A new large high latitude cone-like far-IR nebula

Details A new large high latitude cone-like far-IR nebula A new large high latitude cone-like far-IR nebula

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...448..213a&link_type=abstract

Astronomy and Astrophysics, Volume 448, Issue 1, March II 2006, pp.213-219

Astronomy and Astrophysics

Astrophysics

Infrared: Ism, Ism: Structure

Scientific paper

We present a new isolated interstellar nebula (RA = 08^h27^m, Dec = +25°54 arcmin (J2000); ℓ = 197.8°, b = +31.6 °) found at 100 μm and 60 μm on IRAS maps. It has dimensions of ~140 arcmin × 70 arcmin 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.

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