中等中心年龄最亮星系团的恒星形成史

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-10-01 DOI:10.22201/ia.01851101p.2021.57.02.11

J. Umanzor, M. Talavera

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引用次数: 1

摘要

这项工作致力于研究具有中等中心年龄（从5年到10年）的最亮星团星系（BCG）的恒星形成历史（SFH），以确认具有这些年龄的BCG是否代表不同的吸积历史或只是一种随机效应。样本由6个中等中心年龄的BCG和3个老中心年龄（>12Gyr）的BCG组成，作为比较星系。这些星系是用安装在超大望远镜（VLT）中的集成场摄谱仪VIMOS观测到的。SFH是使用恒星群体代码STARLIGHT通过全光谱拟合技术获得的。所分析的中等中心年龄的BCG在z>2时形成了几乎100%的恒星，它们的SFH与旧中心年龄和类似质量的椭圆星系的BCG的SFH相似（MDyn>1011 Mʘ）；因此，这些BCG并不表示不同的SFH。

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STAR FORMATION HISTORIES OF BRIGHTEST CLUSTER GALAXIES WITH INTERMEDIATE CENTRAL AGES

This work is devoted to the study of the star formation histories (SFHs) of the brightest cluster galaxies (BCGs) with intermediate central ages (from 5 to 10Gyr), to confirm if BCGs with these ages represent different accretion histories or simply a stochastic effect. The sample is composed of 6 BCGs with intermediate central ages and 3 BCGs with old central ages (> 12Gyr) as comparison galaxies. The galaxies were observed with the integrated field spectrograph VIMOS installed in the Very Large Telescope (VLT). The SFHs were obtained with the full spectrum fitting technique using the star population code STARLIGHT. The BCGs of intermediate central age analyzed formed almost 100% of their stars at z > 2 and their SFHs are similar to the SFHs of BCGs of old central ages and elliptical galaxies of similar mass (MDyn > 1011 Mʘ); therefore, these BCGs do not represent different SFHs.

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来源期刊

Revista Mexicana de Astronomia y Astrofisica 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Revista Mexicana de Astronomía y Astrofísica, founded in 1974, publishes original research papers in all branches of astronomy, astrophysics and closely related fields. Two numbers per year are issued and are distributed free of charge to all institutions engaged in the fields covered by the RMxAA.