Radio and optical observations of intermediate velocity gas towards the M15 region

Details Radio and optical observations of intermediate velocity gas towards the M15 region Radio and optical observations of intermediate velocity gas towards the M15 region

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997iraj...24...39k&link_type=abstract

Irish Astronomical Journal, 1997, 24(1), 39

Astronomy and Astrophysics

Astronomy

Scientific paper

Preliminary results are presented of radio lambda 21 cm H I mapping and optical (Ca II K, Na D, K I) observations of intermediate velocity gas towards the M15 sightline. A column density map is constructed from an extensive (2.2 deg. by 2.8 deg.) grid of radio observations made with the Lovell radio telescope which reveals the `clumpy' nature of the gas and suggests further unresolved structure. A velocity gradient of ~30 km/s is apparent across part of the field, possibly due to rotation of the cloud. The IVC is detected in Ca II K, Na D and K I optical absorption lines, these detections are unusually strong and possibly indicate that the gas is highly shocked. Comparison with the gas of the IVC associated with the nearby star HD 203664 is made and it is suggested that the two IVCs are in fact part of the same structure.

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