The impact of black hole scaling relation assumptions on the mass density of black holes
The impact of black hole scaling relation assumptions on the mass density of black holes
复制标题
黑洞标度关系假设对黑洞质量密度的影响
DOI：
10.1093/mnras/stad2146
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发表时间：
2023
影响因子：
4.8
通讯作者：
Simon, Joseph
中科院分区：
文献类型：
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作者：
Matt, Cayenne;Gültekin, Kayhan;Simon, Joseph
我们研究了超大质量黑洞（SMBH）质量尺度关系选择对红移后推断的SMBH质量总体的影响。为了对引力波背景（GWB）做出可靠的预测，我们必须对SMBH的基本人口结构有一个坚实的了解。利用SDSS和3D-HST + CANDELS对0 <z< 3的测量，我们评估了两个SMBH -星系尺度关系：MBH-MbulgeandMBH -σ推断出的SMBH质量。我们的SMBH质量函数直接来自恒星质量测量值forMBH - mbulge，间接来自恒星质量和星系半径测量值以及星系质量基本平面forMBH -σ。我们发现在预测中有很大的差异，特别是在z= 1时，这种差异在z= 3时增加。特别是，我们发现使用速度色散可以预测更多质量大于109M⊙的SMBHs。脉冲星计时阵列发现的GWB的振幅比基于本地SMBH质量星系尺度关系的高红移外推的GWB预测的振幅要高。不同标度关系导致的SMBH人口统计差异可能是信号幅度与预测不匹配的根源。总的来说，我们的结果表明，如果我们要从他们的预测中获得重要的见解，就需要更深入地了解这些关系的潜在红移演化。
We examine the effect of supermassive black hole (SMBH) mass scaling relation choice on the inferred SMBH mass population since redshiftz∼ 3. To make robust predictions for the gravitational wave background (GWB), we must have a solid understanding of the underlying SMBH demographics. Using the SDSS and 3D-HST + CANDELS surveys for 0 <z< 3, we evaluate the inferred SMBH masses from two SMBH–galaxy scaling relations:MBH–MbulgeandMBH–σ. Our SMBH mass functions come directly from stellar mass measurements forMBH–Mbulge, and indirectly from stellar mass and galaxy radius measurements along with the galaxy mass fundamental plane forMBH–σ. We find that there is a substantial difference in predictions especially forz> 1, and this difference increases out toz= 3. In particular, we find that using velocity dispersion predicts a greater number of SMBHs with masses greater than 109M⊙. The GWB that pulsar timing arrays find evidence for is higher in amplitude than expected from GWB predictions which rely on high-redshift extrapolations of local SMBH mass–galaxy scaling relations. The difference in SMBH demographics resulting from different scaling relations may be the origin for the mismatch between the signal amplitude and predictions. Generally, our results suggest that a deeper understanding of the potential redshift evolution of these relations is needed if we are to draw significant insight from their predictions atz> 1.