A VLBI search for AGN radio cores in starburst galaxies
A VLBI search for AGN radio cores in starburst galaxies
复制标题
DOI：
10.1086/171377
复制
发表时间：
1992-06
期刊：
影响因子：
--
通讯作者：
C. Lonsdale;C. Lonsdale;H. Smith
中科院分区：
文献类型：
--
作者：
C. Lonsdale;C. Lonsdale;H. Smith
结果显示了 Mk III 18 厘米 VLBI 对一小部分红外亮星系样本的观测结果：四个星爆星系，从光谱来看没有 AGN 的证据，两个 Seyfert 2 星系，以及一个先前未分类的马卡里亚星系。在Mrk 297中，紧凑的射电源位于星系边缘附近的一个不起眼的团块中。这要么是已知的第一个分离核案例（可能是合并过程中破坏的结果），要么是一颗亮度前所未有的射电超新星。尽管检测到了 Seyfert 2 核 Mrk 928b，但在星暴星系 Mrk 201 的核或 Mrk 928a 中没有检测到 VLBI 尺度的发射。 Mrk 620被发现有毫角秒核心，但Mrk 520未被检测到。获得了包括 Mrk 520 在内的五个星系的光谱。结果表明，在发光的星暴星系中，活性核可以有效地被尘埃完全隐藏在光学视野中。结果还支持经典核活动与星爆现象之间的物理或因果联系。
Results are presented of Mk III 18-cm VLBI observations of a small sample of IR-bright galaxies: four starburst galaxies which have no evidence of an AGN from the optical spectrum, two Seyfert 2 galaxies, and one previously unclassified Markarian galaxies. In Mrk 297 the compact radio source lies in an obscure clump near the edge of the galaxy. This is either the first known case of a detached nucleus (presumably as a result of disruption during a merger) or a radio supernova of unprecedented luminosity. No VLBI-scale emission was detected in the nucleus of the starburst galaxy Mrk 201 or in Mrk 928a, although the Seyfert 2 nucleus Mrk 928b was detected. Mrk 620 was found to have a milliarcsecond core, but Mrk 520 was not detected. Optical spectroscopy was obtained for five galaxies, including Mrk 520. It is demonstrated that, in luminous starburst galaxies, an active nucleus can effectively be completely hidden from view in the optical by dust. The results also support a physical or causal connection between classical nuclear activity and the starburst phenomenon.