Composite Bulges: The Coexistence of Classical Bulges and Disky Pseudobulges in S0 and Spiral Galaxies

Abstract

We study nine S0-Sb galaxies with (photometric) bulges consisting of two distinct components. The outer component is a flattened, kinematically cool, disklike structure: a "disky pseudobulge". Embedded inside is a rounder, kinematically hot spheroid: a "classical bulge". This indicates that pseudobulges and classical bulges are not mutually exclusive: some galaxies have both. The disky pseudobulges almost always have an exponential disk (scale lengths = 125-870 pc, mean $\sim 440$ pc) with disk-related subcomponents: nuclear rings, bars, and/or spiral arms. They constitute 11-59% of the galaxy stellar mass (mean PB/T = 0.33), with stellar masses $\sim 7\times 10^9$-$9\times 10^{10}{M}_{\odot }$. Classical-bulge components have Sersic indices of 0.9-2.2, effective radii of 25-430 pc and stellar masses of $5\times 10^8$-$3\times 10^{10}{M}_{\odot }$ (usually < 10% of the galaxy's stellar mass; mean B/T = 0.06). The classical bulges show rotation, but are kinematically hotter than the disky pseudobulges. Dynamical modeling of three systems indicates that velocity dispersions are isotropic in the classical bulges and equatorially biased in the disky pseudobulges. In the mass--radius and mass--stellar mass density planes, classical-bulge components follow sequences defined by ellipticals and (larger) classical bulges. Disky pseudobulges also fall on this sequence; they are more compact than similar-mass large-scale disks. Although some classical bulges are quite compact, they are distinct from nuclear star clusters in both size and mass, and coexist with nuclear clusters in at least two galaxies. Since almost all the galaxies in this study are barred, they probably also host boxy/peanut-shaped bulges (vertically thickened inner parts of bars). NGC 3368 shows evidence for such a zone outside its disky pseudobulge, making it a galaxy with all three types of "bulge".

arXiv commentpdflatex, 44 pages, 26 figures. Accepted by Monthly Notices

References in corpus (95)

• The Sloan Digital Sky Survey: Technical Summary
• The Seventh Data Release of the Sloan Digital Sky Survey
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• The Optical and Near-Infrared Properties of Galaxies: I. Luminosity and Stellar Mass Functions
• Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
• The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances
• The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of Fast and Slow Rotators
• Old Stellar Populations. VI. Absorption-Line Spectra of Galaxy Nuclei and Globular Clusters
• The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies
• The SAURON project -- X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/sigma,epsilon) diagram with integral-field stellar kinematics
• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• The ACS Fornax Cluster Survey. V. Measurement and Recalibration of Surface Brightness Fluctuations and a Precise Value of the Fornax--Virgo Relative Distance
• Structure and Kinematics of the Stellar Halos and Thick Disks of the Milky Way Based on Calibration Stars from SDSS DR7
• The SAURON project - III. Integral-field absorption-line kinematics of 48 elliptical and lenticular galaxies
• A Close Look at Star Formation around Active Galactic Nuclei
• Axisymmetric Dynamical Models of the Central Regions of Galaxies
• A Revised Parallel-Sequence Morphological Classification of Galaxies: Structure and Formation of S0 and Spheroidal Galaxies
• The structure of galactic disks: Studying late-type spiral galaxies using SDSS
• The Structure of Classical Bulges And Pseudobulges: The Link Between Pseudobulges And Sersic Index
• Bulge Formation by the Coalescence of Giant Clumps in Primordial Disk Galaxies
• Bulgeless Giant Galaxies Challenge our Picture of Galaxy Formation by Hierarchical Clustering
• Bulge n and B/T in High Mass Galaxies: Constraints on the Origin of Bulges in Hierarchical Models
• Supermassive black holes do not correlate with galaxy disks or pseudobulges
• Gas Physics, Disk Fragmentation, and Bulge Formation in Young Galaxies
• Masses of star clusters in the nuclei of bulge-less spiral galaxies
• Precise Black Hole Masses From Megamaser Disks: Black Hole-Bulge Relations at Low Mass
• Bars and Warps traced by the Molecular Gas in the Seyfert 2 Galaxy NGC 1068
• The black hole mass -- stellar velocity dispersion correlation: bulges versus pseudobulges
• Anti-Truncation of Disks in Early-Type Barred Galaxies
• Quantifying the Coexistence of Massive Black Holes and Dense Nuclear Star Clusters
• The Outer Disks of Early-Type Galaxies. I. Surface-Brightness Profiles of Barred Galaxies
• A HST Census of Nuclear Star Clusters in Late-Type Spiral Galaxies: II. Cluster Sizes and Structural Parameter Correlations
