Galaxy Structure in the Ultraviolet: The Dependence of Morphological Parameters on Rest-Frame Wavelength

Abstract

Evolutionary studies that compare galaxy structure as a function of redshift are complicated by the fact that any particular galaxy's appearance depends in part on the rest-frame wavelength of the observation. This leads to the necessity for a "morphological k-correction" between different pass-bands, especially when comparing the rest-frame optical or infrared (IR) to the ultraviolet (UV). This is of particular concern for high redshift studies that are conducted in the rest-frame UV. We investigate the effects of this "band-pass shifting" out of the UV by quantifying nearby galaxy structure via "CAS parameters" (concentration, asymmetry, and clumpiness). For this study we combine pan-chromatic data from the UV through the near-IR with GALEX (Galaxy Evolution Explorer) data of 2073 nearby galaxies in the "NUV" (~230 nm) and 1127 in the "FUV" (~150 nm), providing the largest study of this kind in the mid- to far-UV. We find a relationship between the CAS parameters and observed rest-frame wavelength that make galaxies appear more late-type at shorter wavelengths, particularly in the UV. The effect is strongest for E/S0 galaxies in the far-UV, which have concentrations and asymmetries that more resemble those of spiral and peculiar/merging galaxies in the optical. This may be explained by extended disks containing recent star formation. Here we also release the CAS values of the galaxies imaged in GALEX NUV and FUV for use in comparisons with deep HST imaging and JWST in the future.

arXiv commentAccepted for publication in the Astrophysical Journal. 13 pages plus 7 pages of tables and figures (3 tables, 5 figures)

References in corpus (26)

• The Relationship Between Stellar Light Distributions of Galaxies and their Formation Histories
• The Asymmetry of Galaxies: Physical Morphology for Nearby and High Redshift Galaxies
• Structural and Photometric Classification of Galaxies - I. Calibration Based on a Nearby Galaxy Sample
• The Hubble Space Telescope Wide Field Camera 3 Early Release Science data: Panchromatic Faint Object Counts for 0.2-2 microns wavelength
• Far-Ultraviolet Radiation from Elliptical Galaxies
• The Luminosity, Stellar Mass, and Number Density Evolution of Field Galaxies of Known Morphology from z = 0.5 - 3
• The Fundamental Properties of Galaxies and a New Galaxy Classification System
• The effect of environment on the UV colour-magnitude relation of early-type galaxies
• The morphological mix of field galaxies to I=24.25 magnitudes (b=26 magnitudes) from a deep Hubble Space Telescope WFPC2 image
• The Redshift and Mass Dependence on the Formation of The Hubble Sequence at z>1 from CANDELS/UDS
• The Hubble Sequence beyond z=2 for Massive Galaxies: Contrasting Large Star-Forming and Compact Quiescent Galaxies
• MegaMorph -- multi-wavelength measurement of galaxy structure: Sérsic profile fits to galaxies near and far
• An HST Survey of the mid-UV Morphology of Nearby Galaxies
• How was the Hubble sequence 6 Gyrs ago?
• Comparing Galaxy Morphology at Ultraviolet and Optical Wavelengths
• Major Merging History in CANDELS. I. Evolution of the Incidence of Massive Galaxy-Galaxy Pairs from z=3 to z~0
• Dependence of Galaxy Structure on Rest-frame Wavelength and Galaxy Type
• Galaxy Number Counts in the Subaru Deep Field: Multi-band Analysis in a Hierarchical Galaxy Formation Model
• Quantitative Morphology of Galaxies Observed in the Ultraviolet
• Quantified H i Morphology VII: The Morphology of Extended Disks in UV and H i
• Star formation associated with neutral hydrogen in the outskirts of early-type galaxies
• Ultraviolet Halos Around Spiral Galaxies. I. Morphology
• UV-bright nearby early type galaxies observed in the mid-infrared: evidence for a multi-stage formation history by way of WISE and GALEX imaging
• Revealing the nature of star forming blue early-type galaxies at low redshift
• High resolution science with high redshift galaxies
• A Panchromatic Catalog of Early-Type Galaxies at Intermediate Redshift in the Hubble Space Telescope Wide Field Camera 3 Early Release Science Field

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• JWST's PEARLS: Prime Extragalactic Areas for Reionization and Lensing Science: Project Overview and First Results
• Panic! At the Disks: First Rest-frame Optical Observations of Galaxy Structure at $z>3$ with JWST in the SMACS 0723 Field
• EPOCHS VI: The Size and Shape Evolution of Galaxies since z ~ 8 with JWST Observations
• Early results from GLASS-JWST XIV: A first morphological atlas of the 1 < z < 5 Universe in the rest-frame optical
• Unbiased Differential Size Evolution and the Inside-Out Growth of Galaxies in the Deep CANDELS GOODS Fields at $1\le z\le 7$
• Fraction of Clumpy Star-Forming Galaxies at $0.5\le z\le 3$ in UVCANDELS: Dependence on Stellar Mass and Environment
• Observing the host galaxies of high-redshift quasars with JWST: predictions from the BlueTides simulation
• Eigengalaxies: describing galaxy morphology using principal components in image space
• Deep Extragalactic VIsible Legacy Survey (DEVILS): Stellar Mass Growth by Morphological Type since $z=1$
• Multiwavelength Bulge-Disk Decomposition for the Galaxy M81 (NGC 3031). I. Morphology
• UV-Bright Star-Forming Clumps and Their Host Galaxies in UVCANDELS at 0.5 $\le$ z $\le$ 1
• Super-massive black hole wake or bulgeless edge-on galaxy?
• Evolution of 3-dimensional Shape of Passively Evolving and Star-forming Galaxies at $z<1$
• The Ly$\alpha$ and Continuum Origins Survey. III. Investigating the Link between Galaxy Morphology, Merger Properties and LyC Escape
• How the spectral energy distribution and galaxy morphology constrain each other, with application to morphological selection using galaxy colours
• Quantitative analysis of the molecular gas morphology in nearby disk galaxies
• A Simulation Driven Deep Learning Approach for Separating Mergers and Star Forming Galaxies: The Formation Histories of Clumpy Galaxies in all the CANDELS Fields