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The CO-to-H2 Conversion Factor
CO line emission represents the most accessible and widely used tracer of the molecular interstellar medium. This renders the translation of observed CO intensity into total H2 gas mass critical to…
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THE STAR FORMATION EFFICIENCY IN NEARBY GALAXIES: MEASURING WHERE GAS FORMS STARS EFFECTIVELY
We measure the star formation efficiency (SFE), the star formation rate (SFR) per unit of gas, in 23 nearby galaxies and compare it with expectations from proposed star formation laws and thresholds.…
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THE STAR FORMATION LAW IN NEARBY GALAXIES ON SUB-KPC SCALES
We present a comprehensive analysis of the relationship between star formation rate surface density, ΣSFR, and gas surface density, Σgas, at sub-kpc resolution in a sample of 18 nearby galaxies. We…
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THINGS: THE H i NEARBY GALAXY SURVEY
We present “The H i Nearby Galaxy Survey (THINGS),” a high spectral (⩽5.2 km s−1) and spatial (∼6″) resolution survey of H i emission in 34 nearby galaxies obtained using the NRAO Very Large Array…
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THE CO-TO-H2 CONVERSION FACTOR FROM INFRARED DUST EMISSION ACROSS THE LOCAL GROUP
We estimate the conversion factor relating CO emission to H2 mass, αCO, in five Local Group galaxies that span approximately an order of magnitude in metallicity—M 31, M 33, the Large Magellanic…
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HERACLES: THE HERA CO LINE EXTRAGALACTIC SURVEY
We present the Heterodyne Receiver Array CO Line Extragalactic Survey, an atlas of CO emission from 18 nearby galaxies that are also part of The H i Nearby Galaxy Survey and the Spitzer Infrared…
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MOLECULAR GAS AND STAR FORMATION IN NEARBY DISK GALAXIES
We compare molecular gas traced by 12CO (2–1) maps from the HERACLES survey, with tracers of the recent star formation rate (SFR) across 30 nearby disk galaxies. We demonstrate a first-order linear…
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A CONSTANT MOLECULAR GAS DEPLETION TIME IN NEARBY DISK GALAXIES
We combine new sensitive, wide-field CO data from the HERACLES survey with ultraviolet and infrared data from GALEX and Spitzer to compare the surface densities of H2, ΣH2, and the recent star…
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The Resolved Properties of Extragalactic Giant Molecular Clouds
We use high spatial resolution observations of CO to systematically measure the resolved size-line width, luminosity-line width, luminosity-size, and mass-luminosity relations of GMCs in a variety of…
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THE CO-TO-H2 CONVERSION FACTOR AND DUST-TO-GAS RATIO ON KILOPARSEC SCALES IN NEARBY GALAXIES
We present ∼kiloparsec spatial resolution maps of the CO-to-H2 conversion factor (αCO) and dust-to-gas ratio (DGR) in 26 nearby, star-forming galaxies. We have simultaneously solved for αCO and the…
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