• Near-IR and Optical Morphology of Spiral Galaxies
• Stellar populations in the nuclei of late-type spiral galaxies
• AINUR: Atlas of Images of NUclear Rings
• The Milky Way Tomography with SDSS: III. Stellar Kinematics
• The SAURON project - VIII. OASIS/CFHT integral-field spectroscopy of elliptical and lenticular galaxy centres
• Bulges Of Nearby Galaxies With Spitzer: Scaling Relations in Pseudobulges and Classical Bulges
• Galactic Bulges
• The NGC 404 Nucleus: Star Cluster and Possible Intermediate Mass Black Hole
• Families of dynamically hot stellar systems over ten orders of magnitude in mass
• Box- and peanut-shaped bulges: I. Statistics
• Photometric scaling relations of lenticular and spiral galaxies
• Stellar Feedback & Bulge Formation in Clumpy Disks
• Rotation and anisotropy of galaxies revisited
• High-Dispersion Spectroscopy of Luminous, Young Star Clusters: Evidence for Present-Day Formation of Globular Clusters
• Bar-induced perturbation strengths of the galaxies in the Ohio State University Bright Galaxy Survey (OSUBGS) I
• K-Band Observations of Boxy Bulges. I. Morphology and Surface Brightness Profiles
• Redshift-Distance Survey of Early-Type Galaxies: Spectroscopic Data
• Demographics of Bulge Types within 11 Mpc and Implications for Galaxy Evolution
• Mapping stationary axisymmetric phase-space distribution functions by orbit libraries
• Kinematics of Ten Early-Type Galaxies from HST and Ground-Based Spectroscopy
• Stellar mass estimates in early-type galaxies: procedures, uncertainties and models dependence
• A Search for Counter-Rotating Stars in S0 Galaxies
• A Search for "Dwarf" Seyfert Nuclei. VII. A Catalog of Central Stellar Velocity Dispersions of Nearby Galaxies
• An Imaging Survey of Early-Type Barred Galaxies
• Peanuts at an Angle: Detecting and Measuring the Three-Dimensional Structure of Bars in Moderately Inclined Galaxies
• Galactic Bulges from HST NICMOS Observations: central galaxian objects, and nuclear profile slopes
• The Influence of Dark Matter Halos on Dynamical Estimates of Black Hole Mass: Ten New Measurements for High-sigma Early-Type Galaxies
• The Near-infrared S0 Survey III: Morphology of 15 Southern Early-type Disk Galaxies
• The Outer Disks of Early-Type Galaxies. II. Surface-Brightness Profiles of Unbarred Galaxies and Trends with Hubble Type
• The Dynamical Fingerprint of Core Scouring in Massive Elliptical Galaxies
• Gas and stellar dynamics in NGC 1068. Probing the galactic gravitational potential
• When Is a Bulge Not a Bulge? Inner Disks Masquerading as Bulges in NGC 2787 and NGC 3945
• The formation of stellar nuclear discs in bar-induced gas inflows
• Do black hole masses scale with classical bulge luminosities only? The case of the two composite pseudobulge galaxies NGC3368 and NGC3489
• Observational Constraints on Disk Heating as a Function of Hubble Type
• Bars, ovals and lenses in early-type disk galaxies: probes of galaxy evolution
• Fueling AGN-I: How the Global Characteristics of the Central Kiloparsec of Seyferts differ from Quiescent Galaxies
• A Quintet of Black Hole Mass Determinations
• The early-type dwarf galaxy population of the Hydra I cluster
• Kinematic Signatures of Bulges Correlate with Bulge Morphologies and Sérsic Index
• Pseudobulge Formation as a Dynamical Rather than a Secular Process
• The central black hole mass of the high-sigma but low-bulge-luminosity lenticular galaxy NGC 1332
• Dynamical Constraints on The Masses of the Nuclear Star Cluster and Black Hole in the Late-Type Spiral Galaxy NGC 3621
• The HST/ACS Coma Cluster Survey: V - Compact Stellar Systems in the Coma Cluster
• The Stellar Populations in the Central Parsecs of Galactic Bulges Central Stellar Populations
• The supermassive black hole of Fornax A
• Kinematic properties of gas and stars in 20 disc galaxies
• The early-type dwarf galaxy population of the Centaurus cluster
• 2D mapping of young stars in the inner 180 pc of NGC 1068: correlation with molecular gas ring and stellar kinematics
• Triple Bars and Complex Central Structures in Disk Galaxies
• Nuclear bars and blue nuclei within barred spiral galaxies
• Bulges Of Nearby Galaxies With Spitzer: The Growth Of Pseudobulges In Disk Galaxies And Its Connection To Outer Disks
• Natures of a clump-origin bulge: a pseudobulge-like but old metal-rich bulge
• The supermassive black hole in NGC4486a detected with SINFONI at the VLT
• Structure and star formation in disk galaxies I. Sample selection and near infrared imaging
• Constraining the formation of inner bars. Photometry, kinematics and stellar populations in NGC 357
• Distinct stellar populations in the inner bars of double-barred galaxies
• Do Nuclear Star Clusters and Black Holes Follow the Same Host-Galaxy Correlations?
