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Featured researches published by Thomas Mooney.


The Astrophysical Journal | 2013

Resolved Giant Molecular Clouds in Nearby Spiral Galaxies: Insights from the CANON CO (1-0) Survey

Jennifer Donovan Meyer; Jin Koda; Rieko Momose; Thomas Mooney; Fumi Egusa; Misty Carty; Robert C. Kennicutt; Nario Kuno; David Rebolledo; Tsuyoshi Sawada; N. Z. Scoville; Tony Wong

We resolve 182 individual giant molecular clouds (GMCs) larger than 2.5 × 10^5 M ☉ in the inner disks of 5 large nearby spiral galaxies (NGC 2403, NGC 3031, NGC 4736, NGC 4826, and NGC 6946) to create the largest such sample of extragalactic GMCs within galaxies analogous to the Milky Way. Using a conservatively chosen sample of GMCs most likely to adhere to the virial assumption, we measure cloud sizes, velocity dispersions, and ^(12)CO (J = 1-0) luminosities and calculate cloud virial masses. The average conversion factor from CO flux to H_2 mass (or X_(CO)) for each galaxy is 1-2 × 10^(20) cm^(–2) (K km s^(–1))^(–1), all within a factor of two of the Milky Way disk value (~2 × 10^(20) cm^(–2) (K km s^(–1))^(–1)). We find GMCs to be generally consistent within our errors between the galaxies and with Milky Way disk GMCs; the intrinsic scatter between clouds is of order a factor of two. Consistent with previous studies in the Local Group, we find a linear relationship between cloud virial mass and CO luminosity, supporting the assumption that the clouds in this GMC sample are gravitationally bound. We do not detect a significant population of GMCs with elevated velocity dispersions for their sizes, as has been detected in the Galactic center. Though the range of metallicities probed in this study is narrow, the average conversion factors of these galaxies will serve to anchor the high metallicity end of metallicity-X_(CO) trends measured using conversion factors in resolved clouds; this has been previously possible primarily with Milky Way measurements.


The Astrophysical Journal | 2012

Resolved Measurements of X_(CO) in NGC 6946

Jennifer Donovan Meyer; Jin Koda; Rieko Momose; Masayuki Fukuhara; Thomas Mooney; Sarah Towers; Fumi Egusa; Robert C. Kennicutt; Nario Kuno; Misty Carty; Tsuyoshi Sawada; N. Z. Scoville

We present the largest sample to date of giant molecular clouds (GMCs) in a substantial spiral galaxy other than the Milky Way. We map the distribution of molecular gas with high resolution and image fidelity within the central 5 kpc of the spiral galaxy NGC 6946 in the ^(12)CO (J = 1-0) transition. By combining observations from the Nobeyama Radio Observatory 45 m single dish telescope and the Combined Array for Research in Millimeter Astronomy interferometer, we are able to obtain high image fidelity and accurate measurements of L_CO compared with previous purely interferometric studies. We resolve individual GMCs, measure their luminosities and virial masses, and derive X CO—the conversion factor from CO measurements to H2 masses—within individual clouds. On average, we find that X_CO = 1.2 × 10^(20) cm^(–2) (K km s^(–1))^(–1), which is consistent within our uncertainties with previously derived Galactic values as well as the value we derive for Galactic GMCs above our mass sensitivity limit. The properties of our GMCs are largely consistent with the trends observed for molecular clouds detected in the Milky Way disk, with the exception of six clouds detected within ~400 pc of the center of NGC 6946, which exhibit larger velocity dispersions for a given size and luminosity, as has also been observed at the Galactic center.


Geophysical Research Letters | 2006

Rise and decline of active chlorine in the stratosphere

P. M. Solomon; James Barrett; Thomas Mooney; Brian J. Connor; Alan Parrish; David E. Siskind


Journal of Geophysical Research | 2007

Comparison of ClO measurements from the Aura Microwave Limb Sounder to ground-based microwave measurements at Scott Base, Antarctica, in spring 2005

Brian J. Connor; Thomas Mooney; James Barrett; P. M. Solomon; Alan Parrish; Michelle L. Santee


Journal of Geophysical Research | 2011

Ground‐based measurements of ClO from Mauna Kea and intercomparisons with Aura and UARS MLS

Gerald E. Nedoluha; Brian J. Connor; James Barrett; Thomas Mooney; Alan Parrish; I. S. Boyd; Jonathan E. Wrotny; R. Michael Gomez; Jin Koda; Michelle L. Santee; L. Froidevaux


Atmospheric Chemistry and Physics | 2010

Retrievals of chlorine chemistry kinetic parameters from Antarctic ClO microwave radiometer measurements

Stefanie Kremser; Robyn Schofield; G. E. Bodeker; Brian J. Connor; Markus Rex; J. Barret; Thomas Mooney; R. J. Salawitch; T. Canty; K. Frieler; M. P. Chipperfield; Ulrike Langematz; W. Feng


Atmospheric Chemistry and Physics | 2016

20 years of ClO measurements in the Antarctic lower stratosphere

Gerald E. Nedoluha; B. Connor; Thomas Mooney; James Barrett; Alan Parrish; R. Michael Gomez; Ian Boyd; Douglas R. Allen; Michael Kotkamp; Stefanie Kremser; Terry Deshler; Paul A. Newman; Michelle L. Santee


Atmospheric Chemistry and Physics | 2012

Re-analysis of ground-based microwave ClO measurements from Mauna Kea, 1992 to early 2012

B. Connor; Thomas Mooney; Gerald E. Nedoluha; James Barrett; Alan Parrish; Jin Koda; Michelle L. Santee; R. M. Gomez


Open-File Report | 2007

Observations of chlorine monoxide over Scott Base, Antarctica, during the ozone hole, 1996-2005

Brian J. Connor; James Barrett; Thomas Mooney; Alan Parrish


The Astrophysical Journal | 2012

RESOLVED MEASUREMENTS OFXCOIN NGC 6946

Jennifer Donovan Meyer; Jin Koda; Rieko Momose; Masayuki Fukuhara; Thomas Mooney; Sarah Towers; Fumi Egusa; Robert C. Kennicutt; Nario Kuno; Misty Carty; Tsuyoshi Sawada; N. Z. Scoville

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Brian J. Connor

National Institute of Water and Atmospheric Research

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Alan Parrish

University of Massachusetts Amherst

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Jin Koda

California Institute of Technology

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Michelle L. Santee

California Institute of Technology

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Gerald E. Nedoluha

United States Naval Research Laboratory

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N. Z. Scoville

California Institute of Technology

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Fumi Egusa

Japan Aerospace Exploration Agency

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