arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0704.3583astro-ph
收藏

超亮红外星系IRAS 10190+1322的亚弧秒CO(1-0)和CO(2-1)观测

Sub-arcsecond CO(1-0) and CO(2-1) observations of the ultraluminous infrared galaxy IRAS 10190+1322

J. Gracia-Carpio, P. Planesas, L. Colina

摘要:

利用IRAM干涉仪对超亮红外星系(ULIRG)IRAS 10190+1322的CO(1-0)和CO(2-1)辐射进行了高分辨率成像,其角分辨率可达~0.3角秒。该天体由两个相互作用的星系组成,预计核间距为6千秒差距,选择该天体是为了分析每个星系中分子气体的物理和动力学特性,以研究导致一对星系在红外线中变得超亮的条件。除了最近的ULIRG Arp 220外,这是第一次在ULIRG系统的两个相互作用星系中从形态学和运动学上分辨出CO发射。在其中一个星系中,分子气体高度集中,分布在一个1.7千秒差距大小的环核盘中。在这个可能不太红外发光的星系中,分子气体分布在一个更大的7.4千秒差距的圆盘中。分子气体质量占每个星系动力学质量的约10%。这两个天体都富含分子气体(Mgas ~ 4 10^9 Msun),足以经历红外超亮阶段。

英文摘要:

We present the results of high resolution mapping of the CO(1-0) and CO(2-1) emission of the ultraluminous infrared galaxy (ULIRG) IRAS 10190+1322, with the IRAM interferometer, down to an angular resolution of ~0.3 arcsec. This object is composed of two interacting galaxies with a projected nuclear separation of 6 kpc, and was selected to analyze the physical and dynamical properties of the molecular gas in each galaxy in order to study the conditions that lead a galaxy pair to become ultraluminous in the infrared. With the exception of Arp 220, the closest ULIRG, this is the first time that the CO emission is morphologically and kinematically resolved in the two interacting galaxies of a ULIRG system. In one of the galaxies the molecular gas is highly concentrated, distributed in a circumnuclear disk of 1.7 kpc in size. The molecular gas in the presumably less infrared luminous galaxy is distributed in a more extended disk of 7.4 kpc. The molecular gas mass accounts for ~10% of the dynamical mass in each galaxy. Both objects are rich enough in molecular gas, Mgas ~ 4 10^9 Msun, as to experience an infrared ultraluminous phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