Issue |
A&A
Volume 448, Number 1, March II 2006
|
|
---|---|---|
Page(s) | 213 - 219 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20042440 | |
Published online | 17 February 2006 |
A new large high latitude cone-like far-IR nebula
Institut für Astrophysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck e-mail: [Binil.Aryal;Ronald.Weinberger]@uibk.ac.at
Received:
26
November
2004
Accepted:
4
October
2005
We present a new isolated interstellar nebula (RA =
08, Dec = +25
(J2000);
= 197
8, b = +31
6) found at 100
m and 60
m on IRAS maps. It has dimensions of ~140′
and a cone-like shape, suggesting interaction with ambient matter or external radiation. The nebula contains 2 bright condensations (“nuclei”) and several prominent filaments,
the latter being approximately parallel to each other. We carried
out preliminary studies based on IRAS data and the Palomar
Observatory Sky Survey and found that there are no hints of star
formation in the nebula. The nebula's long axis is almost parallel
to the Galactic plane. A shaping due to the nebula's motion
through the interstellar medium might be not a sufficient reason
in this case. We have discussed this possibility by applying
results of Reynolds number hydrodynamics. During a search for
possible stellar candidates for shaping this nebula we noted a remarkable position of one of the very few nearby (D ≈ 0.36 kpc) pulsars known at about this latitude: PSR B0823+26. This
pulsar is projected at the tip of the nebula and its proper motion
is approaching along the long axis (~180° to the
direction of the cone) of the nebula. The true cause for the
shaping of the nebula, which was coined Skeleton Nebula by us,
however remains unknown.
Key words: infrared: ISM / ISM: structure
© ESO, 2006
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