Origin of an orbiting star around the galactic supermassive black hole.

IF 4.4 3区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Proceedings of the Japan Academy. Series B, Physical and Biological Sciences Pub Date : 2024-01-11 Epub Date: 2023-12-25 DOI:10.2183/pjab.100.007

Shogo Nishiyama, Tomohiro Kara, Brian Thorsbro, Hiromi Saida, Yohsuke Takamori, Masaaki Takahashi, Takayuki Ohgami, Kohei Ichikawa, Rainer Schödel

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引用次数: 0

Abstract

The tremendous tidal force that is linked to the supermassive black hole (SMBH) at the center of our galaxy is expected to strongly subdue star formation in its vicinity. Stars within 1'' from the SMBH thus likely formed further from the SMBH and migrated to their current positions. In this study, spectroscopic observations of the star S0-6/S10, one of the closest (projected distance from the SMBH of ≈0''.3) late-type stars were conducted. Using metal absorption lines in the spectra of S0-6, the radial velocity of S0-6 from 2014 to 2021 was measured, and a marginal acceleration was detected, which indicated that S0-6 is close to the SMBH. The S0-6 spectra were employed to determine its stellar parameters including temperature, chemical abundances ([M/H], [Fe/H], [α/Fe], [Ca/Fe], [Mg/Fe], [Ti/Fe]), and age. As suggested by the results of this study, S0-6 is very old (≳10 Gyr) and has an origin different from that of stars born in the central pc region.

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围绕银河系超大质量黑洞的轨道恒星的起源。

巨大的潮汐力与银河系中心的超大质量黑洞(SMBH)有关，预计会强烈抑制其附近的恒星形成。因此，距离SMBH 1英寸以内的恒星很可能在离SMBH更远的地方形成，并迁移到它们目前的位置。在这项研究中，恒星S0-6/S10进行了光谱观测，恒星S0-6/S10是最近的(预计距离SMBH≈0' .3)晚型恒星之一。利用S0-6光谱中的金属吸收谱线，测量了S0-6在2014 - 2021年间的径向速度，并检测到边际加速度，表明S0-6接近SMBH。利用S0-6光谱确定了其恒星参数，包括温度、化学丰度([M/H]、[Fe/H]、[α/Fe]、[Ca/Fe]、[Mg/Fe]、[Ti/Fe])和年龄。根据这项研究的结果，S0-6非常古老(> 10 Gyr)，其起源与诞生在中央pc区域的恒星不同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Japan Academy. Series B, Physical and Biological Sciences 生物-综合性期刊

CiteScore

6.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Proceedings of the Japan Academy Ser. B (PJA-B) is a scientific publication of the Japan Academy with a 90-year history, and covers all branches of natural sciences, except for mathematics, which is covered by the PJA-A. It is published ten times a year and is distributed widely throughout the world and can be read and obtained free of charge through the world wide web.