SDSS-IV MaNGA: Radial Gradients in Stellar Population Properties of Early-Type and Late-Type Galaxies

Abstract

We derive ages, metallicities, and individual element abundances of early- and late-type galaxies (ETGs and LTGs) out to 1.5 R${}_e$. We study a large sample of 1900 galaxies spanning $8.6-11.3\log M/M_{\odot }$ in stellar mass, through key absorption features in stacked spectra from the SDSS-IV/MaNGA survey. We use mock galaxy spectra with extended star formation histories to validate our method for LTGs and use corrections to convert the derived ages into luminosity- and mass-weighted quantities. We find flat age and negative metallicity gradients for ETGs and negative age and negative metallicity gradients for LTGs. Age gradients in LTGs steepen with increasing galaxy mass, from $-0.05\pm 0.11\log$ Gyr/R${}_e$ for the lowest mass galaxies to $-0.82\pm 0.08\log$ Gyr/R${}_e$ for the highest mass ones. This strong gradient-mass relation has a slope of $-0.70\pm 0.18$. Comparing local age and metallicity gradients with the velocity dispersion $\sigma$ within galaxies against the global relation with $\sigma$ shows that internal processes regulate metallicity in ETGs but not age, and vice versa for LTGs. We further find that metallicity gradients with respect to local $\sigma$ show a much stronger dependence on galaxy mass than radial metallicity gradients. Both galaxy types display flat [C/Fe] and [Mg/Fe], and negative [Na/Fe] gradients, whereas only LTGs display gradients in [Ca/Fe] and [Ti/Fe]. ETGs have increasingly steep [Na/Fe] gradients with local $\sigma$ reaching $6.50\pm 0.78$ dex/$\log$ km/s for the highest masses. [Na/Fe] ratios are correlated with metallicity for both galaxy types across the entire mass range in our sample, providing support for metallicity dependent supernova yields.

21 pages, 21 figures, 4 tables + Appendix

References in corpus (36)

• The NumPy array: a structure for efficient numerical computation
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Galactic chemical evolution: Carbon through Zinc
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• Two Stellar Components in the Halo of the Milky Way
• A systematic variation of the stellar initial mass function in early-type galaxies
• The MaNGA Integral Field Unit Fiber Feed System for the Sloan 2.5 m Telescope
• Ages and metallicities of early-type galaxies in the SDSS: new insight into the physical origin of the colour-magnitude and the Mg2-sigmaV relations
• The SDSS-IV MaNGA Sample: Design, Optimization, and Usage Considerations
• Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
• SDSS-IV MaNGA IFS Galaxy Survey --- Survey Design, Execution, and Initial Data Quality
• Population Synthesis in the Blue IV: Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations
• Stellar Population gradients in galaxy discs from the CALIFA survey
• SDSS-IV MaNGA: Spatially resolved star formation histories in galaxies as a function of galaxy mass and type
• Radial variations in the stellar initial mass function of early-type galaxies
• Firefly (Fitting IteRativEly For Likelihood analYsis): a full spectral fitting code
• The SAMI Galaxy Survey: the link between angular momentum and optical morphology
• On the interpretation of age and chemical composition of composite stellar populations determined with line-strength indices
• Measuring Ages and Elemental Abundances from Unresolved Stellar Populations: Fe, Mg, C, N, and Ca
• SDSS-IV MaNGA: environmental dependence of stellar age and metallicity gradients in nearby galaxies
• Ages and Abundances of Red Sequence Galaxies as a Function of LINER Emission Line Strength
• The SAURON project - XI. Stellar Populations from Absorption Line Strength Maps of 24 Early-Type Spirals
• The SINFONI Nearby Elliptical Lens Locator Survey: Discovery of two new low-redshift strong lenses and implications for the initial mass function in giant early-type galaxies
• The star formation history of early-type galaxies as a function of mass and environment
• The SAMI Galaxy Survey: Global stellar populations on the size-mass plane
• IMF shape constraints from stellar populations and dynamics from CALIFA
• IMF and [Na/Fe] abundance ratios from optical and NIR Spectral Features in Early-type Galaxies
• Absorption line-strengths of 18 late-type spiral galaxies observed with SAURON
• The information content of stellar halos: Stellar population gradients and accretion histories in early-type Illustris galaxies
• Probing recent star formation with absorption-line strengths in hierarchical models and observations
• Line Strengths in Early-Type Cluster Galaxies at z=0.33: Implications for alpha/Fe, Nitrogen and the Histories of E/S0s
• The MASSIVE Survey - XII Connecting Stellar Populations of Early-Type Galaxies to Kinematics and Environment
• SDSS IV MaNGA: Full spectroscopic bulge-disc decomposition of MaNGA early-type galaxies
• Milky Way Analogues in MaNGA: Multi-Parameter Homogeneity and Comparison to the Milky Way

