EDP Sciences
Free access
Volume 374, Number 2, August I 2001
Page(s) 682 - 690
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20010737

A&A 374, 682-690 (2001)
DOI: 10.1051/0004-6361:20010737

The HI supershell GS061+00+51 and its neighbours

S. Ehlerová1, J. Palous1 and W. K. Huchtmeier2

1  Astronomical Institute, Academy of Sciences of the Czech Republic, BocníII 1401, 141 31 Prague 4, Czech Republic
2  MPIfR, Auf dem Hügel 69, 53121 Bonn, Germany

(Received 27 February 2001/ Accepted 18 May 2001)

We describe HI observations of a $4{\degr} \times 4{\degr}$ field in the Milky Way centered on $l=61{\degr}$, $b=0{\degr}$ made by the Effelsberg radiotelescope. The field contains one previously identified HI supershell, GS061+00+51 (Heiles 1979); apart from it we find several new structures. We also study the HI distribution in the vicinity of four HII regions, S86, S87, S88 and S89. We confirm the existence of the shell GS061+00+51, and we find that it has two smaller neighbours, spherical shells with $R_{\mathrm{sh}} \sim 30 \mathrm{pc}$. We identify at least one more regular shell at vLSR = -18 km s-1; and one blown-out shell at vLSR = -54 km s-1. In two cases we are able to connect HII regions with features in the HI distribution (S86 and S87), in two other cases no connection is found. Apart from quite regular HI shells we see a number of non-coherent objects, which are probably a result of the turbulence in the interstellar medium.

Key words: ISM: bubbles -- ISM: supernova remnants -- ISM: HII regions -- radio lines: ISM

Offprint request: S. Ehlerová, sona@alnitak.ig.cas.cz

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