Constraints on the Cosmic Expansion History from GWTC–3
Constraints on the Cosmic Expansion History from GWTC–3
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DOI：
10.3847/1538-4357/ac74bb
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
The Ligo Scientific Collaboration;The Virgo Collaboration;T. Abbott;H. Abe;F. Acernese;K. Ackley;
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作者：
The Ligo Scientific Collaboration;The Virgo Collaboration;T. Abbott;H. Abe;F. Acernese;K. Ackley;
我们使用来自第三个ligo -处女座-神冈引力波探测器引力波瞬变目录（GWTC-3）的47个引力波源来估计哈勃参数H(z)，包括它的现值，哈勃常数H 0。每个引力波（GW）信号提供了到源的光度距离，我们使用两种方法来估计相应的红移：红移质量和星系目录。利用双黑洞（BBH）的红移质量，我们同时推断了源质量分布和H(z)。源质量分布在34 μ M⊙附近出现峰值，随后下降。假设这个质量尺度不随H(z)测量结果的红移而演变，当与GW170817及其电磁对应的H0测量相结合时，得到H0=68−8+12kms−1Mpc−1（68%可信区间）。这比GWTC-1估计的H 0提高了17%。第二种方法将每个GW事件与它在GLADE+星表中的可能宿主星系联系起来，在统计上边缘化每个事件潜在宿主的红移。假设一个固定的BBH种群，我们用星系目录方法估计H0=68−6+8kms−1Mpc−1，相对于我们的GWTC-1结果提高了42%，相对于最近使用GWTC-2事件的H0研究提高了20%。然而，我们发现这一结果受到BBH源质量分布假设的强烈影响；唯一不受这些假设强烈影响的事件（因此可以提供关于H 0的信息）是定位良好的事件GW190814。
We use 47 gravitational wave sources from the Third LIGO–Virgo–Kamioka Gravitational Wave Detector Gravitational Wave Transient Catalog (GWTC–3) to estimate the Hubble parameter H(z), including its current value, the Hubble constant H 0. Each gravitational wave (GW) signal provides the luminosity distance to the source, and we estimate the corresponding redshift using two methods: the redshifted masses and a galaxy catalog. Using the binary black hole (BBH) redshifted masses, we simultaneously infer the source mass distribution and H(z). The source mass distribution displays a peak around 34 M ⊙, followed by a drop-off. Assuming this mass scale does not evolve with the redshift results in a H(z) measurement, yielding H0=68−8+12kms−1Mpc−1 (68% credible interval) when combined with the H 0 measurement from GW170817 and its electromagnetic counterpart. This represents an improvement of 17% with respect to the H 0 estimate from GWTC–1. The second method associates each GW event with its probable host galaxy in the catalog GLADE+, statistically marginalizing over the redshifts of each event’s potential hosts. Assuming a fixed BBH population, we estimate a value of H0=68−6+8kms−1Mpc−1 with the galaxy catalog method, an improvement of 42% with respect to our GWTC–1 result and 20% with respect to recent H 0 studies using GWTC–2 events. However, we show that this result is strongly impacted by assumptions about the BBH source mass distribution; the only event which is not strongly impacted by such assumptions (and is thus informative about H 0) is the well-localized event GW190814.