The half mass radius of MaNGA galaxies: Effect of IMF gradients

Abstract

Gradients in the stellar populations (SP) of galaxies -- e.g., in age, metallicity, stellar Initial Mass Function (IMF) -- can result in gradients in the stellar mass to light ratio, $M_{\ast }/L$. Such gradients imply that the distribution of the stellar mass and light are different. For old SPs, e.g., in early-type galaxies at $z\sim 0$, the $M_{\ast }/L$ gradients are weak if driven by variations in age and metallicity, but significantly larger if driven by the IMF. A gradient which has larger $M_{\ast }/L$ in the center increases the estimated total stellar mass ($M_{\ast }$) and reduces the scale which contains half this mass ($R_{e,\ast }$), compared to when the gradient is ignored. For the IMF gradients inferred from fitting MILES simple SP models to the H${}_{\beta }$, $⟨$Fe$⟩$, [MgFe] and TiO${}_{2SDSS}$ absorption lines measured in spatially resolved spectra of early-type galaxies in the MaNGA survey, the fractional change in $R_{e,\ast }$ can be significantly larger than that in $M_{\ast }$, especially when the light is more centrally concentrated. The $R_{e,\ast }-M_{\ast }$ correlation which results is offset by 0.3 dex to smaller sizes compared to when these gradients are ignored. Comparisons with `quiescent' galaxies at higher-$z$ must account for evolution in SP gradients (especially age and IMF) and the light profile before drawing conclusions about how $R_{e,\ast }$ and $M_{\ast }$ evolve. The implied merging between higher-$z$ and the present is less contrived if $R_{e,\ast }/R_e$ at $z\sim 0$ is closer to our IMF-driven gradient calibration than to unity.

arXiv comment16 pages, 15 figures, accepted for publication in MNRAS

References in corpus (76)

• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• 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
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• The size distribution of galaxies in the Sloan Digital Sky Survey
• The Multi-Object, Fiber-Fed Spectrographs for SDSS and the Baryon Oscillation Spectroscopic Survey
• Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field
• The Growth of Massive Galaxies Since z=2
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• Confirmation of the remarkable compactness of massive quiescent galaxies at z~2.3: early-type galaxies did not form in a simple monolithic collapse
• The Atlas3D project - XV. Benchmark for early-type galaxies scaling relations from 260 dynamical models: mass-to-light ratio, dark matter, Fundamental Plane and Mass Plane
• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• The MaNGA Integral Field Unit Fiber Feed System for the Sloan 2.5 m Telescope
• The Data Reduction Pipeline for the SDSS-IV MaNGA IFU Galaxy Survey
• Size evolution of the most massive galaxies at 1.7<z<3 from GOODS NICMOS survey imaging
• A unified multi-wavelength model of galaxy formation
• A new chemo-evolutionary population synthesis model for early-type galaxies. I: Theoretical basis
• 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
• The Data Analysis Pipeline for the SDSS-IV MaNGA IFU Galaxy Survey: Overview
• The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA Derived Quantities, Data Visualization Tools and Stellar Library
• Early-type galaxies in the SDSS. II. Correlations between observables
• The Fundamenal Plane in CL0024 at z=0.4: Implications for the Evolution of the Mass-to-Light Ratio
• SPIDER VIII - Constraints on the Stellar Initial Mass Function of Early-type Galaxies from a Variety of Spectral Features
• SDSS-IV/MaNGA: Spectrophotometric Calibration Technique
• How do minor mergers promote inside-out growth of ellipticals, transforming the size, density profile and dark matter fraction?
• Spatially resolved spectroscopy of Coma cluster early -- type galaxies: III. The stellar population gradients
• A universal structural and star-forming relation since $z\sim 3$: connecting compact star-forming and quiescent galaxies
• Where stars form: inside-out growth and coherent star formation from HST Halpha maps of 2676 galaxies across the main sequence at z~1
• A catalog of bulge, disk, and total stellar mass estimates for the Sloan Digital Sky Survey
• Discriminating Between the Physical Processes that Drive Spheroid Size Evolution
• COSMOS-DASH: The Evolution of the Galaxy Size-Mass Relation Since z~3 from new Wide Field WFC3 Imaging Combined with CANDELS/3DHST
• Radial variations in the stellar initial mass function of early-type galaxies
• The Stellar Initial Mass Function in Early-Type Galaxies from Absorption Line Spectroscopy. III. Radial Gradients
• The impact of the metallicity and star formation rate on the time-dependent galaxy-wide stellar initial mass function
• Galaxy luminosities, stellar masses, sizes, velocity dispersions as a function of morphological type
• On the Size and Comoving Mass Density Evolution of Early-Type Galaxies
• SDSS-IV MaNGA: Stellar angular momentum of about 2300 galaxies: unveiling the bimodality of massive galaxy properties
• Size Evolution of Spheroids in a Hierarchical Universe
• Half-mass radii for ~7,000 galaxies at 1.0 < z < 2.5: most of the evolution in the mass-size relation is due to color gradients
• SDSS-IV MaNGA: Global stellar population and gradients for about 2000 early-type and spiral galaxies on the mass-size plane
• SDSS-IV MaNGA: The Spatially Resolved Stellar Initial Mass Function in $\sim$400 Early-Type Galaxies
• The mass-metallicity gradient relation of early-type galaxies
• SDSS-IV DR17: Final Release of MaNGA PyMorph Photometric and Deep Learning Morphological Catalogs
• The stellar mass structure of massive galaxies from z=0 to z=2.5; surface density profiles and half-mass radii
• The stellar accretion origin of stellar population gradients in massive galaxies at large radii
• SDSS-IV MaNGA PyMorph Photometric and Deep Learning Morphological Catalogs and implications for bulge properties and stellar angular momentum
• Radial constraints on the Initial Mass Function from TiO features and Wing-Ford band in Early-type Galaxies
• Timing the formation and assembly of early-type galaxies via spatially resolved stellar populations analysis
• SDSS-IV MaNGA: variation of the stellar initial mass function in spiral and early-type galaxies
• The BaSTI Stellar Evolution Database: models for extremely metal-poor and super-metal-rich stellar populations
• IMF and [Na/Fe] abundance ratios from optical and NIR Spectral Features in Early-type Galaxies
• Avoiding progenitor bias: The structural and mass evolution of Brightest Group and Cluster Galaxies in Hierarchical models since z~1
• IMF radial gradients in most massive early-type galaxies
• The Origin of Color Gradients in Early-Type Systems and Their Compactness at High-z
• Sizes, Colour gradients and Resolved Stellar Mass Distributions for the Massive Cluster Galaxies in XMMUJ2235-2557 at z = 1.39
• Stellar mass-to-light ratio gradients in galaxies: correlations with mass
• Spatially resolved mass-to-light from the CALIFA survey. Mass-to-light ratio vs. color relations
• Galaxy properties as revealed by MaNGA. I. Constraints on Initial Mass Function and M${}_{\ast }$/L gradients in ellipticals
• Galaxy And Mass Assembly (GAMA): the wavelength dependence of galaxy structure versus redshift and luminosity
• The stellar population and initial mass function of NGC 1399 with MUSE
• The kinematics of massive quiescent galaxies at $1.4<z<2.1$: dark matter fractions, IMF variation, and the relation to local early-type galaxies
• The SAMI Galaxy Survey: stellar population gradients of central galaxies
• Galaxy properties as revealed by MaNGA II. Differences in stellar populations of slow and fast rotator ellipticals and dependence on environment
• The Fundamental Plane in the LEGA-C Survey: unraveling the $M/L$ variations of massive star-forming and quiescent galaxies at $z\sim 0.8$
• Galaxy properties as revealed by MaNGA. III. Kinematic profiles and stellar population gradients in S0s
• $M_{\ast }/L$ gradients driven by IMF variation: Large impact on dynamical stellar mass estimates
• SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies
• The Stellar Mass Fundamental Plane: The virial relation and a very thin plane for slow-rotators
• Calibrated, cosmological hydrodynamical simulations with variable IMFs III: Spatially-resolved properties and evolution
• The evolution of compact massive quiescent and starforming galaxies derived from the $R_e-R_h$ and $M_{\mathrm{star}}-M_h$ relations
• Revisiting the bulge-halo conspiracy II: Towards explaining its puzzling dependence on redshift
• Wolf-Rayet galaxies in SDSS-IV MaNGA. II. Metallicity dependence of the high-mass slope of the stellar initial mass function
• When did the initial mass function become bottom-heavy?

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