The first sample of spectroscopically confirmed ultra-compact massive galaxies in the Kilo Degree Survey

Abstract

We present results from an ongoing investigation using the Kilo Degree Survey (KiDS) on the VLT Survey Telescope (VST) to provide a census of ultra-compact massive galaxies (UCMGs), defined as galaxies with stellar masses $M_{\star }>8\times 10^{10}{\mathrm{M}}_{\odot }$ and effective radii $R_{\mathrm{e}}<1.5\mathrm{kpc}$. UCMGs, which are expected to have undergone very few merger events, provide a unique view on the accretion history of the most massive galaxies in the Universe. Over an effective sky area of nearly 330 square degrees, we select UCMG candidates from KiDS multi-colour images, which provide high quality structural parameters, photometric redshifts and stellar masses. Our sample of $\sim 1000$ photometrically selected UCMGs at $z<0.5$ represents the largest sample of UCMG candidates assembled to date over the largest sky area. In this paper we present the first effort to obtain their redshifts using different facilities, starting with first results for 28 candidates with redshifts $z<0.5$, obtained at NTT and TNG telescopes. We confirmed, as bona fide UCMGs, 19 out of the 28 candidates with new redshifts. A further 46 UCMG candidates are confirmed with literature spectroscopic redshifts (35 at $z<0.5$), bringing the final cumulative sample of spectroscopically-confirmed lower-z UCMGs to 54 galaxies, which is the largest sample at redshifts below $0.5$. We use these spectroscopic redshifts to quantify systematic errors in our photometric selection, and use these to correct our UCMG number counts. We finally compare the results to independent datasets and simulations.

arXiv commentAccepted for publication on MNRAS, 27 pages, 13 figures, 7 tables. This revised and improved version presents different updates. In particular, systematics and uncertainties in the measurement of the effective radii are now better discussed, and new plots are added

References in corpus (88)

• Stellar population synthesis at the resolution of 2003
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• Accurate photometric redshifts for the CFHT Legacy Survey calibrated using the VIMOS VLT Deep Survey
• The epochs of early-type galaxy formation as a function of environment
• The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
• The Dependence of Star Formation History and Internal Structure on Stellar Mass for 10^5 Low-Redshift Galaxies
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
• Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• Measuring and Modelling the Redshift Evolution of Clustering: the Hubble Deep Field North
• Minor mergers and the size evolution of elliptical galaxies
• Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• The Growth of Massive Galaxies Since z=2
• From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey
• Strong size evolution of the most massive galaxies since z~2
• The size evolution of galaxies since z~3: combining SDSS, GEMS and FIRES
• Wet Disc Contraction to Galactic Blue Nuggets and Quenching to Red Nuggets
• The Galactic disk mass-budget : I. stellar mass-function and density
• A Public Ks-selected Catalog in the COSMOS/UltraVISTA Field: Photometry, Photometric Redshifts and Stellar Population Parameters
• Kinematic Structure of Merger Remnants
• Cosmic Variance and Its Effect on the Luminosity Function Determination in Deep High z Surveys
• Galaxy formation in WMAP1 and WMAP7 cosmologies
• The first and second data releases of the Kilo-Degree Survey
• SPIDER VIII - Constraints on the Stellar Initial Mass Function of Early-type Galaxies from a Variety of Spectral Features
• Newly-quenched galaxies as the cause for the apparent evolution in average size of the population
• How do minor mergers promote inside-out growth of ellipticals, transforming the size, density profile and dark matter fraction?
• Recent Structural Evolution of Early-Type Galaxies: Size Growth from z=1 to z=0
• A simple model for the size-evolution of elliptical galaxies
• Dissipation and Extra Light in Galactic Nuclei: IV. Evolution in the Scaling Relations of Spheroids
• Mergers in Lambda-CDM: Uncertainties in Theoretical Predictions and Interpretations of the Merger Rate
• The third data release of the Kilo-Degree Survey and associated data products
• Superdense massive galaxies in the Nearby Universe
• The Importance of Dry and Mixed Mergers for Early-Type Galaxy Formation
• Dissecting the size evolution of elliptical galaxies since z~1: puffing up vs minor merging scenarios
• Superdense galaxies and the mass-size relation at low redshift
• Superdense Massive Galaxies in Wings Local Clusters
• On the Dearth of Compact, Massive, Red Sequence Galaxies in the Local Universe
• NGC1277: a massive compact relic galaxy in the nearby Universe
• Velocity Dispersions and Dynamical Masses for a Large Sample of Quiescent Galaxies at z > 1: Improved Measures of the Growth in Mass and Size
• Constraining The Assembly Of Normal And Compact Passively Evolving Galaxies From Redshift z=3 To The Present With CANDELS
• Galaxy stellar mass functions of different morphological types in clusters, and their evolution between z=0.8 and z=0
• Central mass-to-light ratios and dark matter fractions in early-type galaxies
• The diverse evolutionary paths of simulated high-z massive, compact galaxies to z=0
• An inventory of the stellar initial mass function in early-type galaxies
• Mild Velocity Dispersion Evolution of Spheroid-like Massive Galaxies since z~2
• Galaxy And Mass Assembly (GAMA): the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph
• Luminous K-band Selected Quasars from UKIDSS
• The evolution of the number density of compact galaxies
• Two new confirmed massive relic galaxies: red nuggets in the present-day Universe
• Massive relic galaxies challenge the co-evolution of SMBHs and their host galaxies
• Photometric redshifts for Quasars in multi band Surveys
• The initial mass function of a massive relic galaxy
• The 2-degree Field Lensing Survey: design and clustering measurements
• The effects of seeing on Sersic profiles
• A single population of red globular clusters around the massive compact galaxy NGC 1277
• 2DPHOT: A Multi-purpose Environment for the Two-dimensional Analysis of Wide-field Images
• The effect of the environment on the stellar mass - size relation of present-day galaxies
• Evolution of galaxy size--stellar mass relation from the Kilo Degree Survey
• A catalogue of photometric redshifts for the SDSS-DR9 galaxies
• Constraints on the merging channel of massive galaxies since z~1
• The Number Density of Quiescent Compact Galaxies at Intermediate Redshift
• MRK 1216 & NGC 1277 - An orbit-based dynamical analysis of compact, high velocity dispersion galaxies
• Expected number of massive galaxy relics in the present-day Universe
• Machine Learning based photometric redshifts for the KiDS ESO DR2 galaxies
• Young ages and other intriguing properties of massive compact galaxies in the Local Universe
• Bottom-heavy initial mass function in a nearby compact L*-galaxy
• Towards a census of super-compact massive galaxies in the Kilo Degree Survey
• Photometric redshift estimation based on data mining with PhotoRApToR
• A cooperative approach among methods for photometric redshifts estimation: an application to KiDS data
• Spectral classification and composites of galaxies in LAMOST DR4
• Dozens of compact and high velocity-dispersion early-type galaxies in Sloan Digital Sky Survey
• Evolution of central dark matter of early-type galaxies up to z ~ 0.8
• The Environment of Massive Quiescent Compact Galaxies at $0.1<z<0.4$ in the COSMOS Field
• The last 6 Gyr of dark matter assembly in massive galaxies from the Kilo Degree Survey
• Ultra deep sub-kpc view of nearby massive compact galaxies
• A cosmological context for compact massive galaxies
• The abundance of compact quiescent galaxies since z ~ 0.6
• Ultramassive dense early-type galaxies: velocity dispersions and number density evolution since z=1.6
• Massive relic galaxies prefer dense environments
• Discovery of Nine Intermediate Redshift Compact Quiescent Galaxies in the Sloan Digital Sky Survey
• Imaging of Three Possible Low Redshift Analogs to High Redshift Compact Red Galaxies
• A Search for Moderate-Redshift Survivors from the Population of Luminous Compact Passive Galaxies at High Redshift
• Compact Quiescent Galaxies at Intermediate Redshifts

