The Initial Mass Function and Other Stellar Properties Across the Core of the Hydra I Cluster*

被引:5
作者
Lonoce, Ilaria [1 ]
Freedman, W. L. [1 ]
Feldmeier-Krause, A. [2 ]
机构
[1] Univ Chicago, Dept Astron & Astrophys, 5640 South Ellis Ave, Chicago, IL 60637 USA
[2] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
基金
美国国家科学基金会;
关键词
EARLY-TYPE GALAXIES; STAR-FORMATION HISTORIES; WARM IONIZED MEDIUM; POPULATION-MODELS; MILKY-WAY; NGC; 3311; ELEMENTAL ABUNDANCE; CHEMICAL EVOLUTION; ATLAS(3D) PROJECT; LICK INDEXES;
D O I
10.3847/1538-4357/acc025
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Hydra I cluster offers an excellent opportunity to study and compare the relic old stellar populations in the core of its two brightest galaxies. In addition, the differing kinematics of the two galaxies allows a test of the local validity of general scaling relations. In this work, we present a direct comparison employing full spectral fitting of new high-quality long-slit optical and near-infrared spectroscopic data. We retrieve age, metallicity, and 19 elemental abundances out to similar to 12 kpc within each galaxy, as well as the Initial Mass Function (IMF) in their central regions. Our results suggest that the inner similar to 5 kpc regions of both galaxies, despite their different masses, formed at the same time and evolved with a similar star formation timescale and chemical enrichment, confirming their early formation in the cluster buildup. Only the overall metallicity and IMF radial profiles show differences connected with their different velocity dispersion profiles. The radial trends of the IMF positively correlate with both [Z/H] and sigma. While the trends of the IMF slope values with metallicity agree with a global trend for both galaxies, the trends with the velocity dispersion exhibit differences. The outer regions show signs of mixed stellar populations with large differences in chemical content compared to the centers, but with similarly old ages.
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页数:26
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