A massive counter-rotating gas disk in a spiral galaxy
Article Abstract:
The presence of counter-rotating gas in galaxies with little gas remaining from the epoch of galaxy formation has been suggested to result from gas captured from a counter-rotating dwarf galaxy because the galaxy's own gas would rotate with the stars. The spiral galaxy, NGC3626, shows the presence of counter-rotating ionized gas, allowing for the study of the phenomena and evidence suggests the gas capture was recent because it has not yet interacted with the gas already present in the galaxy. The interaction should cause both gases to collapse toward the galaxy's center, an effect not yet evident.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Origin of the magnetic spiral arms in the galaxy NGC6946
Article Abstract:
Fast magnetohydrodynamical (MHD) density waves in the gas of the rotating galactic disk produce spiral magnetic structures that are similar to the optical spiral arms of the galaxy NGC6946. These structures extend into the rotating galactic disk. The slow MHD density waves produce polarized radio emissions similar to those observed in the galaxy's magnetic field. The density waves are responsible for the formation of stars in the galactic field. The various processes in the gases present in the galactic disk also cause the formation of the magnetic field.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Smooth dark spiral arms in the flocculent galaxy NGC2841
Article Abstract:
The flocculent galaxy NGC2841 contains long dark infrared spiral arms which are concentrations of dust and are visible in images taken in the K' band. The scattering of light by dust at shorter wavelengths makes the arms invisible in visual images. Two arms extend 160 degrees from the northeast minor to the north, and two other arms extend in the west and south of the galaxy respectively. The arms are most likely either sheared density clouds or bulge-driven waves as stellar density waves are absent or very weak.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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