Unravelling features of the peculiar galaxy ESO 287-IG50.

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysics and Space Science Pub Date : 2024-09-03 DOI:10.1007/s10509-024-04350-2
P. Freitas-Lemes, P. C. da Rocha-Poppe, M. Faúndez-Abans, M. de Oliveira-Abans, I. Rodrigues, J. Tello, V. A. Fernandes-Martin
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Abstract

This observational study investigates the effects of interaction on the kinematics and chemical abundance of the peculiar galaxy ESO 287-IG50, which may be a polar ring galaxy in an ongoing formation process. The study utilized BVRI broad band imagery and longslit spectroscopy in the wavelength range of 4240-8700 Å. The STARLIGHT stellar population synthesis code was used to analyze the data, and standard diagnostic diagrams were employed to classify the main ionizing source of selected emission-line regions. Image analysis using filtering techniques revealed an inner ring with perpendicular structures at both ends, which could be the inner part of a bisymmetric spiral structure. Photometric analysis showed dusty filaments crossing the central structure, which was identified as the redder region of the galaxy, dominated by a non-negligible amount of dust. Shell-like structures, which could be remnants of a galaxy merging process, were also found. Image analysis through filtering revealed what appears to be an inner ring, with perpendicular structures at both ends, which could be the inner part of a bisymmetric spiral structure. Photometric analysis shows dusty filaments crossing the central structure. This region would be dominated by a non negligible amount of dust, identified as the redder region of the galaxy. A heliocentric radial velocity of 17 689±45 km s−1 was measured, and the velocity profile exhibited a clear rotational behavior, with peak velocities of 110 km s−1 to the SW and 80 km s−1 to the other side. The analysis of the nuclear region using the STARLIGHT code revealed a stellar population consisting of approximately one-third young stars and two-thirds old stars. The predominance of an aged stellar population, a distinctive feature in galaxies undergoing interaction processes, can be attributed to the prolonged evolutionary period of this galaxy, as evidenced by the shell structures we identified as indicators of this interaction process. The [NII]\(\lambda \)6584Å/H\(\alpha \) ratio suggests that ESO 287-IG50 may be an AGN due to the excess of Nitrogen relative to Hydrogen in the residual spectrum, a feature not yet reported in the literature. Studying the line ratios and EW(H\(\alpha \)), we notice that this galaxy exhibits a peculiar AGN, with a non-stellar origin ionization mechanism.

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揭示奇特星系ESO 287-IG50的特征。
这项观测研究调查了相互作用对奇特星系ESO 287-IG50的运动学和化学丰度的影响,该星系可能是一个正在形成过程中的极环星系。这项研究利用了波长范围为 4240-8700 Å 的 BVRI 宽带图像和长照光谱。使用 STARLIGHT 恒星群合成代码分析数据,并使用标准诊断图对选定发射线区域的主要电离源进行分类。利用滤波技术进行的图像分析发现了一个内环,其两端具有垂直结构,这可能是一个双对称螺旋结构的内部部分。光度分析表明,尘埃细丝穿过中央结构,被确定为星系中较红的区域,主要由不可忽略的尘埃构成。此外,还发现了贝壳状结构,可能是星系合并过程的残留物。通过滤波进行的图像分析发现了一个看似内环的东西,两端有垂直的结构,可能是一个双对称螺旋结构的内部部分。光度分析显示,尘埃丝穿过中央结构。这个区域主要由不可忽略的尘埃组成,被确定为星系中较红的区域。测得的日心径向速度为 17 689±45 km s-1,速度曲线表现出明显的旋转行为,西南方向的峰值速度为 110 km s-1,另一侧为 80 km s-1。利用 STARLIGHT 代码对核区域进行的分析表明,恒星群大约由三分之一的年轻恒星和三分之二的老龄恒星组成。老龄恒星群占优势是正在经历相互作用过程的星系的一个显著特点,这可以归因于这个星系的演化时间较长,我们发现的作为相互作用过程指标的壳结构就是证明。NII]\(\lambda \)6584Å/H\(\alpha \)比值表明ESO 287-IG50可能是一个AGN,因为残余光谱中氮相对于氢的含量过多,而这一特征在文献中还没有报道过。通过研究线比率和EW(H\(\alpha \)),我们注意到这个星系表现出一种奇特的AGN,具有非恒星起源的电离机制。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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