论文标题
Seyfert星系和更换外观AGN-II的Skymapper颜色。新发现的更换外观AGN
SkyMapper colours of Seyfert galaxies and Changing-look AGN-II. Newly discovered Changing-look AGN
论文作者
论文摘要
更换活跃的银河系核（clagn）是AGN，随着其宽发射线的出现或消失，它通常会伴随着强烈的通量变化。我们通过从光谱6DF Galaxy调查中选择2型AGN来搜索锁骨，该调查的光度法与Skymapper Southern Survey在十年后观察到的光度法与1型AGN一致。从235个已知2型AGN的随机样品开始，我们选择18个候选物，并确认13个AGN已更改为1型光谱。对不完整样本的观察结果表明，九个转交锁。尽管我们的搜索并非旨在可靠地发现关闭的策略，但我们也发现了四种情况。该结果表明，在〜15年内，锁骨率为12％，这意味着在此期间的总锁骨率为约25％。最后，我们提出了对锁骨现象学非典型的AGN的观察结果，其中包括J1109146-一种在6DFGS中没有出现为AGN的锁骨； J1406507-第二个报告的更改LookNLS1；和J1340153-一个变化时间为三个月的策略。
Changing-look Active Galactic Nuclei (CLAGN) are AGN that change type as their broad emission lines appear or disappear, which is usually accompanied by strong flux changes inn their blue featureless continuum. We search for Turn-On CLAGN by selecting type-2 AGN from the spectroscopic 6dF Galaxy Survey, whose photometry, as observed over a decade later by the SkyMapper Southern Survey, is consistent with type-1 AGN. Starting from a random sample of 235 known type-2 AGN we select 18 candidates and confirm 13 AGN to have changed into type-1 spectra; observations of an incomplete sample reveal nine further Turn-On CLAGN. While our search was not intended to reliably discover Turn-Off CLAGN, we discover four such cases as well. This result suggests a Turn-On CLAGN rate of 12% over ~15 years and imply a total CLAGN rate of ~25% over this period. Finally, we present observations of AGN that are atypical for the CLAGN phenomenology, including J1109146 - a CLAGN that did not appear as an AGN in 6dFGS; J1406507 - the second reported Changinglook NLS1; and J1340153 - a CLAGN with a change timescale of three months.
