SERENDIPITOUS DISCOVERY OF AN EXTENDED X-RAY JET WITHOUT A RADIO COUNTERPART IN A HIGH-REDSHIFT QUASAR
SERENDIPITOUS DISCOVERY OF AN EXTENDED X-RAY JET WITHOUT A RADIO COUNTERPART IN A HIGH-REDSHIFT QUASAR
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DOI：
10.3847/2041-8205/816/1/l15
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
A. Simionescu;Ł. Stawarz;Y. Ichinohe;C. Cheung;M. Jamrozy;A. Siemiginowska;K. Hagino;P. Gandhi;N. Werner
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文献类型：
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作者：
A. Simionescu;Ł. Stawarz;Y. Ichinohe;C. Cheung;M. Jamrozy;A. Siemiginowska;K. Hagino;P. Gandhi;N. Werner
钱德拉最近对附近星系团 Abell 585 的观测发现了与高红移背景类星体 B3 0727+409 相关的扩展 X 射线喷流，B3 0727+409 是红移 z = 2.5 的发光射电源。这是迄今为止已知的仅有的少数高红移 X 射线喷流的例子之一。它有约 12 英寸的明显延伸，对应于 ∼100 kpc 的预计长度，可能的热点位于距类星体 35 英寸处。存档的高分辨率甚大阵列地图令人惊讶地显示，除了距离类星体约 1.”4 的一节外，没有扩展的喷流发射。该源的高 X 射线与射电光度比似乎与逆康普顿辐射模型预期的 ∝ ( 1 + z ) 4 ?> 放大一致。这一偶然的发现可能标志着整个类似系统的存在，这些系统具有明亮的X射线和高红移的微弱射电喷流，在得出有关喷流特性的红移演化的任何结论时，以及关于超大质量黑洞和活动星系核的宇宙学演化的结论时，必须考虑到这种选择偏差。
A recent Chandra observation of the nearby galaxy cluster Abell 585 has led to the discovery of an extended X-ray jet associated with the high-redshift background quasar B3 0727+409, a luminous radio source at redshift z = 2.5. This is one of only few examples of high-redshift X-ray jets known to date. It has a clear extension of about 12″, corresponding to a projected length of ∼100 kpc, with a possible hot spot located 35″ from the quasar. The archival high resolution Very Large Array maps surprisingly reveal no extended jet emission, except for one knot about 1.″4 from the quasar. The high X-ray to radio luminosity ratio for this source appears consistent with the ∝ ( 1 + z ) 4 ?> amplification expected from the inverse Compton radiative model. This serendipitous discovery may signal the existence of an entire population of similar systems with bright X-ray and faint radio jets at high redshift, a selection bias that must be accounted for when drawing any conclusions about the redshift evolution of jet properties and indeed about the cosmological evolution of supermassive black holes and active galactic nuclei in general.