An H I absorption survey of M31 and M33 - The mixture of warm and cool phases in the interstellar media of spiral galaxies

J.M. Dickey; E. Brinks

doi:10.1086/172348

An H I absorption survey of M31 and M33 - The mixture of warm and cool phases in the interstellar media of spiral galaxies

J.M. Dickey, E. Brinks

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Abstract

The VLA in A-array is used to survey the nearby spiral galaxies M31 and M33 in the 21-cm line in order to measure absorption by the H I toward background continuum sources. Spectral line cubes with rms noise less than 1.2 mJy are obtained in spectral channels of 2.6 km/s. The warm neutral medium is found to be the dominant form of atomic hydrogen in M31 and M33. This phase is robust to variations in the interstellar environment represented by the differences among these galaxies. Compared with the Milky Way, M31 shows somewhat more cool atomic hydrogen (40 percent relative to 25 percent), whereas M33 shows less (15 percent). This suggests a trend with morphological type, with Sb galaxies exhibiting more cool H I relative to warm, and Sc galaxies, less, a trend similar to that seen by comparing molecular with atomic gas overall.

Original language	English
Pages (from-to)	153-162
Journal	The Astrophysical Journal
Volume	405
Issue number	1
DOIs	https://doi.org/10.1086/172348
Publication status	Published - 1993

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title = "An H I absorption survey of M31 and M33 - The mixture of warm and cool phases in the interstellar media of spiral galaxies",

abstract = "The VLA in A-array is used to survey the nearby spiral galaxies M31 and M33 in the 21-cm line in order to measure absorption by the H I toward background continuum sources. Spectral line cubes with rms noise less than 1.2 mJy are obtained in spectral channels of 2.6 km/s. The warm neutral medium is found to be the dominant form of atomic hydrogen in M31 and M33. This phase is robust to variations in the interstellar environment represented by the differences among these galaxies. Compared with the Milky Way, M31 shows somewhat more cool atomic hydrogen (40 percent relative to 25 percent), whereas M33 shows less (15 percent). This suggests a trend with morphological type, with Sb galaxies exhibiting more cool H I relative to warm, and Sc galaxies, less, a trend similar to that seen by comparing molecular with atomic gas overall.",

author = "J.M. Dickey and E. Brinks",

note = "Original article can be found at: http://adsabs.harvard.edu/abs/ Copyright American Astronomical Society. DOI: 10.1086/172348 [Full text of this article is not available in the UHRA]",

year = "1993",

doi = "10.1086/172348",

language = "English",

volume = "405",

pages = "153--162",

journal = "The Astrophysical Journal",

issn = "0004-637X",

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TY - JOUR

T1 - An H I absorption survey of M31 and M33 - The mixture of warm and cool phases in the interstellar media of spiral galaxies

AU - Dickey, J.M.

AU - Brinks, E.

N1 - Original article can be found at: http://adsabs.harvard.edu/abs/ Copyright American Astronomical Society. DOI: 10.1086/172348 [Full text of this article is not available in the UHRA]

PY - 1993

Y1 - 1993

N2 - The VLA in A-array is used to survey the nearby spiral galaxies M31 and M33 in the 21-cm line in order to measure absorption by the H I toward background continuum sources. Spectral line cubes with rms noise less than 1.2 mJy are obtained in spectral channels of 2.6 km/s. The warm neutral medium is found to be the dominant form of atomic hydrogen in M31 and M33. This phase is robust to variations in the interstellar environment represented by the differences among these galaxies. Compared with the Milky Way, M31 shows somewhat more cool atomic hydrogen (40 percent relative to 25 percent), whereas M33 shows less (15 percent). This suggests a trend with morphological type, with Sb galaxies exhibiting more cool H I relative to warm, and Sc galaxies, less, a trend similar to that seen by comparing molecular with atomic gas overall.

AB - The VLA in A-array is used to survey the nearby spiral galaxies M31 and M33 in the 21-cm line in order to measure absorption by the H I toward background continuum sources. Spectral line cubes with rms noise less than 1.2 mJy are obtained in spectral channels of 2.6 km/s. The warm neutral medium is found to be the dominant form of atomic hydrogen in M31 and M33. This phase is robust to variations in the interstellar environment represented by the differences among these galaxies. Compared with the Milky Way, M31 shows somewhat more cool atomic hydrogen (40 percent relative to 25 percent), whereas M33 shows less (15 percent). This suggests a trend with morphological type, with Sb galaxies exhibiting more cool H I relative to warm, and Sc galaxies, less, a trend similar to that seen by comparing molecular with atomic gas overall.

U2 - 10.1086/172348

DO - 10.1086/172348

M3 - Article

SN - 0004-637X

VL - 405

SP - 153

EP - 162

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

An H I absorption survey of M31 and M33 - The mixture of warm and cool phases in the interstellar media of spiral galaxies

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