1999A&A...352..308W -
Astronomy and Astrophysics, volume 352, 308-316 (1999/12-1)
EUV mapping of the local interstellar medium: the Local Chimney revealed?
WELSH B.Y., SFEIR D.M., SIRK M.M. and LALLEMENT R.
Abstract (from CDS):
We discuss the galactic distribution of 450sources detected by the EUVE satellite that have reliable distance estimates. Late-type stars dominate the nearby EUV source distribution, whereas the majority of EUV source detections with distances >100pc are hot white dwarf stars. The galactic distribution of all these sources is non-uniform with number enhancements seen towards the Hyades cluster, in line-of-sight along the β CMa interstellar tunnel and towards high galactic latitudes in both hemispheres. A comparison of the distribution of these EUV sources with that of the neutral absorption boundary of the Local Bubble region derived from the interstellar NaI observations of Sfeir et al. (
1999A&A...346..785S) reveals that vast majority of EUV sources are contained within this neutral boundary. However, at high galactic latitudes 20 extragalactic EUV sources have been detected along lines-of-sight with low neutral column density, and is consistent with the local interstellar cavity being ``open-ended" in the galactic halo. This ``Local Chimney" opens towards two regions of enhanced intensity of the 0.25keV soft X-ray background emission at high galactic latitudes. Although the hot Local Bubble gas is still contained within a cold, neutral interstellar gas boundary in the galactic plane, it has probably expanded into the halo to produce the Local Chimney feature.
Abstract Copyright:
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Journal keyword(s):
ISM: atoms, ions - ISM: clouds - Galaxy: solar neighbourhood
Nomenclature:
NAME LOCAL CHIMNEY
CDS comments:
par. 3 : white dwarf 0620+134 = EUVE J0620+13.4, 0427+741 = EUVE J0427+74.1.
Simbad objects:
14
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