Broad H I absorption in the candidate binary black hole 4C37.11 (B2 0402+379)
Broad H I absorption in the candidate binary black hole 4C37.11 (B2 0402+379)
复制标题
DOI：
10.1051/0004-6361/200911705
复制
发表时间：
2009-02
影响因子：
6.5
通讯作者：
R. Morganti;B. Emonts;T. T. C. F. Astronomy-T.;K. Institute;U. Groningen;Atnf
中科院分区：
文献类型：
--
作者：
R. Morganti;B. Emonts;T. T. C. F. Astronomy-T.;K. Institute;U. Groningen;Atnf
我们报道了Westerbork综合射电望远镜在射电源4C37.11（B2 0402+379）中探测到的极宽的21 cm Hi吸收（FWZI类似于1600 km s（-1））。这个天体被认为是一个超大质量的双黑洞（Rodriguez et al. 2006）。吸收剖面的主要特征是两个分量，间隔约为1100 km s（-1）。4C37.11的HI吸收是不寻常的，因为它是第一个发现广泛吸收集中在宿主星系的系统速度上的情况，而不是像所有其他具有广泛HI吸收的星系那样不对称和蓝移。考虑到吸收的宽度很大，我们认为对Hi吸收的极端性质的一个可能的解释是它是二元黑洞的运动学特征。如果这种解释是正确的，那么从吸收曲线得到的黑洞质量与从椭球体的光度得到的黑洞质量是一致的。如果广泛的吸收确实是由于双黑洞，这一发现证实了气体成分在超大质量黑洞合并过程中的重要性。
We report the discovery of extremely broad 21-cm Hi absorption (FWZI similar to 1600 km s(-1)) detected with the Westerbork Synthesis Radio Telescope in the radio source 4C37.11 (B2 0402+379). This object has been claimed to host a supermassive binary black hole (Rodriguez et al. 2006). The main features in the absorption profile are two components, separated by similar to 1100 km s(-1). The H I absorption in 4C37.11 is unusual because it is the first case where broad absorption is found to be centred on the systemic velocity of the host galaxy and not asymmetric and blueshifted as seen in all other galaxies with broad Hi absorption. Given the large width of the absorption, we suggest that a possible explanation for the extreme properties of the Hi absorption is that it is the kinematical signature of a binary black hole. If this interpretation is correct, the combined black-hole mass derived from the absorption profile is consistent with that derived from the luminosity of the spheroid. If the broad absorption is indeed due to a binary black hole, this finding confirms the importance of the gaseous component in the merging process of supermassive black holes.