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Tanaka, M and Morokuma, T and Itoh, R and Akitaya, H and Tominaga, N and Saito, Y and Stawarz, L and Tanaka, YT and Gandhi, P and Ali, G and Aoki, T and Contreras, C and Doi, M and Essam, A and Hamed, G and Hsiao, EY and Iwata, I and Kawabata, KS and Kawai, N and Kikuchi, Y and Kobayashi, N and Kuroda, D and Maehara, H and Matsumoto, E and Mazzali, PA and Minezaki, T and Mito, H and Miyata, T and Miyazaki, S and Mori, K and Moritani, Y and Morokuma-Matsui, K and Morrell, N and Nagao, T and Nakada, Y and Nakata, F and Noma, C and Ohsuga, K and Okada, N and Phillips, MM and Pian, E and Richmond, MW and Sahu, D and Sako, S and Sarugaku, Y and Shibata, T and Soyano, T and Stritzinger, MD and Tachibana, Y and Taddia, F and Takaki, K and Takey, A and Tarusawa, K and Ui, T and Ukita, N and Urata, Y and 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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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
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Date Deposited: 08 Feb 2016 11:54
Last Modified: 08 Feb 2016 11:54
DOI or Identification number: 10.1088/2041-8205/793/2/L26
URI: http://researchonline.ljmu.ac.uk/id/eprint/2863

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