The Close AGN Reference Survey (CARS): Mrk 1018 halts dimming and experiences strong short-term variability
The Close AGN Reference Survey (CARS): Mrk 1018 halts dimming and experiences strong short-term variability
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DOI：
10.1051/0004-6361/201731967
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发表时间：
2017-10
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影响因子：
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通讯作者：
M. Krumpe;B. Husemann;G. Tremblay;G. Tremblay;T. Urrutia;M. Powell;T. Davis;J. Scharwächter;J. Dexter;G. Busch;F. Combes;S. Croom;A. Eckart;A. Eckart;R. McElroy;M. Pérez-Torres;G. Leung
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作者：
M. Krumpe;B. Husemann;G. Tremblay;G. Tremblay;T. Urrutia;M. Powell;T. Davis;J. Scharwächter;J. Dexter;G. Busch;F. Combes;S. Croom;A. Eckart;A. Eckart;R. McElroy;M. Pérez-Torres;G. Leung
在1984年将活动星系核的光学型从1.9改变为1之后，活动星系核Mrk 1018最近又恢复到了1.9型。我们正在进行的监测显示，活动星系核已经停止了急剧的变暗，在2016年10月左右达到最低点。最低值之后是爆发上升与$\sim$0.25 U波段mag/月。重新变亮至少持续到2017年2月，钱德拉和哈勃的联合观测证实了这一点。2017年7月，在放射源从防晒霜中出现后，监测恢复，此时AGN被发现仅比其最小值亮0.4等。间歇性爆发伴随着宽线形状的红翼不对称的出现，表明宽线区域不均匀。Mrk 1018在快速衰减后，目前闪烁的亮度要么表明它已经重新点燃，要么在低水平上保持可变，要么可能在未来几年内继续变暗。区分这些可能性需要连续的多波长监测。
After changing optical AGN type from 1.9 to 1 in 1984, the AGN Mrk 1018 recently reverted back to its type 1.9 state. Our ongoing monitoring now reveals that the AGN has halted its dramatic dimming, reaching a minimum around October 2016. The minimum was followed by an outburst rising with $\sim$0.25 U-band mag/month. The rebrightening lasted at least until February 2017, as confirmed by joint Chandra and Hubble observations. Monitoring was resumed in July 2017 after the source emerged from sunblock, at which point the AGN was found only $\sim$0.4 mag brighter than its minimum. The intermittent outburst was accompanied by the appearance of a red wing asymmetry in broad-line shape, indicative of an inhomogeneous broad-line region. The current flickering brightness of Mrk 1018 following its rapid fading either suggests that the source has reignited, remains variable at a low level, or may continue dimming over the next few years. Distinguishing between these possibilities requires continuous multiwavelength monitoring.