Molecular gas in the Andromeda galaxy
Ch. Nieten,N. Neininger,N. Neininger,M. Guelin,H. Ungerechts,R. Lucas,Elly M. Berkhuijsen,Rainer Beck,Richard Wielebinski +8 more
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.read more
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Measuring interstellar magnetic fields by radio synchrotron emission
TL;DR: In the Milky Way, diffuse polarized radio emission and Faraday rotation of the polarized emission from pulsars and background sources show many small-scale and large-scale magnetic features, but the overall field structure in our Galaxy is still under debate as discussed by the authors.
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A lack of constraints on the cold opaque H i mass: H i spectra in M31 and M33 prefer multicomponent models over a single cold opaque component
Eric W. Koch,Eric W. Koch,Erik Rosolowsky,Adam K. Leroy,Jérémy Chastenet,I-Da Chiang,Julianne J. Dalcanton,Amanda A. Kepley,Karin Sandstrom,Andreas Schruba,Snežana Stanimirović,Dyas Utomo,Dyas Utomo,Thomas G. Williams +13 more
TL;DR: In this paper, the authors used deep, high spectral resolution HI VLA observations of M31 and M33 to test if these top-hat profiles are instead superpositions of multiple HI components along the line-of-sight.
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CO observations and investigation of triggered star formation toward the n10 infrared bubble and surroundings
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Unresolved X‐ray emission in M31 and constraints on progenitors of classical novae
Á. Bogdán,Marat Gilfanov +1 more
TL;DR: In this article, the authors investigated unresolved X-ray emission from M31 based on an extensive set of archival XMM-Newton and Chandra data and showed that extended emission, found previously in the bulge and thought to be associated with a large number of faint compact sources, extends to the disc of the galaxy with similar Xray to K-band luminosity ratio.
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Water Masers in the Andromeda Galaxy. II. Where Do Masers Arise
Nikta Amiri,Jeremy Darling +1 more
TL;DR: In this article, a comparative multi-wavelength analysis of water maser-emitting regions and non-maser-emiting luminous 24 micron star-forming regions in the Andromeda Galaxy (M31) is presented.
References
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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
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Linear regression in astronomy. II
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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
Judith S. Young,Shuding Xie,Linda J. Tacconi,Pat Knezek,Paul Viscuso,Lowell E. Tacconi-Garman,Nick Scoville,Steve Schneider,F. Peter Schloerb,S. D. Lord,Amy Lesser,Jeff Kenney,Y. L. Huang,Nick Devereux,Mark J. Claussen,James Case,John M. Carpenter,Mike Berry,Lori E. Allen +18 more
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.