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arXiv 0903.0299astro-ph.CO
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高红移ULIRGs中的活动星系核/星暴含量

The AGN/starburst content in high redshift ULIRGs

Y. Watabe, G. Risaliti, M. Salvati, E. Nardini, E. Sani, A. Marconi

摘要:

我们应用一个简单的模型,测试本地ULIRGs,解开的活动星系核(AGN)和星暴的贡献亚毫米波和24微米选择ULIRGs观察斯皮策-IRS光谱仪。我们定量地估计了活动星系核对这些源在不同光度和红移范围内的6- 8 μ m静止标架叠加谱的平均贡献,并在与局部超亮红外星系类似的红外辐射热比的假设下,估计了活动星系核/星暴对总红外光度的相对贡献。虽然在亚毫米波段的ULIRGs中,星暴分量总是占主导地位,但我们发现,相对于较低的z天体,在红移z>2.3时,活动星系核的贡献显著增加。最后,我们定量地证实,24微米选择ULIRGs的中红外辐射是由活动星系核分量占主导地位,但星爆分量的贡献显着的热光度。

英文摘要:

We apply a simple model, tested on local ULIRGs, to disentangle the active galactic nucleus (AGN) and starburst contributions in submillimiter and 24um-selected ULIRGs observed with the Spitzer-IRS spectrometer. We quantitatively estimate the average AGN contribution to the stacked 6-8um rest-frame spectra of these sources in different luminosity and redshift ranges, and, under the assumption of similar infrared-to-bolometric ratios as in local ULIRGs, the relative AGN/starburst contributions to the total infrared luminosity. Though the starburst component is always dominant in submillimeter-selected ULIRGs, we find a significant increase of the AGN contribution at redshift z>2.3 with respect to lower z objects. Finally, we quantitatively confirm that the mid-infrared emission of 24um-selected ULIRGs is dominated by the AGN component, but the starburst component contributes significantly to the bolometric luminosity.

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