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We examine morphology-separated color-mass diagrams to study the quenching ofstar formation in $\sim 100,000$ ($z\sim0$) Sloan Digital Sky Survey (SDSS) and$\sim 20,000$ ($z\sim1$) Cosmic Assembly Near-Infrared Deep ExtragalacticLegacy Survey (CANDELS) galaxies. To classify galaxies morphologically, wedeveloped Galaxy Morphology Network (GaMorNet), a convolutional neural networkthat classifies galaxies according to their bulge-to-total light ratio.GaMorNet does not need a large training set of real data and can be applied todata sets with a range of signal-to-noise ratios and spatial resolutions.GaMorNet's source code as well as the trained models are made public as part ofthis work ( http://www.astro.yale.edu/aghosh/gamornet.html ). We first trainedGaMorNet on simulations of galaxies with a bulge and a disk component and thentransfer learned using $\sim25\%$ of each data set to achieve misclassificationrates of $\lesssim5\%$. The misclassified sample of galaxies is dominated bysmall galaxies with low signal-to-noise ratios. Using the GaMorNetclassifications, we find that bulge- and disk-dominated galaxies have distinctcolor-mass diagrams, in agreement with previous studies. For both SDSS andCANDELS galaxies, disk-dominated galaxies peak in the blue cloud, across abroad range of masses, consistent with the slow exhaustion of star-forming gaswith no rapid quenching. A small population of red disks is found at high mass($\sim14\%$ of disks at $z\sim0$ and $2\%$ of disks at $z \sim 1$). Incontrast, bulge-dominated galaxies are mostly red, with much smaller numbersdown toward the blue cloud, suggesting rapid quenching and fast evolutionacross the green valley. This inferred difference in quenching mechanism is inagreement with previous studies that used other morphology classificationtechniques on much smaller samples at $z\sim0$ and $z\sim1$.

astrophysical journal/the astrophysical journal

Galaxy Morphology Network: A Convolutional Neural Network Used to Study  Morphology and Quenching in $\sim 100,000$ SDSS and $\sim 20,000$ CANDELS  Galaxies