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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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Molecular Hydrogen and Global Star Formation Relations in Galaxies

TL;DR: In this paper, the Schmidt-Kennicutt relation between ISM pressure and molecular fraction and the gas surface density was investigated in the presence of low-temperature cooling, and it was shown that the Toomre criterion correctly predicts the onset of star formation in simulated disks.
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Secular Evolution in Disk Galaxies

TL;DR: A review of the evolution of disk galaxies can be found in this paper, which is largely restricted to internally driven processes that can be distinguished from evolution driven by galaxy interactions, and identifies areas where more work is needed.
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Andromeda's dust

TL;DR: In this article, the authors used the Spitzer Space Telescope and Herschel Space Observatory imaging of M31 to construct maps of dust surface density, dust-to-gas ratio, starlight heating intensity, and polycyclic aromatic hydrocarbon (PAH) abundance, out to R ≈ 25 kpc.
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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