Consistent Analysis of the AGN LF in X-Ray and MIR in the XMM-LSS Field
Consistent Analysis of the AGN LF in X-Ray and MIR in the XMM-LSS Field
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DOI：
10.3847/1538-4357/ac37b8
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发表时间：
2021-11
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通讯作者：
J. Runburg;D. Farrah;A. Sajina;M. Lacy;Jenna Lidua;E. Hatziminaoglou;W. Brandt;Chien-Ting J. Chen;K. Nyland;Raphael Shirley;D. Clements;L. K. Pitchford
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作者：
J. Runburg;D. Farrah;A. Sajina;M. Lacy;Jenna Lidua;E. Hatziminaoglou;W. Brandt;Chien-Ting J. Chen;K. Nyland;Raphael Shirley;D. Clements;L. K. Pitchford
活动星系核(AGN)的光度函数探索了超大质量黑洞在宇宙时间内组装和生长的历史。为了缓解选择偏差，我们对XMM-大尺度结构场中X射线和中红外(MIR)选择的活动星系核(AGN)的光度函数(LF)进行了一致性分析。有4268个活动星系核用于构造MIR光度函数(IRLF)，3427个活动星系核用于构建X射线光度函数(XLF)，提供了两个波段最大的活动星系核人口普查结果，z=4，并且显著减少了不确定性。我们第一次能够看到IRLF在z>；2的膝部，并观察到随着红移的增加，微弱的末端斜率变平。根据我们的lfs计算的宇宙黑洞吸积历史的替代辐射光度密度，在z≈2.25时显示出一个峰值，这与最近对恒星形成速率密度的峰值的估计一致。然而，在早期，活动星系核的光度密度比SFRD平坦。如果得到证实，这一结果表明，在z≳2.5时，高质量系统中黑洞质量的积累超过了恒星质量的增长。这与观测到的红移z∼6类星体位于局域M−σ关系之上是一致的。从IRLF得到的光度密度在所有红移都高于从XLF得到的光度密度。这与被遮挡的活动星系核活动在超大质量黑洞宇宙生长中的主导作用是一致的。
The luminosity function of active galactic nuclei (AGN) probes the history of supermassive black hole assembly and growth across cosmic time. To mitigate selection biases, we present a consistent analysis of the AGN luminosity functions (LFs) derived for both X-ray and mid-infrared (MIR) selected AGN in the XMM-Large Scale Structure field. There are 4268 AGN used to construct the MIR luminosity function (IRLF) and 3427 AGN used to construct the X-ray luminosity function (XLF), providing the largest census of the AGN population out to z = 4 in both bands with significant reduction in uncertainties. We are able for the first time to see the knee of the IRLF at z > 2 and observe a flattening of the faint-end slope as redshift increases. The bolometric luminosity density, a proxy for the cosmic black hole accretion history, computed from our LFs, shows a peak at z ≈ 2.25, consistent with recent estimates of the peak in the star formation rate density (SFRD). However, at earlier epochs, the AGN luminosity density is flatter than the SFRD. If confirmed, this result suggests that the build up of black hole mass outpaces the growth of stellar mass in high-mass systems at z ≳ 2.5. This is consistent with observations of redshift z ∼ 6 quasars that lie above the local M − σ relationship. The luminosity density derived from the IRLF is higher than that from the XLF at all redshifts. This is consistent with the dominant role of obscured AGN activity in the cosmic growth of supermassive black holes.