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Science
Interstellar Matter
IRAS loops
Catalogue of far-infrared loops in the Galaxy |
We present the results of an investigation of the large-scale structure
of the diffuse interstellar medium in the 2nd Galactic Quadrant
(90°≤l≤180°). 145 loops were identified on IRAS-based
far-infrared maps. Our catalogue lists their basic physical properties.
The distribution clearly suggests that there is an efficient process
that can generate loop-like features at high Galactic latitudes.
Distances are provided for 30 loops. We also give an observational
estimate of the volume filling factor of the hot gas in the Local Arm,
4.6%≤f2nd<6.4%.
Related paper:
- Title: Far-infrared loops in the 2nd Galactic Quadrant
- Authors: Kiss, Cs.; Moór, A.; Tóth, L. V.
- Journal: Astronomy and Astrophysics, v.418, p.131-141 (2004)
We investigate the spatial and velocity distribution of atomic hydrogen
associated with the Cepheus Bubble, a giant (~10deg in
angular diameter) dust ring around the Cep OB2 association. HI 21 cm
data, taken from the Leiden/Dwingeloo survey, reveal HI structures in
the [-14,+2] kms-1 velocity range which can be associated
with prominent parts of the dust ring. In the same area the HI maps also
show an expanding shell with a well-defined approaching side at
VLSR=-37 kms-1 and a less well-defined receding
side at VLSR~-4 kms-1. The kinematics and size of
this shell are best modelled by a supernova explosion, occurring in Cep
OB2a at about 1.7 Myrs ago. Since the ages of several parts of the
Cepheus Bubble are considerably higher than the age of the expanding
shell, the supernova probably exploded in a pre-existing cavity, and its
shock front might have interacted with the already existing star forming
regions Sh2-140, IC 1396, and NGC 7129, leading to a new wave of star
formation there.
Related paper:
- Title: Morphology and kinematics of the Cepheus Bubble
- Authors: Ábrahám, P.; Balázs, L. G.; Kun, M.
- Journal: Astronomy and Astrophysics, v.354, p.645-656 (2000)
We identified a large expanding HI shell around the Cas OB5 analyzing Leiden/Dwingeloo HI data. With the help of
objects apparently associated with the bubble, we could estimate a distance of 2.5 kpc and we determined the main
characteristics of the shell. Model calculations have shown that Cas OB5 had the power to form the observed structure
in its neighbourhood.
Related paper:
- Title: Supershell around Cas OB5
- Authors: Moór, A. Cs.; Kiss, Cs.
- Journal: 2nd Workshop of Young Researchers in Astronomy & Astrophysics, Publications of the Astronomy Department of the Eötvös University (PADEU), Vol. 12., ISBN 963 463 557, HU ISSN 0238-2423, p. 97-102.
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