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arXiv 0803.1623astro-ph
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射电星系红外辐射的起源I:2 Jy样品的中远红外和射电新观测

The origin of the infrared emission in radio galaxies I: new mid- to far-infrared and radio observations of the 2Jy sample

D. Dicken, C. Tadhunter, R. Morganti, C. Buchanan, T. Oosterloo, D. Axon

摘要:

作为一个大型研究的一部分,以调查的射电大声AGN的较长波长的连续发射的性质,我们提出了新的中远红外(MFIR)和高频射电观测的完整样本的2 Jy强大的,南部的射电星系在中等红移(0.05<z<0.7)。利用斯皮策太空望远镜的灵敏度,我们在24,70和160微米的波长下进行了深入的MIPS观测,在24微米处检测到100%的样品,在70微米处检测到90%的样品。在MFIR波段的这种高探测率在中等红移射电星系的样本中是无与伦比的。补充这些结果,我们还提出了新的高频观测(15至24 GHz)从澳大利亚望远镜紧凑阵列(ATCA)和甚大阵列(VLA),这是用来调查的潜在污染的MFIR连续非热同步辐射。与后者的意见,我们检测到的紧凑的核心在59%的完整的样品,并推断,非热污染的MFIR连续是显着的,在最大的30%,我们的总样本。MFIR通量,无线电通量和光谱能量分布的完整的样本在这里,而在第二篇论文中,我们将分析这些数据,并讨论我们的理解的加热机制的温暖/凉爽的尘埃,在宿主星系的恒星形成的影响,和强大的无线电源的统一计划。

英文摘要:

As part of a large study to investigate the nature of the longer wavelength continuum emission of radio-loud AGN, we present new mid to far-infrared (MFIR) and high frequency radio observations for a complete sample of 2Jy powerful, southern radio galaxies at intermediate redshifts (0.05<z<0.7). Utilizing the sensitivity of the Spitzer Space Telescope, we have made deep MIPS observations at the wavelengths of 24, 70 and 160 microns, detecting 100% of our sample at 24 microns, and 90% at 70 microns. This high detection rate at MFIR wavelengths is unparallelled in samples of intermediate redshift radio galaxies. Complementing these results, we also present new high frequency observations (15 to 24Ghz) from the Australia Telescope Compact Array (ATCA) and the Very Large Array (VLA), which are used to investigate the potential contamination of the MFIR continuum by non-thermal synchrotron emission. With the latter observations we detect the compact cores in 59% of our complete sample, and deduce that non-thermal contamination of the MFIR continuum is significant in a maximum of 30% of our total sample. MFIR fluxes, radio fluxes and spectral energy distributions for the complete sample are presented here, while in a second paper we will analyse these data and discuss the implications for our understanding of the heating mechanism for the warm/cool dust, star formation in the host galaxies, and the unified schemes for powerful radio sources.

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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