论文标题
在窄线狭窄的Seyfert 1星系中吸收的相对论喷气式
Absorbed relativistic jets in radio-quiet narrow-line Seyfert 1 galaxies
论文作者
论文摘要
狭窄的seyfert 1（NLS1）星系是奇特的活性银河核（AGN）。他们中的大多数人没有显示出强大的无线电发射，但是最近，梅特萨霍维射电望远镜在37 GHz的37 GHz中多次检测到七个无线电（或 - 敏感）的NLS1，表明在这些特殊来源中存在相对主义的喷气机。我们用Karl G. Jansky观察了它们，非常大的阵列（JVLA）以1.6、5.2和9.0 GHz的配置进行了观察。我们的结果表明，这些来源要么在JVLA频段中非常微弱或未检测到。在这些频率下，必须通过同步体的自我吸收来吸收其相对论射流的无线电发射，因为它发生在Gigahertz峰源来源中，或者更有可能通过与Starburst活性或冲击相关的电离气体的筛查筛选来免费吸收。我们的发现在无线电标准上呈现了新的阴影，这似乎越来越频繁地是一个误导性参数。新的高频和高分辨率无线电观察对于检验我们的假设至关重要。
Narrow-line Seyfert 1 (NLS1) galaxies are peculiar active galactic nuclei (AGN). Most of them do not show strong radio emission, but recently seven radio-quiet (or -silent) NLS1s have been detected flaring multiple times at 37 GHz by the Metsähovi Radio Telescope, indicating the presence of relativistic jets in these peculiar sources. We observed them with the Karl G. Jansky Very Large Array (JVLA) in A configuration at 1.6, 5.2, and 9.0 GHz. Our results show that these sources are either extremely faint or not detected in the JVLA bands. At those frequencies, the radio emission from their relativistic jet must be absorbed, either via synchrotron self-absorption as it occurs in gigahertz-peaked sources or, more likely, via free-free absorption by a screen of ionized gas associated with starburst activity or shocks. Our findings cast new shadows on the radio-loudness criterion, which seems to be more and more frequently a misleading parameter. New high-frequency and high-resolution radio observations are essential to test our hypotheses.
