CO emission in powerful radio galaxies at low and high redshift

被引：0
|
作者：
Evans, AS [1 ]
机构：
[1] CALTECH, Pasadena, CA 91125 USA
来源：
HIGHLY REDSHIFTED RADIO LINES | 1999年 / 156卷
关键词：
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
CO observations of 0 < z < 4 radio galaxies are presented. The L-CO upper limits for the high-redshift powerful radio galaxies (HzPRGs: z > 1, P-408MHz > 10(27) W Hz(-1)) are consistent with no evolution in molecular gas (H-2) mass with redshift and/or radio power. Of the los-redshift powerful radio galaxies (LzPRGs: z < 0.2, P-408MHz > 10(23.5) W Hz(-1)) observed, only one FR II galaxy has been detected in CO, whereas similar to 50% of the radio-compact (FC) and FR I galaxies have been detected. The CO and imaging data to date imply that either FR II galaxies result from mergers of gas-poor galaxies relative to FC/FR I galaxies, or that some FC/FR 1 galaxies evolve into FR II galaxies. In either scenario, the radio activity in powerful radio galaxies is most likely triggered bg a merger event and H-2 may be the fuel for the active galactic nucleus (AGN) in the early stages of the merger.
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页码：74 / 79
页数：2
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