The physical connection between central stellar surface density and stellar spin in SAMI and MaNGA nearby galaxies

Abstract

The stellar surface density within the inner 1 kpc (${\Sigma }_1$) has become a popular tool for understanding the growth of galaxies and its connection with the quenching of star formation. The emerging picture suggests that building a central dense core is a necessary condition for quenching. However, it is not clear whether changes in ${\Sigma }_1$ trace changes in stellar kinematics and the growth of dispersion-dominated bulges. In this paper, we combine imaging from the Sloan Digital Sky Survey with stellar kinematics from the Sydney-AAO Multi-object Integral-field unit (SAMI) and Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) surveys to quantify the correlation between ${\Sigma }_1$ and the proxy for stellar spin parameter within one effective radius (${\lambda }_{re}$) for 1599 nearby galaxies. We show that, on the star-forming main sequence and at fixed stellar mass, changes in ${\Sigma }_1$ are mirrored by changes in ${\lambda }_{re}$. While forming stars, main sequence galaxies remain rotationally-dominated systems, with their ${\Sigma }_1$ increasing but their stellar spin staying either constant or slightly increasing. The picture changes below the main sequence, where ${\Sigma }_1$ and ${\lambda }_{re}$ are no longer correlated. Passive systems show a narrower range of ${\Sigma }_1$, but a wider range of ${\lambda }_{re}$ compared to star-forming galaxies. Our results indicate that, from a structural point of view, passive galaxies are a more heterogeneous population than star-forming systems, and may have followed a variety of evolutionary paths. This also suggests that, if dispersion-dominated bulges still grow significantly at $z\sim$0, this generally takes place during, or after, the quenching phase.

12 pages, 7 figures, 1 table. MNRAS in press

References in corpus (35)

• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• Compaction and Quenching of High-z Galaxies in Cosmological Simulations: Blue and Red Nuggets
• The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time
• The SAMI Galaxy Survey: instrument specification and target selection
• GALEX-SDSS-WISE Legacy Catalog (GSWLC): Star Formation Rates, Stellar Masses and Dust Attenuations of 700,000 Low-redshift Galaxies
• Evidence for Mature Bulges and an Inside-out Quenching Phase 3 Billion Years After the Big Bang
• A catalogue of 2D photometric decompositions in the SDSS-DR7 spectroscopic main galaxy sample: preferred models and systematics
• Morphology and star formation in IllustrisTNG: the build-up of spheroids and discs
• The SAMI Galaxy Survey: the link between angular momentum and optical morphology
• The SAMI Galaxy Survey: Revisiting Galaxy Classification Through High-Order Stellar Kinematics
• Composite Bulges: The Coexistence of Classical Bulges and Disky Pseudobulges in S0 and Spiral Galaxies
• Dissecting the Red Sequence--I. Star Formation Histories of Quiescent Galaxies: The Color-Magnitude vs. the Color-Sigma Relation
• Dense cores in galaxies out to z=2.5 in SDSS, UltraVISTA, and the five 3D-HST/CANDELS fields
• Predicting Quiescence: The Dependence of Specific Star Formation Rate on Galaxy Size and Central Density at 0.5<z<2.5
• Two Conditions for Galaxy Quenching: Compact Centres and Massive Haloes
• Galaxy And Mass Assembly (GAMA): ${\mathcal{M}}_{\star }-R_{\mathrm{e}}$ relations of $z=0$ bulges, discs and spheroids
• The SAMI Galaxy Survey: the third and final data release
• Orbital decomposition of CALIFA spiral galaxies
• Connection Between Stellar Mass Distributions Within Galaxies and Quenching Since z =2
• xGASS: Cold gas content and quenching in galaxies below the star forming main sequence
• The CALIFA view on stellar angular momentum across the Hubble sequence
• Recovering ${\lambda }_R$ and $V/\sigma$ from seeing-dominated IFS data
• The SAMI Galaxy Survey: Decomposed Stellar Kinematics of Galaxy Bulges and Disks
• Bulges and disks in the local Universe. Linking the galaxy structure to star formation activity
• The SAMI Galaxy Survey: Satellite galaxies undergo little structural change during their quenching phase
• Satellite Quenching, Galaxy Inner Density and the Halo Environment
• SDSS IV MaNGA: Full spectroscopic bulge-disc decomposition of MaNGA early-type galaxies
• The SAMI Galaxy Survey: Mass and Environment as Independent Drivers of Galaxy Dynamics
• xGASS: The Impact of Photometric Bulges on the Scatter of HI Scaling Relations
• A SAMI and MaNGA view on the stellar kinematics of galaxies on the star-forming main sequence
• The SAMI Galaxy Survey: The role of disc fading and progenitor bias in kinematic transitions
• Larger ${\lambda }_R$ in the disc of isolated active spiral galaxies than in their non-active twins
• The Structural Evolution of Isolated Galaxies at Low Redshift in the IllustrisTNG Simulation
• The SAMI Galaxy Survey: The contribution of different kinematic classes to the stellar mass function of nearby galaxies