Stellar-mass Measurements in A133 with Magellan/IMACS

Stellar-mass Measurements in A133 with Magellan/IMACS
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DOI:
10.3847/1538-4357/ab7924
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发表时间:
2020-02
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
S. Starikova;A. Vikhlinin;A. Kravtsov;R. Kraft;T. Connor;J. Mulchaey;D. Nagai
S. Starikova;A. Vikhlinin;A. Kravtsov;R. Kraft;T. Connor;J. Mulchaey;D. Nagai
中科院分区:
其他
文献类型:
--
作者:
S. Starikova;A. Vikhlinin;A. Kravtsov;R. Kraft;T. Connor;J. Mulchaey;D. Nagai

文献摘要

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本文利用麦哲伦上的IMACS仪器对A133星系团的深光学成像进行了分析。我们的多波段测光技术可以测量星团成员星系的恒星质量,直到质量极限(≈大麦哲伦星云恒星质量的0.1)。我们观察到星系团内大星系和矮星系的空间分布有明显的差异。分别对这些星系群进行建模,我们可以自信地跟踪锁定在星系中恒星质量分布到星团的虚拟半径。星系团中最亮星系的扩展包层可以追踪到~ 200kpc。中心星系贡献了半径内星团总恒星质量的1/3。
We present the analysis of deep optical imaging of the galaxy cluster A133 with the IMACS instrument on Magellan. Our multi-band photometry enables stellar-mass measurements in the cluster member galaxies down to a mass limit of (≈0.1 of the Large Magellanic Cloud stellar mass). We observe a clear difference in the spatial distribution of large and dwarf galaxies within the cluster. Modeling these galaxy populations separately, we can confidently track the distribution of stellar mass locked in the galaxies to the cluster’s virial radius. The extended envelope of the cluster’s brightest galaxy can be tracked to ∼200 kpc. The central galaxy contributes ∼1/3 of the total cluster stellar mass within the radius .