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• MaNGA DynPop -- III. Stellar dynamics versus stellar population relations in 6000 early-type and spiral galaxies: Fundamental Plane, mass-to-light ratios, total density slopes, and dark matter fractions
• From Carbon to Cobalt: Chemical compositions and ages of $z\sim 0.7$ quiescent galaxies
• Galaxy Zoo: 3D -- Crowd-sourced Bar, Spiral and Foreground Star Masks for MaNGA Target Galaxies
• Star Formation and AGN Feedback in the Local Universe: Combining LOFAR and MaNGA
• Mass Metallicity Relationship of SDSS Star Forming Galaxies: Population Synthesis Analysis and Effects of Star Burst Length, Extinction Law, Initial Mass Function and Star Formation Rate
• The CAVITY project. The spatially resolved stellar population properties of galaxies in voids
• Colour gradients of low-redshift galaxies in the DESI Legacy Imaging Survey
• The evolution of radial gradients of MaNGA quiescent elliptical galaxies: inside-out quenching or outer mass growth?
• Core-collapse Supernovae in the Dark Energy Survey: Luminosity Functions and Host Galaxy Demographics
• Age and metal gradients in massive quiescent galaxies at $0.6\lesssim z\lesssim 1.0$: implications for quenching and assembly histories
• Ages and metallicities of quiescent galaxies: confronting broadband ($UVJ$) colours with stellar absorption lines
• Recovery of the low- and high-mass end slopes of the IMF in massive early-type galaxies using detailed elemental abundances
• Comparison of the Stellar Populations of Bulges and Discs using the MaNGA Survey
• The Origin of Star Formation in Early-type Galaxies Inferred from Spatially Resolved Spectroscopy
• Spatially resolved self-consistent spectral modelling of jellyfish galaxies from MUSE with FADO: trends with mass and stripping intensity
• On the Use of Field RR Lyrae as Galactic Probes -- VIII. Early Formation of the Galactic Spheroid
• The diverse quenching pathways of post-starburst galaxies in SDSS-IV MaNGA
• The Impact of Bars, Spirals and Bulge-Size on Gas-Phase Metallicity Gradients in MaNGA Galaxies
• The link between galaxy structure properties and star formation in local galaxies
• Comparing the structural parameters of the Milky Way to other spiral galaxies
• A FUV-optical approach for studying hierarchical star formation in nearby galaxies with UVIT
• Growing in number, passive in nature: tracing the evolution of the most massive quiescent galaxies since z ~ 0.8 with BOSS and DESI
• Stellar Abundances at the Center of Early Type Galaxies with Fine Structure
• Structural evolution of quiescent galaxies at intermediate redshifts at UV and red rest-frame wavelengths
• A MaNGA about the Legacy I: Connecting the Assembly of Stellar Halo with the Average Star Formation History in Low-Redshift Massive Galaxies
• Cosmography via stellar archaeology of low-redshift early-type galaxies from SDSS
• The miniJPAS survey: Dissecting galaxy properties across environments with spatially resolved photometry
• Investigating the young stellar populations and hierarchies in nearby galaxies with the UVIT. II. Presenting the properties of ~25,000 UV-detected star-forming clumps
• Fornax 3D project: assessing the diversity of IMF and stellar population maps within the Fornax Cluster
• SDSS-IV MaNGA: How the stellar populations of passive central galaxies depend on stellar and halo mass