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arXiv 0905.2518astro-ph.CO
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z=3.65类星体的尘埃辐射

Resolved Dust Emission in a Quasar at z=3.65

D. L. Clements, Glen Petitpas, D. Farrah, E. Hatziminaoglou, T. Babbedge, M. Rowan-Robinson, I. Perez-Fournon, Antonio Hernan-Caballero, Nieves Castro-Rodriguez… 展开作者

D. L. Clements, Glen Petitpas, D. Farrah, E. Hatziminaoglou, T. Babbedge, M. Rowan-Robinson, I. Perez-Fournon, Antonio Hernan-Caballero, Nieves Castro-Rodriguez, C. Lonsdale, J. Surace, A. Franceschini, B. J. Wilkes, H. Smith

摘要:

我们提出了z=3.653类星体SDSS 160705 +533558的亚毫米观测数据,以及光学和红外数据。该天体在远红外和亚毫米波段异常明亮,红外光度约为10^14 L_sun。我们将这种光度归因于活动星系核和星暴辐射的结合,星暴以每年几千个太阳质量的速度形成恒星。亚毫米阵列(SMA)成像观测的分辨率约为1”,表明亚毫米(850微米)辐射扩展到10- 35 kpc的尺度,并偏离光学位置约10 kpc。这种形态与亚毫米级星系中发现的形态不同,亚毫米级星系通常在弧秒尺度上无法分辨或分辨不高,或者亚毫米级活动星系核位于亚毫米级或分子发射的峰值。最简单的解释是,该物体处于一个富含气体的星系(它是星暴的宿主)和一个缺乏气体的活动星系核宿主星系(它是类星体发射的宿主)合并的早期阶段。也有可能是喷流引起的恒星形成可能有助于不寻常的形态。

英文摘要:

We present submillimetre observations of the z=3.653 quasar SDSS160705+533558 together with data in the optical and infrared. The object is unusually bright in the far-IR and submm with an IR luminosity of ~10^14 L_sun. We ascribe this luminosity to a combination of AGN and starburst emission, with the starburst forming stars at a rate of a few thousand solar masses per year. Submillimetre Array (SMA) imaging observations with a resolution ~1" show that the submm (850 micron) emission is extended on scales of 10--35kpc and is offset from the optical position by ~10 kpc. This morphology is dissimilar to that found in submm galaxies, which are generally un- or marginally resolved on arcsecond scales, or submm-luminous AGN where the AGN lies at the peak of the submm or molecular emission. The simplest explanation is that the object is in the early stages of a merger between a gas rich galaxy, which hosts the starburst, and a gas-poor AGN-host galaxy, which is responsible for the quasar emission. It is also possible that jet induced star formation might contribute to the unusual morphology.

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