论文标题
发现具有4个MAG变体的新的极端变化现象，SDSS J125809.31+351943.0
Discovery of a new extreme changing-state quasar with 4 mag variation, SDSS J125809.31+351943.0
论文作者
论文摘要
我们报告了类星体的发现，SDSS J125809.31+351943.0（J1258），它在1983年至2015年的4 MAG中亮了，这是迄今为止最大的类星体亮点事件之一。来自卡塔琳娜实时瞬态调查的光学光度数据数据的历史记录以及所有对超级Novae（ASAS-SN）的天空自动化调查，明智卫星的中红外光度计数据以及宽阔的排放线（BEL）通过Sloan Digital Sky的光谱获得了2003年和2015年的Sloan Digital Sumperivation spectrication the Pontoptric the Pontoptric the Pontoptric the coptric the coptrict coftrict the the coptrict the the coptrict coftrict in coft coftrict in cfht。目录包含1975年和1969年的数据，我们发现源比最近的ASAS-SN光度法的峰值之前是4个磁头。从这些数据的历史记录中，我们将J1258确定为新的更换状态的类星体（CSQ；或更换外观的类星体）。我们还使用Nishi-Harima天文天文台的2米望远镜在2018年12月和2019年5月进行了随访光谱观测。结果表明，连续通量和BEL通量降至其峰值的50％。这表明J1258正在为BEL通量和连续性通量造成两个变化状态。我们认为，J1258的可变性，尤其是其亮效事件，可以通过基于时间尺度和爱丁顿比率变化的加热前端和积聚磁盘状态过渡来解释。 J1258的黑洞的估计质量大约比到目前为止发现的CSQ大的数量级。由于变化的时间尺度和积聚磁盘的大小都取决于黑洞质量，因此J1258亮起事件可以解释为其他CSQ中变异性的缩放版本。这表明具有较大黑洞质量的远处类星体样品可能包含更长且变化较高的物体。
We report the discovery of a quasar, SDSS J125809.31+351943.0 (J1258), which brightened in optical for 4 mag from 1983 to 2015, which is one of the largest quasar brightening events so far. The history of optical photometry data of this quasar from the Catalina Real-time Transient Survey and All Sky Automated Survey for Super Novae (ASAS-SN), mid-infrared photometry data from the WISE satellite, and the broad emission line (BEL) flux obtained by spectroscopy of Sloan Digital Sky Survey shows their significant increases between 2003 and 2015. Investigating its CFHT photometric observations in 1983 and the USNO-B catalog, which contains data in 1975 and 1969, we found that the source was 4 mag fainter before than the peak of the recent ASAS-SN photometry. From the history of these data, we identified J1258 as a new Changing-State Quasar (CSQ; or Changing-Look Quasar). We also performed follow-up spectroscopic observations in December 2018 and May 2019, using the 2-meter telescope in Nishi-Harima Astronomical Observatory. The results show that the continuum flux and the BEL flux decreased to about 50 % of its peak. This indicates that J1258 is causing two changing-states for the BEL flux and continuum flux. We argue that J1258's variability, especially its brightening event, can be explained by the propagation of the heating front and the accretion disk state transitions based on the timescale and Eddington ratio variations. The estimated mass of the black hole of J1258 is about an order of magnitude larger than the CSQs found so far. Since both the changing timescale and the size of the accretion disk depend on the black hole mass, the J1258 brightening event can be interpreted as a scaled version of the variability in other CSQs. This suggests that samples of distant quasars with larger black hole masses may contain objects with longer and severer variations.
