An [O iii] search for extended emission around AGN with H i mapping: a distant cloud ionized by Mkn 1

An [O iii] search for extended emission around AGN with H i mapping: a distant cloud ionized by Mkn 1
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[O-iii] 使用 H-i 映射搜索 AGN 周围的扩展发射:由 Mkn 1 电离的遥远云

DOI:
10.1093/mnras/staa1510
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发表时间:
2020
影响因子:
4.8
通讯作者:
Dodonov, Sergei N
Dodonov, Sergei N
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Knese, Erin Darnell;Keel, William C;Knese, Greg;Bennert, Vardha N;Moiseev, Alexei;Grokhovskaya, Aleksandra;Dodonov, Sergei N

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由于发现活动星系核周围的大型电离云,特别是那些与光电离气体潮汐碎片相一致的大部分,我们搜索了以前在Hi中绘制的Seyfert星系周围的[Oiii]发射,其中许多具有扩展的气体特征。在26个Seyfert星系中,我们发现了一个空间扩展的发射特征,一个离散的云从Mkn 1中心向西南方向投射了12 kpc,横向跨度为8 kpc。光谱学(Kast/Lick和SCORPIO/BTA)证实了它与Mkn 1-NGC 451星系对的关联,与附近Histructures的运动学密切匹配,并揭示了活动星系核在大约直接观测到的光度下需要光电离的发射线比。对于整个样品,如果活动星系核在比光到组构的旅行时间更长的尺度上持续明亮,那么电离锥(双锥)的全张角必须<20°。由于典型的活动星系核电离锥被观察到比这更广泛,我们的低检测分数可能会增加证据的普遍存在的强烈变化的活动星系核光度的尺度104- 105年。
Motivated by the discovery of large ionized clouds around AGN, and particularly the large fraction of those that are consistent with photoionized gaseous tidal debris, we searched for [Oiii] emission around Seyfert galaxies previously mapped in Hi, many with extended gas features. Of 26 Seyfert galaxies, we find one spatially extended emission feature, a discrete cloud projected ≈12 kpc SW from the centre of Mkn 1 and spanning a transverse extent of 8 kpc. Optical spectroscopy (Kast/Lick and SCORPIO/BTA) of this cloud confirms its association with the Mkn 1–NGC 451 galaxy pair, closely matching the kinematics of nearby Histructures, and reveals emission-line ratios requiring photoionization by the AGN at roughly the direct observed luminosity of the nucleus. For the entire sample, the full opening angle of the ionization cones (bicones) must be <20° if the AGNs are continuously bright for scales longer than the light-traveltimes to the Histructures. Since typical AGN ionization cones are observed to be much broader than this, our low detection fraction may add to evidence for the ubiquity of strong variations in AGN luminosity on scales 104–105yr.
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