Bibcode
Kemp, S. N.; Bates, B.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 301, Issue 4, pp. 1095-1098.
Fecha de publicación:
12
1998
Número de citas
1
Número de citas referidas
1
Descripción
We have obtained a spectrum of the Na D lines of the Seyfert galaxy Mrk
595 with a signal-to-noise ratio (S/N) of about 30. The importance of
this sightline is that this galaxy lies in a direction close to the
highest column densities of the Cohen high-velocity (HV) stream, and
hence represents the best opportunity of detecting this stream in
interstellar absorption, as previous searches towards stellar targets up
to a distance of 600 pc have not been successful. The HI column density
in the direction of this galaxy implies that the HV gas should be
detectable in absorption in the Na D lines. No such detections are made
(at the 3sigma level) and we consider possible explanations. Hence
previous non-detections towards stars do not necessarily mean that the
HV gas is more distant than the stars, and we emphasize that the
distance of this high-velocity cloud (HVC), which is a key parameter to
the understanding of the nature and origin of this feature, remains
unknown and indeed may be difficult to establish.