CLEAR: The Morphological Evolution of Galaxies in the Green Valley

Abstract

Quiescent galaxies having more compact morphologies than star-forming galaxies has been a consistent result in the field of galaxy evolution. What is not clear is at what point this divergence happens, i.e. when do quiescent galaxies become compact, and how big of a role does the progenitor effect play in this result? Here we aim to model the morphological and star-formation histories of high redshift (0.8 $<$ z $<$ 1.65) massive galaxies (log(M/M$\odot$) $>$ 10.2) with stellar population fits using HST/WFC3 G102 and G141 grism spectra plus photometry from the CLEAR (CANDELS Lyman-alpha Emission at Reionization) survey, constraining the star-formation histories for a sample of $\sim$ 400 massive galaxies using flexible star-formation histories. We develop a novel approach to classifying galaxies by their formation activity in a way that highlights the green valley population, by modeling the specific star-formation rate distributions as a function of redshift and deriving the probability that a galaxy is quiescent (PQ). Using PQ and our flexible star-formation histories we outline the evolutionary paths of our galaxies in relation to stellar mass, Sersic index, $R_{eff}$, and stellar mass surface density. We find that galaxies show no appreciable stellar mass growth after entering the green valley (a net decrease of 4$\%$) while their stellar mass surface densities increase by $\sim$ 0.25 dex. Therefore galaxies are becoming compact during the green valley and this is due to increases in Sersic index and decreases in $R_{eff}$.

arXiv comment17 pages, 10 figures, submitted to ApJ

References in corpus (60)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• On the variation of the Initial Mass Function
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• EAZY: A Fast, Public Photometric Redshift Code
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• Nearly 5000 Distant Early-Type Galaxies in COMBO-17: a Red Sequence and its Evolution since z~1
• 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 Evolution of the Stellar Mass Functions of Star-Forming and Quiescent Galaxies to z = 4 from the COSMOS/UltraVISTA Survey
• Minor mergers and the size evolution of elliptical galaxies
• Detection of quiescent galaxies in a bicolor sequence from z=0-2
• How to Measure Galaxy Star Formation Histories II: Nonparametric Models
• The Relation Between Compact, Quiescent High Redshift Galaxies and Massive Nearby Elliptical Galaxies: Evidence for Hierarchical, Inside-Out Growth
• The Chandra Deep Field-South Survey: 7 Ms Source Catalogs
• The ACS Fornax Cluster Survey. V. Measurement and Recalibration of Surface Brightness Fluctuations and a Precise Value of the Fornax--Virgo Relative Distance
• The NEWFIRM Medium-band Survey: Photometric Catalogs, Redshifts and the Bimodal Color Distribution of Galaxies out to z~3
• Galaxy Stellar Mass Functions from ZFOURGE/CANDELS: An Excess of Low-Mass Galaxies Since z=2 and the Rapid Buildup of Quiescent Galaxies
• The DEEP Groth Strip Survey II. Hubble Space Telescope Structural Parameters of Galaxies in the Groth Strip
• Nebular Continuum and Line Emission in Stellar Population Synthesis Models
• What do we learn from IRAC observations of galaxies at 2 < z < 3.5?
• Environment and self-regulation in galaxy formation
• A Link Between Star Formation Quenching and Inner Stellar Mass Density in SDSS Central Galaxies
• A Spitzer-Selected Galaxy Cluster at z=1.62
• Clusters of Galaxies in the First Half of the Universe from the IRAC Shallow Survey
• 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 High Merger Fraction in the Rich Cluster MS1054-03 at z=0.83: Direct Evidence for Hierarchical Formation of Massive Galaxies
• A Large Population of Massive Compact Post-Starburst Galaxies at z>1: Implications for the Size Evolution and Quenching Mechanism of Quiescent Galaxies
• MOSFIRE Spectroscopy of Quiescent Galaxies at 1.5 < z < 2.5. II - Star Formation Histories and Galaxy Quenching
• Fast, Slow, Early, Late: Quenching Massive Galaxies at z~0.8
• The 2 Ms Chandra Deep Field-North Survey and the 250 ks Extended Chandra Deep Field-South Survey: Improved Point-Source Catalogs
• Effect of local environment and stellar mass on galaxy quenching and morphology at $0.5<z<2.0$
• Surface density effects in quenching: cause or effect?
• Reconstruction of Galaxy Star Formation Histories through SED Fitting: The Dense Basis Approach
• Demographics of Star-forming Galaxies since $z\sim 2.5$. I. The $UVJ$ Diagram in CANDELS
• Galaxy and Mass Assembly (GAMA): Morphological transformation of galaxies across the green valley
• The cosmic evolution of the spatially-resolved star formation rate and stellar mass of the CALIFA survey
• CLEAR: The Gas-Phase Metallicity Gradients of Star-Forming Galaxies at 0.6 < z < 2.6
• A Keck Spectroscopic Survey of MS1054-03 (z=0.83): Forming the Red Sequence
• CLEAR I: Ages and Metallicities of Quiescent Galaxies at $1.0<\mathbf{z}<1.8$ Derived from Deep Hubble Space Telescope Grism Data
• Dissecting the size-mass and ${\Sigma }_1$-mass relations at 1.0 < z < 2.5: galaxy mass profiles and color gradients as a function of spectral shape
• Stellar Metallicities and Elemental Abundance Ratios of z~1.4 Massive Quiescent Galaxies
• CLEAR II: Evidence for Early Formation of the Most Compact Quiescent Galaxies at High Redshift
• Color gradients along the quiescent galaxy sequence: clues to quenching and structural growth
• The colors and sizes of recently quenched galaxies: a result of compact starburst before quenching
• Are star formation rates of galaxies bimodal?
• Reconstructing the Assembly of Massive Galaxies. I: The Importance of the Progenitor Effect in the Observed Properties of Quiescent Galaxies at $z\approx 2$
• AGN Selection Methods Have Profound Impacts on the Distributions of Host Galaxy Properties
• A Calibrated Measurement of the Near-IR Continuum Sky Brightness Using Magellan/FIRE
• The VIMOS Public Extragalactic Redshift Survey (VIPERS). AGN feedback in [NeV] emitters
• Aging of galaxies along the morphological sequence, marked by bulge growth and disk quenching
• HST/WFC3 grism observations of $z\sim 1$ clusters: evidence for evolution in the mass-size relation of quiescent galaxies from poststarburst galaxies
• Galaxy Structure, Stellar Populations, and Star Formation Quenching at 0.6 $\lesssim$ $z$ $\lesssim$ 1.2
• CLEAR: Survey Overview, Data Analysis and Products
• Across the Green Valley with HST grisms: colour evolution, crossing time-scales and the growth of the red sequence at $z=1.0-1.8$
• Evaluating hydrodynamical simulations with green valley galaxies
• Implications of Increased Central Mass Surface Densities for the Quenching of Low-mass Galaxies

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