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DISCOVERY OF DRAMATIC OPTICAL VARIABILITY IN SDSS J1100+4421: A PECULIAR RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXY?

Tanaka, M, Morokuma, T, Itoh, R, Akitaya, H, Tominaga, N, Saito, Y, Stawarz, L, 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, K, Ui, T, Ukita, N, Urata, Y, Walker, ES and 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). pp. 1-6. ISSN 2041-8205

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Abstract

We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey (KISS). 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 ~ 10^7 Msun 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 x 10^2 - 3 x 10^3, 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 gamma-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

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: IOP PUBLISHING LTD
Related URLs:
Date Deposited: 08 Feb 2016 11:54
Last Modified: 09 Sep 2017 05:33
DOI or Identification number: 10.1088/2041-8205/793/2/L26
URI: http://researchonline.ljmu.ac.uk/id/eprint/2863

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