• Resolved Spectroscopy of the Narrow-Line Region in NGC 1068. I. The Nature of the Continuum Emission
• Stellar kinematics in double-barred galaxies: the sigma-hollows
• Formation of young boxy/peanut bulges in ringed barred galaxies
• Early-type galaxies at large galactocentric radii - I. Stellar kinematics and photometric properties
• GMOS IFU observations of the stellar and gaseous kinematics in the centre of NGC 1068

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• The Gaia-ESO Survey: Exploring the complex nature and origins of the Galactic bulge populations
• Black Hole Mass Scaling Relations for Early-Type Galaxies: $M_{BH}$-$M_{\ast ,sph}$ and $M_{BH}$-$M_{\ast ,gal}$
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• The Frequency and Stellar-Mass Dependence of Boxy/Peanut-Shaped Bulges in Barred Galaxies
• On the nature of the barlens component in barred galaxies: what do boxy/peanut bulges look like when viewed face-on?
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• Revealing Hidden Substructures in the $M_{BH}$-$\sigma$ Diagram, and Refining the Bend in the $L$-$\sigma$ Relation
• The role of bars in quenching star formation from z = 3 to the present epoch. Halpha3: an Halpha imaging survey of HI selected galaxies from ALFALFA, VI
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• Formation of S0 galaxies through mergers. Morphological properties: tidal relics, lenses, ovals, and other inner components
• The Black Hole - Bulge Mass Relation in Megamaser Host Galaxies
• An Observational Guide to Identifying Pseudobulges and Classical Bulges in Disk Galaxies
• The Fundamental Relation between Supermassive Black Holes and Their Host Galaxies
• An Optimal Strategy for Accurate Bulge-to-disk Decomposition of Disk Galaxies
• The Milky Way without X: An alternative interpretation of the double red clump in the Galactic bulge
• Bar-induced central star formation as revealed by integral field spectroscopy from CALIFA
• Kinematic decomposition of IllustrisTNG disk galaxies: morphology and relation with morphological structures
• Sculpting Andromeda -- made-to-measure models for M31's bar and composite bulge: dynamics, stellar and dark matter mass
• Observed properties of boxy/peanut/barlens bulges
• SDSS-IV MaNGA: the indispensable role of bars in enhancing the central star formation of low-$z$ galaxies
• Hiding its age: the case for a younger bulge
• The Carnegie-Irvine Galaxy Survey. IX. Classification of Bulge Types and Statistical Properties of Pseudo Bulges
• The build-up of pseudobulges in a hierarchical universe
• The stellar populations of the central region of M31
• Structural and Stellar Population Properties vs. Bulge Types in Sloan Digital Sky Survey Central Galaxies
• Spectro-photometric decomposition of galaxy structural components
• The origin of bulges and discs in the CALIFA survey: I. Morphological evolution
• Novel calibrations of virial black hole mass estimators in active galaxies based on X-ray luminosity and optical/NIR emission lines
• The Demographics of galactic bulges in the SDSS database
• A combined photometric and kinematic recipe for evaluating the nature of bulges using the CALIFA sample
• NGC 5746: formation history of a massive disc-dominated galaxy
• New insight on the origin of the double red clump in the Milky Way bulge
• The Milky Way Bulge: Observed properties and a comparison to external galaxies
• Morpho-kinematic properties of field S0 bulges in the CALIFA survey
• Spin-up of massive classical bulges during secular evolution
• A monolithic collapse origin for the thin/thick disc structure of ESO 243-49
• No evidence for small disk-like bulges in a sample of late-type spirals
• Central enhancement of the nitrogen-to-oxygen abundance ratio in barred galaxies
• Composite Bulges -- II. Classical Bulges and Nuclear Discs in Barred Galaxies: The Contrasting Cases of NGC 4608 and NGC 4643
• On the observational diagnostics to separate classical and disk-like bulges
• Andromeda chained to the Box -- Dynamical Models for M31: Bulge & Bar
• Strong spiral arms drive secular growth of pseudo bulges in disk galaxies
• Deconstructing double-barred galaxies in 2D and 3D. I. Classical nature of the dominant bulges
• The (black hole mass)-(color) relations for early- and late-type galaxies: red and blue sequences
• HERBS I: Metallicity and alpha enhancement along the Galactic bulge minor axis
• The intrinsic shape of bulges in the CALIFA survey
• Complex central structures suggest complex evolutionary paths for barred S0 galaxies
• Reading the tea leaves in the $M_{\mathrm{bh}}$-$M_{\ast ,\mathrm{sph}}$ and $M_{\mathrm{bh}}$-$R_{\mathrm{e},\mathrm{sph}}$ diagrams: dry and gaseous mergers with remnant angular momentum
• The supermassive black hole and double nucleus of the core elliptical NGC5419
• Is the late buckling stage inevitable in the bar life?
