论文标题

GW190425是否比快速合并通道需要替代的编队途径?

Does GW190425 require an alternative formation pathway than a fast-merging channel?

论文作者

Safarzadeh, Mohammadtaher, Ramirez-Ruiz, Enrico, Berger, Edo

论文摘要

Ligo/Wigo科学合作(LVC)最近宣布检测紧凑的对象二进制合并GW190425,总质量为$ 3.4^{+0.3} _ { - 0.1} $ M $ _ {\ odot} $,以及大约1.1 to 2.1 to.1 to.1 to.5 $ m的单个组件质量。如果组成型紧凑型物体是中子星,则总质量为五个标准偏差,高于$ 2.66 \ pm 0.12 $ M $ _ {\ odot} $的平均值,用于银河系二进制中子星(BNSS)。 LVC表明,这种庞大的BNS系统是从快速通道诞生的,因此,它们在银河系中的非检测是由于选择效应所致。但是,我们无法从报告的合并率,$ \ Mathcal {rm} _ {\ rm GW190425} = 460^{+1050} _ { - 390} $ yr $^{ - 1} $ gpc $ gpc $^{ - 3} $ bn for Predictions $ bn,我们无法调和$ GPC $^{ - 3} $,我们无法调查bn System,我们无法调和推断的形成效率。 Moreover, the comparable merger rates of GW190425, and GW170817 are possibly in tension with our results for two reasons: (i) more massive systems are expected to have a lower formation rate, and (ii) fast merging channels should constitute $\lesssim 10\%$ of the total BNS systems if case BB unstable mass transfer is permitted to take place as a formation pathway.我们认为,作为BNS系统所需的GW190425的高合并率需要:(i)重新审视我们对Supernova爆炸中NS形成的理解,或(ii):更大的NSS必须优先出生于非常弱或非常高的磁场,以使它们在广播电台中不可能。也许在NS-White矮人二进制文件中检测到的大量NS是我们对GW190425系统的形成路径的线索。

The LIGO/Virgo Scientific Collaboration (LVC) recently announced the detection of a compact object binary merger, GW190425, with a total mass of $3.4^{+0.3}_{-0.1}$ M$_{\odot}$, and individual component masses in the range of about 1.1 to 2.5 $M_{\odot}$. If the constituent compact objects are neutron stars, then the total mass is five standard deviations higher than the mean of $2.66\pm 0.12$ M$_{\odot}$ for Galactic binary neutron stars (BNSs). LVC suggests such massive BNS systems are born from a fast-merging channel, and therefore, their non-detection in the Galaxy to be due to a selection effect. However, we are unable to reconcile the inferred formation efficiency from the reported merger rate, $\mathcal{R}_{\rm GW190425}=460^{+1050}_{-390}$ yr$^{-1}$ Gpc$^{-3}$, with predictions from our own study for fast-merging BNS systems. Moreover, the comparable merger rates of GW190425, and GW170817 are possibly in tension with our results for two reasons: (i) more massive systems are expected to have a lower formation rate, and (ii) fast merging channels should constitute $\lesssim 10\%$ of the total BNS systems if case BB unstable mass transfer is permitted to take place as a formation pathway. We argue that to account for the high merger rate of GW190425 as a BNS system requires: (i) revisiting our understanding of NS formation in supernova explosions, or (ii): that more massive NSs need to be preferentially born with either very weak or very high magnetic fields so that they would be undetectable in the radio surveys. Perhaps massive NSs detected in NS-white dwarf binaries are our clues to the formation path of GW190425 systems.

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