Supermassive black holes in disc-dominated galaxies outgrow their bulges and co-evolve with their host galaxies
Supermassive black holes in disc-dominated galaxies outgrow their bulges and co-evolve with their host galaxies
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DOI：
10.1093/mnras/stx1340
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发表时间：
2017-05
影响因子：
4.8
通讯作者：
B. Simmons;B. Simmons;R. Smethurst;C. Lintott
中科院分区：
文献类型：
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作者：
B. Simmons;B. Simmons;R. Smethurst;C. Lintott
星系和它们的超大质量黑洞之间的深层联系是现代天体物理学和宇宙学的核心。观测到的星系和黑洞质量之间的相关性通常归因于主要合并对两者的贡献。我们利用了一个星系样本，这些星系的盘状形态表明没有大合并的历史，并表明这样的系统能够以类似于类星体的速度增长超大质量黑洞。将黑洞质量与膨胀质量的保守上限进行比较，我们发现，如果产生膨胀的过程也是黑洞增长的主要驱动力，则样本中的黑洞通常比预期的大。对于没有合并的样本和经历了大量合并的样本，发现黑洞与星系的恒星总质量之间的关系是相同的，这表明主要合并在控制星系和黑洞的共同演化方面没有起到显著的作用。我们认为，有助于星系组装的更基本的过程也是黑洞增长的原因。
The deep connection between galaxies and their supermassive black holes is central to modern astrophysics and cosmology. The observed correlation between galaxy and black hole mass is usually attributed to the contribution of major mergers to both. We make use of a sample of galaxies whose disc-dominated morphologies indicate a major-merger-free history and show that such systems are capable of growing supermassive black holes at rates similar to quasars. Comparing black hole masses to conservative upper limits on bulge masses, we show that the black holes in the sample are typically larger than expected if processes creating bulges are also the primary driver of black hole growth. The same relation between black hole and total stellar mass of the galaxy is found for the merger-free sample as well as a sample that has experienced substantial mergers, indicating that major mergers do not play a significant role in controlling the co-evolution of galaxies and black holes. We suggest that more fundamental processes that contribute to galaxy assembly are also responsible for black hole growth.