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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 et al (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 of acceptance: | 5 September 2014 |
| Date of first compliant Open Access: | 8 February 2016 |
| Date Deposited: | 08 Feb 2016 11:54 |
| Last Modified: | 04 Sep 2021 13:29 |
| DOI or ID number: | 10.1088/2041-8205/793/2/L26 |
| URI: | https://ljmu-9.eprints-hosting.org/id/eprint/2863 |
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