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21-cm line studies of spiral galaxies. I - Observations of the galaxies NGC 5033, 3198, 5055, 2841, and 7331. II - The distribution and kinematics of neutral hydrogen in spiral galaxies of various morphological types
Abstract
We have mapped the galaxies NGC 5033, 3198, 5055, 2841, and 7331 in the 21-cm line with angular resolutions such that the ratio radius/beam size is of order 5-10. For four of the five galaxies we find that both the H I distribution and the velocity field cannot be described by the simple picture of a spiral having an axisymmetric disk in differential rotation. For those four galaxies we show that the main deviations from circular motion can be described by a warping of the plane at large radii. The determination of the mass distributions for these galaxies is severely compromised by this. For all galaxies we find asymmetries in the H I distribution, and for most of them there are H I clouds in the outer parts which do not coincide with optical features. NGC 5055 and NGC 2841 have H I disks extending 2 and 2.5 times as far as the Holmberg radius. NGC 3198, NGC 2841, and NGC 7331 have a depression in the H I distribution in the central parts.
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Cited by
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Radial Acceleration Relation in Rotationally Supported Galaxies
McGaugh, S. S., Lelli, F., & Schombert, J. M. (2016) · Physical Review Letters · doi:10.1103/physrevlett.117.201101 · Cited by 665
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A constant dark matter halo surface density in galaxies
Donato, F., Gentile, G., Salucci, P., Frigerio Martins, C., Wilkinson, M. I., Gilmore, G., Grebel, E. K., Koch, A., & Wyse, R. (2009) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2009.15004.x · Cited by 403
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Metadata
- Authors
- Bosma, A.
- Venue
- The Astronomical Journal
- Publisher
- American Astronomical Society
- Published
- 1981-12
- Volume
- 86
- Pages
- 1791
- ISSN
- 0004-6256 (ISSN-L)
- OpenAlex
- W2079883753
- Cited by
- 363
- References
- 0
- FWCI
- 5.98
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: 21-cm line studies of spiral galaxies. I - Observations of the galaxies NGC 5033, 3198, 5055, 2841, and 7331. II - The distribution and kinematics of neutral hydrogen in spiral galaxies of various morphological types. https://app.cochat.ai/papers/10.1086/113062
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- Bosma, A. (1981). 21-cm line studies of spiral galaxies. I - Observations of the galaxies NGC 5033, 3198, 5055, 2841, and 7331. II - The distribution and kinematics of neutral hydrogen in spiral galaxies of various morphological types. The Astronomical Journal. https://doi.org/10.1086/113062
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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