Discovery of Dramatic Optical Variability in SDSS J1100+4421: A Peculiar Radio-loud Narrow-line Seyfert 1 Galaxy?
Discovery of Dramatic Optical Variability in SDSS J1100+4421: A Peculiar Radio-loud Narrow-line Seyfert 1 Galaxy?
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在 SDSS J1100 4421 中发现了巨大的光学变率：一个奇特的无线电响亮的窄线 Seyfert 1 星系？
DOI：
10.1088/2041-8205/793/2/l26
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Y. et al.
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文献类型：
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作者：
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. et al.
我们通过高阶瞬变探测Kiso超新星探测发现了SDSS J1100+4421中的剧烈变化。在大约半天的时间里，光源在光学上变亮了至少三倍。光谱观测表明，这个天体很可能是一个z=0.840的窄线塞弗特1星系(Nls1)，具有异常强的窄发射线。∼107M☉的估计黑洞质量意味着测辐射核光度接近爱丁顿极限。SDSSJ1100+442 1也具有极强的射电响度，其射电响度参数R≃为4×10 2-3×10 3，表明存在相对论喷流。因此，目标的快速和大幅度光学可变性很可能是在类似blazar的核心中产生的，这让人想起在少数射电和γ射线发出的NLS1中发现的变化。震源的1.4 GHz射电图像显示了一个线性大小约为100kpc的扩展结构。如果SDSS J1100+4421是一个真正的NLS1，那么这个射电结构将是在这类活动星系中发现的最大的射电结构。
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∼ 10 7 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≃ 4× 10 2–3× 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 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.