Virgo Redux: The Masses and Stellar Content of Nuclei in Early-Type Galaxies from Multi-Band Photometry and Spectroscopy

Abstract

We present an analysis of 39 nuclei and their early-type hosts in the Virgo Cluster using ten broadband filters: F300W, F475W, F850LP, F160W, $u^{\ast }griz$, and $K_s$. We describe the Virgo Redux program, which provides high-resolution UV and NIR imaging. Combining this data with optical and NIR imaging from the ACS Virgo Cluster Survey and the Next Generation Virgo Cluster Survey, we estimate masses, metallicities and ages using simple stellar population (SSP) models. For 19 nuclei, we compare to SSP parameters derived from Keck and Gemini spectra and find reasonable agreement between the photometric and spectroscopic metallicity: the RMS scatter is 0.3 dex. We reproduce the nucleus-galaxy mass fraction of $0.33_{-0.07}^{+0.09}$ percent for galaxy stellar masses $10^{8.4}-10^{10.3}{M}_{\odot }$ with a typical precision of $\sim$35% for the nuclei masses. Based on available model predictions, there is no single preferred formation scenario for nuclei, suggesting that nuclei are formed stochastically through a mix of processes. Nuclei metallicities are statistically identical to those of their hosts, appearing $0.07\pm 0.3$ dex more metal-rich on average -- although, omitting galaxies with unusual origins, nuclei are $0.20\pm 0.28$ dex more metal-rich. Nuclei appear to be $0.56\pm 0.12$ dex more metal rich than ultra-compact dwarf galaxies (UCDs) at fixed mass. We find no clear age difference between nuclei and their galaxies, with nuclei displaying a broad range of ages. Interestingly, we find that the most massive nuclei may be flatter and more closely aligned with the semi-major axes of their hosts, suggesting that they formed through predominantly dissipative processes.

46 pages, 25 figures, 9 tables. Accepted for publication in ApJ

References in corpus (39)

• UV Star Formation Rates in the Local Universe
• A systematic variation of the stellar initial mass function in early-type galaxies
• The ACS Virgo Cluster Survey. VIII. The Nuclei of Early-Type Galaxies
• The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
• Population Synthesis in the Blue IV: Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations
• A Supermassive Black Hole in an Ultracompact Dwarf Galaxy
• The structure of the nuclear stellar cluster of the Milky Way
• The Coincidence of Nuclear Star Clusters and Active Galactic Nuclei
• MegaPipe: the MegaCam image stacking pipeline at the Canadian Astronomical Data Centre
• The AIMSS Project I: Bridging the Star Cluster - Galaxy Divide
• From Supermassive Black Holes to Dwarf Elliptical Nuclei: a Mass Continuum
• Nuclear star clusters in 228 spiral galaxies in the HST/WFPC2 archive: catalogue and comparison to other stellar systems
• Clues to Nuclear Star Cluster Formation from Edge-on Spirals
• The Nature of UCDs: Internal Dynamics from an Expanded Sample and Homogeneous Database
• The Extended Virgo Cluster Catalog
• Measuring Ages and Elemental Abundances from Unresolved Stellar Populations: Fe, Mg, C, N, and Ca
• Galaxy And Mass Assembly (GAMA): ${\mathcal{M}}_{\star }-R_{\mathrm{e}}$ relations of $z=0$ bulges, discs and spheroids
• The HST/ACS Coma Cluster Survey. X. Nuclear star clusters in low-mass early-type galaxies: scaling relations
• Evolution of dwarf early-type galaxies I. Spatially resolved stellar populations and internal kinematics of Virgo cluster dE/dS0 galaxies
• Updated Mass Scaling Relations for Nuclear Star Clusters and a Comparison to Supermassive Black Holes
• Contribution of stripped nuclear clusters to globular cluster and ultra-compact dwarf galaxy populations
• Systematic Uncertainties in Stellar Mass Estimation for Distinct Galaxy Populations
• The Next Generation Virgo Cluster Survey. VI. The Kinematics of Ultra-compact Dwarfs and Globular Clusters in M87
• The formation of ultra-compact dwarf galaxies and nucleated dwarf galaxies
• Self-consistent simulations of Nuclear Cluster formation through Globular Cluster orbital decay and merging
• The Structure of Nuclear Star Clusters in Nearby Late-type Spiral Galaxies from Hubble Space Telescope Wide Field Camera 3 Imaging
• New insights on the formation of nuclear star clusters
• On the rotation of nuclear star clusters formed by cluster-inspirals
• The Next Generation Virgo Cluster Survey. XII. Stellar Populations and Kinematics of Compact, Low-Mass Early-Type Galaxies from Gemini GMOS-IFU Spectroscopy
• The Next Generation Virgo Cluster Survey (NGVS). XXIV. The Red Sequence to $\sim$10${}^6$ L${}_{\odot }$ and Comparisons with Galaxy Formation Models
• Self-Regulated Fueling of Galaxy Centers: Evidence for Star-Formation Feedback in IC342's Nucleus
• Abundance ratios and IMF slope in the dwarf elliptical galaxy NGC~1396 with MUSE
• The ACS Fornax Cluster Survey. IV. Deprojection of the Surface Brightness Profiles of Early-Type Galaxies in the Virgo and Fornax Clusters: Investigating the "Core/Power-Law Dichotomy"
• Potential of colors for determining age and metallicity of stellar populations
• The Next Generation Virgo cluster Survey (NGVS). XXV. Fiducial panchromatic colors of Virgo core globular clusters and their comparison to model predictions
• Deriving physical parameters of unresolved star clusters. II. The degeneracies of age, mass, extinction, and metallicity
• Galaxy And Mass Assembly (GAMA): The unimodal nature of the dwarf galaxy population
• The Influence of Environment on the Chemical Evolution in Low-mass Galaxies
• Young Nuclei in Dwarf Elliptical Galaxies

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• Formation of supermassive black holes in galactic nuclei II: retention and growth of seed intermediate-mass black holes
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• Dwarf galaxies in the MATLAS Survey: Hubble Space Telescope observations of nuclear star clusters
• Detecting Intermediate-Mass Black Holes out to 20 Mpc with ELT/HARMONI: The Case of FCC 119
• LeMMINGs. V. Nuclear activity and bulge properties: a detailed multi-component decomposition of $e$-MERLIN Palomar galaxies with $HST$
• Galaxy mass dependence of metal-enrichment of nuclear star clusters
• MUSE IFU observations of galaxies hosting Tidal Disruption Events
• The Next Generation Virgo Cluster Survey (NGVS). XL. The Morphological Classification of Virgo Cluster Galaxies
• Massive Star Clusters in the Semi-Analytical Galaxy Formation Model L-Galaxies 2020
• Intermediate Mass Black Hole Binary Evolution in Nuclear Star Clusters: the effect of the stellar mass black hole population
• A population of luminous globular clusters and stripped nuclei with elevated mass to light ratios around NGC 5128
• Resolved nuclear kinematics link the formation and growth of nuclear star clusters with the evolution of their early and late-type hosts
• The Nuclear Star Cluster of M 74: a fossil record of the very early stages of a star-forming galaxy