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Open AccessJournal ArticleDOI

Molecular gas in the Andromeda galaxy

TLDR
M 31, the closest large spiral galaxy to our own, is the best object for studying molecular clouds and their relation to the spiral structure as discussed by the authors, and it is also one of the best places where to estimate molecular clouds masses through the Virial Theorem.
Abstract
M 31, the closest large spiral galaxy to our own, is the best object for studying molecular clouds and their relation to the spiral structure. As one of the astronomical objects with the best known distance (0.78 ± 0.02 Mpc), it is also one of the best places where to estimate molecular clouds masses through the Virial Theorem.

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Journal ArticleDOI

The Quest for the Missing Dust. I. Restoring Large-scale Emission in Herschel Maps of Local Group Galaxies

TL;DR: In this paper, a significant amount of emission was missing from uncorrected Herschel data of these galaxies; over 20% in some bands, especially in shorter wavelength bands, making these regions 20-40% bluer than before.
Journal ArticleDOI

Cumulative Oxygen Abundances of Spiral Galaxies

TL;DR: In this article, a framework for determining the overall oxygen abundance of a disk is established by integrating the absolute amounts of hydrogen and oxygen out to large radii, and the cumulative oxygen abundance is shown to approach an asymptotic value.
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Comparative study of gamma-ray emission from molecular clouds and star-forming galaxies

TL;DR: In this paper, the scaling relations of gamma-ray luminosity, SFR, and the gas mass for molecular clouds and star-forming galaxies were compared using a multiple-variable regression analysis.
Journal ArticleDOI

Water Masers in the Andromeda Galaxy: I. A Survey for Water Masers, Ammonia, and Hydrogen Recombination Lines

TL;DR: The results of a Green Bank Telescope survey for water masers, ammonia (1,1) and (2,2), and the H66-alpha recombination line toward 506 luminous compact 24 micron-emitting regions in the Andromeda Galaxy (M31) were reported in this article.
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The HASHTAG Project: The First Submillimeter Images of the Andromeda Galaxy from the Ground

Matthew W. L. Smith, +53 more
TL;DR: In this article, the HARP and SCUBA-2 High Resolution Terahertz Andromeda Galaxy Survey (HASHTAG) was carried out on the James Clerk Maxwell Telescope.
References
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Journal ArticleDOI

A survey of interstellar H I from L-alpha absorption measurements. II

TL;DR: The Copernicus satellite surveyed the spectral region near L alpha to obtain column densities of interstellar HI toward 100 stars as discussed by the authors, and the value of the mean ratio of total neutral hydrogen to color excess was found to equal 5.8 x 10 to the 21st power atoms per (sq cm x mag).
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The Milky Way in Molecular Clouds: A New Complete CO Survey

TL;DR: In this article, a large-scale CO survey of the first and second Galactic quadrants and the nearby molecular cloud complexes in Orion and Taurus, obtained with the CfA 1.2 m telescope, was combined with 31 other surveys obtained over the past two decades with that instrument and a similar telescope on Cerro Tololo in Chile, to produce a new composite CO survey.
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Linear regression in astronomy. II

TL;DR: A wide variety of least-squares linear regression procedures used in observational astronomy, particularly investigations of the cosmic distance scale, are presented and discussed in this article, where a formula for the intercept offset between two parallel data sets, which propagates slope errors from one regression to the other, and a generalization of the Working-Hotelling confidence bands to nonstandard least squares lines.
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Determining structure in molecular clouds

TL;DR: In this paper, an automatic, objective routine for analyzing the clumpy structure in a spectral line position-position-velocity data cube is described, which works by first contouring the data at a multiple of the rms noise of the observations, then searching for peaks of emission which locate the clumps, and then following them down to lower intensities.
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The FCRAO Extragalactic CO Survey. I. The Data

TL;DR: In this article, the authors describe the galaxy sample, present the data, and determine global CO fluxes and radial distributions for the galaxies in the FCRAO Extragalactic CO Survey.
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