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• The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees
• KiDS+VIKING-450: A new combined optical & near-IR dataset for cosmology and astrophysics
• Evolution of galaxy size--stellar mass relation from the Kilo Degree Survey
• The Fornax Deep Survey with VST. IX. The catalog of sources in the FDS area, with an example study for globular clusters and background galaxies
• INSPIRE: INvestigating Stellar Population In RElics -- I. Survey presentation and pilot program
• Galaxy and Mass Assembly (GAMA): Accurate number densities & environments of massive ultracompact galaxies at 0.02 < z < 0.3
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• GAlaxy Light profile convolutional neural NETworks (GaLNets). I. fast and accurate structural parameters for billion galaxy samples
• INSPIRE: INvestigating Stellar Population In RElics II. First Data Release (DR1)
• INSPIRE: INvestigating Stellar Population In RElics III. Second data release (DR2): testing the systematics on the stellar velocity dispersion
• Disc cloaking: Establishing a lower limit to the number density of local compact massive spheroids/bulges and the potential fate of some high-z red nuggets
• INSPIRE: INvestigating Stellar Population In RElics IV. The Initial Mass Function slope in relics
• The evolution of compact massive quiescent and starforming galaxies derived from the $R_e-R_h$ and $M_{\mathrm{star}}-M_h$ relations
• AMICO galaxy clusters in KiDS-DR3: galaxy population properties and their redshift dependence
• Compact galaxies and the size-mass galaxy distribution from a colour-selected sample at 0.04 < z < 0.15 supplemented by ugrizYJHK photometric redshifts
• Central velocity dispersion catalog of LAMOST-DR7 galaxies
• Nature versus nurture: relic nature and environment of the most massive passive galaxies at $z<0.5$
• Globular Cluster Systems of Massive Compact Elliptical Galaxies in the Local Universe: Evidence for Relic Red Nuggets?
• Environments of red nuggets at z~0.7 from the VIPERS survey
• Astroinformatics based search for globular clusters in the Fornax Deep Survey
• The central dark matter fraction of massive early-type galaxies
• Toward a stellar population catalog in the Kilo Degree Survey: the impact of stellar recipes on stellar masses and star formation rates
• Total and dark mass from observations of galaxy centers with Machine Learning
• INSPIRE: INvestigating Stellar Populations In RElics. IX. KiDS J0842+0059: the first fully confirmed relic beyond the local Universe
• Lenses In VoicE (LIVE): Searching for strong gravitational lenses in the VOICE@VST survey using Convolutional Neural Networks
• Star-Galaxy Classification in Deep LSST Data with Random Forest: A Pilot study on the Data Preview 1 Release