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Astron. Astrophys. 324, 1165-1169 (1997)

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The "Criss-Cross Nebula": an interaction of the Orion-Eridanus Bubble with a small interstellar cloud

C. Zanin 1, 2 and R. Weinberger 1

1 Institut für Astronomie der Leopold-Franzens-Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria (http://astro.uibk.ac.at)
2 Dipartimento di Astronomia, Universitá di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy

Received 11 July 1996 / Accepted 16 December 1996

Abstract

A new, small (6 [FORMULA]) filamentary emission nebula of very low surface brightness ([FORMULA]) is found to be projected towards the center of a huge expanding (40 km s-1) H I shell (Brown et al. 1995) surrounding the Orion-Eridanus Bubble. Moderate quality spectra taken by us show low-excitation species but allow us to estimate the electron density ([FORMULA] 102 cm-3). The spectra point to an excitation by a shock of low velocity ([FORMULA] 40 km s-1). No dust emission (IRAS) is seen at the position of our object, which could well be an outlying clump of material associated with the L1569 dust cloud at a distance of about 130 [FORMULA] 20 pc, and which appears to be at the front side of the Bubble. We believe that our "Criss-Cross Nebula", dubbed so due to its specific morphology, might represent a very small interstellar dust cloud that is just in the process of destruction by the blast wave of a supernova that gave rise to the Orion-Eridanus Bubble and to some of its characteristics like the Eridanus soft X-ray enhancement. Known examples of clouds overrun by blast waves are exceedingly rare and a more detailed study of this new nebula is therefore highly recommended.

Key words: ISM: supernova remnants – ISM: bubbles – ISM: individual: Orion-Eridanus Bubble

Send offprint requests to: C. Zanin; caterina.zanin@uibk.ac.at

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998

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