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J/AJ/122/3155 Peculiar HI cloud near galactic plane (Higgs+, 2001)
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Beginning of ReadMe :J/AJ/122/3155 Peculiar HI cloud near galactic plane (Higgs+, 2001)
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A peculiar intermediate-velocity hydrogen cloud near the galactic plane.
Higgs L.A., Kerton C.R., Knee L.B.G.
<Astron. J. 122, 3155 (2001)>
=2001AJ....122.3155H
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ADC_Keywords: Molecular clouds ; Galactic plane ; H I data ; Radial velocities
Keywords: Galaxy: kinematics and dynamics - ISM: H I - radio continuum -
radio emission lines
Abstract:
An H I cloud with a double-lobed structure and a radial velocity of
+50km/s has been found near l=92deg, b=-4deg 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 3.3degx0.5deg,
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.