Studies of H I self-absorption in the Riegel & Crutcher cold cloud

Details Studies of H I self-absorption in the Riegel & Crutcher cold cloud Studies of H I self-absorption in the Riegel & Crutcher cold cloud

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..449m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 2, pp. 449-460.

Astronomy and Astrophysics

Astronomy

15

Ism, Atoms-Ism, Clouds-Ism, Kinematics And Dynamics-Ism, Structure-Radio Lines, Ism.

Scientific paper

H I profiles of high velocity-resolution are presented for the range of galactic latitude b=b=-6 deg.2 to +8 deg.9 (at intervals of 0 deg.2) at longitude L=9 deg.87. The Riegel & Crutcher cold cloud is detected in self-absorption between b=-4 deg.2 and +8 deg, which defines the latitude extent of the cloud in absorption at this longitude; outside this latitude range the H I is observed in emission at a similar velocity. The velocity structure and H I column densities are derived for the cold cloud. A peak H I column density of ~=2.6x10^20 cm^-2is measured for a small region of angular extent ~=0 deg.2 close to the plane; for an assumed distance of 125 pc this corresponds to ~=2 pc, whilst the latitude extent of the cloud is ~=30 pc. The observations reveal a nearby, extensive structure of diffuse gas which, below the plane, is receding with a velocity (LSR) ~=6 km s^-1. Within the cold cloud region the velocity structure becomes more complex, and above the plane the velocity is reduced to ~=3 km s^-1. Some properties of the cold cloud are examined by combining the H I observations with optical and UV spectral data from the literature, which indicate that the cloud is dense and thin in extent. The observations support earlier suggestions of an association between the cold cloud and the local molecular cloud complexes which define the ridge reported by Dame et al. as well as with diffuse H I gas observed in emission further from the plane at similar velocity.

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