazu Nakada, Fumiaki Nakata, Chinami Noma, Ken Ohsuga, Norio Okada, Mark M. Phillips, Elena Pian, Michael W. Richmond, Devendra Sahu, Shigeyuki Sako, Yuki Sarugaku, Takumi Shibata, Takao Soyano, Maximilian D. Stritzinger, Yutaro Tachibana, Francesco Taddia, Katsutoshi Takaki, Ali Takey, Ken'Ichi Tarusawa, Takahiro Ui, Nobuharu Ukita, Yuji Urata, Emma S. Walker, Taketoshi Yoshii

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey. The source brightened in the optical by at least a factor of three within about half a day. Spectroscopic observations suggest that this object is likely a narrow-line Seyfert 1 galaxy (NLS1) at z = 0.840, however, with unusually strong narrow emission lines. The estimated black hole mass of 10⁷M implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R ≃ 4 × 10²-3 × 10³, which implies the presence of relativistic jets. Rapid and large-amplitude optical variability of the target, reminiscent of that found in a few radio- and γ-ray-loud NLS1s, is therefore produced most likely in a blazar-like core. The 1.4 GHz radio image of the source shows an extended structure with a linear size of about 100 kpc. If SDSS J1100+4421 is a genuine NLS1, as suggested here, this radio structure would then be the largest ever discovered in this type of active galaxies.

Original language	English
Article number	L26
Journal	Astrophysical Journal Letters
Volume	793
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/793/2/L26
Publication status	Published - 2014 Oct 1

Keywords

galaxies: active
galaxies: individual (SDSS J110006.07+442144.3)
galaxies: jets
galaxies: Seyfert

Access to Document

10.1088/2041-8205/793/2/L26

Cite this

Tanaka, M., Morokuma, T., Itoh, R., Akitaya, H., Tominaga, N., Saito, Y., Stawarz, Ł., Tanaka, Y. T., Gandhi, P., Ali, G., Aoki, T., Contreras, C., Doi, M., Essam, A., Hamed, G., Hsiao, E. Y., Iwata, I., Kawabata, K. S., Kawai, N., ... Yoshii, T. (2014). Discovery of dramatic optical variability in SDSS J1100+4421: A peculiar radio-loud narrow-line Seyfert 1 galaxy? Astrophysical Journal Letters, 793(2), Article L26. https://doi.org/10.1088/2041-8205/793/2/L26

@article{da1d7d4297d44a2e81e97c15432916e1,

title = "Discovery of dramatic optical variability in SDSS J1100+4421: A peculiar radio-loud narrow-line Seyfert 1 galaxy?",

abstract = "We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey. The source brightened in the optical by at least a factor of three within about half a day. Spectroscopic observations suggest that this object is likely a narrow-line Seyfert 1 galaxy (NLS1) at z = 0.840, however, with unusually strong narrow emission lines. The estimated black hole mass of 107M implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R ≃ 4 × 102-3 × 103, which implies the presence of relativistic jets. Rapid and large-amplitude optical variability of the target, reminiscent of that found in a few radio- and γ-ray-loud NLS1s, is therefore produced most likely in a blazar-like core. The 1.4 GHz radio image of the source shows an extended structure with a linear size of about 100 kpc. If SDSS J1100+4421 is a genuine NLS1, as suggested here, this radio structure would then be the largest ever discovered in this type of active galaxies.",

keywords = "galaxies: active, galaxies: individual (SDSS J110006.07+442144.3), galaxies: jets, galaxies: Seyfert",

author = "Masaomi Tanaka and Tomoki Morokuma and Ryosuke Itoh and Hiroshi Akitaya and Nozomu Tominaga and Yoshihiko Saito and {\L}ukasz Stawarz and Tanaka, {Yasuyuki T.} and Poshak Gandhi and Gamal Ali and Tsutomu Aoki and Carlos Contreras and Mamoru Doi and Ahmad Essam and Gamal Hamed and Hsiao, {Eric Y.} and Ikuru Iwata and Kawabata, {Koji S.} and Nobuyuki Kawai and Yuki Kikuchi and Naoto Kobayashi and Daisuke Kuroda and Hiroyuki Maehara and Emiko Matsumoto and Mazzali, {Paolo A.} and Takeo Minezaki and Hiroyuki Mito and Takashi Miyata and Satoshi Miyazaki and Kensho Mori and Yuki Moritani and Kana Morokuma-Matsui and Nidia Morrell and Tohru Nagao and Yoshikazu Nakada and Fumiaki Nakata and Chinami Noma and Ken Ohsuga and Norio Okada and Phillips, {Mark M.} and Elena Pian and Richmond, {Michael W.} and Devendra Sahu and Shigeyuki Sako and Yuki Sarugaku and Takumi Shibata and Takao Soyano and Stritzinger, {Maximilian D.} and Yutaro Tachibana and Francesco Taddia and Katsutoshi Takaki and Ali Takey and Ken'Ichi Tarusawa and Takahiro Ui and Nobuharu Ukita and Yuji Urata and Walker, {Emma S.} and Taketoshi Yoshii",

