Detection at zapprox. =0. 5 of a 21-cm absorption line in AO 0235+164: The first coincidence of large radio and optical redshifts
Detection at zapprox. =0. 5 of a 21-cm absorption line in AO 0235+164: The first coincidence of large radio and optical redshifts
复制标题
在 zapprox 处进行检测。
DOI：
10.1086/111885
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
A. Wolfe
中科院分区：
文献类型：
--
作者：
Roberts;R. L. Brown;W. Brundage;A. Rots;M. Haynes;A. Wolfe
我们报道了在BL LAC型类星体AO 0235+164的吸收中检测到红移的中性氢。该线发生在932.116 +- 0.005 MHz，对应于红移z=0.52385 +- 0.00001，在误差范围内，与光学推导的红移值相同。这是第一次同时测量射电和光学高红移吸收线。这些红移的巧合产生了对多普勒表达式波长不变性的严格限制，支持了光学线的识别，并产生了对宇宙时间尺度上某些原子量变化的限制。Mg/H丰度的推导是吸收云相对于类星体位置的下限。(AIP)
We report the detection of redshifted neutral hydrogen in absorption against the BL LAC type quasar AO 0235+164 is reported. The line occurs at 932.116 +- .005 MHz corresponding to a redshift z=0.52385 +- 0.00001, a value identical, to within the errors, to the optically derived redshift. This is the first instance in which both radio and optical high-redshift absorption lines are measured. The coincidence of these redshifts yields stringent limits to the constancy of the wavelength invariance of the Doppler expression, supports the optical line identifications, and yields limits on the variation of certain atomic quantities over cosmic time scales. The Mg/H abundance is derived as is a lower limit to the location of the absorbing cloud with respect to the quasar. (AIP)