The Flaring H2O Megamaser and Compact Radio Source in Markarian 348
The Flaring H2O Megamaser and Compact Radio Source in Markarian 348
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Markarian 348 中的耀斑 H2O 巨型微波激射器和紧凑型射电源
DOI：
10.1086/374924
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Gallimore
中科院分区：
文献类型：
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作者：
A. Peck;C. Henkel;J. Ulvestad;A. Brunthaler;H. Falcke;M. Elitzur;K. Menten;J. Gallimore
我们报告了在Seyfert 2星系Mrk 348中对燃烧的H2O巨激光的单碟监测和极高角分辨率观测。H2O谱线相对于系统速度红移了约130 km s-1，谱线非常宽，FWHM为130 km s-1，并且在强谱线两侧1500 km s-1范围内没有可检测到的高速分量。用Effelsberg 100 m望远镜进行的监测观测表明，脉泽在短至1天的时间尺度上变化显著，综合线通量与连续通量松散相关。甚长基线阵列（VLBA）观测表明，脉泽发射完全来自一个范围小于0.25%的区域，该区域位于被认为与后退射流有关的连续体成分。本文还报道了利用VLA在1.4 ~ 43 GHz波段进行的综合通量监测，以及VLBA在1.7、8、15和22 GHz波段对毫弧秒尺度射流的连续观测。这些观测结果使我们初步确定了地核的位置，并显示了在当前的射电“耀斑”期间新的喷射成分的喷射。
We report on single-dish monitoring and extremely high angular resolution observations of the flaring H2O megamaser in the Seyfert 2 galaxy Mrk 348. The H2O line is redshifted by ~130 km s-1 with respect to the systemic velocity, is very broad, with an FWHM of 130 km s-1, and has no detectable high-velocity components within 1500 km s-1 on either side of the strong line. Monitoring observations made with the Effelsberg 100 m telescope show that the maser varies significantly on timescales as short as 1 day and that the integrated line flux is loosely correlated with the continuum flux. Very Long Baseline Array (VLBA) observations indicate that the maser emission arises entirely from a region less than 0.25 pc in extent, located toward a continuum component thought to be associated with the receding jet. We also report on integrated flux monitoring with the VLA between 1.4 and 43 GHz, and VLBA continuum observations of the milliarcsecond scale jets at 1.7, 8, 15, and 22 GHz. These observations have allowed us to tentatively pinpoint the location of the core, and also show the ejection of a new jet component during the current radio "flare."