arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2204.12499astro-ph.GA
收藏

3C 186中潜在黑洞候选者的宿主星系:z=1星系团中心的一个旧的主要合并遗迹

The Host Galaxy of the Recoiling Black Hole Candidate in 3C 186: An Old Major Merger Remnant at the Center of a z=1 Cluster

T. Morishita, M. Chiaberge, B. Hilbert, E. Lambrides, L. Blecha, S. Baum, S. Bianchi, A. Capetti, G. Castignani, F. D. Macchetto, G. K. Miley, C. P. O'Dea, C. A. Norman

摘要:

3C 186是$z=1.0685$的一个射电大声类星体,先前有报道称其与宿主星系有速度和空间偏移,并被认为是由黑洞合并引发的引力波反冲黑洞的有希望的候选者。另一种可能的情况是3C 186正在进行星系合并,表现出暂时的位移。在这项研究中,我们提出了新的深HST/WFC 3-IR和ACS图像的分析,旨在表征宿主星系和测试这种替代方案。我们仔细测量了主机的轻重量中心,并揭示了一个显着的空间偏移类星体核心($11.1\pm0.1$ kpc)。确认的偏移方向几乎垂直于射电喷流。我们没有发现最近合并的证据,例如在扰动的郊区的年轻恒星爆发,但在F160 W中只有$\sim30$ kpc的边缘光浓度。宿主由成熟的($>200$ Myr)恒星星族和一个致密的恒星形成区组成。我们比较流体动力学模拟,发现这些观察到的功能是一致的,在后期合并残留。综上所述,这些证据表明,该系统不是一个正在进行的/年轻的合并残余物,这表明反冲黑洞场景仍然是3C 186令人费解的性质的合理解释。

英文摘要:

3C186, a radio-loud quasar at $z=1.0685$, was previously reported to have both velocity and spatial offsets from its host galaxy, and has been considered as a promising candidate for a gravitational wave recoiling black hole triggered by a black hole merger. Another possible scenario is that 3C186 is in an on-going galaxy merger, exhibiting a temporary displacement. In this study, we present analyses of new deep HST/WFC3-IR and ACS images, aiming to characterize the host galaxy and test this alternative scenario. We carefully measure the light-weighted center of the host and reveal a significant spatial offset from the quasar core ($11.1\pm0.1$kpc). The direction of the confirmed offset aligns almost perpendicularly to the radio jet. We do not find evidence of a recent merger, such as a young starburst in disturbed outskirts, but only marginal light concentration in F160W at $\sim30$kpc. The host consists of matured ($>200$Myr) stellar populations and one compact star-forming region. We compare with hydro-dynamical simulations and find that those observed features are consistently seen in late-stage merger remnants. Taken together, those pieces of evidence indicate that the system is not an on-going/young merger remnant, suggesting that the recoiling black hole scenario is still a plausible explanation for the puzzling nature of 3C186.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