year = "2014",

month = oct,

day = "1",

doi = "10.1088/2041-8205/793/2/L26",

language = "English",

volume = "793",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "2",

}

Tanaka, M, Morokuma, T, Itoh, R, Akitaya, H, Tominaga, N, Saito, Y, Stawarz, Ł, Tanaka, YT, Gandhi, P, Ali, G, Aoki, T, Contreras, C, Doi, M, Essam, A, Hamed, G, Hsiao, EY, Iwata, I, Kawabata, KS, Kawai, N, Kikuchi, Y, Kobayashi, N, Kuroda, D, Maehara, H, Matsumoto, E, Mazzali, PA, Minezaki, T, Mito, H, Miyata, T, Miyazaki, S, Mori, K, Moritani, Y, Morokuma-Matsui, K, Morrell, N, Nagao, T, Nakada, Y, Nakata, F, Noma, C, Ohsuga, K, Okada, N, Phillips, MM, Pian, E, Richmond, MW, Sahu, D, Sako, S, Sarugaku, Y, Shibata, T, Soyano, T, Stritzinger, MD, Tachibana, Y, Taddia, F, Takaki, K, Takey, A, Tarusawa, KI, Ui, T, Ukita, N, Urata, Y, Walker, ES & Yoshii, T 2014, 'Discovery of dramatic optical variability in SDSS J1100+4421: A peculiar radio-loud narrow-line Seyfert 1 galaxy?', Astrophysical Journal Letters, vol. 793, no. 2, L26. https://doi.org/10.1088/2041-8205/793/2/L26

TY - JOUR

T1 - Discovery of dramatic optical variability in SDSS J1100+4421

T2 - A peculiar radio-loud narrow-line Seyfert 1 galaxy?

AU - Tanaka, Masaomi

AU - Morokuma, Tomoki

AU - Itoh, Ryosuke

AU - Akitaya, Hiroshi

AU - Tominaga, Nozomu

AU - Saito, Yoshihiko

AU - Stawarz, Łukasz

AU - Tanaka, Yasuyuki T.

AU - Gandhi, Poshak

AU - Ali, Gamal

AU - Aoki, Tsutomu

AU - Contreras, Carlos

AU - Doi, Mamoru

AU - Essam, Ahmad

AU - Hamed, Gamal

AU - Hsiao, Eric Y.

AU - Iwata, Ikuru

AU - Kawabata, Koji S.

AU - Kawai, Nobuyuki

AU - Kikuchi, Yuki

AU - Kobayashi, Naoto

AU - Kuroda, Daisuke

AU - Maehara, Hiroyuki

AU - Matsumoto, Emiko

AU - Mazzali, Paolo A.

AU - Minezaki, Takeo

AU - Mito, Hiroyuki

AU - Miyata, Takashi

AU - Miyazaki, Satoshi

AU - Mori, Kensho

AU - Moritani, Yuki

AU - Morokuma-Matsui, Kana

AU - Morrell, Nidia

AU - Nagao, Tohru

AU - Nakada, Yoshikazu

AU - Nakata, Fumiaki

AU - Noma, Chinami

AU - Ohsuga, Ken

AU - Okada, Norio

AU - Phillips, Mark M.

AU - Pian, Elena

AU - Richmond, Michael W.

AU - Sahu, Devendra

AU - Sako, Shigeyuki

AU - Sarugaku, Yuki

AU - Shibata, Takumi

AU - Soyano, Takao

AU - Stritzinger, Maximilian D.

AU - Tachibana, Yutaro

AU - Taddia, Francesco

AU - Takaki, Katsutoshi

AU - Takey, Ali

AU - Tarusawa, Ken'Ichi

AU - Ui, Takahiro

AU - Ukita, Nobuharu

AU - Urata, Yuji

AU - Walker, Emma S.

AU - Yoshii, Taketoshi

PY - 2014/10/1

Y1 - 2014/10/1

N2 - We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey. The source brightened in the optical by at least a factor of three within about half a day. Spectroscopic observations suggest that this object is likely a narrow-line Seyfert 1 galaxy (NLS1) at z = 0.840, however, with unusually strong narrow emission lines. The estimated black hole mass of 107M implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R ≃ 4 × 102-3 × 103, which implies the presence of relativistic jets. Rapid and large-amplitude optical variability of the target, reminiscent of that found in a few radio- and γ-ray-loud NLS1s, is therefore produced most likely in a blazar-like core. The 1.4 GHz radio image of the source shows an extended structure with a linear size of about 100 kpc. If SDSS J1100+4421 is a genuine NLS1, as suggested here, this radio structure would then be the largest ever discovered in this type of active galaxies.

AB - We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey. The source brightened in the optical by at least a factor of three within about half a day. Spectroscopic observations suggest that this object is likely a narrow-line Seyfert 1 galaxy (NLS1) at z = 0.840, however, with unusually strong narrow emission lines. The estimated black hole mass of 107M implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R ≃ 4 × 102-3 × 103, which implies the presence of relativistic jets. Rapid and large-amplitude optical variability of the target, reminiscent of that found in a few radio- and γ-ray-loud NLS1s, is therefore produced most likely in a blazar-like core. The 1.4 GHz radio image of the source shows an extended structure with a linear size of about 100 kpc. If SDSS J1100+4421 is a genuine NLS1, as suggested here, this radio structure would then be the largest ever discovered in this type of active galaxies.

KW - galaxies: active

KW - galaxies: individual (SDSS J110006.07+442144.3)

KW - galaxies: jets

KW - galaxies: Seyfert

UR - http://www.scopus.com/inward/record.url?scp=84907208240&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84907208240&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/793/2/L26

DO - 10.1088/2041-8205/793/2/L26

M3 - Article

AN - SCOPUS:84907208240

SN - 2041-8205

VL - 793

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L26

ER -

Discovery of dramatic optical variability in SDSS J1100+4421: A peculiar radio-loud narrow-line Seyfert 1 galaxy?

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this