• Formation of S0s in extreme environments II: the star-formation histories of bulges, discs and lenses
• The buildup of galaxies and their spheroids: the contributions of mergers, disc instabilities and star formation
• Face-on structure of barlenses and boxy bars: an insight from spectral dynamics
• On the dependence of galaxy morphologies on galaxy mergers
• A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).XII. Ionised gas emission in the inner regions of lenticular galaxies
• Investigating early-type galaxy evolution with a multiwavelength approach. II. The UV structure of 11 galaxies with Swift-UVOT
• High-resolution MEGARA IFU spectroscopy and structural analysis of a fast-rotating, disky bulge in NGC 7025
• Black Hole Growth in Disk Galaxies Mediated by the Secular Evolution of Short Bars
• Kinematic properties of double-barred galaxies: simulations vs. integral-field observations
• Disc galaxies are still settling: The discovery of the smallest nuclear discs and their young stellar bars
• Characterising the Structure of Halo Merger Trees Using a Single Parameter: The Tree Entropy
• Testing a theoretical prediction for bar formation in galaxies with bulges
• The intrinsic three-dimensional shape of galactic bars
• Detailed shapes of the line-of-sight velocity distributions in massive early-type galaxies from non-parametric spectral models
• Red galaxies with pseudo-bulges in the SDSS: closer to disk galaxies or to classical bulges?
• Colors of barlenses: evidence for connecting them to boxy/peanut bulges
• The VIRUS-P Exploration of Nearby Galaxies (VENGA): The stellar populations and assembly of NGC 2903's bulge, bar, and outer disc
• NGC 307 and the Effects of Dark-Matter Haloes on Measuring Supermassive Black Holes in Disc Galaxies
• New X-shaped bulge photometric model as a tool for measuring B/PS bulges and their X-structures in photometric studies
• The physical connection between central stellar surface density and stellar spin in SAMI and MaNGA nearby galaxies
• Blanco DECam Bulge Survey (BDBS) V. Cleaning the foreground populations from Galactic bulge colour-magnitude diagrams using Gaia EDR3
• Multiwavelength Bulge-Disk Decomposition for the Galaxy M81 (NGC 3031). I. Morphology
• Milky Way-like galaxies: stellar population properties of dynamically defined disks, bulges and stellar halos
• The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies
• Pseudo bulges in galaxy groups: the role of environment in secular evolution
• Unravelling stellar populations in the Andromeda Galaxy
• BANG-MaNGA: A census of kinematic discs and bulges across mass and star formation in the local Universe
• Polar-bulge galaxies
• The Complex Structure of the Bulge of M31
• Tailoring galaxies: size-luminosity-surface brightness relations of bulges and disks along the morphological sequence
• Growth of disc-like pseudo-bulges in SDSS DR7 since z = 0.1
• The kinematics of σ-drop bulges from spectral synthesis modelling of a hydrodynamical simulation
• Decomposing galaxies with BANG: an automated morpho-kinematical decomposition of the SDSS-DR17 MaNGA survey
• NGC 7457: Evidence for merger-driven cylindrical rotation in disc galaxies
• A nuclear spiral in a dusty star-forming galaxy at $z=2.78$
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