The SAMI Galaxy Survey: bulge and disk stellar population properties in cluster galaxies

Abstract

We explore stellar population properties separately in the bulge and the disk of double-component cluster galaxies to shed light on the formation of lenticular galaxies in dense environments. We study eight low-redshift clusters from the Sydney-AAO Multi-object Integral field (SAMI) Galaxy Survey, using 2D photometric bulge-disk decomposition in the $g$, $r$ and $i$-bands to characterize galaxies. For 192 double-component galaxies with $M_{\ast }>10^{10}{M}_{\odot }$ we estimate the color, age and metallicity of the bulge and the disk. The analysis of the $g-i$ colors reveals that bulges are redder than their surrounding disks with a median offset of 0.12$\pm$0.02 mag, consistent with previous results. To measure mass-weighted age and metallicity we investigate three methods: (i) one based on galaxy stellar mass weights for the two components, (ii) one based on flux weights and (iii) one based on radial separation. The three methods agree in finding 62% of galaxies having bulges that are 2-3 times more metal-rich than the disks. Of the remaining galaxies, 7% have bulges that are more metal-poor than the disks, while for 31% the bulge and disk metallicities are not significantly different. We observe 23% of galaxies being characterized by bulges older and 34% by bulges younger with respect to the disks. The remaining 43% of galaxies have bulges and disks with statistically indistinguishable ages. Redder bulges tend to be more metal-rich than the disks, suggesting that the redder color in bulges is due to their enhanced metallicity relative to the disks instead of differences in stellar population age.

38 pages (including 5 pages of appendices), 23 Figures, 5 Tables. Accepted for publication in ApJ

References in corpus (29)

• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• The SAMI Galaxy Survey: instrument specification and target selection
• The Atlas3D Project - XXX. Star formation histories and stellar population scaling relations of early-type galaxies
• Evidence for Mature Bulges and an Inside-out Quenching Phase 3 Billion Years After the Big Bang
• A Wide-field Survey of Two Z~0.5 Galaxy Clusters: Identifying the Physical Processes Responsible for the Observed Transformation of Spirals into S0s
• The SAMI Galaxy Survey: the link between angular momentum and optical morphology
• The SAMI Galaxy Survey: Revisiting Galaxy Classification Through High-Order Stellar Kinematics
• The SAMI Galaxy Survey: Early Data Release
• ProFit: Bayesian Profile Fitting of Galaxy Images
• The SAMI Galaxy Survey: Cubism and covariance, putting round pegs into square holes
• The Tully-Fisher relation for S0 galaxies
• The SAMI Galaxy Survey: Global stellar populations on the size-mass plane
• The SAMI Galaxy Survey: Quenching of star formation in clusters I. Transition galaxies
• The SAMI Galaxy Survey: Data Release One with Emission-line Physics Value-Added Products
• The SAMI Galaxy Survey: Revising the Fraction of Slow Rotators in IFS Galaxy Surveys
• The Origin of S0s in Clusters: evidence from the bulge and disc star formation histories
• Combining Stellar Populations with Orbit-Superposition Dynamical Modelling - the Formation History of the Lenticular Galaxy NGC 3115
• SDSS-IV MaNGA: Bulge-Disc Decomposition of IFU Datacubes (BUDDI)
• Formation of S0 galaxies through mergers. Evolution in the Tully-Fisher relation since $z\sim 1$
• The SAMI Galaxy Survey: Decomposed Stellar Kinematics of Galaxy Bulges and Disks
• SDSS IV MaNGA: Full spectroscopic bulge-disc decomposition of MaNGA early-type galaxies
• Spectro-photometric decomposition of galaxy structural components
• Star-formation in CALIFA early-type galaxies. A matter of discs
• Formation of S0s in extreme environments I: clues from kinematics and stellar populations
• Indications of the invalidity of the exponentiality of the disk within bulges of spiral galaxies
• Angular Momentum across the Hubble sequence from the CALIFA survey

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• The SAMI Galaxy Survey: flipping of the spin-filament alignment correlates most strongly with growth of the bulge
• ProFuse: Physical Multi-Band Structural Decomposition of Galaxies and the Mass-Size-Age Plane
• BUDDI-MaNGA II: The Star-Formation Histories of Bulges and Discs of S0s
• The colors of bulges and disks in the core and outskirts of galaxy clusters
• Inside-out star formation quenching and the need for a revision of bulge-disk decomposition concepts for spiral galaxies
• Bulgeless disks, dark galaxies, inverted color gradients, and other expected phenomena at higher z. The chromatic surface brightness modulation (CMOD) effect
• The age gradients of galaxies in EAGLE: outside-in quenching as the origin of young bulges in cluster galaxies
• Comparison of the Stellar Populations of Bulges and Discs using the MaNGA Survey
• BUDDI-MaNGA I: A statistical sample of cleanly decomposed bulge and disc spectra