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arXiv 0710.4863astro-ph
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高红移类星体的近红外自适应光学成像

Near-infrared adaptive optics imaging of high redshift quasars

R. Falomo, A. Treves, J. K. Kotilainen, R. Scarpa, M. Uslenghi

摘要:

研究高红移类星体宿主星系的性质,以探讨星系演化、核活动与超大质量黑洞形成之间的联系。我们结合新的近红外观测的三个高红移类星体(2 < z < 3),在ESO甚大望远镜配备自适应光学,从文献中选择的数据。对于这三个新的天体,我们能够探测到并描述其宿主星系的性质,发现它们与大质量椭圆星系的性质一致,其中一个射电噪类星体的M(R)~ -24.7,两个射电静类星体的M(R)~ -23.8。当结合现有的数据在较低的红移,这些新的观测描绘了一个场景,射电大声类星体的宿主星系被认为是遵循预期的趋势,发光(~5L*)的椭圆星系进行被动演化。这一趋势与z > 1.5的射电星系所遵循的趋势非常相似。射电宁静类星体的宿主也遵循类似的趋势,但平均光度较低(约0.5等)。这些数据表明,类星体宿主星系早在大爆炸后的~2 Gyr就已经完全形成,然后在光度上被动地衰减到现在的时代。

英文摘要:

The properties of high redshift quasar host galaxies are studied, in order to investigate the connection between galaxy evolution, nuclear activity, and the formation of supermassive black holes. We combine new near-infrared observations of three high redshift quasars (2 < z < 3), obtained at the ESO Very Large Telescope equipped with adaptive optics, with selected data from the literature. For the three new objects we were able to detect and characterize the properties of the host galaxy, found to be consistent with those of massive elliptical galaxies of M(R) ~ -24.7 for the one radio loud quasar, and M(R) ~ -23.8 for the two radio quiet quasars. When combined with existing data at lower redshift, these new observations depict a scenario where the host galaxies of radio loud quasars are seen to follow the expected trend of luminous (~5L*) elliptical galaxies undergoing passive evolution. This trend is remarkably similar to that followed by radio galaxies at z > 1.5. Radio quiet quasars hosts also follow a similar trend but at a lower average luminosity (~0.5 mag dimmer). The data indicate that quasar host galaxies are already fully formed at epochs as early as ~2 Gyr after the Big Bang and then passively fade in luminosity to the present epoch.

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。

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