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

  • Authors: Mathias Lipka, Jens Thomas, Roberto Saglia, Ralf Bender, Maximilian Fabricius, Gary J. Hill, Matthias Kluge, Martin Landriau, Ximena Mazzalay, Eva Noyola, Taniya Parikh, Jan Snigula

Mathias Lipka et al 2024 The Astrophysical Journal 976 .

  • Provider: AAS Journals

Caption: Figure 16.

Comparison of the local mass-to-light ratio ϒ as a function of radius r[″] for all Virgo dEs as obtained from different models. Each panel shows one dE, with the box showing its VCC-id and the band in which the mass-to-light ratio is measured (see Figure 2). The colored lines show the mass-to-light ratios we derived using dynamical modeling. Dashed lines: the projected ϒ* of the dynamically decomposed stellar component. Solid lines: the total 3D dynamical mass-to-light ratio ϒtot (i.e., including the dark matter). Note that ϒtot is not a projected quantity, as this would include all of the dark matter along the LOS, i.e., even the poorly constrained DM far outside a galaxy’s FOV. This can make the projected ϒ* appear to be higher than the 3D ϒtot values at some radii, even though the latter is by definition the upper bound for the 3D stellar mass-to-light ratios. The gray, dotted horizontal line shows the mass-to-light ratio of the best mass-follows-light model (i.e., a dynamical orbit model with no dark matter and stellar ϒ-gradient). The black dots with error bars show the stellar mass-to-light ratio from the population analysis (Section 2.3) in the two annuli centered around r = 2.″5 and 7.″5. We also draw a connecting line between the two points to highlight a population gradient if it exists.

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