2014ApJ...793L..26T

Query : 2014ApJ...793L..26T

2014ApJ...793L..26T - Astrophys. J., 793, L26 (2014/October-1)

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 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., KIKUCHI Y., KOBAYASHI N., KURODA D., MAEHARA H., MATSUMOTO E., MAZZALI P.A., 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 M.M., PIAN E., RICHMOND M.W., SAHU D., SAKO S., SARUGAKU Y., SHIBATA T., SOYANO T., STRITZINGER M.D., TACHIBANA Y., TADDIA F., TAKAKI K., TAKEY A., TARUSAWA K., UI T., UKITA N., URATA Y., WALKER E.S. and YOSHII T.

Abstract (from CDS):

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 ∼107 M☉ implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R ≃ 4x102-3x103, 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.

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Journal keyword(s): galaxies: active - galaxies: individual: SDSS J110006.07+442144.3 - galaxies: jets - galaxies: Seyfert

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO J0948+0022 Bla 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 350 2
2 7C 105714.80+443757.00 Sy1 11 00 06.0561234408 +44 21 44.397129168           ~ 8 1
3 QSO B2004-447 Bla 20 07 55.1842447944 -44 34 44.274118260   19.3 19.3 18   ~ 185 1

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