Peculiar HI cloud near galactic plane Virtual Observatory Resource

Authors
  1. Higgs L.A.
  2. Kerton C.R.
  3. Knee L.B.G.
  4. Published by
    CDS
Abstract

An H I cloud with a double-lobed structure and a radial velocity of +50km/s has been found near l=92{deg}, b=-4{deg} in a low-resolution H I survey carried out at the Dominion Radio Astrophysical Observatory (DRAO). This velocity is forbidden for circular Galactic rotation. Because of its unusual morphology and small variation in radial velocity over the cloud, further observations of the area were made with the DRAO Synthesis Telescope, both in the H I line and in the radio continuum. The cloud has dimensions of about 3.3{deg}x0.5{deg}, and has a morphology somewhat similar to high-velocity H I clouds (HVCs). Several possible associations with other objects are examined in this paper. A variable inverted-spectrum radio continuum source exists near the morphological center of the H I cloud. It is probably a rare example of a gigahertz peaked spectrum (GPS) extragalactic source having a peak above 5GHz. A luminous B star is found close to the peculiar H I cloud, and the cloud is also located near the center of an H I supershell, supposedly located at a distance of about 9kpc. Energetic and other considerations lead to the conclusion that the cloud is probably not related to the HVC phenomenon nor to any of the above objects but is a relic of a nearby (D~1kpc) supernova event, all other evidence of which has now dissipated. Maps of continuum radio emission (at 1420 and 408MHz) in the area around the cloud are presented, as well as lists of continuum radio sources. A few isolated high-velocity knots of H I emission have also been detected in the vicinity of the cloud.

Keywords
  1. molecular-clouds
  2. galaxy-planes
  3. milky-way-galaxy
  4. h-i-line-emission
  5. radial-velocity
Bibliographic source Bibcode
2001AJ....122.3155H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/122/3155
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/122/3155
Document Object Identifer DOI
doi:10.26093/cds/vizier.51223155

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History

2002-07-22T13:50:25Z
Resource record created
2002-07-22T13:50:25Z
Created
2023-04-06T16:50:45Z
Updated

Contact

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CDS support team
Postal Address
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