Improved Measurements of Galaxy Star Formation Stochasticity from the Intrinsic Scatter of Burst Indicators

Abstract

Measurements of short-timescale star formation variations (i.e., "burstiness") are integral to our understanding of star formation feedback mechanisms and the assembly of stellar populations in galaxies. We expand upon the work of Broussard et al. (2019) by introducing a new analysis of galaxy star formation burstiness that accounts for variations in the $Q_{sg}=\mathrm{E}(\mathrm{B}-\mathrm{V}{)}_{\mathrm{stars}}/\mathrm{E}(\mathrm{B}-\mathrm{V}{)}_{\mathrm{gas}}$ distribution, a major confounding factor. We use Balmer decrements from the MOSFIRE Deep Evolution Field (MOSDEF) survey to measure $Q_{sg}$, which we use to construct mock catalogs from the Santa Cruz Semi-Analytic Models and Mufasa cosmological hydrodynamical simulation based on 3D-HST, Fiber Multi-Object Spectrograph (FMOS)-COSMOS, and MOSDEF galaxies with H$\alpha$ detections. The results of the mock catalogs are compared against observations using the burst indicator $\eta ={\log }_{10}(\mathrm{SF}{\mathrm{R}}_{\mathrm{H}\alpha }/SF{\mathrm{R}}_{\mathrm{NUV}})$, with the standard deviation of the $\eta$ distribution indicating burstiness. We find decent agreement between mock and observed $\eta$ distribution shapes; however, the FMOS-COSMOS and MOSDEF mocks show a systematically low median and scatter in $\eta$ in comparison to the observations. This work also presents the novel approach of analytically deriving the relationship between the intrinsic scatter in $\eta$, scatter added by measurement uncertainties, and observed scatter, resulting in an intrinsic burstiness measurement of $0.06-0.16$ dex.

arXiv comment17 pages, 6 Figures, 3 Tables; Submitted to ApJ

References in corpus (66)

• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Star Formation in the Milky Way and Nearby Galaxies
• The Cosmic Evolution Survey (COSMOS) -- Overview
• Simulating Galaxy Formation with the IllustrisTNG Model
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• The Great Observatories Origins Deep Survey: Initial Results From Optical and Near-Infrared Imaging
• UV Star Formation Rates in the Local Universe
• Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• Simulating galaxy formation with black hole driven thermal and kinetic feedback
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• The propagation of uncertainties in stellar population synthesis modeling III: model calibration, comparison, and evaluation
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Galactic disk mass function: reconciliation of the HST and nearby determinations
• 3D-HST: A wide-field grism spectroscopic survey with the Hubble Space Telescope
• A new photometric technique for the joint selection of star-forming and passive galaxies at 1.4<z<2.5
• The All-wavelength Extended Groth Strip International Survey (AEGIS) Data Sets
• The Star Formation Histories of Local Group Dwarf Galaxies I. Hubble Space Telescope / Wide Field Planetary Camera 2 Observations
• The MOSFIRE Deep Evolution Field (MOSDEF) Survey: Rest-Frame Optical Spectroscopy for ~1500 H-Selected Galaxies at 1.37 < z < 3.8
• Nebular Continuum and Line Emission in Stellar Population Synthesis Models
• On Star Formation Rates and Star Formation Histories of Galaxies out to z ~ 3
• H-alpha Observations of a Large Sample of Galaxies at z~2: Implications for Star Formation in High Redshift Galaxies
• A large Hα survey at z=2.23, 1.47, 0.84 & 0.40: the 11 Gyr evolution of star-forming galaxies from HiZELS
• The Big Problems in Star Formation: the Star Formation Rate, Stellar Clustering, and the Initial Mass Function
• The HST Key Project on the Extragalactic Distance Scale XIII. The Metallicity Dependence of the Cepheid Distance Scale
• Black Holes on FIRE: Stellar Feedback Limits Early Feeding of Galactic Nuclei
• Dissipation and Extra Light in Galactic Nuclei: IV. Evolution in the Scaling Relations of Spheroids
• The star formation main sequence and stellar mass assembly of galaxies in the Illustris simulation
• (Star)bursts of FIRE: observational signatures of bursty star formation in galaxies
• The COSMOS-WIRCam near-infrared imaging survey: I: BzK selected passive and star forming galaxy candidates at z>1.4
• The Chandra COSMOS Survey: III. Optical and Infrared Identification of X-ray Point Sources
• The FMOS-COSMOS survey of star-forming galaxies at z ~ 1.6. I. Hα-based star formation rates and dust extinction
• The Evolution of the M-sigma Relation
• Star formation at z=1.47 from HiZELS: An Hα+[OII] double-blind study
• Star Formation in Semi-Analytic Galaxy Formation Models with Multiphase Gas
• Modeling the Effects of Star Formation Histories on Halpha and Ultra-Violet Fluxes in Nearby Dwarf Galaxies
• Direct measurements of dust attenuation in z~1.5 star-forming galaxies from 3D-HST: Implications for dust geometry and star formation rates
• HiZELS: a high redshift survey of H-alpha emitters. I: the cosmic star-formation rate and clustering at z=2.23
• Semi-analytic forecasts for JWST - I. UV luminosity functions at z = 4 - 10
• The MOSDEF Survey: Optical AGN Diagnostics at z~2.3
• The Baryon Cycle of Dwarf Galaxies: Dark, Bursty, Gas-Rich Polluters
• The FMOS-COSMOS survey of star-forming galaxies at z~1.6 III. Survey design, performance, and sample characteristics
• Non-parametric Star Formation History Reconstruction with Gaussian Processes I: Counting Major Episodes of Star Formation
• A Model for the Origin of Bursty Star Formation in Galaxies
• The MOSDEF Survey: Dissecting the star-formation rate vs. stellar mass relation using H$\alpha$ and H$\beta$ emission lines at z ~ 2
• MUFASA: Galaxy star formation, gas, and metal properties across cosmic time
• The MOSDEF Survey: Direct Observational Constraints on the Ionizing Photon Production Efficiency, ${\xi }_{\mathrm{ion}}$, at z~2
• The MOSDEF Survey: the Variation of the Dust Attenuation Curve with Metallicity
• The MUSE Hubble Ultra Deep Field Survey XI. Constraining the low-mass end of the stellar mass - star formation rate relation at $z<1$
• The MOSDEF survey: AGN multi-wavelength identification, selection biases and host galaxy properties
• The Bursty Star Formation Histories of Low-mass Galaxies at $0.4<z<1$ Revealed by Star Formation Rates Measured from H$\beta$ and FUV
• The MOSDEF Survey: The First Direct Measurements of the Nebular Dust Attenuation Curve at High Redshift
• The Imprint of Reionization on the Star Formation Histories of Dwarf Galaxies
• H-alpha emission in local galaxies: star formation, time variability and the diffuse ionized gas
• The MOSDEF survey: a census of AGN-driven ionized outflows at $z=1.4-3.8$
• Consequences of bursty star formation on galaxy observables at high redshifts
• Evolution of Intrinsic Scatter in the SFR-Stellar Mass Correlation at 0.5<z<3
• Investigating H$\alpha$, UV, and IR star-formation rate diagnostics for a large sample of z ~ 2 galaxies
• The MOSDEF Survey: The strong agreement between H-alpha and UV-to-FIR star formation rates for z~2 star-forming galaxies
• The Relationship Between Star-formation Activity and Galaxy Structural Properties in CANDELS and a Semi-analytic Model
• Supernova Feedback in Molecular Clouds: Global Evolution and Dynamics
• Star Formation Stochasticity Measured from the Distribution of Burst Indicators
• The Variability of the Star Formation Rate in Galaxies: I. Star Formation Histories Traced by EW(H$\alpha$) and EW(H${\delta }_A$)
• THE MOSDEF SURVEY: The Nature of Mid-Infrared Excess Galaxies and a Comparison of IR and UV Star Formation Tracers at z~2
• Testing the Relationship Between Bursty Star Formation and Size Fluctuations of Local Dwarf Galaxies

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• Exploring the Correlation between $\mathrm{H}\alpha$-to-UV Ratio and Burstiness for Typical Star-forming Galaxies at $z\sim 2$
• Taking a Break at Cosmic Noon: Continuum-selected Low-mass Galaxies Require Long Burst Cycles