Mid and Far-Infrared Color-Color Relations within Local Galaxies

Abstract

We present an extensive archival analysis of a sample of local galaxies, combining multi-wavelength data from GALEX, Spitzer and Herschel to investigate "blue-side" mid-infrared (MIR) and "red-side" far-infrared (FIR) color-color correlations within the observed infrared spectral energy distributions (IR SEDs). Our sample largely consists of the KINGFISH galaxies, with the important addition of a select few including NGC5236 (M83) and NGC4449. With data from the far-ultraviolet FUV ($\sim 0.15$ $\mu$m) through 500 $\mu$m convolved to common angular resolution, we measure photometry of $kpc$-scale star-forming regions 36$"\times$36$"$ in size. Star formation rates (SFRs), stellar masses and metallicity distributions are derived throughout our sample. Focusing on the $f_{70}/f_{500}$ "FIR" and $f_8/f_{24}$ "MIR" flux density ratios (colors), we find that a sub-sample of galaxies demonstrate a strong IR color-color correlation within their star-forming regions, while others demonstrate uncorrelated colors. This division is driven by two main effects: 1) the local strength of star formation (SF) and 2) the metal content of the interstellar medium (ISM). Galaxies uniformly dominated by high surface densities of SF (e.g. NGC5236) demonstrate strong IR color-color correlations, while galaxies that exhibit lower levels of SF and mixed environments (e.g. NGC5457) demonstrate weaker or no correlation--explained by the increasing effect of varying ISM heating and metal content on the IR colors, specifically in the MIR. We find large dispersion in the SFR-$L_8$ (8 $\mu$m luminosity) relation that is traced by the metallicity distributions, consistent with extant studies, highlighting its problematic use as a SFR indicator across diverse systems/samples.

26 pages, 11 figures

References in corpus (19)

• Cosmic Star Formation History
• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• HyperLEDA. III. The catalogue of extragalactic distances
• The GALEX Ultraviolet Atlas of Nearby Galaxies
• High-resolution dark matter density profiles of THINGS dwarf galaxies: Correcting for non-circular motions
• The Behavior of the Aromatic Features in M101 HII Regions: Evidence for Dust Processing
• Color--Mass-to-Light Ratio Relations for Disk Galaxies
• ALMA Observations of the Antennae Galaxies: I. A New Window on a Prototypical Merger
• Modeling Dust and Starlight in Galaxies Observed by Spitzer and Herschel: The KINGFISH Sample
• Spitzer Local Volume Legacy (LVL) SEDs and Physical Properties
• Star formation efficiency in the Barred Spiral Galaxy NGC 4303
• The MOSDEF Survey: Metallicity Dependence of the PAH Emission at High Redshift and Implications for 24 micron-inferred IR Luminosities and Star Formation Rates at z~2
• Star-formation rates from young-star counts and the structure of the ISM across the NGC346/N66 complex in the SMC
• Star Formation Rates in Resolved Galaxies: Calibrations with Near and Far Infrared Data for NGC5055 and NGC6946
• Spatially Resolved Dust, Gas, and Star Formation in the Dwarf Magellanic Irregular NGC4449
• Quantifying the Heating Sources for Mid-infrared Dust Emissions in Galaxies: The Case of M 81
• Metallicities of Young Massive Clusters in NGC 5236 (M83)
• Star-Forming Environments Throughout the M101 Group
• The Age-Dependence of Mid-Infrared Emission Around Young Star Clusters

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• SFR estimations from z=0 to z=0.9 -- A comparison of SFR calibrators for star-forming galaxies
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• The ISM scaling relations using inner HI and an application of estimating dust mass