HST photometry of dwarf elliptical galaxies in Coma, and an explanation for the alleged structural dichotomy between dwarf and bright elliptical galaxies

Abstract

We have analyzed archival HST F606W images of 18 dwarf elliptical (dE) galaxy candidates in the Coma Cluster. We model the full radial extent of their light-profiles by simultaneously fitting a PSF-convolved Sersic R^(1/n) model and, when necessary, either a central point-source or a central PSF-convolved Gaussian. The luminosities of the central component L_nuc scale with the host galaxy luminosity L_gal such that L_nuc = 10^(4.76 +/- 0.10)*(L_gal/10^7)^(0.87 +/- 0.26). The underlying host galaxies display systematic departures from an exponential model that are correlated with the model-independent host galaxy luminosity and are not due to biasing from the nuclear component. The Pearson correlation coefficient between log(n) and central galaxy surface brightness mu_0 (excluding the flux from extraneous central components) is -0.83 at a significance level of 99.99%. The Pearson correlation coefficient between the logarithm of the Sersic index `n' and the host galaxy magnitude is -0.77 at a significance of 99.9%. We explain the observed relationship between dE galaxy luminosity and inner logarithmic profile slope (gamma-prime) as a by-product of the correlation between luminosity and Sersic index n. Including, from the literature, an additional 232 dE and E galaxies spanning 10 mag in absolute magnitude (M), the dE galaxies are shown to display a continuous sequence with the brighter E galaxies such that mu_0 brightens linearly with M until core formation causes the most luminous (M_B < -20.5 mag) E galaxies to deviate from this relation. The different behavior of dE and E galaxies in the M-mu_e (and M-<mu>_e) diagram, and the <mu>_e-log(R_e) diagram have nothing to do with core formation, and are in fact expected from the continuous and linear relation between M and mu_0 and M and log(n).

To appear in AJ. 22 pages

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• Merging of Low-Mass Systems and the Origin of the Fundamental Plane
• Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys
• OMEGA - OSIRIS Mapping of Emission-line Galaxies in A901/2: III. - Galaxy Properties Across Projected Phase Space in A901/2
• Constraining the subgrid physics in simulations of isolated dwarf galaxies
• The evolution of the photometric properties of Local Group dwarf spheroidal galaxies
• The parallelism between galaxy clusters and early-type galaxies: I. The light and mass profiles
• Stellar systems following the $R^{1/m}$ luminosity law. III. Photometric, intrinsic, and dynamical properties for all Sérsic indices
• The size--mass and other structural parameter ($n,{\mu }_z,R_z$) relations for local bulges/spheroids from multicomponent decompositions
• Stellar systems following the $R^{1/m}$ luminosity law. IV. The total energy and the central concentration of galaxies
• SDSS J085431.18+173730.5: The First Compact Elliptical Galaxy Hosting an Active Nucleus
• Charged Fuzzy Dark Matter Black Holes
• Galaxy populations in groups and clusters: evidence for a characteristic stellar mass scale at $M_{\ast }\sim 10^{9.5}{M}_{\odot }$
• On the unification of dwarf and giant elliptical galaxies
• Mirages in galaxy scaling relations
• Central X-ray point-sources found to be abundant in low-mass, late-type galaxies predicted to contain an intermediate-mass black hole
• The power spectrum of systematics in cosmic shear tomography and the bias on cosmological parameters
• Hubble Space Telescope Near Infrared Snapshot Survey of 3CR radio source counterparts III: Radio galaxies and quasars in context
• Dissecting the morphological and spectroscopic properties of galaxies in the local Universe: I. Elliptical galaxies
• The structural properties of nearby dwarf galaxies in low density environments -- size, surface brightness and colour gradients
• How non-linear scaling relations unify dwarf and giant elliptical galaxies
• The Structure of Galaxies: II. Fitting Functions and Scaling Relations for Ellipticals
• Overview of the Near-IR S0 galaxy Survey (NIRS0S)
• A new fitting concept for the robust determination of Sérsic model parameters
• Early Type Galaxy Core Phase Densities
• The Morphological Transformation of Red-Sequence Galaxies in the Distant Cluster XMMU J1229+0151
• Stellar cusp and warm dust at the heart of NGC1068
• Morphology, color-magnitude and scaling relations of galaxies in Abell 426
• Dynamics around supermassive black holes
• The discovery of blue-cored dwarf early-type galaxies in isolated environments
• Angular momentum transfer and the size - mass relation in early - type galaxies
• Total and dark mass from observations of galaxy centers with Machine Learning
• Stellar Populations in the Galactic Center
• Nuclear Star Clusters and Bulges
• Testing non-local gravity through Ultra-Diffuse Galaxies kinematics
• One of Everything: The Breakthrough Listen Exotica Catalog
• The contribution of supermassive black holes in stripped nuclei to the supermassive black hole population of UCDs and galaxy clusters
• On the scaling relations of bulges and early-type galaxies
• A critical review of the evidence for M32 being a compact dwarf satellite of M31 rather than a more distant normal galaxy
• The bright galaxy population of five medium redshift clusters. II. Quantitative Galaxy Morphology
• Dwarf Galaxies in the Halo of NGC 891
• Dwarf galaxies in the MATLAS Survey: Hubble Space Telescope observations of nuclear star clusters
• SDSS J122958.84+000138.0: A Compact, Optically red galaxy
• Constraints on Galaxy Structure and Evolution from the Light of Nearby Systems
• Elliptical (E) and ellicular (ES) galaxies in the M_bh-M_*,sph diagram, and a merger-driven explanation for the origin of ES galaxies, anti-truncated stellar discs in lenticular galaxies, and the Sersicification of E galaxy light profiles
• LeMMINGs. V. Nuclear activity and bulge properties: a detailed multi-component decomposition of $e$-MERLIN Palomar galaxies with $HST$
• AVID: Formation and evolution of a coalesced major merger of late-type dwarf galaxies (VCC 479) on the outskirts of the Virgo cluster
• On the Dichotomy between Normal and Dwarf Ellipticals
• A continuum of structure and stellar content from Virgo cluster early-type dwarfs to giants?
• Past, present and Future of the Scaling Relations of Galaxies and Active Galactic Nuclei
• Dynamical Mass Determinations and Scaling Relations of Early-Type Galaxies
• The galactic acceleration scale is imprinted on globular cluster systems of early-type galaxies of most masses and on red and blue globular cluster subpopulations
• An accurate and simple, asymptotically matched deprojection of the Sersic law
• The baryonic mass-size relation of galaxies. II. Implications for the evolutionary paths between star-forming and passive galaxies
• Brought to Light III: Colors of Disk and Clump Substructures in Dwarf Early-Type Galaxies of the Fornax Cluster
• Non-solar abundance ratios trends of dEs in Fornax Cluster using newly defined high resolution indices
• An Extended, Physically Calibrated FP for Elliptical Galaxies
• Resolved nuclear kinematics link the formation and growth of nuclear star clusters with the evolution of their early and late-type hosts