The VIRUS-dE Survey. I. Stars in Dwarf Elliptical Galaxies-3D Dynamics and Radially Resolved Stellar Initial Mass Functions

被引：0

作者：

Lipka, Mathias ^{[1
,2
]}

Thomas, Jens ^{[1
,2
]}

Saglia, Roberto ^{[1
,2
]}

Bender, Ralf ^{[1
,2
]}

Fabricius, Maximilian ^{[1
,2
]}

Hill, Gary J. ^{[3
,4
]}

Kluge, Matthias ^{[1
,2
]}

Landriau, Martin ^{[5
]}

Mazzalay, Ximena ^{[1
]}

Noyola, Eva ^{[4
]}

Parikh, Taniya ^{[1
]}

Snigula, Jan ^{[1
,2
]}

机构：

[1] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[2] Univ Sternwarte Munchen, Scheinerstr 1, D-81679 Munich, Germany

[3] Univ Texas Austin, McDonald Observ, 2515 Speedway Blvd, Stop C1402, Austin, TX 78712 USA

[4] Univ Texas Austin, Dept Astron, 2515 Speedway Blvd, Stop C1400, Austin, TX 78712 USA

[5] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA USA

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 976卷 / 01期

关键词：

DIGITAL SKY SURVEY; SAMI GALAXY SURVEY; TO-LIGHT RATIO; SDSS-IV MANGA; SIGHT VELOCITY DISTRIBUTIONS; SUPERMASSIVE BLACK-HOLES; DARK-MATTER FRACTION; VIRGO-CLUSTER SURVEY; ANGULAR-MOMENTUM; SCALING RELATIONS;

D O I：

10.3847/1538-4357/ad7bac

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze the stellar structure of a sample of dwarf ellipticals (dEs) inhabiting various environments within the Virgo cluster. Integral-field observations with a high spectral resolution allow us to robustly determine their low-velocity dispersions (similar to 25 km s-1) and higher-order kinematic moments out to the half-light radius. We find the dEs exhibit a diversity in ages, with the younger dEs being less enhanced than the older, suggesting a complex star formation history for those dEs that recently entered Virgo, while others have been quenched shortly after reionization. Orbit-superposition modeling allowed us to recover viewing angles, stellar mass-to-light ratios (with gradients), as well as the intrinsic orbit structure. We find that the angular momentum of the dEs is strongly suppressed compared to ordinary early-type galaxies and correlates with the environment. Flattened dEs are so because of a suppressed kinetic energy perpendicular to their equatorial plane. Combining population and dynamical modeling results, we find an age-dependent stellar initial mass function or, alternatively, evidence for a more extended star formation history for those galaxies that have had higher initial mass and/or inhabited lower-density environments. dEs appear to have a spatially homogeneous stellar structure, but the state they were "frozen" in as they stopped forming stars varies dramatically according to their initial conditions.

引用

页数：42